Results (115)

Sort by:

Select all Select all

Page 1

Reifen – Fahrwerk – Fahrbahn

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2398 2022

Results in this title

V. Yordanov, L. Eckstein Continuous Estimation of the Local Friction Value Potential based on Tyre Acoustic Data S. 83-96

„… Continuous Estimation of the Local Friction Value Potential based on Tyre Acoustic Data Ventseslav …” „… systems, at any driving situation, is the accurate and continuous monitoring of the local fric-tion value …” „… between the tyre sound pressure and the local friction value poten-tial are analysed based on power …”

Titelei/Inhaltsverzeichnis S. I-VIII

„… ReifenentwicklungContinuous Estimation of the Local Friction Value Potential based on Tyre Acoustic Data . . . . .83V …”

doi.org/10.51202/9783181023983

Partial access

Select for citation download

International Conference on Gears 2017

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2294 2017

Results in this title

J. Thomas, C. Wirth Determination and improvement of bevel gear efficiency by means of loaded TCA S. 707-718

„… local sliding velocities and local normal forces can be calculated and as soon as local friction …” „… coefficients are known (see following chapter), local friction forces as well. Finally “LokAna” calculates for …” „… shows the formula and its influence parameters. Eq. 10 where i [-] is the local friction …”

M. Oehler, B. Magyar, B. Sauer A new standardizable calculation method to predict the efficiency of worm gear drives S. 363-372

„… friction follows, which corresponds to the local friction coefficient between the gears. A more precise …” „… incoming coefficient of friction comes down to a limit value. This approach is outlined in Figure 6 and …” „… gearing can be investigated in a variety of ways. The target variables are, among other things, the local …”

L. Geng, N. Mimi, L. Lan, Z. Ying, W. Liyan Mesh stiffness of cylindrical gear including tooth surface – Friction based on FEA method S. 807-814

„… be seen that tooth friction and oil film can decrease the value of mesh stiffness. a) 0.0 0.2 …” „… Mesh Stiffness of Cylindrical Gear Including Tooth Surface Friction Based on FEA Method Liu …” „… Controls, Northwestern Polytechnical University, Xi’an, China Abstract The tooth friction and oil film …”

N. Sagraloff, M. Hein, T. Tobie, K. Stahl Practical use of micropitting test results according to FVA 54/7 for calculation of micropitting load capacity acc. to ISO/TR 15144-1 S. 143-152

„… pitting damages. Calculation models for estimating the local material removal as a function of the …” „… determinate the local risk of micropitting. Based on this calculation model, optimal tooth flank …” „… ). This SKS-value is defined as the load stage, in which the defined failure criterion (profile form …”

J. Cathelin, R. Janssen Material data for advanced plastic gear simulation S. 1553-1564

„… distance correction Friction coefficient [-] Gear temperature Wear coefficient [mm3/N.m] Flank wear …” „… , the yield stress value should not be exceeded at the gear tooth root because permanent deformation of …” „… the teeth can occur, creating local contact interferences, which can lead to early failure …”

C. Brecher, C. Löpenhaus, F. Goergen, D. Mevissen Crack propagation analysis of pitting damages of high-strength material systems in gear applications S. 281-292

„… expected at a local exceedance of the material stress state of the value one. Thus, the current local …” „… detailed analysis of pitting characteristics and on the comparison with local stress components …” „… local stress components extends the knowledge of contact fatigue progression and provides a basis for …”

S. Stoyanov, V. Dobrev, A. Dobreva Investigating dynamic behavior of planetary gear trains through the systematic approach S. 197-208

„… mesh the contact lines and surfaces with a local step, which has a small value of the seed size. This …” „… and the same part – global and local. This means that the designer can mesh the entire part with a …” „… global step, which has a great value of the seed step. Together with this global step, the designer can …”

T. Frech, C. Löpenhaus, F. Klocke Influence of the contact conditions in cold rolling on the density profile of powder metallurgical (PM) gears S. 1265-1276

„… , therefore, the local mechanical properties of PM gears. The process parameters infeed, equivalent contact …” „… to increase their local density and, therefore, the load-carrying capacity [2]. PM gears are …” „… stress states on the material deformation [4, 5, 6]. Since friction does not influence the normal …”

D. Krüger, E. Leidich, I. Römhild, R. Heß, H. Linke Geometry, pitting and tooth root capacity of asymmetric gears S. 751-768

„… stress, the coefficient of friction, the direction and magnitude of sliding speed as well as the effect …” „… loaded at the highest point of single tooth contact and the friction is neglected. The maximum of the …” „… tooth root thickness and the bending arm. The calculation of the local maximum tensile stress in the …”

C. Brecher, C. Löpenhaus, R. Greschert Influence of the grinding process on the formation of boundary layers on gears S. 1427-1438

„… economical design of gears. 1. Introduction Gear transmissions are usually run under mixed friction, i.e …” „… arithmetic mean is calculated as representative value. The measurement parameters are chosen in accordance …” „… 0.21 0.20 Ra value increased Specific Material Removal Rate Q‘w = ae·vf [mm³/mm·s] Axial feed rate vf …”

J. J. Liou, S. Rakuff The development of worm drives S. 503-516

„… , local tooth friction and oil churning have to be obtained through the corresponding tribological …” „… ; therefore, the load capacity for worm drives is relatively limited and friction greatly affects the …” „… in much lower friction forces that cannot be found in other metal combinations. It also results in …”

B. Černe, D. Zorko, J. Duhovnik Semi-analytical method for the prediction of the flank temperatures of polymer gears during running S. 1611-1624

„… meshing cycle begins. The flash temperature is on the other hand the local temperature rise beneath the …” „… geometry parameters Parameter Symbol [unit] Value Transmission i [/] 1 Module m [mm] 1 Number of teeth …” „… value). We considered here two polymer materials, i.e. POM and PA66, where in correlation to the tests …”

R. Meissner, M. Liewald, T. Benkert, M. Hiller, W. Volk Multi-component gearwheels and their manufacturing processes S. 1299-1306

„… contact describes the tangential behavior using a friction value of 0.1. There are two boundary …” „… from high strength steel supports the high local loads mentioned above and a lightweight wheel body …” „… positive values would increase this value [3]. Further investigations on the influence of clean shear …”

M. Kanters, B. van Wissen, R. Nickel Relevant tribological testing method for high performance plastic gears S. 1507-1518

„… past few years towards a more specialized, higher value-added businesses in Automotive, Electrical and …” „… sliding wear. To study specific tribological properties, wear and friction measurements are performed on …” „… friction behavior in relevant plasticplastic material pairs. This showed that the ranking of different …”

S.-J. Tsai, L.-C. Chang, C.-H. Huang Design of cycloid planetary gear drives with tooth number difference of two – a comparative study on contact characteristics and load analysis S. 61-74

„… , 3] and also the complete tooth contact considering the bearing stiffness and the friction [8]. The …” „… . Table 3: Essential gearing data for numerical analysis Items / symbols value remarks Pitch circle …” „… local extremum on the tip. The pin radius has almost no influences (Figure 8). The eccentricity e …”

doi.org/10.51202/9783181022948

Partial access

Select for citation download

International Conference on Gears 2022

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2389 2022

Results in this title

A. Gebhard, W. Kassem, M. Oehler Cylinder-on-ring model wear tests as an input data source for the simulation of friction and wear of plastic gears S. 1133-1148

„… value for the coefficient of friction is integrated according to the local conditions in the tooth …” „… computational grid. With the local solid friction force and the local friction distance , the local wear volume …” „… parameter sets the range of individual friction coefficients was at least 40% of the mean value of the …”

K. Daubach, M. Oehler, B. Sauer Wear simulation of worm gears based on an energetic approach S. 329-342

„… tribological calculation to determine the local solid tooth friction and wear. The calculation is iterated with …” „… asperities are separated from each other by a lubricant film (fluid friction). Depending on the local …” „… tribological conditions, boundary or fluid friction predominates at one point. For a local wear calculation …”

B. van Wissen, M. Kanters, F. Mitsuzuka, K. Iwanaga, M. Meuwissen, A. Hasanovic Predicting static and fatigue performance of fiber reinforced plastic gears S. 1083-1098

„… performed within a range of environmental temperatures. Due to friction the local tooth temperature …” „… analysis, including the local fiber orientation in combination with the intrinsic material behavior, is …” „… composition, excellent wear and friction properties and retains its mechanical properties for a long period of …”

P. Rodel, R. Spieler, M. Indenbirken, T. Nuisl Holistic friction optimization of transmissions – a significant contribution for sustainability S. 731-744

„… Holistic friction optimization of transmissions A significant contribution for sustainability …” „… are faced with new challenges. The topic friction optimization gains higher importance during …” „… required. The only means to achieve cost and time efficient holistic friction optimization is the usage of …”

A. Eric, D. Olveda, T. Froschmeier, V. Schulze Local pitting fatigue concept with EHL simulation for case hardened gears in electrical drives S. 133-144

„… Local Pitting Fatigue Concept with EHL Simulation for Case Hardened Gears in Electrical Drives A …” „… experience and experiments. Because of this, the authors developed a local fatigue concept for the pitting …” „… evaluation of case hardened gears which compares the local stresses in the gear subsurface with the local …”

B. Reetz, T. Munch, W. Kappeler Challenges for lead-free brass alloys in worm gears S. 1467-1488

„… variation of the friction value on the tooth flank surface. The highest friction values given in Fig. 3 …” „… (castability, hot workability, machinability). On the other hand, they need to function under wear, friction …” „… to increasing wear under high loadings. This wear is further driven by the generation of friction …”

P. H. O. Teixeira, J. Brimmers, T. Bergs Consideration of micro-interaction in the modeling of generating gear grinding processes S. 1517-1528

„… grain will contain a local zero coordinate point, which is based on the position of grain within the …” „… considered. The grain positioning is performed based on the information of each individual grain local zero …” „… . In the diagram, it is possible to see that each grain has a different average value of cross-section …”

P. Tenberge, J. Vorgerd, L. Gondecki 2-disc tribometer for various tests on sliding/rolling contacts with tribological loads such as in tooth flank contacts S. 145-156

„… tribometer, all relevant load components can be reproduced in their local and timely courses very …” „… , the local power losses and energy inputs lead to complex, mutually interacting wear and fatigue …” „… mechanisms [2 ... 5], as shown in Fig. 2. Thin lubricating films reduce the friction and, by the influence of …”

N. Tros, J. Brimmers, T. Bergs Approach for multiscale modeling the thermomechanical tool load in gear hobbing S. 1489-1502

„… based on local uncut chip geometries. The result is a multiscale model for describing the …” „… . It can therefore be assumed that the material model is also valid for the present case. The friction …” „… at the tool-chip interface was described by the COULOUMB friction law at a constant coefficient of …”

K. Stahl, T. Tobie, C. M. Illenberger Standardized methods of load capacity calculation of plastic gears S. 1173-1180

„… gear. Grease lubrication is one possibility to reduce friction in the gear contact and thus minimize …” „… friction losses in order to increase the possible drive power. Operation under oil-lubricated conditions is …” „… by means of lower friction losses due to lubrication but heat is also removed from the gear contact …”

A. Baumann, B. Bertsche Coefficient of friction behavior of gear oils and significance for the meshing process of spur gears S. 745-762

„… Coefficient of friction behavior of gear oils and significance for the meshing process of spur …” „… procedure for determining the coefficient of friction is used in the following to enable a further …” „… teeth, rolling friction occurs in the gear pair meshing along the line of action due to the variation in …”

W. Wagner, S. Schumann, B. Schlecht Enhanced loaded tooth contact analysis of hypoid gears within a multi-body-system simulation S. 357-370

„… contact and therefore the reaction forces under consideration of friction. This leads to a simplification …” „… the local load distribution on the contact flank based on the relative position of pinion and gear as …” „… distribution = ( ) from the local penetrations = ( ) , the ( × ) compliance matrix = ( ) , is required. This …”

P. Mahendra Rao, S. Foletti, L. Bonaiti, C. Gorla, S. Beretta, F. Concli Mode III threshold under rolling contact fatigue and development of a test gearbox for planet gears S. 499-510

„… the results with the full-scale test articles of the experimental campaign. Friction has been …” „… analysis has been performed in a 2D plain strain non-linear condition (CPE8), with local and global seed …” „… instantaneous hydrostatic component of the stress tensor; and ? ? is the instantaneous value of the Tresca …”

J. Koenig, D. Kehle, K.-P. Heinzle Investigation of the failure mechanisms of plastic materials with and without fiber reinforcement S. 1269-1280

„… calculated the local temperature increase from a friction and deformation part, and according to Hachmann and …” „… that, in the case of oil-lubricated gearings, friction-reducing additives such as PTFE and graphite …” „… friction-reducing additives such as PTFE in PA66 lead to reduced frictional power and an associated lower tooth …”

K. J. Winkler, T. Tobie, K. Stahl Influence of grinding zones on the tooth root bending strength of case carburized cylindrical gears S. 287-304

„… increasing impact depending on the local geometry of a grinding notch, the following material parameters can …” „… influencing the tooth root bending strength. Due to micro-notch effects, the surface roughness leads to local …” „… . Table 1: Geometry data and geometry draft of the test gear Description Symbol Unit Value Test gear …”

L. Hildebrand, F. Dangl, M. Sedlmair, T. Lohner, K. Stahl CFD analysis on the oil flow of a gear stage with guide plate S. 677-694

„… engagement of gears. The local remeshing method is used, whereby the mesh is locally renewed when a certain …” „… with a mean acceleration value of a = 40 m/s² was used. Hereby the numerical stability of the …” „… vt = 10 m/s the same acceleration value of the previous simulation (vt = 7 m/s) was used, resulting …”

B. Legrady, M. Taesch, G. Tschirschnitz, C. F. Mieth Prediction of churning losses in an industrial gear box with spiral bevel gears using the smoothed particle hydrodynamic method S. 651-664

„… capable of evaluating the local churning loss of each component is developed. Thereby, the pinion with its …” „… is required to decrease friction between the contacting gears and to absorb the dissipated heat from …” „… expressions leads to a local formulation of the power losses by means of viscous and pressure induced …”

H.-J. Dennig, L. Zumofen, A. Kirchheim, S. Winterberg, D. Stierli Increasing the safety against scuffing of additive manufactured gear wheels by internal cooling channels S. 1345-1364

„… the following article. The tooth flank is primarily exposed to pressure and friction with simultaneous …” „… result of the increased stress, local temperature increases occur, which leads to the lubricant film …” „… test gears for the FZG scuffing test Dimension Symbol Numerical Value Unit Centre distance a 91.5 mm …”

doi.org/10.51202/9783181023891

No access

Select for citation download

International Conference on Gears 2023

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2422 2023

Results in this title

M. J. Herberger, F. Rudolph, B. Sievers Efficient concepts for high ratio angular gearboxes S. 801-814

„… transmit-ted normal force, the occurring sliding speed distribution and the local coefficient of friction are …” „… determining the local coefficient of friction, see [7], [9], [10]. Here, the approach according to FVA 519 [10 …” „… for the load-dependent gearing losses. A comparison of calculation methods shows, that the local …”

E. Grabovic, A. Artoni, M. Gabiccini, E. Ciulli Exploration of trade-offs between NVH and efficiency in bevel gear design S. 853-880

„… ] provided an accurate estimation of the local friction coefficient of spur gears under transient …” „… Minimizing NVH and friction-induced power losses is becoming paramount in the design of geared transmissions …” „… . estimation of the elasto-hydrodynamic lubrication (EHL) friction coefficient; Numerous models and methods …”

J. Vorgerd, P. Tenberge, M. Steinrötter Scuffing load carrying capacity of high-speed gears with an isotropic superfinished surface S. 227-242

„… by friction in the local slide-roll contacts due to gear damage and thermal heat emission. The local …” „… increasingly used to reduce friction in the local slide-roll contacts. However, the current calculation …” „… friction. In the scope of this work a local friction model according to LÖPENHAUS [LÖPE15] was modified to …”

B. Devaux, C. Hamon, S. Montani Evaluation of specialty polymer performances in gear applications and the bias between modeling and testing approaches S. 1515-1532

„… .- Friction coefficient: 0.35In DIGIMAT, a commercial software, we can map the local fiber orientation tensor …” „… times and the weight loss being computed on the mean value: VDI-Berichte Nr. 2422, 2023 1519- Amodel PPA …” „… definition of the below parameters for each mesh element, according to its local fiber orientation: - The …”

T. Schmidt, B. Neubauer, D. Merk White Etching Cracks (WECs) on gears of E-Axle applications S. 257-268

„… specific friction energy (ea,kin), high mixed friction conditions, high Hertzian pressure and a critical …” „… to low viscosity in combination with friction modifying additives. Therefore, the Schaeffler derivate …” „… correlates with fracture origin in Fig. 3. Unfortunately point A and E is not useable due to local geometric …”

S. Sklenak, D. Mevissen, J. Brimmers, C. Brecher, B. Lenz, A. Mehner Analysis of Load Cycles and Local Wear of Dry and Solid-Lubricated Gears S. 727-740

„… Analysis of Load Cycles and Local Wear of Dry and Solid-Lubricated Gears Sebastian Sklenak M. Eng …” „… can be found. A distinction can be made between wear of the solid lubricant layer, local layer failure …” „… friction-reducing effect (Fig. 1). In addition to extreme operating conditions, hygiene regulations, such as those …”

M. Yilmaz, M. Ayar, F. Zerulli, K. Humm, J. König, B. Schwarz Gearbox efficiency of eDrives: correlation between measurement and calculation of load-dependent torque losses S. 985-994

„… gear coefficient of friction μmz according to Schlenk (3). The necessary lubricant factor XL value for …” „… of friction μmz and the geometric tooth loss factor HV(L)according to formula (3) are necessary. The …” „… mean gear coefficient of friction as tribological influence can be calculated with the friction …”

M. Geitner, S. Preintner, T. Tobie, K. Stahl Simulation Study on the Tribological Characteristics in the Meshing Contact in the Context of the Load Carrying Capacity Calculation of Internal Gears with Unbalanced Sliding Conditions S. 429-450

„… internal gears remains to be checked. Approaches for the local gear coefficient of friction also need to be …” „… this calculation step serves as a starting value for the following calculation of an isothermal EHL …” „… ∙| | ∙.∙𝑋1.2 ∙ 𝑋 . (3)* Here, the mean coefficient of friction 𝜇 is calculated according to Schlenk [21 …”

B. van Wissen, L. Pastukhov, F. Mitsuzuka, K. Iwanaga, A. Hasanovic NVH performance of thermoplastic gears: modelling and measuring S. 1389-1402

„… were performed at an ambient temperature of 23°C. Due to friction however the local teeth temperature …” „… . This polyamide-based grade has, due to its unique composition, excellent wear and friction properties …” „… modulus, lower hardness and higher damping value polymer gear applications generate less noise compared to …”

W. Ramdane, C. Changenet, S. S. Ouali, C. Chevrel-Fraux, P. Casanova Thermal model of a planetary gear set using an isothermal approach S. 451-466

„… power losses, associated with gear tooth friction and bearing friction; ii) load independent power …” „… losses, generated by sealing friction, bearing hydrodynamic losses and gear churning. Those power losses …” „… friction dissipation [1]. Concerning load independent power losses, different experimental methods [2][3][4 …”

F. Mieth, D. Tazir Local load capacity analysis for the design of a balanced flank modification for cylindrical gears according to bevel gear procedures S. 927-944

„… friction and film thickness, and geometry coefficients like sliding speeds. In addition, the local load …” „… Local load capacity analysis for the design of a balanced flank modification for cylindrical gears …” „… possible types of damage for bevel gears is only possible with the aid of local load capacity analyses [3 …”

A. Drechsel, J. Pellkofer, K. Stahl Transferability of the scuffing load capacity of gear oils determined on spur gears to hypoid gears S. 881-896

„… hypoid scuffing test method. Due to the difference in the absolute value of the friction coefficient for …” „… which the tooth flank surfaces are welded due to an excessively high local temperature occurring during …” „… , Reichert-Friction wear scale, Four-Ball-Fig. 1: Scuffing marks at the drive flank of a hypoid gear [4] VDI-Berichte …”

L. Becker, P. Tenberge Crossed helical gears – simulative studies and experimental results on non-involute geometries S. 1499-1514

„… ) in case of a positive value (also negative values for a convex circular contour are possible, but …” „… of the value u, like the points on the tooth flank before. To calculate the flank pressure …” „… properties, the friction coefficient zm was assumed to be constant and comparable to similar materials …”

B.-S. Kim, D. Im, J.-H. Park, W.-J. Chung, Y.-J. Park Development of Optimal Design Program for Macro-Geometry of Planetary Gear Set using Multi-Objective Optimization Algorithm S. 1181-1194

„… mesh friction loss was calculated as follows through the method defined in AGMA 6123 [10]. 𝑃 𝑃 𝑃 𝑁 …” „… algorithms were used, it was confirmed that they fell into the local minimum and converged to the point with …” „… IGD value converged slowly according to the number of generations, but in the MOMBI-II and RPEA …”

F. Concli, M. N. Mastrone Latest advancements in the lubrication simulations of geared systems: a technology ready for industrial applications S. 499-518

„… load-dependent power losses, i.e. the one related to friction and proportional to the transmitted load. Those …” „… mesh can result in a higher computational cost. The remeshing could be either ”local” or ”global …” „… ” depending regions enabled for re-meshing. In the Local Remeshing Approach (LRA), only the elements having …”

P. E. Schnetzer, J. Pellkofer, K. Stahl Calculation method for wear of steel-bronze rolling-sliding contacts relating to worm gears S. 907-926

„… rest rig under boundary and mixed lubrication to analyze the local coefficient of friction of a worm …” „… investigations in literature. Oehler et al. [6] investigate the friction of steel-bronze contacts on a twin-disk …” „… friction and wear processes exist in the literature. The currently available calculation methods usually …”

M. Vivet, A. Rezayat, J. Verhoogen, K. Kucukcoskun, S. Donders Numerical analysis of bevel gear transmission acoustic emission using a 3D gear contact force model within a multibody system dynamics simulation environment S. 689-702

„… damping gear contact force, and a Coulomb-based friction force [7].Accurate geometry. A set of procedures …” „… approximates the gear pair’s contact deformation as the sum of a global and a local deformation component …” „… and teeth) deflection field due to a contact load but omits the local contact deformation due to this …”

A. Wallinger, R. Vonderschmidt, S. Vonderschmidt Lubricant Free Transmissions for the food industry – A Comparison S. 715-726

„… ; no friction, contactless. Solid lubricants and additives contained in the plastic allow dry running …” „… hardened steel gear wheel, was used as the VDI-Berichte Nr. 2422, 2023724value here. The nominal torque of …” „… most applications, this value is considered sufficient. The gear unit with plastic gears has only a …”

M. Willecke, J. Brimmers, C. Brecher Experimental Investigation of the load carrying capacity of beveloid gears with optimized flank topography S. 125-138

„… taking into account the local material and stress condition as well as the tooth flank micro geometry …” „… values has to be compared. The stress value of the tooth contact analysis equals the allowable stress FE …” „… friction losses within the system during operation, an electric motor is employed, ensuring a constant …”

doi.org/10.51202/9783181024225

No access

Select for citation download

16. Internationale VDI-Tagung Reifen-Fahrwerk-Fahrbahn 2017

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2296 2017

Results in this title

F. Calabrese, C. Ludwig, M. Bäcker, A. Gallrein Parameter-Identifikation eines thermomechanischen Reifenmodells basierend auf Flachbahn-Messungen S. 57-76

„… energy losses due to damping, inner and outer friction. The local energy losses are uses directly as …” „… local heat sources in the thermal model. The friction is modeled temperature dependent (surface …” „… possible to estimate the value of the parameter (dµ/dT) relative to the friction decay with the …”

doi.org/10.51202/9783181022962

Partial access

Select for citation download

International Conference on Gears 2019

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2355 2019

Results in this title

D. Mevissen, C. Lopenhaus, T. Bergs Calculation of mixed friction conditions in large-scale rolling-sliding contacts for different surface structures S. 555-568

„… constant to the value μsolid = 0.097 for all shown tests. The magnitude of the chosen solid friction …” „… defined as a constant value for the entire mixed friction area and thus, independent of the fluid film …” „… Calculation of Mixed Friction Conditions in Large-Scale Rolling-Sliding Contacts for Different …”

B. van Wissen, M. Kanters, F. Mitsuzuka, K. Iwanaga, Ir. A. Hasanovic Predicting wear for high performance plastic gears S. 1323-1334

„… torque level on local temperature When two bodies are in contact, they experience friction, which …” „… very low value of ∆ , resulting in a high local wear factor. Disc-to-disc setup: determining wear …” „… . Especially in gear applications, Stanyl® has proven its value in high performance plastic gears for over more …”

B. Gierl, D. Drummer spur gears S. 1367-1378

„… crosslinking, can decrease friction and wear. The injection molding process also offers the possibility to …” „… design in design guides like VDI 2736 [3]. The treatment of friction and wear problems is from great …” „… practical importance. Friction and wear are phenomena taking place at the part surface and cannot be …”

B. Brodmann, H. Bodschwinna Scattered light measurement on worm gears with high efficiency requirements S. 1567-1578

„… friction coefficient with the Aq value of the worm flank VDI-Berichte Nr. 2355, 20191576 do not contain …” „… Aq value with the coefficients of friction. Figure 10 shows the coefficients of friction of the …” „… friction behaviour of the surfaces and the efficiency of gears. Critical are the material distribution of …”

J. Cathelin Material data for advanced plastic gear simulation S. 1335-1344

„… friction data are given for a steel-plastic pair at room temperature for a rather low PV value, whereas …” „… humidity expansion [1/°C], [1/°Rh%] Center distance correction Friction coefficient [-] Gear temperature …” „… yield is measured (Fig. 3.b). Even though no breaking occurs, the yield stress value should not be …”

M. Yilmaz, T. Lohner, K. Michaelis, K. Stahl Minimizing gear friction with water-containing gear fluids S. 669-680

„… Minimizing Gear Friction with Water-Containing Gear Fluids M.Sc. Mustafa Yilmaz, Dr. Thomas …” „… Universität München, Garching Abstract Lubricants have a large influence on gear friction and therefore …” „… on gearbox losses and heat balance. Synthetic oils can exhibit significantly lower gear friction …”

M. Chapron, Q. Theurillat-Bonjour Tooth contact analysis of non-circular gears with non-involute tooth profiles: Application to horological spur gears S. 925-936

„… to predict the quasi-static behavior, accounting for tooth friction, is discussed. 2.1 Contact …” „… outward direction and (iii) the local radii of curvature ρi with subscript i =1 or 2 for the driving or …” „… conditions and therefore, the influence of tooth friction needs to be implemented. Following [14] and …”

J. Pellkofer, M. Hein, K. Stahl, T. Reimann, M. Hombauer New calculation method of the micropitting load carrying capacity of bevel and hypoid gears S. 517-528

„… thickness For determining the local lubricant film thickness the knowledge of the friction coefficient …” „… into account by means of the local slip factor according to equation (4). A higher strength value is …” „… (based on ISO 10300-series) as well as a local approach for calculating the micropitting load carrying …”

P. H. O. Teixeira, C. Lopenhaus, C. Brecher, T. Bergs Discretization of the contact conditions considering the grain engagement for generating gear grinding S. 1739-1748

„… quality. However, due to the friction generated in the contact zone, high temperatures are achieved …” „… cutting force measurements. It represents a local quantity of the instantaneous specific energy, depending …” „… specific point in the gear flank, the involute can be approximated by a circle with a specific local …”

A. Weis, T. Deliktas, M. Liewald, N. Missal Cold forging of gear components by a modified Samanta process S. 1765-1776

„… forming process, large friction surfaces and increased punch forces are expected. The second approach …” „… counteracts VDI-Berichte Nr. 2355, 20191766 this problem of large friction surfaces by introducing a …” „… reduced until the required value is attained (Contour 3 in Fig. 2a). In order to ensure a complete die …”

M. Ruzek, F. Ville, P. Velex, Y. Marchesse Windage power loss reductions in high-speed gear pairs S. 91-100

„… accelerated to its maximal speed by a friction wheel. Once the maximum speed is reached, the friction wheel …” „… the maximum local Mach number was found to be equal to 0.4 when rotation frequency equals 150 Hz. The …” „… gear-pinion pair configurations. When sliding mesh is employed the timestep value ( t) is chosen so that t …”

N. C. Ecke, A. K. Schlarb, J. Holler, Jan Niedermeyer, P. Klein Thermal simulation of anisotropic PEEK-based tribocomposites S. 1411-1420

„… lubricant to lower the coefficient of friction [1-2]. A further improvement of the materials’ performance …” „… regarding both friction and wear can be achieved by the incorporation of micro- and nanoparticles [3-7 …” „… the fibers, a modification of the orientational parameter A was used. The value of A in a direction x …”

C. Boehme, D. Vill, P. Tenberge Extension of the application limits for crossed helical gearboxes by new geometries for smaller sliding paths or smaller contact pressures S. 1299-1310

„… paths and efficiencies After defining the basic meshing geometry with the contact path AE, the local …” „… flank parameters, the pressure according to the Hertzian theory, the local flank velocities, the …” „… of the normal force. Local velocities are obtained for the flank points and sliding paths can be …”

L. Hui, X. Changl, Y. Shouw, L. Cheng, Z. Chen, L. Yu Research on Dynamic Drum Shape Modification of Helical Gear Pair S. 1011-1026

„… value. 0 1 2 ， 0 can be expressed as: 0 0 1' t (1) where， t is time， 0 …” „… profile error. ,p ie is the equivalent value of the gear assembly error projected on the meshing line …” „… friction, as shown in equation (13): =f mF F (13) The calculation process of the distributed …”

F. Concli, L. Maccioni, C. Gorla Power loss analysis of different high-power density gearbox typologies: CFD analysis and experimental measurements on a cycloidal gear set S. 101-114

„… the sheared force is maximum, the equivalent curvature has its maximum value as well. This is …” „… friction of bearings (on the eccentric input shaft), between the rollers and the cycloidal disk, in the …” „… ( ) of the mixture in each cell of the domain are calculated as an -averaged value of the properties of …”

doi.org/10.51202/9783181023556

Partial access

Select for citation download

Dritev – Drivetrain For Vehicles 2019

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2354 2019

Results in this title

U. Stockinger, H. Pflaum, K. Stahl Single vs. multi-cone synchronizers with carbon friction lining – A comparison of load limits and deterioration behavior S. I-455-I-470

„… multi-cone synchronizers, µ is the same on each friction surface and dm is the mean value of each friction …” „… surface. This results in higher local surface temperatures on the friction surface of the single cone …” „… on the friction surface, which resulted in higher local temperatures of the single cone synchronizer …”

A. Lampe, R. Serway, L. Große Siestrup, C. Gühmann Artificial intelligence in transmission control – Clutch engagement with reinforcement learning S. I-113-I-132

„… such as the start-up controller for automatic transmissions with friction clutch as start-up element …” „… additional friction loss constraints which must be taken into account when defining the control targets. As a …” „… in great demand for state-of-the-art solutions and high-value products. This explains why heuristic …”

A. Viehmann, J.-E. Schleiffer, S. Rinderknecht Evaluation of the dedicated range-extender transmission powertrain concept DE-REX regarding efficiency, costs and complexity – Comparative assessment of electric and hybrid powertrain configurations b... S. I-21-I-48

„… encountered by applying powershift elements like friction clutches (e.g. dual clutches) which in term are …” „… costly and burdened with a high application effort (e.g. lifetime adaption of the friction element …” „… by installing two EMs with half power instead of one powerful EM. Instead of using friction clutches …”

doi.org/10.51202/9783181023549

Partial access

Select for citation download

Dritev 2022

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2401 2022

Results in this title

G. Göppert, M. Adrian AI Approach to Wet Friction Torque Model Adaptation S. 321-334

„… AI Approach to Wet Friction Torque Model Adaptation Georg Göppert, Marcel Adrian, Schaeffler …” „… of a friction system plays a central role for example in P2 hybrids to fulfill seamless shifts or …” „… demonstration of feasibility has two aspects. The one aspect is the technical question, if wet friction torque …”

P. He, A. Eßer, S. Rinderknecht, M. Schmiedt A Degradation Model of a Wet Friction Clutch based on Theoretical and Experimental Analysis and the Application for a Condition Monitoring Method S. 303-320

„… W. Shen, “Clutch Shud-der Correlated to ATF Degradation through Local Friction vs. Velocity …” „… A Degradation Model of a Wet Friction Clutch based on Theoretical and Experimental Analysis and the …” „… analyzed the friction vibrations in the clutch. It is well known that the coefficient of friction (CoF …”

M. Hein, S. Prinke, A. Damm, P. Fischer Testing of shift elements – Standardized Methods, State of the Art and Future Challenges S. 73-94

„… value mainly influences the design parameters (no. of friction elements). Furthermore, it is a main …” „… ) ???∑ (5) VDI-Berichte Nr. 2401, 202280The absolute value of the mean friction power ? is then put into …” „… specific value for the maximum friction power is more common. The specific maximum friction power can be …”

J. Merckling Use of Power-Dense Fuel-Efficient Tapered Roller Bearings in E-Drives under Low-Viscosity Oil and High-Speed Conditions S. 153-168

„… rib speed (dN about 540000). This value is in line with the maximum guideline for circulating oil …” „… cause local temperatures at the cone rib-roller end contact to become ex-cessive and generate …” „… and conformity of these surfaces, which may reduce the coef-ficient of friction and heat generated …”

doi.org/10.51202/9783181024010

No access

Select for citation download

Model-Based Control of a Turbocharged Diesel Engine with High- and Low-Pressure Exhaust Gas

Matthias Patrick Alexander Mrosek

Series: Verkehrstechnik/Fahrzeugtechnik

Volume 803 2017

Results in this title

Titelei/Inhaltsverzeichnis S. I-XX

„… . . . . . . . . . . . . . . . . . . . 8 3 Semi-Physical Mean Value Engine Model 12 3.1 Intake and Exhaust System …” „… . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.2 Mean Value Cylinder Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.3 …” „… Turbocharger Heat Transfer . . . . . . . . . . . . . . . . . . . . . . . . 31 3.4 Mean Value Engine Model …”

Introduction S. 1-7

„… influence the fuel-mixture generation to avoid local rich fuel mixtures with lack of oxygen, which lead to …” „… wall heat losses, less friction, lighter engines, a higher efficiency in partial load and consequently …” „… is invariant to the engine operation point. Dynamical reference value generation for the HP- and …”

Air Path Control Design and Dynamical Reference Value Generation S. 102-167

„… 102 7 Air Path Control Design and Dynamical Reference Value Generation After the control variables …” „… with test bench measurements. The final part of this chapter is devoted to the reference value …” „… with a combination between reference value generation and air path control scheme and rates different …”

doi.org/10.51202/9783186803122

Partial access

Select for citation download

Friction Potential Estimation for Autonomous Driving

Thorsten Lajewski

Series: Verkehrstechnik/Fahrzeugtechnik

Volume 816 2022

Results in this title

Introduction S. 1-35

„… value of measurements on dry asphalt is around 0.9.On wet asphalt a reduction in the friction potential …” „… the set nominal value or the conditions to classify an accident ascaused by low friction potential are …” „… significantly lower friction value should be used for thevelocity adaptation. Figure 1.4 left shows an examplary …”

Fundamentals of Tyre Friction and its Effect in Tyre Models S. 36-54

„… short period of time. The devicealso allows the measure of a friction potential value. This measured …” „… friction potential value on hardpacked snow was measured between 0.3 and 0.6. The slip-stiffness of the …” „… butalso polishes the ice surface further reducing the hysteresis friction. The local melt-ing depends on …”

Intermediate Layer Classification S. 104-126

„… the SWB measurementson the test course, a change from dry to damp conditions decreases the friction …” „… po-tential by some margin, while ice or snow massively reduces the friction potential.Therefore, in this …” „… pixel in the radar image ischosen. For each of the three radar products, the value of this pixel and the …”

doi.org/10.51202/9783186816122

Partial access

Select for citation download

Dritev – Drivetrain For Vehicles 2018

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2328 2018

Results in this title

M. Mileti, H. Pflaum, K. Stahl TorqueLINE cone clutch: Thermo-mechanical stability of cone clutches for ATs S. I-357-I-368

„… local torque per unit friction area T (i.e. the torque arising in every point on the friction surface …” „… will still dominate the market in the short-to-medium term. The need for a further reduction of local …” „… however a perceptible reduction in shifting comfort. To unite the advantages of a multiple disc friction …”

M. Behzad, V. Saxena, M. Schaefer Thermal-hydrodynamic optimization of grooves in a wet clutch S. I-101-I-118

„… in terms of friction characteristic which is the key for torque response and controllability as well …” „… cut into friction linings that are bonded to the friction plate (FRP), (b) a separator plate (SP) and …” „… reaches its minimum value, where the asperity contact supports majority of the applied load. The current …”

D. Bauer, M. Alexander Loss-optimized design of a high performance electrical machine for electric and hybrid cars S. II-183-II-196

„… A, characterized by minimum cycle losses, value: 1 kWh/100 km PSM B, characterized by very high …” „… cycle losses, value: 2 kWh/100 km Based on this scenario it can be shown that 600 € on battery cost can …” „… in an electrical machine Friction losses will be neglected within this paper. VDI-Berichte Nr …”

K. Bennewitz, A. Mann Powertrain electrification exemplified by the VW Golf S. II-135-II-168

„… Elektrifizierungsbaukasten”, MEB) combines local zero-emissions driving with long-distance mobility. 1. Boundary …” „… optimum solution within the conceivable propulsion systems. It basically has no local emissions in normal …” „… for local zero-emission driving. Today’s BEVs offer ranges that cover most everyday driving profiles …”

L. Dedeleit, M. Ayeb, L. Brabetz Short circuit calculation of permanent magnet synchronous machines with comsol multiphysics S. II-197-III-VII

„… constant friction of 7 Nm is assumed here. This results in the speed dependent torque curve. Fig. 6 …” „… with inverter, the maximum regenerative torque is approx. 38%of its nominal value. The maximum is …” „… . This local magnetization characteristic J(x,y) after the SSC is then passed on to further simulations …”

doi.org/10.51202/9783181023280

Partial access

Select for citation download

Kupplungs- und Bremssysteme für mobile und stationäre Anwendungen

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2414 2023

Results in this title

P. Strobl, T. Schneider, K. Voelkel, K. Stahl Influence of the Steel Plate on the Friction Behavior of Automotive Wet Disk Clutches S. 21-48

„… details of the plates. Parameter Unit Value outer friction diameter da mm 168.0 inner friction diameter di …” „… very low sliding speeds needs special treatment in evaluating the friction behavior. To minimize local …” „… friction coefficient value is compared to the median from the sixteen individual measurements of an areal …”

L. Pointner-Gabriel, K. Voelkel, H. Pflaum, K Stahl A Methodology for Data-driven Modeling and Prediction of the Drag Losses of Wet Clutches S. 125-154

„… around a quasi-steady value can be observed. Consequently, the local minimum shear stress 𝜏 , of Phase …” „… the material properties of the friction lining affect the drag loss behavior [12, 21]. The …” „… sizes and numbers of gaps, the drag torque is related to the mean diameter and the total friction …”

C. Sax, A. Stroh, R. Leister, M. Dreisbach, J. Kriegseis, C. Denda, P. Bürk Fluid-mechanical evaluation of different clutch geometries based on experimental and numerical investigations S. 109-124

„… experimental studies could quantify the local wall shear stress. Additionally, the volumetric flow topology …” „… within the investigated groove geome-tries and their local influence on the wall shear stress …” „… relative rotation of the disks (friction and steel disks). In the present case of braking operation, this …”

doi.org/10.51202/9783181024140

No access

Select for citation download

Gleit- und Wälzlagerungen 2021

VDI Wissensforum GmbH (ed.)

2021

Results in this title

D.-O. Leimann Ermittlung der Einflussfaktoren für Schlupf, Hydrogen und Stromdurchgang in der Berechnung zur Abschätzung des Risikos auf frühzeitige Lagerschäden durch White Etching Cracks WEC S. 161-176

„… stresses comparable, friction and hoop stress as calculated, (see equation 2), a harmful stress value can …” „… multiplied with the force value, coming from the basic friction force according to literature. 0,00 50,00 …” „… hydrogen βM-H can decrease the calculated permissible stress value permissible (yM . The equation …”

doi.org/10.51202/9783181023785

Partial access

Select for citation download

Kupplungen und Kupplungssysteme in Antrieben 2021

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2382 2021

Results in this title

V. Föge, S. Blaschke New semi-dry friction solution for highly integrated active torque-controlled drives S. 103-114

„… New semi-dry friction solution for highly integrated active torque-controlled drives Volker …” „… to reconcile these drastic actions towards efficiency enhancement with constant friction performance …” „… development process from raw materials to the final application within the Miba Friction Division. 1 …”

D. Groetsch, K. Voelkel, H. Pflaum, K. Stahl Echtzeit-Temperaturberechnung und Temperaturprädiktion nasslaufender Lamellenkupplungen S. 115-128

„… clutches is the temperature on the friction interface. Owing to the thin, rotating geometry of the plates …” „… temperature-dependent friction behavior is assumed. The model is validated on a test rig and in a vehicle transmission …” „… strategy. In addition, they show a strong temperature-dependent friction behavior. The model shows a very …”

doi.org/10.51202/9783181023822

Partial access

Select for citation download

DRITEV – Drivetrain for Vehicles 2021

VDI-Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2381 2021

Results in this title

S. Dussinger, T. Wiedemann, B. Harter, B. Wiedenmann Simulation of induced axial forces on planet gear bearings at example of ZF’s 8-speed automatic transmission S. 469-486

„… aim of improving energy efficiency and reducing CO2 emissions, friction losses within driveline …” „… friction losses. The investigation is carried out using finite element simulations. Important influencing …” „… such as gear assemblies increases steadily. Friction effects in planetary gear sets from ZF’s 8 …”

M. Dilzer BorgWarner P2 Modules – from HV to 48V S. 35-46

„… specifically balance their portfolio and control fleet emissions which are strongly dependent on local markets …” „… and local legislative boundary conditions. BorgWarner – Positioning for the future To account for …” „… . The P2 PHEV gives the best economic value and typically offers up to 60% CO2 reduction in comparison …”

H. Wittig, J. Engasser, A. Glavinic AEROFLEX – Distributed Hybrid Drivetrain for Long Haul Freight Vehicles S. 593-608

„… stability guard function restricts the room for torque distribution. In each trailer unit a Local System …” „… request between the friction brakes and the electric drive. The service brake request is distributed with …” „… friction brakes. Therefore, it communicates with the dolly EBS via an additional ISO 11992 CAN connection …”

F. Müller-Deile Advanced design of electric machines for trailers with electric axles S. 653-668

„… meaning hybridization or full electric vehicles. As an alternative to the local hybridization of the …” „… truck EBS. The other endurance brakes of the truck and the friction brakes are only activated if the …” „… form the truck EBS and other local parameters such as the battery charge status and component …”

S. Kaimer Power to the Wheels – Challenges and Benefits of Electrified AWD for EVs and Hybrid vehicles S. 117-124

„… opportunity There is a consensus that future CO2 targets and local requirements of zero-emission driving …” „… the mTV, generates the torque difference by raising the effective value above the nominal torque of …” „… were primarily used to improve traction, for example off-road or in poor friction conditions such as …”

T. Kaufhold, F. Schneider, O. Groneberg, A. Moser Modular Starting and Damping System integrated in 48V Hybrid Architectures – Efficient Starting System for Hybrid Vehicle Architectures S. 347-360

„… ICE start and the physical starter disconnect. The biggest value added through the PES is its drag …” „… roller mass below a certain level is not recommended, since the impact of friction and contamination …” „… which results in minor drag torque of the dry friction bushing. After engine start, the ring-gear and …”

A. Bagh, D. Magnor, J. Kneiber, F. Löhe eTransport – Application of axle-integrated e-drive in urban LCV and MD trucks S. 637-652

„… , in cooperation with development partners, is able of retrofitting existing trucks to provide local …” „… high friction losses. In addition VDI-Berichte Nr. 2381, 2021640 to this the single wheel drive …” „… motor and gear transmission. High power density is attended by local power loss that must be …”

M. Muether, B. Heuser, L. Virnich, A. Guedden, T. Luediger, D. van der Put Development trends towards CO2-neutral powertrains for HD applications S. 529-550

„… losses and reducing engine friction improves efficiency by ~1.0 %points. In the second phase an updated …” „… regulations are not clearly defined yet and/or have major uncertainties (e.g., local access restrictions …” „… value in EGR case) or leaner, both CO and HC emissions are near zero. Brake Specific NOx Emissions …”

doi.org/10.51202/9783181023815

Partial access

Select for citation download