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VDI Wissensforum GmbH - International Conference on Gears 2019

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VDI Wissensforum GmbH (ed.)

International Conference on Gears 2019

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

VDI Wissensforum GmbH - Dritev – Drivetrain For Vehicles 2019

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VDI Wissensforum GmbH (ed.)

Dritev – Drivetrain For Vehicles 2019

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

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VDI Wissensforum GmbH (ed.)

Dritev 2022

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

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

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Matthias Patrick Alexander Mrosek

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

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

Thorsten Lajewski - Friction Potential Estimation for Autonomous Driving

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Thorsten Lajewski

Friction Potential Estimation for Autonomous Driving

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

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