VDI Verlag eLibrary

Gleit- und Wälzlagerungen 2019

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2348 2019

Results in this title

S. Bill Higher efficiency and lifetime improvement for bearings S. 325-328

„… examine the friction and wear behavior of materials and coatings and the lubricant properties in loads by …” „… greases to gage their wear and friction behavior under lubricant and bearing-specific influences. To …” „… run better with reduced friction, temperature, surface roughness and great reliability and durability …”

T. Amann, A. Kailer, W. Chen, J. Rühe Entwicklung von galvanisch gekoppelten Gleitlagern mit niedrigen Reibungs- und Verschleißwerten – Verwendung von komplexen Fluiden als Schmierstoff und als Additiv in Wasser zur tribologischen Optimie... S. 33-44

„… Verschleißreduktion um 40 % im Vergleich zu einem Referenzöl. Abstract Friction and wear cause total global …” „… benefits of ultra-low friction, wear-free sliding and friction control, and water-based lubrication in …” „… improved friction and wear in model friction tests. Plain bearing tests with the mesogenic lubricant show …”

D. Kürten, A. Kailer, I. Khader Hydrogen assisted rolling contact fatigue S. 273-286

„… constant normal load of FN = 25, 50, 75 or 100 [N]. Coulomb friction with a constant coefficient of …” „… friction µ = 0.11 was assumed based on the average frictional coefficient determined in a series of …” „… measurements carried out using the ball-on-disk tribometer. Isotropic linear elastic material behavior was …”

S. Wandel, F. Schwack, G. Pol Oszillierende Wälzlager in Windenergieanlagen – Abgrenzung der Schadensmechanismen S. 221-232

„… . (2010) Oil film behavior under minute vibrating conditions in EHL point contacts. Tribology …” „… International, 43(8), 1279–1286. 8 Stammler, M., Schwack, F., Bader, N., Reuter, A., Poll, G. (2018) Friction …” „… Glovnea, R.P. and Spikes, H.A. (2002) Behavior of EHD Films During Reversal of Entrainment in Cyclically …”

doi.org/10.51202/9783181023488

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Schwingungen 2021

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2391 2021

Results in this title

A. Baumann Schwingungsverhalten von Zahnradgetrieben – Vibration behavior of gear transmissions S. 285-302

„… that the coefficient of friction of the gear oil also depends on the load in contact. The behavior is …” „… coefficient of friction behavior and noise emissions in gearboxes. References [1] Lachenmeier, S.; Weck …” „… Schwingungsverhalten von Zahnradgetrieben Vibration behavior of gear transmissions Dr.-Ing …”

doi.org/10.51202/9783181023914

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LAND.TECHNIK AgEng 2023

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2427 2023

Results in this title

C. A. Arévalo-Montaña, S. Böttinger Tractive effort prediction based on dynamic soil parameters S. 235-246

„… development of the Hohenheim Tyre Model, which simulates the dynamic behavior of agricultural tyres on firm …” „… shear rates. 2 Introduction With the aid of simulation, it is possible to predict the behavior of the …” „… are, the lack of suspension systems, tyre behavior, the need for sufficient traction in the field, the …”

C. Schaub, R. Schütte Performance optimization of CVT standard tractors in front loading application S. 21-28

„… all applications. This paper discusses the optimization of driving behavior for front loading …” „… applications by means of an additional software-based driving mode. Finally, the behavior is compared with …” „… requires a direct driving behavior for a precise stopping within a loading-cycle. The drive controller of a …”

A. Tamrakar, M. Roberge Grain Handling Simulations in Combine Harvester – Simulation Development, Validation and Optimization S. 395-402

„… methodology which is commonly used to model the behavior of individual grains within the system. Fig. 1 …” „… DEM simulation is a computational technique used to model the behavior of discrete, interacting …” „… understanding the grain flow behavior, DEM models are also instrumental in comprehending grain damage and …”

C. Korn, T. Herlitzius, K. Lüpping, A. Afting Study on the use of DEM for the optimization of pelleting rollers S. 403-412

„… , specific 1D and 2D numerical approach for pelleting, encountering friction and material compression, is …” „… in order to investigate breakage behavior of pellets [13]. Discrete Element Method (DEM) applications …” „… behavior of biogenic pellets was investigated in [5]. Advices how to model, calibrate and validate …”

doi.org/10.51202/9783181024270

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Drivetrain for Vehicles 2016

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2276 2016

Results in this title

J.-N. Mach, G. Poll Influence of surface structures on the operational behavior of continuously variable transmissions S. 919-920

„… Influence of surface structures on the operational behavior of continuously variable transmissions …” „… for power transmission by friction. In the research work presented here it was investigated how …” „… far intentional structuring of the torque converter surfaces can influence the traction behavior of …”

F. Brezger, A. Moser Energy Saving Potentials by Advanced Functionalities of Clutch or Brake actuator Systems for Vehicle Drivetrains S. 137-156

„… designed as friction clutches or brakes in the vehicle. In a 8- or 9-speed automatic 2 clutches are …” „… usually engaged for a selected gear, as well as the lock-up clutch. Also CVTs usually have friction …” „… keep normal forces at clutch disks. The transmittable toque is determined by the occurring friction …”

T. M. Wolf Optimizing the gearbox efficiency rate by rolling bearings – Six speed manual transmission for front wheel drive cars S. 281-296

„… the primary task is the definition of a friction optimized internal bearing geometry. It is …” „… demonstrated that minimal bearing friction VDI-Berichte 2276, 2016 281 on the one hand and high bearing …” „… friction and hence generate corresponding power loss. Therefore the challenge for the bearing supplier is …”

S. A. Pahlovy, S. Faria Mahmud, M. Kubota, M. Ogawa, N. Takakura Improvement of transmission efficiency by reducing the drag torque in disengaged wet clutch – Development of a model for calculating drag torque or spin loss of disengaged wet clutch of transmission S. 879-896

„… schematic images of a clutch pack and the major components of a clutch pack respectively. A friction disk …” „… model, we have conducted visualization tests to investigate the fluid behavior in between clutch disk …” „… equipment section. A high speed camera was used to capture the fluid behavior during the test. The tests …”

K. Fronius, A. Harsch, P. Neuwirth, J. Gindele The AMG SPEEDSHIFT DCT from the Mercedes-Benz 7G-DCT Family – Performance for the Road and Race Track in the Compact Segment S. 53-68

„… : Twisted tooth flank for optimized contact pattern The number of friction surfaces in the 7G-DCT AMG …” „… race track. In order to achieve the best possible self-steering behavior as well as good traction …” „… The actual lock consists of a multi-disk clutch with four friction pairings made of steel with …”

J. Utz, V. Lichtenwald, G. Hirt Short Synchro (STSS) – reduced shift travel for MT’s and DCT’s – Development of a synchronizer system for future demands in transmissions S. 231-242

„… costs due to a reduction in the number of friction cones while maintaining the same gearshift force and …” „… using ring packages with high stiffness, highly wear resistant friction layers or restricted axial …” „… system were not reduced. The wear reserve, clearance and friction layer width of the ring package are …”

A. Albers, U. Reichert, S. Ott, A. Radimersky Software supported development of a Battery Electric Vehicle powertrain considering the efficiency S. 321-338

„… condition. This can lead to suboptimal driving-behavior or efficiencies of the car. For example the gear …” „… friction losses within the shifting progress [12]. In summary, the increasing volume and losses of gearbox …” „… without traction interruption, the specific friction work and the specific shifting capacity are …”

M. Maisch, M. Homm, U. Keller The Highly Efficient 9GH-TRONIC Plug-In Hybrid Transmission by Mercedes-Benz S. 339-352

„… speed range. A fundamental design requirement here is an almost friction-free behavior of the spring …” „… change from purely electric drive to hybrid driving. To achieve an excellent noise behavior, a highly …” „… - GEN2 powertrain 7G-TRONIC Plug-In GEN3 powertrain 9GH-TRONIC friction reduction energy for additional …”

W. Hinz, G. Bednarek The new 8-speed FWD Automatic Transmission for General Motors / A. Opel AG S. 383-396

„… Fig. 3). The LaCrosse has a 207 k torque converter. The transmission is filled with low friction oil …” „… damper technology used to ensure premium noise and vibration behavior (NVH) for the customer. Cylinder …” „… manages both timing and shock control to guarantee seamless and quick shift behavior for all skipped …”

B. Löffler, J. Patzner, M. Drabek, K. Armbruster Modular 8-Speed Hybrid Dual Clutch Transmission With Integrated All-Wheel Distributor by ZF S. 85-100

„… the 8DT gear set's acoustic behavior. The same applies to the new operating states which are enabled …” „… ). As a consequence, the deformation behavior is generally different from that of conventional two-shaft …” „… lightweight shafts' deformation behavior. The transmission's complexity is also reflected in the design of …”

R. König, A. Viehmann, S. Rinderknecht Development of the transmission control for a High-Speed Multi-Gear Powertrain Concept for Electric Vehicles S. 543-562

„… control, no friction-based synchronizer parts are necessary. This can save installation space, cost and …” „… increase efficiency due to the fact that there are almost no friction losses when engaging the dog clutch …” „… understanding of the driving and shifting behavior of the Speed2E vehicle, the New European Driving Cycle (NEDC …”

doi.org/10.51202/9783181022764

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Drivetrain for Vehicles 2017

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2313 2017

Results in this title

U. Reichert, A. Albers, K. Wolter, T. Pinner, S. Ott A new approach for the investigation of synchronizations by different shifting characteristics S. 65-66

„… the individual driver-dependent shifting behavior during the development and validation of combustion …” „… are decisively dependent on the shifting time, the differential speed and the friction torque. The …” „… driver. In order to take this individual driver-dependent shifting behavior in consideration during the …”

A. Weidler, H. Beitler, S. Lassi, U. Keller Clutch protection function- Clutch design one size smaller!? S. 71-72

„… . Learning effect for future driver behavior. Clutch failures reduced by approximately 70%. 3. Recording …” „… misuse. 1.2. Friction coefficient with temperature dependence and dispersion If the released thermal …” „… energy induces excessive temperatures on the contact surfaces of the pressure plate/friction lining and …”

N. lkeda Development of a new torque converter clutch control using Engine-CVT harmonized control S. 63-64

„… . However, the useful function of torque converter depends on fluid dynamics, therefore, behavior of …” „… clutch slip control will be introduced. During development, engine speed behavior during launch was …” „… development of the new TCC control. Introduction of Jatco CVT8 The Jatco CVT8 features low friction and …”

doi.org/10.51202/9783181023136

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Systematic Derivation of Objective Requirements on Vehicle Steering System

Martin Ralf Münster

Series: Verkehrstechnik/Fahrzeugtechnik

Volume 819 2023

Results in this title

Subsystem Analysis of the Steering S. 63-92

„… subsystem behavior.The toothed coupling interface at the end of the intermediate shaft represents the input …” „… RackSteering Gear HousingBall-and-Nut GearPinionSteering Wheel with Friction , ,Upper Steering Column …” „… , Electric Motor with Friction, ,Nut Support, Belt Gear (a) Simplified steering model with mixed lumped …”

Titelei/Inhaltsverzeichnis S. I-XVI

„… Simplified Steering Model based on Lumped Masses . . . . . . . . . . . . . . 644.1.1 Case A: Passive Behavior …” „… of the Force-less Electric Motor . . . . . . . 674.1.2 Case B: Passive Behavior of the Motion-less …” „… Electric Motor . . . . . . 684.1.3 Case C: Active Behavior of the Steering-Torque Controlled Electric Motor …”

Introduction S. 1-12

„… all subsystems are integrated into the vehicle.As a consequence, deviations of the desired behavior …” „… level, even though the latter relate tothe coupled behavior of multiple subsystems. The role of …” „… suitable to ensurethe desired disturbance behavior of the vehicle throughout both virtual and …”

Appendix 1 S. 205-224

„… 21 Y 22] [F1F2]. (A.13)Assuming linear behavior of the mechanical system (det(A) = 1), the matrices …” „… LEN_Lr_Freib_c Friction Stiffness [Nm/rad] 5.669 299.96LEN_Lr_Freib_ub max. Static Friction [Nm] 0.019 1.898 …” „… ShaftLEN_Zw_Freib_c Friction Stiffness [Nm/rad] 38.01 46.998LEN_Zw_Freib_ub max. Static Friction [Nm] 32.31e-3 39.48e …”

Bibliography S. 195-204

„… ] Awrejcewicz, J. and Olejnik, P. “Analysis of Dynamic Systems With Various FrictionLaws”. In: Applied Mechanics …” „… ., Olsson, H., Åström, K. J., and Lischinsky, P. “A New Model forControl of Systems with Friction”. In: IEEE …” „… StructuralModification Problems”. In: Shock and Vibration 11.3 (2004), pp. 295–309.[23] Dahl, P. R. A Solid Friction …”

Requirement-Based Module Design Using Solution Spaces S. 153-188

„… , stiffness, damping or friction characteristics.In which multiple ways all of these involved quantities are …” „… ImbalanceRoad-FrictionTire Force FluctuationTransfer FunctionContact Patch HubStiffness Tension Strut BushingLength of …” „… FunctionInput Shaft St. Wheel…Stiffness Servo DriveFrictionInertia Steering Wheel…Stiffness BearingInstall …”

Resulting Subsystem Requirements S. 123-152

„… considerationof nonlinearities in terms of amplitude-dependent behavior, each subsystem is investigatedat multiple …” „… 15 20 25 3024681012141050 5 10 15 20 25 3010-1100101Figure 6.9: Nonlinear behavior of steering …” „… considered by the frequency range covering alldriving speeds. In other words, the nonlinear behavior is …”

Deriving Requirements on Subsystem Level S. 35-62

„… behavior has been given in the introduction already, see Sec. 1.2.There, the so-called “steering feel” has …” „… discs, such as thicknessdefects, non-homogeneous friction conditions, misalignment or permanent …” „… alreadyknown from Eq. (2.19), the behavior of complete system AB can be generally described as[Z BTB 0] [uλ]=[f …”

doi.org/10.51202/9783186819123

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Fahrerassistenzsysteme und Automatisiertes Fahren

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2413 2023

Results in this title

T. Ahrenhold, J. Iatropoulos, R. Henze Entwicklungsprozess eines robusten und reibwertstabilen Steer-by-Wire Lenksystems für das teil- und hochautomatisierte Fahren S. 91-102

„… are adapted in a friction-stable manner. This can compensate the variable transmission behavior on wet …” „… friction coefficient sensitivity and adaptation of the advanced driver assistance systems (ADAS) currently …” „… automated driving. This paper reports on the impact of the road friction coefficient on the transmission …”

doi.org/10.51202/9783181024133

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Gleit- und Wälzlagerungen 2017

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2308 2017

Results in this title

S. Arai Contribution of Frictional Behavior Control in Ball Screw S. 161-172

„… Contribution of Frictional Behavior Control in Ball Screw Satoru Arai, NSK Ltd., Kanagawa Japan …” „… Abstract This paper reviews contribution of controlling frictional behavior in a ball screw installed onto …” „… behavior in a ball screw, an accuracy evaluation of circular interpolation motion with two orthogonally …”

F. König, G. Jacobs, G. Burghardt Einlaufverhalten von Gleitlagern im Start-Stopp-Betrieb S. 53-62

„… the behavior of the plain bearing resulting in film thickness build-up and in friction torque …” „… turbine conditions. This paper will share insights in the behavior of different plain bearing designs by …” „… behavior during different operational conditions. VDI-Berichte Nr. 2308, 2017 53 By applying …”

M. Ooms, K. Krieckemans, M. Goovaerts Plain bearings for wind turbine gearboxes – An update on experience S. 63-72

„… suitable engine bearings regarding wear resistance and frictional behavior is of growing interest. Low …” „… friction and wear for maximum lifetime are key requirements for bearings designed for automotive engine …” „… focuses on the running-in behavior of plain bearings subjected to multiple starts and stops. Test results …”

D. Vaes, P. Tesini, K. Stadler Evaluation of roller slip losses in wind turbine gearbox high speed shaft bearings S. 283-298

„… friction and slip conditions may be facilitators for hydrogen uptake [4], [5]. However, it needs to be …” „… therefore the roller slip behavior in tapered roller bearings is investigated in this paper. Due to the …” „… od elling friction The numerical model should be capable of simulating the cage and the roller slip …”

P. Sauvage, G. Jacobs, B. Lüneburg Calculation model for evaluation of slippage in large diameter bearings – A combined analytical-numerical evaluation of the post-hardening risk due to slippage in large diameter bearing S. 219-230

„… friction was developed in [11]. Friction was included in this characteristic value in [12] and a limit for …” „… the action of the rollers on the outer ring raceway and the friction value between the two contact …” „… friction value ? ? in the acceleration zone is assumed to be constant. The contact energy density is the …”

T. Jurkschat, M. Otto, T. Lohner, K. Stahl Bestimmung des Verlustverhaltens und der Wärmebilanz von Wälzlagern S. 197-206

„… and temperature behavior of the rolling bearings. Practical methods to calculate the loss torque of …” „… FVA/FVV-Vorhabens Low Friction Powertrain VDI-Berichte Nr. 2308, 2017 199 („LFP“) [9] verschiedene …” „… , Low Friction, LAGER2. Erweiterung der Berechnung der Wälzlagerreibung in FVA-Software …”

doi.org/10.51202/9783181023082

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38. Internationales Wiener Motorensymposium 27.-28. April 2017

Hans Peter Lenz (ed.)

Series: Verkehrstechnik/Fahrzeugtechnik

Volume 802 2017

Results in this title

T. Toda, M. Sakai, M. Hakariya, T. Kato Der neue 2.5L Reihen-4-Zylinder-Ottomotor mit Toyota Neue Global Architektur Konzept /The New Inline 4 Cylinder 2.5L Gasoline Engine with Toyota New Global Architecture Concept S. I-71-I-100

„… lubulication systems have been adopted to improve fuel consumption by reducing cooling and friction losses. As …” „… relationship with friction, and further S/B ratio increase deteriorates thermal efficiency. Specific power …” „… - Under high piston speed, it is difficult to balance oil consumption and low friction. To do that, the …”

doi.org/10.51202/9783186802125

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Zylinderlaufbahn, Kolben, Pleuel

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2282 2016

Results in this title

D. López, R. Hügel, E. Nocera, J. Araujo, L. Nascimento Innovative Carbon Coating concepts for Piston Rings S. 105-116

„… temperature on friction, wear and scuffing behavior of piston ring cylinder liner contacts - a new model test …” „… mechanical losses are mandatory, thus a strong requirement to reduce the friction contribution in the Power …” „… viscosity oils by OEMs as a main path to achieve friction reduction might impact severely the boundary …”

M. Blümm, T. Fuhrmann, A. Baberg, F. Dörnenburg Innovative Kolbenschaft- und Bolzenbeschichtungen für Otto- und Dieselmotoren S. 187-198

„… Relationship between Grafitization and Friction Behavior of DLC Coating, Surface and Coating Technology (1996 …” „… Trockenschmierstoffbeschichtungen, die sogenannten Grafitschichten oder Anti Friction Coatings abgelöst. Die herkömmlichen …” „… niedrigviskosere Öle zum Einsatz gebracht. Weiterhin wird über „friction modifyer“ versucht die Reibungssituation …”

doi.org/10.51202/9783181022825

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AgEng LAND.TECHNIK 2022

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2406 2022

Results in this title

P. M. Roth, F. M. Appich, S. Böttinger Interaction properties of wheat straw and grain for Discrete Element Method S. 549-554

„… separation in combine harvesters or the mass flow in ball mills. In this study static friction coefficients …” „… coefficient of static fric-tion has been investigated using the inclined plane test setup. The wheat straw has …” „… . The coefficient of static friction has been investigated as a function of contact pressure. To …”

L. Brinkschulte, S. Antoni The best of two worlds: Spray boom control with hydropneumatic suspension technology S. 291-298

„… the cylinders and joints. But for a good suspension performance, the friction of the cylinders and …” „… joints must be as low as possible. Additional and adjustable damping based on hydrodynamic friction can …” „… influence of the variable damping on the suspension behavior during an exemplary test run with a trailed …”

doi.org/10.51202/9783181024065

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Verschleiß- und feuchteresistente MoS2- Festschmierstoffschichten für den Gleit- und Wälzkontakt

Bernd Vierneusel

Series: Konstruktionstechnik/Maschinenelemente

Volume 440 2017

Results in this title

Literaturverzeichnis S. 179-204

„… .: Preparation by ion-beam-assisted deposition, analysis and tribological behavior of MoS2 films. Surf. Coat …” „… . Literaturverzeichnis 182 /38/ BOWDEN, F.P.; TABOR, D.: The Friction and Lubrication of Solids. Oxford: Oxford …” „… . Tribol. Trans. 17 (1974), S. 300–306. /56/ CZICHOS, H.: Design of friction and wear experiments. In …”

Titelei/Inhaltsverzeichnis S. I-XVIII

„… ) are often employed to ensure low friction between moving surfaces, their performance is very …” „… solid lubricant system. The sustainable understanding of the coating behavior and its link to the …”

doi.org/10.51202/9783186440013

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Friction Potential Estimation for Autonomous Driving

Thorsten Lajewski

Series: Verkehrstechnik/Fahrzeugtechnik

Volume 816 2022

Results in this title

Development of a Friction Potential Measurement Method S. 55-80

„… 3 Development of a Friction PotentialMeasurement MethodIn this chapter, a new method to measure the …” „… friction potential using a test vehicle isdeveloped. The idea behind this method is to reduce the …” „… possible deceleration is reached while one wheelis reaching the friction potential. After a short …”

Bibliography S. 155-174

„… of California.48. DEUR, J.; IVANOVIĆ, V.; PAVKOVIĆ, D. et al. On low-slip tire friction behaviorand …” „… Tire-Force Ellipse (Friction Ellipse) and Tire Char-acteristics. In: SAE Technical Paper. SAE International …” „… friction performance models. In: 2nd international colloquium on vehicle tyreroad interaction, Friction …”

Introduction S. 1-35

„… , this canincrease the importance of a friction potential estimation system.1.1 MotivationThe Society of …” „… driver has to take over the dynamicdriving task. In contrast to this behavior, level 4 systems must be …” „… property road friction potential, which defines the possible vehicle accelerations,can be one of the …”

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 …” „… ’Friction’ EU-project [66] and the MARWIS sensor were considered as ground truth sensors. Bothsensors …”

doi.org/10.51202/9783186816122

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Zylinderlaufbahn, Kolben, Pleuel

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2317 2018

Results in this title

F. König, G. Jacobs, C. Sous Prognose von Gleitlagerverschleiß im Start-Stopp-Betrieb S. 197-208

„… wear resistance and frictional behavior is of growing interest. Low friction and wear for maximum …” „… behavior of plain bearings subjected to multiple starts and stops. Test results show that running-in leads …” „… to reduced friction losses with increasing number of cycles. In an EHL-simulation approach, the …”

G. Eitzinger Optimierte Gleitlagerfunktion eines Pleuels durch die Integration in das große Auge S. 181-196

„… stop, mixed friction … behavior. Polymer coatings have a very good wear behavior, a low coefficient of …” „… enabler to reduce friction losses in the whole engine. Excellent wear-resistance and high load-ability in …” „… friction in mixed friction area from 0,03- 0,08 and dependent on used additives a very good emergency …”

doi.org/10.51202/9783181023174

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LAND.TECHNIK 2020

VDI Wissensforum GmbH (ed.)

Series: VDI-Berichte

Volume 2374 2020

Results in this title

A. Lindenberger, C. Korn Parameter identification for Discrete-Element-Method (DEM) particles of a self-propelled forage harvester (SPFH) chopping sample S. 135-142

„… , to achieve an optimized state, the behavior of crop-flow processes needs to be better understood …” „… , Young’s modulus as well as contact describing parameters like coefficient of rolling friction …” „… , restitution, and static friction have to be known. Shape and material parameter like mass and volume can be …”

doi.org/10.51202/9783181023747

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Results (186)