排序方式: 共有8条查询结果,搜索用时 31 毫秒
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轮轨接触力学的最新发展 总被引:6,自引:0,他引:6
文章重点讨论车轮/钢轨的流动接触问题,着重介绍了如何处理轮轨材料变化、磨损和蠕滑现象,并详细介绍了各种方法,包括最新遵循拉格朗日-欧拉原理的有限元法。最后给出了关于轮轨破坏的机理。 相似文献
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K. Knothe A. Gross-Thebing 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1986,15(3):133-153
Kalker's creep coefficients for linear rolling contact problems are only valid in the steady state case. A method for the extension of linear contact mechanics into the high frequency range is presented. Frequency dependent creep coefficients are obtained, which can be interpreted as harmonic responses of the creep forces for harmonically varying creepages. For linear investigations of contact phenomena in the high frequency range simple laws governing the Kalker coefficients C11and C22 are given. 相似文献
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History of Stability of Railway and Road Vehicles 总被引:4,自引:0,他引:4
K. Knothe F. B hm 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1999,31(5):283-323
Stability of running of vehicles is one of the important design criteria of railway and road vehicles. Railway vehicle stability is based on kinematics as well as contact mechanics. It reaches back to the 19th century and had its first hey-day with the work of Carter and Rocard on stability of locomotives. A rediscovery of their knowledge, which seemed to have been forgotten, was inevitable due to increased vehicle speeds since the early Fifties. — Though investigations on road vehicle stability only began approximately in 1930 with the treatment of the shimmy phenomenon, realistic solutions were available at the same time as for railway vehicles. Besides considering historical aspects we discuss in the paper links which exist between both approaches; open questions are described. 相似文献
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Advanced Contact Mechanics-Road and Rail 总被引:7,自引:0,他引:7
Klaus Knothe Ralf Wille Bernd W. Zastrau 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2001,35(4):361-407
The development of contact theories and numerical formula for various applications is a field which expands rapidly. This publication focuses on the rolling contact problem both for tire-road and wheel-rail contact. For the tire-road application a central problem is the modeling of the composite structure of the tire under internal pressure and axle load. One actual contact problem is the rolling on soft soil, which is discussed as the main application. In the wheel-rail case the contact area is much smaller and much more emphasis has been laid on the treatment of material changes, wear and creep phenomena. These approaches are discussed in detail as well as a more recent finite element formulation following the arbitrary Lagrange-Eulerian concept. Ideas about damage mechanisms finish the article. 相似文献
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Kl. Knothe S.L. Grassie 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1993,22(3):209-262
A review is presented of dynamic modelling of railway track and of the interaction of vehicle and track at frequencies which are sufficiently high for the track's dynamic behaviour to be significant. Since noise is one of the most important consequences of wheel/rail interaction at high frequencies, the maximum frequency of interest is about 5kHz: the limit of human hearing. The topic is reviewed both historically and in particular with reference to the application of modelling to the solution of practical problems. Good models of the rail, the sleeper and the wheelset are now available for the whole frequency range of interest. However, it is at present impossible to predict either the dynamic behaviour of the railpad and ballast or their long term behaviour. This is regarded as the most promising area for future research. 相似文献
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Direct Covariance Analysis for the Calculation of Creepages and Creep-Forces for Various Bogies on Straight Track with Random Irregularities 总被引:1,自引:0,他引:1
K. Knothe S. Stichel 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1994,23(1):237-251
In this paper creep-forces and creepages for an ICE express train coach and an electric locomotive BR 120 of the DB on straight track with random irregularities are investigated. The calculations are made with the multibody program MEDYNA using direct covariance analysis. One of the aims of this article is to emphasize the advantages of the direct covariance method (time domain) compared with the power spectral density method (frequency domain). 相似文献
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