Crash Tests
Main AuthorRobert Janczur
Type of Mediapdf-document
Publication Typelecture
Publication Year2016
Publisher25. EVU Congress, Bratislava

The aim of the article is to present the results of road tests of car VW Passat equipped with tires of size 195/65 R15, on the influence of the unbalancing front wheel on vibration of the parts of steering system, steering wheel and the car body. Unbalances wheels made using weights of different masses, placed close to the outside of the steel rim and checked on the machine Hunter GSP 9700 for balancing wheels. The recorded waveforms vibration steering components and car body, at different constant driving speeds, subjected to spectral analysis to determine the possibility of identifying vibration frequency caused by unbalanced wheel in various states and coming from good quality asphalt road surface. The results were discussed in terms of the possibility of identifying the state of unbalancing wheels and possible changes in radial stiffness of the tire vibration transmitted through the system driving wheel on the steering wheel. The proposed method of recording and analyzing vertical acceleration including the vibrations in the longitudinal direction, can be also used to identify the pulse braking forces, e.g., caused by improper shape of brake disc. The knowledge of the actual acceleration chassis elements of vehicle and velocity on the basis of data from the CAN bus, allow the development of a software analysing the data and forming monitor abnormal states of tires or improper effect wear of brake discs. This monitor can help to increase the stability of the suspension of the car wheels and durability of tires and to maintain an optimal driving comfort.

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