EVU XXV 2016 – 13 Influence of bad balancing front wheel on steering system and car body vibrations

Influence of bad balancing front wheel
on steering system and car body vibrations
Robert Janczur
Cracov University of Technology


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.

La lettura di questo articolo è riservata ai soli Soci EVU Italia


AutoreRobert Janczur Cracov University of Technology
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