Abstract
Keywords: truck, vibration, longitudinal acceleration
The experimental research of longitudinal vibration was performed on a heavy truck of 19t (vehicle FAP) overall weight, which was suitable for wheel formula variation (4x4 and 4x2), with the minimal impact on vehicle dynamic parameters.
The major goal of the experimental part of the research was to explore the influence of the truck design concept on the level of longitudinal vibration, since it already has been determined that the levels of longitudinal accelerations on the driver´s seat and on the vehicle frame show significant differences. In that sense, the appropriate program of test investigation has been designed to be the basis for comparison of the most influential parameters.
The choice of variables to be measured has been made according to the capabilities of each of them to represent the processes that occur in flexibly suspended truck cab. The processing of test results was performed in such a way to enable the comparison among the experimentally gained results and those calculated in the wide range of frequencies being of interest from the aspect of ride comfort. However, when processing the results, a special attention has been paid to the analysis of shunt variation of engine torque, being a basic cause of vibration in the frequency domain up to 5 Hz (Corbridge,1986, Linden,2003), in which humans are especially sensitive.