Research on structure, propagation and exposure to general vibration in passenger car for different damping parameters

The article addresses results of the research on the structure and propagation of vibration of vehicle for different parameters of suspension damping system. Long term exposure to whole-body vibration in transport may cause health risk and many diseases. Suspension is the most important system of vehicle for vibration control of level of wave emission to car-body and passengers. Thus the research on structure and propagation of vibration were conducted for different damping parameters of shock absorbers. For the sake of the analysis of exposure to whole-body vibration signals of general vibration were recorded at locations where vibration penetrated the human organism by the feet inside the vehicle. The vibrations have to be analyzed in the domains of amplitudes, time, frequency and time-frequency. Chosen estimators were defined and compared for the sake of the analysis of vibration propagation in terms of energy and dynamics. To evaluate the exposure to vibration it is important to analyse the dynamics of phenomena and main frequency components of vibration. For the spine response in vertical direction calculation of the model presented in ISO 2631 was used. The calculations of acceleration dose and equivalent static compressive stress for the assessment of health effects were done. Due to the large capacity of information in vibration signal the scope of presented research can be used for active diagnostics experiments on determining of estimators of technical condition of suspension elements.