Improving Vehicle Vibration Behavior via Structural Modification with Random Road Input

The aim of this research is the modification of frequency response of transmitted vibration to vehicle body via alternating the geometry of vehicle structural components. For this purpose after transmitting the FE model of vehicle body into ADAMS software and building full vehicle model, mode shapes, natural frequencies and transmitted vibration to the vehicle cabin in sensitive points were obtained. It has been shown that changing the engine ram geometry and adding strengthening components, not only affect the natural frequencies of vehicle body but also could modify the natural frequencies of full vehicle model. The result of using random road input demonstrates that the amplitude of the vibration transmitted to the vehicle cabin in modified model is decreased.