An Experimental Study of Vehicle 1st Order Vibration Improvement at Engine Idle

Abstract

An experimental study of the 1st order vibration improvement at engine idle condition of a malfunctional vehicle in development is presented in this work. Firstly, the generation mechanism of the vehicle 1st order vibration problem at engine idle is analyzed based on theoretical analysis. Then, experiments are designed to derive the possible vibration excitation source and transfer path through comprehensive analysis. The powertrain rotational system imbalance exceeding a limit is determined to be the main reason for the vehicle 1st order abnormal vibration. The resonance of the mounting system excited by the powertrain rotational system intensifies the 1st order abnormal vibration. Experimental analyses show that the clutch imbalance severely exceeds the prescribed limit, which confirms the diagnosis of the excitation source, and a significant improvement of about 87% of the 1st order vibration can be achieved by adjusting the clutch imbalance.

Idle Vibration Reduction of a Diesel Sport Utility Vehicle

“…Fu et al [3] proposed a hybrid proportional electromagnetic dynamic vibration absorber comprising an electromagnetic actuator and an elastic element to control the engine vibration during idling. Moreover, Shen et al [4] presented an experimental study on the first-order vibration improvement of a malfunctioning vehicle in development during the engine idle condition. They analyzed the generation mechanism of the first-order vibration problem during engine idling, and subsequently, experimentally derived the possible vibration excitation source and transfer path.…”

“…By using design variables related to the radiator and intercooler, design optimization was performed to reduce the idle vibration on the driver's seat, and the idle vibration was reduced by 9 dB through the optimization. 4.…”