Papers by Keyword: Idling

Abstract: To investigate the main vibration source which caused the serious vibration in passenger ride area of one type bus under its engine’s idling status, the effect of isolated vibration and energy transfer characteristics of the engine mounting block are tested and analyzed by modern signal processing technology in this paper. By the measurement of the acceleration response signals of engine’s exciting points and the fixed points of engine’s mounting on its chassis, the transfer function of engine’s mounting block under engine’s idling status was obtained. The calculation and analyzed results draw a conclusion that: the stiffness of the engine’s front mounting is too hard, and the vibration of the engine in idling status was amplified obviously. And then the harshness of the studied bus could be improved according to this conclusion.

Abstract: In this paper, the theory of DR (Delayed Resonator) is employed to investigate the vibration of vehicles, for the first time, and the process to suppress the vibration transmission from the engine to the body using the DR is explored. A simplified half-car model with DR is built for the case of idling, and the critical time delay is obtained by analyzing the stability of the model, additionally, the different effect of the parameters on the stable region is investigated. Method of solving the optimum values of the gain and the delay for maximum vibration suppression is built, afterwards numerical emulation is carried out to check the effect and to compare with the hydraulic engine mount. The results show that the amplitude of the body can be reduced more effectively.