关键词: 怠速振动；悬置隔振；能量解耦；遗传算法

Abstract: The powertrain mounting system is a key factor affecting the vibration response in the vehicle and is an important part of the noise, vibration, harshness (NVH) performance tuning. In order to study the problem of excessive idle vibration of the steering wheel during the subjective evaluation of a pickup truck, it is found that the powertrain excitation could not be effectively attenuated due to the insufficient vibration isolation capacity of the powertrain mount, which caused the excessive vibration of the steering wheel. To solve this problem, the powertrain mounting system of the sample vehicle is developed and the decoupling rate is taken as the optimization goal, based on the non-dominated sorting genetic algorithm (NSGA-II) optimization algorithm and energy decoupling method, iSIGHT and MATLAB are used to carry out co-simulation. The vibration isolation performance of the engine mount is optimized, and the optimization verification is carried out in combination with the real vehicle, and the vibration isolation of the optimized rear suspension system basically reached 20 dB, and the subjective evaluation of steering wheel vibration is acceptable. This research method has certain guiding significance for the development of NVH of prototype vehicles.

Key words: Idle vibration; Suspension vibration isolation; Energy decoupling; Genetic algorithms