基于动力学的发动机正时皮带怠速噪声仿真分析及试验研究

Dynamic Simulation and Experiment of Engine Timing Belt Noise at Idle

以某3缸增压直喷汽油机正时皮带怠速低频噪声为研究对象,通过试验锁定噪声源和噪声频段,并对该噪声产生机理进行分析。针对该噪声源和噪声频段,通过一维动力学仿真的方法来优化正时皮带系统的布置参数,寻找到降低该噪声的方法,并最终通过噪声振动平顺性(NVH)试验验证了提高皮带刚度和增加小惰轮的方案能够有效降低该噪声。

The low-frequency noise of the timing belt of a three-cylinder turbocharged direct injection gasoline engine at idle speed was studied.The noise source and noise frequency spectrum were derived by test.The mechanism of noise generation was also analyzed.According to the obtained noise source and spectrum,the layout parameters of the timing belt system were optimized by the one-dimensional dynamic simulation.The method to reduce the noise was worked out and verified by noise vibration and harshness test.It is to increase the stiffness of the timing belt and add an idler.