以带宽分别为19 mm和25 mm的ZA型汽车同步带为研究对象,理论分析了带宽对汽车同步带振动噪声的影响。建立了有限元分析模型,分析了其横向振动固频特性和在啮合冲击激励作用下的谐响应特性;并以谐响应分析得到的同步带表面振动位移为边界条件,采用声场封闭的直接边界元法建立了汽车同步带的声学仿真模型,对汽车同步带的辐射噪声进行仿真分析,得到了两不同带宽的同步带的声场声压云图及辐射声压的频响曲线,并研究了带宽对同步带辐射噪声的影响规律。 Taking the ZA type vehicle timing belt with 19 mm and 25 mm bandwidth respectively as the research object, the influence of the bandwidth on the vibration noise of the automobile timing belt is analyzed theoretically. The finite element analysis model is established and its transverse vibrational frequency-fixed characteristics and the harmonic response characteristics under meshing impact excitation are analyzed. Based on the harmonic response analysis, the vibrational displacement of the surface of the belt is taken as the boundary condition. The direct boundary element The acoustic simulation model of automobile timing belt is established and the radiated noise of the automobile timing belt is simulated and analyzed. The sound pressure curve and radiation response curve of the belt with two different bandwidths are obtained. The effects of bandwidth on synchronization Effect of radiation with noise.