歯車の偏心誤差と騒音スペクトル

抄録

The characteristic of the tooth-meshing noise spectrum is described by using the concept of modulation. In actual noise spectrum of gears with eccentric errors, a large number of sidebands appear on both sides of the tooth-meshing frequency. From the appearance of these sidebands, it is known that the tooth-meshing noise is subjected to modulations. The sideband level of amplitude modulation or frequency modulation is known to be symmetric about the tooth-meshing frequency but the level of sidebands of actual meshing noise is asymmetric. It is shown by theoretical analysis and experimental results that the asymmetry occurs in the case where the tooth-meshing noise is subjected to both amplitude modulation and frequency modulation at the same time. The relation of the coefficient of modulation, which is one of the parameters deciding the sideband level, with both the amount of eccentricity of gears and the reduction ratio is given theoretically.