平歯車の空力音の放射挙動 : 相似則と音源部位の推定

抄録

Tooth mesh frequency sound generated aerodynamically at the region of meshing was investigated to find out a genaral characteristis of the sound emissioin as well as its detailed source locations. Sound pressure response measurement for various facewidth revealed that emission is expressed in terms of a similarity law as a function of a parameter b/λ, the ratio of facewidth to the wavelength of the sound. The effect of dimensions such as module, number of teeth were derived by means of a dimensional analysis with respect to a pumping action of the cavity between driving and driven gears. Throughout several kinds of experiments, one source is located at the middle of the exit of meshing, which becomes prominent ad the axial air fiow reaches to a certain speed. Another source is estimated to spread over both face ends, whose radiation characteristics are closely related to the distribution and the solid boundary of the gear pair.