Abstract
Noise and vibration problem likely happens after assembly even every element is manufactured under low vibration design. Therefore it is helpful if vibration measurement can point out the actual geometrical situation concerning such alignment information like bearing pattern between teeth, or relationship between mating tooth surface forms. Present paper tries to extract accurate waveform from vibration measurement by the aid of synchronous averaging and Fourier analysis. Provided several driving helical gears having identical nominal dimensions but different tooth surface modifications, measurements were done by mating with an unique driven helical gear. Signal were averaged synchronous with shaft rotation, and then Fourier coefficients were calculated. Next mesh harmonic components have been normalized with respect to mesh fundamental component, and are shown as named polar plots that represent particular tendency against loading condition. The results clearly suggests it is applicable to diagnose a faulty gear system.
