Noise analysis in Gear Box

[kashyap]

Why noise anaysis is preferred in Gear-box as compared to vibration anaysis?

if the above question isn't correct, then i would like to know when noise analysis is preferred to vibration analysis?

 

[GregLocock]

Because

(1)the customer hears noise, doesn't feel vibration

(2) at the frequency of interest typically problems are acoustically transmitted, not structurally

(3) it is a lot easier to measure noise than to measure vibration, and then calculate the noise from that.

any other suggestions? Cheers

Greg Locock