Hello everybody 1. when do we need

[Hesam267]

Hello everybody
1. when do we need high speed balance exactly in industry?
2. is it possible a balanced rotor in 40000 rpm (above second critical speed), show unbalance in 3000 rpm balance machine؟

 

[GregLocock]

2 you can't reliably balance for high speed operation (defined as more than 1/2 the first critical, for the sake of argument) in a low speed machine. The reason is that a low speed machine assumes that the shaft is rigid, which of course it won't be above 2nd critical.

Cheers

Greg Locock


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