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Torsional Critical Speeds for variable speed trains

Torsional Critical Speeds for variable speed trains

Torsional Critical Speeds for variable speed trains

(OP)
Hello,

Could you please give some recommendations on the following questions:

For variable speed compressor train rated approx. 6 MW power which has two casings - does it make sense to make torsional measurements of critical speeds during mechanical running test or performance test ? Because what would you measure then without accounting for electrical excitations which come from the Motor and converter system ?

In other words, I am guessing that it would only make sense to measure the torsional critical speeds with the complete string either at when the train is commissioned at site or during a special test with complete unit including all the electrical components and eventually at rated torque. Without doing that I would have to blindly rely on the torsional study made by compressor Vendor which sounds not good.

Is this thinking correct ? Could you please share how do you approach these issues from your experience standpoint ?

Thanks

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