String Testing

String testing with all the unit coupled together will verify the system response. Individual unit testing may not always give a true result because this may be affected by the test driver characteristic. However, the unit response is affected only by the moment transfer across the couplings. The moment transfer factor can be verified by deliberate unbalance of the test driver hub end and by noting the vibration response at each bearing of the compressor. The rotor response to deliberate unbalance at the compressor shaft hub must also be measured to compare the effects.

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