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Torsional modeling of reciprocating machinery systems is critical to the reliability of the installation. Differences in construction, error in manufacturer information or other variables can, and occasionally do, prevent the prediction from matching reality. This has lead to major failures and lost production. This paper examines the variables that can affect the accuracy of torsional modeling: differences in crankshaft data when calculated with industry-related standard techniques and finite element analysis, electric motor rotor stiffness, coupling installation, and reciprocating compressor loading and performance. Finally, a case history where “twin” units have distinctively different torsional vibration is presented. One unit had electric motor rotor and shaft failures, while the other unit has not had any torsional failures. Did the “good twin” have a failure that prevented catastrophic shut down?
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