Case Study: Torsional Analysis - Investigation of torsional influence on vibrations of motor-driven reciprocating gas compressor

摘要

Most turbo and reciprocating machines operate over a wide range of speeds. Some of these speeds can coincide with lateral or torsional resonant frequencies (aka critical speeds) of their shafts. Operating at these critical speeds can be damaging to the machine or its seals and bearings, and must be avoided. Thus, it is important to be able to accurately predict critical speeds of a machine prior to installation in the field. This is especially true for reciprocating machines that are subject to high-amplitude, low-frequency excitations from the cylinders of either the engine driver or the driven compressor. Excessive torsional vibrations have led to coupling breakages and sometimes can interact with lateral vibrations resulting in catastrophic shaft failures.