The critical speeds of twisting vibration of multiple rotor-bearing system connected by coupling are often low.Some critical speeds are close to the working speeds.

• 摘要由联轴器联结的多跨转子-轴承系统，整个轴系的扭转振动临界转速较低，为避免在工作转速范围内，常需要计算和进行结构修改。