汽轮发电机组现场动平衡前的故障诊断

Diagnostics of Turbine Machines Prior to Field Balancing

在现场用动平衡的办法来处理机组大振幅振动时 ,有时用常规的办法来确定平衡重量和位置 ,可能不能取得十分满意的结果。究其原因 ,主要有两个方面的因素影响着平衡的效果 :不平衡激振力的本质 ,以及机组本身或其支撑系统存在的缺陷改变了机组的振动特性。对不平衡激振力的本质进行了分析 ,同时也介绍了诊断机组及其支撑系统缺陷方法 ,可以为工程技术人员进行汽轮发电机组现场动平衡时借鉴。

In field balancing machines with high vibrations, the use of common methods of determining balance weights often does not yield satisfactory results. An analysis of the reasons for this shows that there are two main groups of constraints on the balancing efficiency: the forces of different nature from simple unbalance that excite vibration at the rotation frequency and the existence of certain defects in the machine that can change the mechanical properties of the machine. The nature of these forces and the methods for the detection of defects of machine units and its base supports that can be used by experts in balancing are discussed.