一、前言对于涡轮机和压气机等回转机械,为了提高每一机组的性能,要求采取高速和长跨距轴承。另外,为了提高整个装置的性能和降低制造成本,常常使用刚性联轴节直接把数台机械串联起来。由于这些要求已使回转机械的运转速度大大超过轴系总体的一次临界转速,所以在运转速度范围内跨着多个临界转速,同时也易发生润滑油起泡等自激振动。因此在回转机械的设计阶段定量地计算轴和轴承系统的振动特性已成为一个非常重要的研究课题。毫无疑问,回转机械的振动不只是轴和轴承系统的问题,另外,即使是轴和轴承系统的振动,仍然还有各种问题。本文叙 I. Preface For turbomachinery and compressor rotary machinery, in order to improve the performance of each unit requires the use of high-speed and long-span bearings. In addition, in order to improve overall device performance and reduce manufacturing costs, it is common to use rigid couplings to directly connect several machines in series. Since these requirements have made the operating speed of rotary machines greatly exceed the critical critical speed of the entire shaft system, self-excited vibration such as foaming of the lubricating oil is likely to occur across a plurality of critical speeds in the operating speed range. Therefore, the quantitative calculation of the vibration characteristics of the shaft and bearing system in the design stage of the rotary machine has become a very important research topic. Undoubtedly, the vibration of rotary machines is not only a problem of the shaft and bearing system, in addition, there are still various problems even if the shaft and the bearing system vibrate. This article Syria