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在1976年初,高压液氢涡轮泵的次同步旋转问题使航天飞机主发动机的工作拖延了好几个月的时间。成功地解决这个问题的方法对转子动力学的研究单位是特别感兴趣的,这不仅是因为该种机械有众所周知的最高的功率重量比(77000马力…760磅),而且还由于它包括了多种外力作用的缘故。这些方法(包括分析和试验两个方面)已用来分离变量,寻求满意的解,以及估价其结果。本文介绍了识别基本特性、分析数据和进行计算机研究的一般方法。讨论了分析和试验的结果。因为次同步旋转在高于两倍系统第一临界转速下开始出现,所以通过加强轴和轴承座的刚性就提高了出现旋转的轴转速;利用合适的级间密封,又能使系统的阻尼和系统的刚性增加到使不稳定的门限目前超过工作范围。文中所做的评述可能有助于其它从事高速、高功率转动机械的设计者。
In early 1976, the issue of subsynchronous rotation of high-pressure liquid-hydrogen turbo pumps delayed the operation of the space shuttle main engine for several months. The successful solution to this problem is of particular interest to rotor dynamics research units not only because of the highest known power-to-weight ratio (77,000 horsepower ... 760 lbs.) But also because it includes more The role of external forces. These methods (both analytic and experimental) have been used to separate variables, find satisfactory solutions, and evaluate their results. This article describes the general methods of identifying basic characteristics, analyzing data, and conducting computer research. The results of the analysis and testing are discussed. Because subsynchronous rotation begins to occur at speeds above twice the system’s first critical speed, rotating shaft speeds are increased by stiffening the shaft and housing; the use of a suitable interstage seal allows the system’s damping and The rigidity of the system is increased so that the instability threshold currently exceeds the operating range. The comments made in this article may be of interest to other designers of high-speed, high-power rotating machinery.