ABSTRACT
There are several new rotating machinery products on the horizon for industrial and consumer applications, such as in the power generation and automotive sectors, that will run at considerably higher rotational speeds than their present forebears (to 100,000 rpm and above). Design solutions for next-generation high-speed rotating machinery will necessitate some fundamental research and development to more accurately quantify just how much vibration can be continuously endured by a given machine through its lifetime. The quite approximate upper limits provided by contemporary guidelines will probably be unacceptably too conservative or otherwise not applicable to next-generation high-speed rotat-
1. CASING AND BEARING CAP VIBRATION DISPLACEMENT GUIDELINES
The first rotating machinery vibration severity guidelines widely used in the United States are generally credited to T. C. Rathbone (6). His guidelines grew out of his experience as an insurance inspector on low-speed machines having shaftto-housing vibration amplitude ratios typically in the range of 2 to 3. His chart and subsequent versions of it by others are based on machine casing or bearing cap vibration levels, such as illustrated by the accelerometers on the turbogenerator in Fig. 10 and the hand-held analyzer in Fig. 14 of Chapter 7.
