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- W52693038 abstract "A mobility function is a transfer function relating the complex amplitude of vibratory response velocity at some point on a structural component to the complex amplitude of an excitation applied at any point on the same component. The vibratory response can be either a translational or a rotational velocity, and the excitation can be either a force or a moment. Rotational mobilities, i.e., those involving rotational velocities and/or moments, are needed for assemblages in which rotational interactions among the components are important. This study deals with the experimental determination of such mobilities. Previous investigators have approached the difficult task of experimentally measuring rotational mobilities with the use of special fixturing attached to the components. It is shown here that rotational mobilities of structures are equivalent to spatial derivatives of their translational mobilities. The method of finite differences is adapted to the approximation of these derivatives. By this method the rotational mobilities are derived from sets of conventionally measured translational mobilities, eliminating the need for special fixturing. This approach to determining rotational mobilities is demonstrated in a set of experiments on a free-free beam. Good agreement is obtained between experimentally and theoretically generated versions of two rotational velocity/force mobilities. An experimentallymore » derived rotational velocity/moment mobility is found to give reasonably good indications of resonances but exhibits large amounts of scatter in some frequency bands. This scatter is attributed to the subtraction of translational mobility quantities which are nearly equal in magnitude. Further investigation is needed to determine an effective method of smoothing the translational mobility data before the differencing calculations to eliminate this scatter.« less" @default.
- W52693038 created "2016-06-24" @default.
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- W52693038 date "1980-09-01" @default.
- W52693038 modified "2023-10-10" @default.
- W52693038 title "Method for experimentally determining rotational mobilities of structures" @default.
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