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- W2330999743 abstract "Modal testing to extract system natural frequencies and mode shapes has always been a somewhat trial and error proposition, with initial exciter locations being determined by a combination of experience, intuition, accessibility, some analytical analysis, and luck. If the initial exciter selections failed to separate the required responses, a shotgun approach was usually employed until either test time expired or all desired modes and frequencies were finally found. However, there is a relatively convenient and easily applied method, utilizing acceleration transfer function data, that will provide the modal test analyst with a pre-test selection of exciter locations that will adequately drive the test structure to obtain the desired mode shapes and frequencies of the system. In addition, each analytically selected exciter location can be compared or rated against the other possible selections to determine how well it excites a given mode shape. Further, since acceleration transfer functions can be directly related to expected test accelerometer output, it is possible to provide the test conductor with a set of abort channel accelerometer locations and magnitudes based on the maximum desired test levels. The method itself involves creation of a three-dimensional summary matrix of qualified peak acceleration levels, based on selection criteria presented. This matrix is then viewed from various axes to provide two dimensional summary arrays that simplify exciter selection. The topics discussed in the paper are applicable to virtually any type of modal test, and can be implemented on a computer. --------------* Staff Engineer, Analytical Mechanics Section ** Senior Engineer, Analytical Mechanics Section Member AIAA David N. Kopec*" @default.
- W2330999743 created "2016-06-24" @default.
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- W2330999743 date "1984-05-14" @default.
- W2330999743 modified "2023-09-24" @default.
- W2330999743 title "Selection and evaluation of optimum exciter locations for modal testing via automated acceleration transfer function analysis" @default.
- W2330999743 doi "https://doi.org/10.2514/6.1984-996" @default.
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