The Effects of Stingers on Receptance Function Measurements

[+] Author and Article Information
Jyh-Chiang Lee

Chung Shan Institute of Science and Technology, Lung-Tan, Taiwan, Republic of China

Yuan-Fang Chou

Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan, Republic of China

J. Vib. Acoust 118(2), 220-226 (Apr 01, 1996) (7 pages) doi:10.1115/1.2889652 History: Received April 01, 1993; Revised July 01, 1994; Online February 26, 2008


When using a shaker to conduct receptance function measurements, it is usual to put a stinger between the shaker and a force transducer that is attached to a test structure. Ideally, a stinger can transmit desired axial force to excite the structure and isolate excitations in all other DOFs in order not to bias the testing results. The selections of stingers were made by trial-and-error, by chance, or by experience. This may cause test errors especially when the magnitude of receptance function of the excitation system is significant compared with that of the structural system at the correspondent frequency. In this work, substructure synthesis algorithm was used to calculate the effects of stingers on the receptance function measurements. The dynamic characteristics of a shaker, a shaker suspension system, a stinger, and a test structure were considered in the analysis. If the shaker is fixed, the method can predict the effects of the stinger on measured receptance functions. Finally, a cantilever beam and seven different sizes of stingers were used to verify this method. Good agreements were found between the predictions and testing results.

Copyright © 1996 by The American Society of Mechanical Engineers
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