Impact Force Prediction Using Measured Frequency Response Functions

[+] Author and Article Information
R. J. Thornhill

International Business Machines Corporation, 11400 Burnet Road, Austin, Texas 78758

C. C. Smith

Department of Mechanical Engineering, Brigham Young University, Provo, Utah 84602

J. Dyn. Sys., Meas., Control 105(4), 227-231 (Dec 01, 1983) (5 pages) doi:10.1115/1.3140663 History: Received April 07, 1981; Online July 21, 2009


A method is presented for predicting impact forces using measured frequency response functions when an ideal mass elastically impacts a stationary structure. It is shown that a frequency response function measured at the point of impact on the structure together with the impactor’s mass and velocity can be used to form a function which, after inverse Fourier transformation yields the predicted force. After the basic equation is developed, predicted and measured force pulses are compared for a steel missile impacting an aluminum casting. The limitations of the method due to hardware and experimental technique are also discussed.

Copyright © 1983 by ASME
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