Impact Force Prediction Using Measured Frequency Response Functions

Abstract

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.