Abstract
This paper describes experiments designed to measure the spectrum of the vibratory energy injected into structures by impacts. It is felt that if the techniques prove to be feasible, the information provided might be useful in efforts to reduce the noise generated by impact-preducing machines. Two techniques are described. The first requires measurements of the reverberation time of the impacted structure, and of the energy spectrum of the transient acceleration of the structure in response to the impact, observed at many points on the structure. The second requires only a single impact response measurement, and a single measurement of the steady-state response to a steady-state excitation at the impact point. These experimental methods are tested using the impact of a small steel sphere against a large, thin free-free plate. A simple theoretical expression for the spectrum of the injected energy is available for this case. The experimental results are compared to the theoretical prediction.
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