Author(s)

T.H. Hodgson & D.H. Chun

Abstract

The boundary element method is used to model the impact transient noise radiation from a C- frame punch press. From the measured input force-time history, calculations of the surface velocity, surface pressure and then the resulting sound power spectrum at 3m distance were made. The results compared favorably with measurements and demonstrated that most of the sound power was radiated from the energy in non-resonant free-running waves in the press C-frame. This suggests that the use of constrained layer damping methods would be a good re-design technique for punch-press noise reduction. 1 Introduction There has been an interest in transient impact noise, such as from wood cutting blades, textile and metal forming machinery at the NCSU Center for Sound and Vibr

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