Abstract
This paper describes a noise reduction design of transient sound radiating from a thin plate structure excited by random impact forces. The overall sound power of a coin storage box of a coin counting machine is set as an objective function to be decreased. The location and size of dimples adding on the box are set as design variables and are optimized with the sequential quadratic programming method. The sound power radiating from a box with optimum dimples reduces by 3.0dB. It is then confirmed that the proposed method is effective and useful for reduction of random transient sound.
