Estimation of the Pressure of Structureborne Sound Radiated by an Enclosure : Estimation Based upon Multipoint Excitation

Abstract

This paper proposes a method for estimating the sound pressure of structureborne sound included in noise radiated by an enclosure housing a machine that produces both noise and vibration. In this method, estimation is carried out without any change in the condition of installation of the machine using acceleration measured when the machine is in operation and frequency-response functions determined when the machine is not in its operation. First, the theory of this method is briefly introduced. The frequency-response functions are determined by exciting multiple points on a machine housed in an enclosure. Then this method is tested using an experimental setup in which the enclosure is housing an excitor and a speaker. It is shown that the estimated results agree well with the measured results. Finally, the error in the estimation is discussed.