Estimation and Measurement of the Sound Power Radiated from a Circular Plate with a Solid Shaft and a Solid Cylinder. 2nd Report. Estimation and Measurement of Sound Radiation Power.

In this paper we describe the estimation result of sound power radiated from a circular plate with a solid shaft and a solid cylinder, which is a simple model of an aircraft gear blank and is excited axially, radially or three dimensionally. The three parameters for estimation, the radiation loss factor, the driving point mobility and the total loss factor, were calculated according to the formulae derived in the first paper. Using these calculated parameters and measured excitation force spectrums, the sound powers radiated due to the excitations were estimated and compared to the measured values obtained by means of the sound intensity method. The estimated frequency spectrums of sound radiation power coincided with the measured values. Consequently, the estimation theory and the associated formulae are valid.