An estimation method for acoustic transmission using piezoelectric loudspeaker and acoustic particle velocity sensor

Abstract

Against a noise problem, it is important to comprehend the acoustic characteristics at a receive point that transmitted from the noise source. The acoustic characteristics at any point is expressed by the acoustic particle velocity on the noise source and Green function. Although the acoustic particle velocity has calculated by the integration of the acceleration on the noise source and Green function has gained based on the reciprocity theorem, we propose a method using a piezoelectric loudspeaker and acoustic particle velocity sensor. The acoustic particle velocity is directly measured by the sensor, and the Green function, which is a frequency response function, is gained by the emission noise from a piezoelectric loudspeaker on the noise source. This paper describes the fundamental method to estimate the acoustic transmission characteristics and a result of a verification test. Furthermore, we demonstrate the contribution ratio of the noise sources to the sound pressure at receive point on the premise that the sound pressure is dealt with as the vector and complex number.