Conference_programme: 19: Sound propagation
Lecture: A new estimation method for acoustic transmission using a small loudspeaker and an acoustic particle velocity sensor
Author(s): Yamamoto Katsuya, Asahina Mineyuki, Suzuki Kazuhiro
Summary:
Against a noise problem, it is important to comprehend acoustic characteristics at a receiver point that is emitted from the noise source. The acoustic characteristics at a receiver point in any space is composed　of multiplications of an acoustic particle velocity on a noise source and the acoustic transfer function between a small region on the noise source and the receiver point. As acoustic particle velocities are generally calculated by the integration of the acceleration on noise sources, a new sensor which directly measures acoustic particle velocities (acoustic particle velocity sensor) has been developed. Moreover, while the transfer function is commonly gained based on the reciprocity theorem that uses a sound from a loudspeaker at a receiver point, it is concerned that the loudspeaker exerts an influence on the acoustic characteristics around the receiver point.\n To tackle the above issue, we have developed a new method to comprehend acoustic characteristics in any space using an acoustic particle velocity sensor and a small loudspeaker. In this method, the acoustic particle velocity is measured by the new sensor, and the transfer function, which is a frequency response function, is gained from the sound of the small loudspeaker on the noise source as an emitted noise of a small region. We carried out a verification test with the noise from a speaker-mounted box. As a result, the frequency characteristics of the sound pressure with this new method were found to be quite similar to the actual measured characteristics.\nThis paper describes the fundamental method to estimate the acoustic transmission characteristics and the result of our verification test. Furthermore, we have demonstrated the contribution ratio of the noise source to the sound pressure at a receiver point on the premise that the sound pressure is dealt with as a vector and complex number.\n
Corresponding author
Name: Dr Katsuya Yamamoto
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Country: Japan
