Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : June 24, 2020 - June 26, 2020
In this paper, we indicate the probability of the sound attenuation effects in the area for the radiated sound from the engine. Nowadays, the attenuation of the airplane noise is need. In this research, we consider the radiated sound from the engine fixed at the ground. This is assuming the taking off and landing noise. At first, we indicate the sound attenuation effect in the area is achieved for the selected lobe mode by using the eight speakers and the eight microphones with the numerical simulation. In case the distance between speakers and microphone is long, the attenuation effect over 6 dB in the backward area of the microphones is verified. Second we indicate the sound attenuation of each microphone are achieved by using the recorded sound radiated from the engine. In case the distance between speakers and microphone is short, the attenuation effect from 5 dB to 10 dB at almost all microphones is verified. From these simulation results, we verified the probability of the sound attenuation effects in the area for the radiated sound from the engine.
