4. Acoustic analysis of suction housing via boundary element method
Through the work described above, the overall noise of the suction housing was attributed to a number of parts, rather than to a single part. Based on this finding, the shape of the silencer was optimally designed to reduce the noise in the exhaust pipe. But
to reduce the intrinsic noise, further studies were needed on noise sources. The locations where the most noise was generated were found to be the exhaust pipe, the motor, and the impeller area. The use of a low-noise motor to reduce the motor noise was identified
as a noise reduction strategy, as well as a reduction in the number of blades to alter the BPF. Thus, this study proposed a noise reduction strategy through BEM-based acoustic analysis of the impeller area of the suction housing.