科研之友
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摘要
Mufflers are incorporated into continuous positive airway pressure (CPAP) devices to reduce noise in the air paths to and from the flow generating fan. The mufflers are very small, irregularly shaped, and are required to attenuate noise up to 10kHz. It is important that the acoustic performance of these mufflers is reliably predicted and optimised, in order to improve the user experience and maximise compliance with the CPAP therapy. In this study, the acoustic performance of three reactive muffler designs similar to those used in CPAP devices is presented. Transmission loss predictions obtained using analytical and finite element methods are compared with experimental data measured using a test rig based on the two-microphone acoustic pulse method. The analytical methods were found to be unsuitable for predicting the transmission loss of CPAP muffler designs due to the complexity of the muffler geometries. Good agreement between the finite element and experimental results were obtained.
- 出版日期2010-4
