Acoustic attenuation performance of a perforated resonator with a multi-chamber and its optimal design

Abstract

A perforated resonator can attenuate the broadband noise generated by the air intake system of a turbocharged engine. This paper mainly focuses on the sound transmission theory of a perforated resonator with a multi-chamber. The numerical decoupling method for a perforated resonator with a single chamber is extended to a perforated resonator with a multi-chamber in order to calculate the transmission loss. To verify the modified algorithm, a two-microphone method is adopted to measure the transmission loss of the resonator. The measurement uncertainty of the experiment is discussed further. The experimental and analytical results on the resonator are presented, and good agreement is found. To determine the optimal structural parameters of the resonator in order to match the given target, a modified algorithm obtained by using the non-linear least-squares method is proposed for the resonator, and a detailed analysis of the selection of the design variables and optimization modes with different design variables is carried out. The optimized results show that all optimization modes can meet the target curve. Therefore, it provides multiple solutions for researchers to determine flexibly the best solution. Finally, a robustness analysis is carried out to show that the variations in the structural parameters have little effect on the transmission loss. It is expected that the research methods and conclusions of the study can provide theoretical support and application guidance for the sound design of a turbocharged engine air intake system.