耦合条件下单层微穿孔板吸声体的消声性能研究

本文提出了一个板-腔耦合的模型,用于计算微穿孔板对腔体的消声性能.微穿孔板一般为较薄的平板,在板的面积较大时,板自身的振动也可能会对腔体的声场造成影响.该模型考虑了微穿孔板的影响,能够更精确地计算微穿孔板吸声体的消声性能.使用噪声消减量来评价微穿孔板的消声性能,通过实验验证,该耦合模型的求解结果精确可靠.基于所提出的计算模型,对微穿孔板的穿孔率、背腔厚度、孔径以及板厚进行了优化.

Study on the Performance of Micro-perforated Plate Absorber under Coupling

A plate-cavity coupling model was proposed to calculate the acoustic attenuation perfor-mance of a micro-perforated plate on the cavity. The micro-perforated plate is generally a relatively thin plate, when the area of the plate is large, the vibration of the plate itself may also affect the sound field of the cavity. The model considers the influence of the micro-perforated plate and can more accu-rately calculate the noise reduction performance of the acoustic absorber of the micro-perforated plate . The noise reduction performance of the micro-perforated plate was evaluated using the Noise Reduc-tion (NR). The experimental results show that the coupling model is accurate and reliable. Based on the proposed calculation model, the perforation rate, the back cavity thickness, the aperture and the plate thickness of the micro-perforated plate were optimized.