分布式通风隔声罩的设计和效果研究

针对动力设备同时满足降噪和散热的需求，提出一种周期分布式结构的通风隔声罩。隔声罩的罩壁内嵌通风消声单元，声波衰减的同时，气流可顺利通过罩壁进行耗散。介绍了分布式通风隔声罩的设计，并对其隔声性能进行了理论计算。通过分布式通风隔声罩对三种不同设备的插入损失分别进行了实际测量和分析。研究结果表明，在通过频率以上，隔声罩插入损失的计算值和实测值吻合较好，分布式通风隔声罩在其通过频率以上具有良好的隔声效果。该分布式通风隔声罩的有效降噪频率可根据不同声源的频率特性进行专一设计，适用于各种需要通风散热的设备的隔声。

Design and effect analysis of the distributed ventilation and sound insulation shield

In order to meet the requirements of noise reduction and heat dissipation for power equipment, a ventilated sound insulation shield with a periodic distributed structure is proposed. Many ventilation and noise elimination units are embedded in the plate of the sound insulation shield. While sound wave attenuates, the airflow can be dissipated smoothly through the shield plate. The design of the distributed ventilation sound insulation shield is introduced, and its sound insulation performance is analyzed by theory. The inserted sound losses of the distributed ventilation and sound insulation shield for three different devices are calculated and measured, and the results show that the calculated values are in good agreement with the measured values. The distributed ventilation and sound insulation shield has a good sound insulation effect at the frequencies above its passing frequency, and the effective noise reduction frequency can be specially designed according to the frequency characteristics of different sound sources. It is suitable for sound insulation of various devices requiring ventilation and heat dissipation.