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气动技术的发展大大推动了工业自动化和生产现代化的进程，但气动回路系统的气流噪声是气动技术的主要缺点，气动降噪引起了工业应用部门和学术界的广泛关注。木文以消声器测量回路系统为例，对回路系统的噪声源进行了分析。首先用三维ＬＤＶ系统对系统中用于电磁阀等排气噪声的声源的孔板的流场进行了测量，较为翔实的得到了平均速度及湍流强度和雷诺应力等湍流量，分析了其同一般的收缩喷嘴射流的异同关系。同时测定其声场，分析其噪声方向特性，找出了声场和流场的一些内在关系，揭示了孔板的噪声产生机理。并对孔板这一声源进行了分析，提出了精确的孔板噪声预测公式。最后对回路系统的其他部分的噪声进行了预测，综合预测结果同实验吻合较好，为气动系统的降噪提供了理论指导。
The development of pneumatic technology has greatly promoted the process of industrial automation and production modernization. However, the airflow noise of pneumatic circuit system is the main disadvantage of pneumatic technology. Pneumatic noise reduction has aroused widespread concern in industrial applications and academia. Muwen takes the muffler measuring loop system as an example to analyze the noise source of the loop system. The three-dimensional LDV system was used to measure the flow field in the orifice plate of the sound source used for the exhaust noise such as the electromagnetic valve in the system. The turbulence quantities such as average velocity, turbulence intensity and Reynolds stress were obtained in detail. Similar shrinkage nozzle jet similarities and differences. At the same time, the sound field was measured, the noise direction characteristic was analyzed, some internal relations between sound field and flow field were found out, and the noise generation mechanism of orifice plate was revealed. The sound source of the orifice plate is analyzed, and the accurate prediction formula of orifice noise is put forward. Finally, the noise of the other part of the loop system is predicted. The result of the comprehensive prediction is in good agreement with the experiment, which provides theoretical guidance for the noise reduction of pneumatic system.