1·The existence of higher order mode waves in expansion mufflers is proved theoretically.
从理论上推导了扩张室消声器内可能存在的高次波。
2·The research shows that the three-dimensional acoustic boundary clement model is an efficient and highly accurate method of sound field analysis of reactive mufflers.
研究结果表明，三维声学边界元模型是抗性结构消声器声场分析的有效方法并具有较高精度。
3·Counter workers may also be employed in specialty firms that supply only certain types of parts, such as electrical and carburetor systems, mufflers, brake parts or similar equipment.
柜台工作人员也可受聘于专业公司，供应只某些类型的零件，如电气和化油器系统，消声器，制动器部件或类似的设备。
4·Intubation structure can improve the acoustic performance of mufflers and widen the frequency range of mufflers, but its length must be designed according to the exhaust spectrum.
内插管结构能改善消声器的声学性能，拓宽消声频率范围，但设计它的具体长度需要根据排气频谱来选择。
5·Fluid pressure pulse is one of the main noise source in water piping system, mufflers are widely used to restrain pressure pulse.
在海水管道系统中，由泵、阀门、弯头等元件引起的压力脉动(即流噪声)是主要的噪声源，消声器被广泛应用于抑制流体压力脉动。