Aimed at the jet noise which is induced by the expand structure and tail tube in the resistant muffler, a finite element model at low Mach number was developed.
针对抗性消声器中扩张结构和尾管引起的射流噪声问题，建立了低马赫数射流噪声有限元分析模型。
We illustrate the importance of noise reduction of underwater weapon launch tube, and summarize the classification of underwater launch tube and the main sources of launching noise.
阐明了潜用武器发射装置发射噪声控制研究的重要意义，归纳了潜用武器发射装置的分类以及武器发射噪声的主要来源。
It can be effectively separate the noise and vibration as its have some space at the end of the tube, the pipeline is not affected when thermal expansion or contraction.
因管末端有间隙可有效地隔断噪音及振动地传播，热胀冷缩时管路亦不受影响；
Based on the sound absorption mechanism of Helmholtz Resonator, the advantage of soft tube length is fully used in the new structure, and thus the low-frequency noise can be controled easily.
提出了一种新型的宽频带共振吸声结构，该结构基于赫姆霍兹共振吸声机理，并充分利用了软管在长度上的优势，易于实现对低频噪声的控制。
The steel tube collector has effectively lowered steel tube falling height, less collision between steel tubes, no noise and raised steel tube quality.
使用该收集装置能有效降低钢管落差，从而降低钢管间的碰撞，消除噪声，并保护钢管表面质量。
According to the spectral characteristic of the noise source, the tube-type muffler, metal-enclosure muffler, structural-type muffler can be equipped before and after the noise reduction devices.
根据声源的频谱特性在其前后配置合理的管道式消声器、金属外壳式消声器、结构式消声器作为消声降噪的措施。
According to the spectral characteristic of the noise source, the tube-type muffler, metal-enclosure muffler, structural-type muffler can be equipped before and after the noise reduction devices.
根据声源的频谱特性在其前后配置合理的管道式消声器、金属外壳式消声器、结构式消声器作为消声降噪的措施。
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