消声

Acoustic reflection measurements of steel spheres between 2 and 5 centimeter in diameter have been made in an anechoic tank .

在消声水池中对直径范围为2cm～5cm的钢球进行了回声测量。

The test piece is connected to the acoustic driver and an anechoic termination through two straight pipes.

待测试的声学元件通过两端很短的直管连上白噪声发生器和消声末端。

Our products mainly include the punching- sealing parts of the bodywork, batholiths and mufflers.

产品以汽车车身、底盘、消声净化器的冲压焊接零部件为主，同时也生产汽车部分总装零件。

The optimum design of the controller of compound active noise cancellation earmuff is discussed.

探讨了复合式有源消声耳罩的控制器的优化设计方法。

The experiment shows that the catalyst portion has very obvious effect on the exhaust purity box ,purity ratio and oil consumption ; In the course of the opening ratio has an less obvious impact on experiment ,the three items ;the least impact on the three items is the carrers diameter.

试验结果表明，催化剂用量对净化消声器的消声量、净化率及油耗三项指标均有显著的影响；穿孔板的穿孔率在试验范围内，对净化消声器的三项指标影响较为显著；载体直径对净化消声器的三项指标的影响次之。

Catalyst dosage ,the particle diameter of catalyst and the opening ratio of the opening piece are to be experimented and analyzed according to the three items of purity of exhaust purifying box .Exhaust muffler and oil consumption .The relationship between the paramefers and exhaust parity exhaust noise and the oil consmption ratio is analyzed the effecting degrie.

针对尾气净化消声器的净化、消声及油耗三项指标，选取了催化剂用量、催化剂的颗粒直径、开孔板的开孔率三个主要影响因素进行了正交试验和分析，探讨了这些参数和尾气净化、排气噪声、油耗率之间的关系及其影响程度。

Some theoretic models and assessment indexes of exhaust silencer are analysed and discussed in this paper,and indicates that the establishment of theoretic model must be coherent with the function assessment index.

对排气消声器的几种消声理论模型和性能评价指标进行了分析和讨论，指出了理论模型的建立应与性能评价指标协调一致。

After all, an OAA style experimental set-up in a single expansion chamber silencer for engine exhaust noise control was developed. Three kinds of software for the AANC system, the AANC system combined with the ALE, and the AANC system combined with the proportional tuned PDC were programmed.

结果表明：该系统在部分消除了影响次级通道建模精度的宽带干扰噪声的同时，充分发挥了前向窄带控制系统的作用，提高了次级通道建模精度，系统稳定性及消声性能得到提高。

High-temperature exhaust muffler as well as the roof fan series muffler, regulating valve, butterfly valve, exhaust valve, positive pressure to send air, fire dampers, smoke mouth plate, fire protection, thermal insulation hose.

消声高温排烟以及屋顶风机系列消声器、调节阀、蝶阀、排烟阀、正压送风口、防火阀、板式排烟口、防火、保温软管。

It is an important topic to design exhaust mufflers that have good attenuation performance and low pressure loss in the field of automobile's noise control.

设计高消声性能、低压力损失的排气系统是目前汽车噪声控制中的重要课题。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。