消声的

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

探讨了复合式有源耳罩的控制的优化设计方法。

The driver deadened the noise of the car with a new muffler.

司机安装了新的减少汽车嗓音。

The new muffler device has simple structure,it has lesser effect on the resistance loss of chief ventil...

该装置结构简单,对主要通风机的阻力损失影响小,防尘、防潮及降噪效果明显,可广泛的应于煤矿主要通风机的降噪。

The sound tranfer loss of 2 kind of muffler structures are calculated, then tested and verified on the double sound transferrer random exciting exhaust muffler testing rig.

利此种矩阵,计算了两种结构的的传递损失,并在双传随机激励试验台上进行了试验验证。

JCQ depurant-muffler is adopted on 49ZQ engine using small rare-earth element balls as catalyst and took the method of quadrature frequency band optimization to opetmize the configuration parameters.

于492Q发动机的JCQ净化采稀土小球为催化剂，正交频带加权优化法优选结构参数，取得良好的、净化性能。

By using this method, the effects of various parameters on the performance of the exhaust muffler and a variation law are clear and all the indexes of the new muffer are improved.

通过正交设计,使新的各项指标得到提高。