Firstly, the vortex noise can be reduced mainly through the optimization of the geometric parameters of the impeller and volute and installing a rotation diffuser in the outlet of the impeller.
首先，对于多翼离心风机涡流噪声的降噪，主要通过优化叶轮、蜗壳的结构几何参数和在叶轮出口加装旋转扩压器等方式进行。
Taking the noise elimination of the outlet temperature signal of hydrocracking reactor as an example, the effect of the model parameters of the wave filter for noise elimination was compared.
在分析线性滤波器原理的基础上，建立了化工系统动态信号的最优线性滤波器的数学模型，并以加氢裂化反应器出口温度信号的除噪为例比较了滤波器模型参数对去噪效果的影响。
New underwater exhaust outlet reduced noise levels while allowing peak performance.
新的水下排气口降低噪音水平，同时允许的峰值性能。
The noise of fan outlet is a chief noise source in the coal mine.
对于煤矿噪声分析，主要噪声源是风机出口噪声。
In addition a reversed flow was formed in the outlet, which could cause a block and produce noise.
另外，在出料直管内形成一个回流区，易造成出料口堵塞，也会产生噪声。
Air vents at the general noise, and hot air, the choice of air outlet location shall not affect the normal life of the residents.
排风口处一般有噪音，和热风，选择排风口位置时不得影响到居民的正常生活。
Three types of mufflers for fluid-filled pipes are designed to minimize noise radiation from the pipe outlet. An experimental pipe system is built and the performances of the mufflers are tested.
设计了三种水管路消声器，建立了一套水管路模拟实验系统，对所设计的消声器消减管口辐射躁声的性能进行了实验测试。
Good adaptability, flexible inlet and outlet arrangement, low noise, convenient manipulation and maintenance;
适应性强，进出口位置布置灵活、整机噪音低、操作维修方便；
The present invention has no air inlet and outlet valves, and no balancing blocks, and the vibration noise is small.
本发明没有进排气阀，没有平衡块，震动噪音小。
The present invention has no air inlet and outlet valves, and no balancing blocks, and the vibration noise is small.
本发明没有进排气阀，没有平衡块，震动噪音小。
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