空气动力性噪声

锯齿前角对空气动力性噪声的影响是，随着前角的减小，噪声随之增大，但这种趋势并不十分明显；

The effect of tooth pitch on aerodynamic noise is that the noise usually increases with tooth pitch increasing , but the trend is getting weak with increase of tooth pitch .

对VW0.22/7B型空压机的噪声源测试分析，确定其空气动力性噪声最强。

An aerodynamic noise is confirmed to be the strongest one according to the test and analysis of the frequency spectrum of the noise from VW-0.22/7-B Air Compressor from the consideration to the machine itself structure and characteristic .

高速铁道车辆（时速≥200km／h）的噪声源主要是：轮轨噪声、构造物噪声、集电系噪声和空气动力性噪声。

The major noise resources of high-speed railway vehicles ( v 200km / h ) are wheel-rail rolling noise , structure noise , aerodynamic noise and collector system noise .

真空伏辊空气动力性噪声实验研究

The experimental research on aerodynamical noise of vacuum couch roll

还测量了排烟换热器排气的空气动力性噪声，确定了消声频率；

Meanwhile , the noise of exhaust is measured to acquire the noise elimination frequency .

人造板机械的噪声主要有机械噪声和空气动力性噪声。

The noise of wood-based panel machinery mainly includes mechanical noise , air dynamic noise , etc.

通过分析风机叶片噪声的类型，研究风机叶片产生空气动力性噪声的机理。

The fan blades noise types are analyzed . It studies fan blades airflow dynamic noise principle .

在利用容器消除其它机械的空气动力性噪声方面也存在同样的问题。

The same problem should be noticed in utilizing containers to eliminate aeromechanic noises of other machines .

降低真空伏辊空气动力性噪声是降低抄纸机噪声的关键。

The key point of reducing noise of paper machine is to reduce aerodynamic noise of vacuum couch .

VW-0227-B型空压机的噪声源，其空气动力性噪声最强。

An aerodynamic noise is confirmed to be the strongest of the noise from VW 0.22/7 B air compressor .

由实验看出，采取适当的方法，可使离心风机的空气动力性噪声有一定的降低。

Thus to take suitable way can reduce air dynamic noise of the centrifugal fan 3 ~ 7 dB ( A ) .

通过对空压机噪声源的分析，确认空压机噪声源中的空气动力性噪声为最强；

On the basis of the analysis about noise sources of the air compressor , it shows that air dynamic noise is primary one .

本文通过旋叶式压缩机振动噪声理论分析和声源识别实验分析，确认旋叶式压缩机的主要噪声源是空气动力性噪声和机械噪声。

With the experiment of noise source identification , exhaust hole is the main source of compressor , and the noise is the main aerodynamic noise .

为了减少精密裁板锯的噪声，第一种重要方法就是减少主锯片高速旋转所产生的空气动力性噪声。

For reducing noise of precision panel saw , the first important way is to reduce the aeromechanic noise produced by main saw blade rotating at high speed ;

测试结果表明精密裁板锯空载噪声源主要来源于主锯片，它的空气动力性噪声是最大的。

The testing results showed that the unloaded running noise source of precision panel saw was mainly from main saw blade and its aeromechanic noise was the largest .

为控制空气动力性噪声，分别对径向叶片缩减、叶片的前弯与后弯、倾斜叶片、倾斜蜗舌等不同情况下进行实验。

It is carried out a test of radial vane reduce , forward bend vane , toward the back bend vane , incline worm tongue in different condition .

声屏障用于降低以空气动力性噪声为主的水泵、风机、冷却塔等噪声源，结合室内吸声处理能收到明显的效果。

The barriers , which can reduce the noise sources of a pump , a fan and a coolling tower , have an evident effect with the indoor absorbing treatment .

本文设计了真空伏辊实验模拟装置，并在其基础上通过实验研究，提出降低真空伏辊空气动力性噪声的方法。

We design the laboratorial device of vacuum couch roll and base on the experimental research , we put forward some solution to reduce aerodynamical noise of vacuum couch roll .

防爆抽出式风机的噪声是空气动力性噪声、电动机噪声、风机机械性噪声、扩散器出口噪声等相互叠加的结果。

Noises from anti-explosion extraction fans in a combination of the air dynamic noises , the motor noises , the mechanical noises from fan and the noises from the diffuser exits .

主要噪声来源为空气动力性噪声.它可分为3个部分：绕流声、附面层噪声与尾流噪声。

The main source of noise is aerodynamic noise which may be divided into three major parts : noise from vortex flow around the train , noise from boundary layer and noise from wake .

负载噪声主要是由圆锯片击打工件，圆锯片与工件相互作用产生的稳态脉冲激励噪声、振动噪声、摩擦噪声和空气动力性噪声组成。

The main noise source in cutting is the noise from the work piece hit by the teeth of the saw , which concludes stable state pulsed excitation noise , vibration noise , frictional noise and aerodynamic noise .

轴流式风机的噪声是空气动力性噪声，电动机噪声，风机机械性噪声，扩散器出口噪声，检查门及风井漏气噪声等相互叠加的结果。

The noise from axial fans is a combination of the air dynamic noise , the motor noise , the mechanical noise from fan , the noise from the diffuser exits and that caused by the leaking of gas in the inspection doors and the axial shafts .