噪声控制

Numerical simulation of structural acoustics is an important aspect of noise and vibration control domains.

结构噪声数值模拟是振动与噪声控制领域的一个重要研究方向。

The structures of cylindrical shell and spherical shell are basic components and widely used in industrial fields.

圆柱壳、球壳结构是工程领域中普遍应用的基本构件，研究该类壳体结构流固耦合辐射声场，对国防武器装备隐身技术的进步、工程结构的噪声控制及现代机电产品的低噪声优化设计等都具有重要的理论价值和现实意义。

The noise of Gold(750kW) wind power generator set can meet the requirement of the criterion of industry corporation noise control and the criterion of noise in city area , by the noise reduction measure thereinafter.

通过以上的降噪措施，金风750kW风力发电机组的噪音水平满足《工业企业噪声控制设计规范》和《城市区域环境噪声标准》的标准要求。

This method can make sure the structure radiant sound status in total noise and the detail phonate part quickly and correctly.(3) Study on the control mechanism of structure noise radiated from rotary machines, we build a common model of rotary machine structure noise analysis relied on the general characters of rotary machines. Based on this model, we analyzed various influence factors to structure radiant noise using the union of revolution and numerical calculation method. We found that the joint stiffness between the rotor and the frame is the most sensitive parameter of structure radiant noise by calculating and analyzing.

根据本文对于旋转机械结构噪声控制技术的研究结果和惯性振动筛工作的特殊要求，对有关参数的选择进行了讨论，并通过试验为降低惯性振动筛噪声找到了两个新的方法：即，在轴间相对运动要求不高的情况下，可以在激振器与筛体之间安装一组减振器，通过适当选取减振器参数，既可以使机体在工作频率附近获得稳定振幅，保证振动筛正常工作，又可以使机体的高频响应减小，降噪效果显著；反之，如果轴间相对运动精度要求(来源：1aABC论文网www.abclunwen.com)较高，可以采用空心滚动体轴承，在保证滚动体强度的条件下也可以获得较好的降噪效果。

There were only few cases with CBA for noise abatements in China,but the authors believe it may grow up and become an important method for environmental noise management and project development.

介绍了成本效益分析在噪声控制工程领域应用的最新国际动态，并例举了有关交通噪声的重要案例。

Aiming at the problem of heavy duty vehicle engine vibration and noise, this thesis develops theoretical and application research on the vibration and noise control for a 6-cylinder, in-line, four-stroke diesel engine based on modern design theory and technique.

本文以重型车用发动机的振动和噪声问题为出发点，应用现代设计理论与方法对某直列四冲程六缸柴油机开展振动与噪声控制问题的理论和应用研究工作。

This article has introduced noise reduction principles and methods, formation mechanism of vehicle exhaust noise, sorts of vehicle exhaust mufflers.

本文系统介绍了噪声控制的方法，汽车排气噪声的产生机理以及车用排气消声器的种类。

Effect of reinforced stringers and rings wave propagation of the shell was analyzed and mechanism of vibration depression was discussed by wave propagation theory.

结果表明，采用当前的加筋方案对壳体结构的振动噪声控制、固体传声控制和动强度控制具有良好的效果。

Apply basic principle of control mechanical noise to measures had been put forward to reduce vibration and noise, and idle of the wood surface planer was remarkable reduced after the measures of reducible vibration and noise were used.

运用机械噪声控制的基本原理提出了减振降噪措施，试验证明，采用这些减振降噪措施后，木工平刨床的空转噪声有了显著下降。

If we assume that we can tolerate errors of no more than 0.5 LSB, this calculation tells us that in a 16-bit SYSTEM with 10 V FS we must KEEP the total error to less than 76 pV, which is approximately equal to the thermo- ELECTRIC voltage in a nichrome wirewound RESISTOR with copper/nickel leads having about 2℃ temperature difference between its ends.

假设电路的噪声必须小于0.5LSB，按照前面的计算，这意味着在10V量程的电路中必须将噪声控制在76uV以下，而这个电压大致与线绕电阻的两个引脚间温差2C时的热噪声相当。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。