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声衬
相关语句
  acoustic liner
     The design and experimental investigation of control system for acoustic liner with controllable impedance
     可控声阻抗声衬控制系统设计及实验研究
短句来源
     EXPERIMENTAL INVESTIGATION ON PERFORATED ACOUSTIC LINER IN A SINGLE TRANSONIC AXIAL COMPRESSOR INLET DUCT
     微穿孔消声声衬降噪实验
短句来源
     Design and Adjustment of Flow Duct Facility for Acoustic Liner Measurement
     声衬流动声性能测量的流管实验装置设计及调试
短句来源
  “声衬”译为未确定词的双语例句
     Experimental Study on the Acoustic Property of Bonding Honeycomb Nacell Models in Compressor Inlet
     风扇进气道胶接蜂窝声衬样件声学性能实验研究
短句来源
     A mode-match method was developed for calculating the sound propagation in two-dimensional lined rectangular flow duct with uniform flow,the prediction results agree well with the data from NASA flow duct facility and CAA calculation.
     发展了一种模态匹配方法进行有均匀流条件下敷设声衬的二维矩形流管中声传播的计算,计算结果与NASA流管实验结果和CAA计算结果符合得很好.
短句来源
     The second case considers finite lined duct with flow, no reflection on inlet/outlet, the results agree well with the data from NASA flow duct facility and CAA calculation in references.
     第二个算例为有流动情况下有限长声衬管道不考虑端口反射的声场计算,它与文献中NASA流管实验结果和CAA计算结果符合得很好。
短句来源
     Numerical simulation of propagation of rotor / stator interaction noise in turbofan exhaust duct which is assumed to be made up of annular ducts with axially segmented treatments is developed by the mode analysis method.
     应用模态分析方法对转/静干涉噪声在敷设声衬的风扇静子后排气管道中的声传播,声衰减进行了数值模拟。
短句来源
     The algorithm of the reactance is modified for the liner with thick perforated plate,based on the analysis of experimental results.
     对实验的结果进行了一些分析,给出了厚板通气声衬声抗的一种算法。
短句来源
更多       
  相似匹配句对
     EXPERIMENTAL INVESTIGATION ON PERFORATED ACOUSTIC LINER IN A SINGLE TRANSONIC AXIAL COMPRESSOR INLET DUCT
     微穿孔消降噪实验
短句来源
     In Situ Bimicrophone Method for Acoustic Impedance Measurement
     在线测量阻抗的双传器法
短句来源
     Sound environmental mode;
     环境模式;
短句来源
     Acoustic suspension phenomenon
     悬浮现象的研究
短句来源
     Development of Resilience Interlinings for Western-Style Clothes
     弹力西服的研制
短句来源
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  acoustic liner
These measurement results show: (1) that noise levels can be significantly reduced through the use of an appropriately designed passive acoustic liner; and (2) the true noise levels that are experienced by patients during echo planar imaging.
      
One of the needs of the NASA Langley program was the capability to accurately and efficiently predict the behavior of the acoustic liner.
      


Numerical simulation of propagation of rotor / stator interaction noise in turbofan exhaust duct which is assumed to be made up of annular ducts with axially segmented treatments is developed by the mode analysis method. By quantitatively predicting the change of the mode coefficient distribution of forward and backward propagating acoustic energy at the segment interfaces, the attenuation of interaction noise is also investigated. The results manifest that when the forward travelling sound waves pass through...

Numerical simulation of propagation of rotor / stator interaction noise in turbofan exhaust duct which is assumed to be made up of annular ducts with axially segmented treatments is developed by the mode analysis method. By quantitatively predicting the change of the mode coefficient distribution of forward and backward propagating acoustic energy at the segment interfaces, the attenuation of interaction noise is also investigated. The results manifest that when the forward travelling sound waves pass through the admittance discontinuity planes, the modal reflection will increase and the forward modes of waves will decrease. So the modal reflection at the interfaces can be utilized to suppress propagation of the in-duct noise. In addition, the effects of the change of resistance and reactance of liners on the suppression are theoretically calculated. It can be concluded that in the presence of high frequency source and high Mach number flow, whether for the change of resistance or for the change of reactance, there exist local peak values and fluctuation of the in-duct suppression, and at this moment, the monotonicity of suppression with the change of resistance and of reactance will no longer come into existence. Therefore, it is necessary for the engine noise reduction to choose adequate impedance of liners.

应用模态分析方法对转/静干涉噪声在敷设声衬的风扇静子后排气管道中的声传播,声衰减进行了数值模拟。前传声波在遇到声导纳间断面时,声波反射模态增加,前传模态相应减少,因此可利用多段声衬声导纳间断面上的模态反射来抑制管内噪声的传播。计算并分析了均匀流情况下声衬声阻和声抗对管内消声量的影响。在高频声源和大Mach数气流情况下,随声阻或声抗变化,噪声衰减量都存在局部峰值和波动,此时不再呈现低频情况下的单调特征。因此,选择适当的声衬阻抗可有效地抑制发动机噪声传播。

Some experimental results and analyses from the measurements of the sound field in a single transonic axial compressorr inlet duct with single plastic glass lining are presented.The plastic glass linings are designed and made by ourselves (two kinds of perforate rating,σ 1=2 85% and σ 2=5 85%).The experimental results are firstly obtained in China from the real sonic fields in a single transonic axial compressor at high sound pressure conditions...

Some experimental results and analyses from the measurements of the sound field in a single transonic axial compressorr inlet duct with single plastic glass lining are presented.The plastic glass linings are designed and made by ourselves (two kinds of perforate rating,σ 1=2 85% and σ 2=5 85%).The experimental results are firstly obtained in China from the real sonic fields in a single transonic axial compressor at high sound pressure conditions (>150dB).The experimental results and conclusions provide some reference for the further investigation on design of the acoustic treatment assemblies in aeroengine nacells and turbomachinery duct.

介绍用有机玻璃制作的两套结构尺寸不同的微穿孔消声声衬试件,在单级跨音压气机台上进行的3次降噪实验。目前国内尚无人获得微穿孔消声声衬在跨音、大流量、高声压级模拟声源环境条件下的噪声测试数据。通过实验,为进一步合理地设计声衬提供了参考数据,并看到了这种降噪方法在流体机械管道消声方面的应用前景。

A counter rotating ventilator with high efficiency has been made,but its noise level is too high.This paper analyzes the noise generation and noise frequency characteristics.A lot of noise experimental researches on noise suppression have been carried out successfully by the aid of acoustic liner or appropriate increase of the duct length.As a result,overall sound pressure level is reduced from 101dB(A) to 88dB(A).

针对一台自行设计的高效对旋轴流风机噪声高的缺点,分析了主要噪声源及噪声的频率特征;并用消声声衬及适当增加管道长度的方法进行了大量的实验研究,取得了良好的效果。总声压级由101dB(A)降至88dB(A)。

 
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