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噪声衰减量
相关语句
  noise attenuation
     Influence of Land Planting on the Traffic Noise Attenuation Researche
     地表植被对交通噪声衰减量的研究
短句来源
     The Influence of Land Covering on the Traffic Noise Attenuation
     地面覆盖物对交通噪声衰减量的研究
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  noise decrement
     With a project,analyses the causes of over high noise level of cooling towers in central air conditioning systems,provides the noise abatement measures,and calculates the noise decrement for different measures.
     结合工程实例,分析了集中空调系统冷却塔噪声超标的原因,给出降低噪声的措施,计算了各消声措施的噪声衰减量
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  noise reduction shape factors
     Susceptibility Computation of Noise Reduction Shape Factors in the Low-Frequency Range
     低频段噪声衰减量及敏感度计算
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  “噪声衰减量”译为未确定词的双语例句
     The noise reduction in twodifferent reverberant sound fields excited respectively by pure tone and broad band white noise areobtained.
     一个矩形薄铝板和长方体混凝土闭空间构成板/闭空间耦合系统,在混响室中对其在单频和一定带宽的白噪声激励下的声传入噪声衰减量进行了测量。
短句来源

 

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      noise attenuation
    In addition to emphasizing the importance of multi-scattering, this work endeavors to find the appropriate cap angle of the control source to achieve acceptable noise attenuation for different vibrating modes of the primary source (monopole, dipole).
          
    Beamforming with the generalized sidelobe canceller for coherent noise attenuation in 3D seismic data
          
    Data processing involved model-inversion based refraction static correction, surface consistent amplitude compensation, deconvolution, and pre-stack noise attenuation.
          
    This paper introduces an image processing technique into seismic data processing as a noise attenuation technology.
          
    The most homogeneous dip-scanning method using edge-preserving smoothing for seismic noise attenuation
          
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    In this paper the design and performance of expanding silencing exhaust duct for the test bed of automotive engines are discussed. The frequency characteristics of sound attenuation and formula for the calculation of the transmission loss in the multi-stage expansion exhaust duct are given, The test result indicates that the exhaust noise is significantly attenuated and can be effectively controlled by using this Kind of silencing exhaust duct.

    本文论述了车用发动机试验台排气系统中的三节扩张式消声坑的设计和试验结果。文中给出了排气噪声必需的消声量频率特性及消声坑理论消声量实用的传递损失计算公式。试验表明,采用这种消声坑后,排气噪声的衰减量相当明显,使噪声对环境的污染得到了有效控制。

    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。

    The noise reduction through a thin rectangular panel into a rectangular enclosure in a lowfrequency reverberant sound field has been investigated experimentally. The noise reduction in twodifferent reverberant sound fields excited respectively by pure tone and broad band white noise areobtained. They are used to verify, some previous theoretical predictions. There are reasonable agreement between experimental results and theoretical ones.

    前文[3]从理论上计算了低频扩散声场通过一块矩形薄板入射到矩形闭空间的噪声衰减量,本文是实验部分。实验是在混响声场中做的。一个矩形薄铝板和长方体混凝土闭空间构成板/闭空间耦合系统,在混响室中对其在单频和一定带宽的白噪声激励下的声传入噪声衰减量进行了测量。并和前述理论的计算结果进行了比较。理论和实验结果相符合。

     
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