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低频声辐射
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  “低频声辐射”译为未确定词的双语例句
     (2) The increase in the height or the width of the stiffeners causes the contribution of low frequency acoustic radiation from two end plates to increase, and causes high frequency acoustic radiation to increase in the direction opposite to the driving force.
     (2)纵肋的高度、宽度增大都使低频声辐射中两端平底板的贡献量增大,而使研究频域内的高频声辐射在激励力的反方向上增强。
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  相似匹配句对
     Radiometric Calibration of Low Frequency UWBR
     低频UWBR的辐射校准
短句来源
     Radiometric Calibration of Low Frequency SAR
     低频SAR辐射校准
短句来源
     Law of the Gearbox Sound Radiation
     变速箱体辐射规律
短句来源
     Research on Sound Radiation Modes
     对辐射模态的讨论
短句来源
     Study on the Low-frequency Sound Detection
     低频检测研究
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Sound radiation of high-intensity air-modulation loudspeaker is studied. This paper given the sound power of the loudspeaker by different measurement method under some typical condition and is analyzed. The low-frequency sound radiation and the combination by multiple loudspeakers is experienced. The results is used for design of high-intensity acoustical laboratory.

对大功率气流扬声器的声辐射进行了实验研究.给出了研制大功率气流扬声器的在不同典型条件下用不同声功率测量方法所测得的声功率数据并进行了分析比较.还对气流扬声器的低频声辐射和多个气流扬声器的组合进行了实验,给出的有用结果可供高声强实验室设计参考.

A 3-D model of finite element method/ boundary element method for computing the sound field radiated from an axially stiffened cylindrical shell with two end plates in water has been established, and the effects of the height, the width and the number of axial stiffeners on the mean surface velocity, the radiated sound power, the radiation efficiency and pressure directivity of sound field have been investigated. The meshing data and modal data of the model in vacuo obtained from FEM code ANSYS are put into...

A 3-D model of finite element method/ boundary element method for computing the sound field radiated from an axially stiffened cylindrical shell with two end plates in water has been established, and the effects of the height, the width and the number of axial stiffeners on the mean surface velocity, the radiated sound power, the radiation efficiency and pressure directivity of sound field have been investigated. The meshing data and modal data of the model in vacuo obtained from FEM code ANSYS are put into BEM code SYSNOISE and used for computing the parameters of the coupled sound field. The results show that: (1)The increases in the height , the width or the number of stiffeners make the frequency curve peaks of the mean surface velocity, the radiated sound power and the radiation efficiency shift away from that of the cylindrical shell without stiffener, and makes the radiation efficiency increase. However it doesn't change the mean surface velocity and the radiated sound power apparently. (2) The increase in the height or the width of the stiffeners causes the contribution of low frequency acoustic radiation from two end plates to increase, and causes high frequency acoustic radiation to increase in the direction opposite to the driving force. The directivity pattern of the sound field can be changed by adjusting the number of axial stiffeners when the axially driving force is exerted on one of the stiffeners. All above is of significance to the prediction and control of noise radiated from underwater structure.

建立了两端带平底板的加纵肋圆柱壳水中声辐射计算的FEM/BEM三维模型,探究了加肋的高度、宽度、数目对平底圆柱壳表面平均速度、辐射功率、辐射效率、声场指向性的影响规律。计算方法是在有限元软件ANSYS中做加肋平底圆柱壳建模、模态分析基础上,将有关数据(网格、模态)导入边界元软件SYSNOISE中计算流体-结构耦合状态下的辐射声场特性。结果表明:(1)纵肋的高度、宽度以及数目增大都可以引起平底圆柱壳的表面平均速度、辐射功率、辐射效率随频率变化曲线峰的移动,同时使声辐射效率增大,但使表面平均速度、辐射功率变化不明显。(2)纵肋的高度、宽度增大都使低频声辐射中两端平底板的贡献量增大,而使研究频域内的高频声辐射在激励力的反方向上增强。当径向激励力作用在纵肋上时适当调整均布纵肋的数目可以改变平底圆柱壳辐射声场的指向性。这对于水下结构辐射噪声预报以及噪声抑制具有重要意义。

An active acoustic structure,which is an instance of application of intelligent structures to noise control,is a recent and effective approach to the control of structural low-frequency sound radiation.One of the core issues in the study of active acoustic structures is the optimized arrangement of secondary sound sources.Firstly the paper sets up its calculation model,and then arrives at the laws of their optimized arrangement under various conditions through using the sound radiation module and structural...

An active acoustic structure,which is an instance of application of intelligent structures to noise control,is a recent and effective approach to the control of structural low-frequency sound radiation.One of the core issues in the study of active acoustic structures is the optimized arrangement of secondary sound sources.Firstly the paper sets up its calculation model,and then arrives at the laws of their optimized arrangement under various conditions through using the sound radiation module and structural vibration module.Finally a number of computer simulation instances verify the validity of the laws.

有源声学结构是近年来提出的一种控制结构低频声辐射的有效方案,它是智能结构在有源噪声控制领域的具体应用。次级声源的优化布放是有源声学结构研究中的核心问题,本文对此进行了研究。首先建立了有源声学结构的计算模型,然后基于声辐射模态和结构振动模态理论,推导总结出各种情况下次级声源的最优布放规律,最后用一系列的计算机仿真实例对该规律进行了验证。

 
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