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on the sound     
相关语句
  两侧声
     In order to explore the influence of noise from the accelerated trains on the sound environment along the railway the health of residents living along the railway,an investigation was carried out in four operation divisions of the railway based on the national standards for sound source and environmental noise.
     为探讨提速列车噪声对铁路两侧声环境及居民健康影响,依据声源、环境噪声等国家标准,对4个铁路运行区段进行了调查。
短句来源
  对声
     The method for evaluating the effective elasric moduli of void-containing solid is also introduced. The numerical calculation given in this paper shows the influence of the void volume concentration and layer thickness on the sound reflection coefficients and interface wave velocity, providing a theoretical basis for inverse deduction of the mechanical properties of void-containing layer based on ultrasonic measurements.
     本文还介绍了含气泡固体有效弹性模量的估算方法,文中给出的数值计算具体说明了气泡体积浓度和气泡层厚度对声反射系数、声透射系数以及反对称模式界面波传播速度的影响,本文的研究为根据声反射系数和界面波的传播速度的测量反演固体间气泡层的力学性能提供了理论依据。
短句来源
     The sound power of every source can be calculated separately by the system; therefore, the effects of design parameters for engine and aircraft on the sound power can be inspected through change in these parameters.
     各种噪声源的声功率在软件中均可单独计算,因此改变发动机和飞机参数可以考查这些参数对声功率的影响;
短句来源
     The detaited situation of the electromagnetic radiation interference effecting on the sound level meter with RF electromagnetic field is presented in this paper. The research and design of the anti power frequency magnetic field interference effecting on the sound level meter by using power frequency magnetic field test equipment is described also.
     介绍了射频电磁场对声级计进行电磁辐射干扰的详细情况以及利用工频磁场测试装置进行声级计抗工频磁场干扰的研究设计
短句来源
     In the process of studying the acoustic field produced by vibration of the submerged cylindrical shell, the structure dynamic equation, Helmholtz equation in the fluid field and the continuity conditions of the fluid-structure interface compose the coupling vibration equation of the sound-fluid-structure. By use of the solution of the equation, the influence of the low order mode on the sound radiation is discussed.
     利用流场Helmholtz方程及流场与圆柱壳体的耦合条件推导出声—流场—结构的耦合振动方程,然后采用相应的求解方法,对环肋圆柱壳低阶模态声辐射性能进行了分析,讨论了不同的轴向和周向低阶模态对声辐射性能包括辐射声功率级、径向均方速度级的贡献大小.
短句来源
  论《喧哗
     The Symbol Model and Bible Allusion on the Sound and the Fury
     论《喧哗与骚动》的象征模式和圣经隐喻
短句来源
  对声源
     2. We assume that the laser beam radiates evenly the whole surface of the half-infinite liquid. The influences which the optical penetration effect、thermal diffusioneffect and electrostriction effect act on the sound resource are considered. And we buildthe one-dimension model.
     2.假设激光束均匀的入射到半无限液体的整个表面上,考虑光穿透效应、热扩散效应和电致伸缩效应对声源的影响,建立一维模型。
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      on the sound
    The influence of the parameters on the sound velocity is discussed qualitatively for the general case and shown quantitatively by numerical results for an example.
          
    We investigate the frequency and temperature dependence of energy losses and also the dependence of the absorption coefficient on the sound wave vector.
          
    A temperature dependence of the free phonon path is calculated for the examined temperature interval based on the thermal diffusion obtained and the literature data on the sound propagation velocity.
          
    We study the problem of determination of the sound field of a point harmonic source in the coastal zone and the influence of a cylindrical body floating above the source on the sound field formed in the marine medium.
          
    Effect of geometric structure parameters on the sound absorbing properties of a metal fiber material
          
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    The sound velocity in a fibre shows a pronounced anisotropy, that is, the sound velocity along the axis of an oriented fibre is much greater than that perpendicular to it, and therefore it may be used as a measure of the molecular orientation α in the fibre,α= 1 - Cα2/C2where C and Cu are velocities of sound along an oriented fibre and a completely un-oriented fibre respectively.The apparatus used consisted of a pulse generator which sends a pulse of 70 μsec duration with a repetition frequency of 100 times...

    The sound velocity in a fibre shows a pronounced anisotropy, that is, the sound velocity along the axis of an oriented fibre is much greater than that perpendicular to it, and therefore it may be used as a measure of the molecular orientation α in the fibre,α= 1 - Cα2/C2where C and Cu are velocities of sound along an oriented fibre and a completely un-oriented fibre respectively.The apparatus used consisted of a pulse generator which sends a pulse of 70 μsec duration with a repetition frequency of 100 times per second to the moving coil of a loud speaker. The fibre was coupled to the vibrating membrane through a spring clamp. When exited by the pulse, the system underwent damped oscillation with a natural frequency of about 4000 Hz. At the other end of the fibre, about 200 cm from the clamp, a crystal pick-up was located, the output of which was sent to an oscilloscope with the sweep circuit triggered by the pulse voltage. The time of propagation of the longitudinal vibration along the fibre from the clamp to the pick-up was observed from the oscilloscope record, and the sound velocity in the fibre calculated.Since the mechanical properties of fibre depend considerably on the moisture regain and tension, the effect of relative humidity and tension in the fibre on the sound velocity were studied.The best choice of the experimental conditions for the determination of molecular orientation by the sound velocity method appears to be the following: room temperature, 28 - 30℃; relative humidity, 60%; and under a tension somewhat below the critical Young's modulus of the fibre.The sound velocities in the fibres of different draw ratios (r) were determined and extrapolated to r = 1 to give the value for Cu. Experimental results indicate that the degree of molecular orientation of monofils of Nylon 6 increases to approximately 80% after drawing and after-treatment.The degree of orientation for several products of Nylon 6 fibre such as yarns, monofils, and cords was determined. Fibres that possess greater breaking length show higher degree of orientation.

    纤维具有声学的各向异性,声波通过纤维的速度与纤维中高分子链的取向程度有关。测定声波沿纤维轴方向的传播速度可以计算纤维的取向度α: α=1-C~2_u/C~2其中C及C_u分别为声波通过取向及无规取向纤维的速度。 实验仪器采用每秒100次的脉冲电流输至高音喇叭的音圈,纤维通过弹簧夹子与喇叭振膜的中心相耦合。脉冲电流激发喇叭振膜振动系统,使产生逐渐衰减的固有频率振动(约4000赫)。离振源200厘米处的纤维另一端有拾音器,其输出讯号接至由脉冲电压触发扫描的脉冲示波器,从示波器可以观察到从振源到拾音器的距离间声波在纤维中的传播时间,由此计算出声波通过纤维的速度。 纤维的吸湿性与所受张力不同对其力学性貭均有影响,因此研究了相对湿度与张力对纤维中声速的影响,并选择了在室温(约30℃),相对湿度为60%和在小于纤维的临界杨氏模量的作用张力下进行声速法测定纤维的取向度。 研究了不同拉伸程度单纤维样品的声波传播速度,并外推到长度拉伸比为1时作为声波通过无规取向纤维的速度。实验结果表明,尼龙6纤维的取向度经拉伸与后处理逐渐增大至80%左右。 测定了不同品种的尼龙6纤维的取向度,具有较大强度的纤维其取向度较大。

    In this paper, the effect of a random fluctuation surface on the sound field of a harmonic point source in positive sound velocity gradient shallow water is consideved. Approximate expressions for the pole equations and amplitude functions are obtained. It is found that the results of reference [1] are the limiting case of the results of this paper.

    本文考虑了随机起伏表面对正声速梯度浅海中简谐点源的声场的影响,获得了简正波的极点方程和振幅函数的近似表达式。结果指出,文献[1]中的结果为本文的极限结果。

    The field of a harmonic point source in layered media has certain angular distribution. Although by ray theory the angular distribution of sound field can be calculated for given receiving point, but the effect of the frequency on the angular distribution function and the sound field in shadow zone can not be calculated. In this paper, by the normal-mode theory the angular distribution of the sound field in layered media is discussed, the general expression of angular distribution function and attenuation law...

    The field of a harmonic point source in layered media has certain angular distribution. Although by ray theory the angular distribution of sound field can be calculated for given receiving point, but the effect of the frequency on the angular distribution function and the sound field in shadow zone can not be calculated. In this paper, by the normal-mode theory the angular distribution of the sound field in layered media is discussed, the general expression of angular distribution function and attenuation law for directional reception are obtained. The results given above can be used for calculation of the sound field in shadow zone and they represent the influence of the frequency on the sound field. Investigating the channel of the underwater sound and the effect of the signal detection in it, by utilizing the obtained results, the optimum receiving direction can be chosen. For given medium model the numerical calculations are produced, and analysis and discussion are conducted.

    分层介质中简谐点源的声场具有确定的角度分布。应用射线理论虽然也可计算给定接收点声场的角度分布,但是它不能反映重要的信号参数——频率对声场角度分布的影响,此外射线理论还无法计算影区中的声场。本文应用简正波理论讨论分层介质中声场的角度分布,获得了声场角度分布的一般表达式,以及定向接收时的声场衰减规律。所得结果可以应用到射线声学影区,并且反映了声场随频率的变化。当研究水声信道和信号在其中的检测效果时,利用本文的结果可以选择最佳的接收方向。对于选取的介质模型进行了数值计算,分析和讨论了所得结果。

     
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