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the sound pressure
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  声压
     The sound pressure of probe 1.25 MHz and 2.5MHz are P_=0.158MPa, P_=0.117MPa and P_+=0.055MPa P_=0.05955MPa, respectively.
     1.25MHz探头在轴向距离13cm处声压P_+=0.15789MPa,P_-=0.11658MPa,I_(SPTP)=1.66W/cm~2;
短句来源
     When L p1 < 153 dB, the relation between the sound pressure amplitude of m-th harmonic pm and that of fundamental P1 is about pm ̄ p.
     在Lp1<153dB时,m次谐波声压振幅pm与基波声压幅值p1;
短句来源
     The theoretical research showed that on the condition |r_p|=0.3,the value of the sound pressure at was bigger than it used to be at.When σ_π=0.5π,the acoustic field′s value grew with the increase of |r_p|.
     理论研究表明,在|rp|=0.3,相位差为σπ=0.5π时的声压幅值大于σπ=π的声压幅值;
短句来源
     The results showed that the depth and width of the groove with a certain angle to the central line of tread had little effect on the tire noise,but the angle of groove had great effect on the tire noise,and the sound pressure of tire noise would increase by 110%~130% with every 15° increase of angle of groove.
     研究结果表明,对于与轮胎中心线成一定角度的花纹沟,其深度和宽度对轮胎噪声的影响不大,而花纹沟角度的影响很大,其每增大15°,轮胎的噪声声压将提高110%~130%。
短句来源
     The solution gives explanation to the relationship between nonlinear parameter C/A and the sound pressure of third-order harmonics, thus providing a theoretical foundation for the measurement and study of the nonlinear parameter C/A of fluids by the finite amplitude method.
     在此基础上进而求得三阶非线性声参量C/A与三次谐波声压之间的关系,这为下一步用有限振幅法测量和研究流体媒质的三阶非线性声参量C/A提供了理论基础.
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  声压级
     The results showed that the main frequencies were at about 6~100Hz and the sound pressure levels were about 80 dB(A).
     结果显示声音的主频在 6~ 1 0 0Hz左右 ,为次声和低频噪声共存 ,工作场所声压级在 80dB (A)左右。
短句来源
     By means of orthogonal planning and digital signal processing, the learningsamples of artificial neural networks were obtained, which regarded the sound pressure level of 1/3 octavebands and the specific fuel consumption of diesel engine as inputs, the structural parameters of muffler as outputs.
     利用正交试验和排气噪声数字信号处理获得了1/3倍频程声压级和柴油机燃油消耗率作为输入、结构参数作为输出的人工神经网络的学习样本;
短句来源
     Based on harmonic and noise experiments the surface harmonic distribution models of rolling bearings are established, the influence of some harmonic distribution parameters on the sound pressure level of the rolling bearing noise is investigated, and the optimum harmonic-control-line equations of controlling the noise are drawn.
     以谐波和噪声实验为基础 ,建立滚动轴承表面谐波分布模型 ,研究谐波分布参数对轴承噪声声压级的影响规律 ,得出控制噪声的最优谐波控制线方程。
短句来源
     The sound pressure level of noise is signicantly increased above 16,000 rpm.
     噪声的声压级在16,000转/分以上时有明显的增加。
短句来源
     Based on the harmonic and noise experiment, the model of the rolling bearing surface harmonic distribution is established, the harmonic distribution parameters of affecting the sound pressure level of the rolling bearing noise are investigated, and the harmonic control line equations of controlling noise are presented.
     以谐波和噪声实验为基础,经过数理统计分析,建立轴承滚动表面谐波分布模型,研究谐波分布参数对轴承噪声声压级的影响规律,得出控制噪声的最优谐波控制线方程。
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  “the sound pressure”译为未确定词的双语例句
     As the sound pressure level increased,more obvious changes in lung were found. After 8 Hz,120,130 dB and 16 Hz,90,130 dB exposure for many times,PaO 2 and SaO 2 dropped rapidly( P <0.01).
     8Hz,12 0、130dB和 16Hz ,90、130dB的次声多次作用后 ,PaO2 和SaO2 明显下降 ,与正常对照组相比 ,差异有显著性 (P <0 .0 1)。
短句来源
     Nine lists of the Mandarin disyllabic materials with equal difficulty were utilized. Result:P-I function was y=-200.9+13.4x-0.14x~2. The sound pressure level of speech corresponding to a 50% recognition score was 26.4 dB SPL, or 6.4 dB HL .
     结果:双音节MSTM的言语识别率与给声强度间的函数关系为y=-200.9+13.4x-0.14x2,在26.4dBSPL给声强度处可获得50%的正确率。
短句来源
     The sound pressure level of main frequency was decreased above 40dB, which is demonstrated by the experimental results.
     在消声实验台的自适应控制结果表明 ,在主频上取得了降噪 40dB以上的效果。
短句来源
     The causes for the muffler attenuation trough was analyzed by the sound modal analysis and the sound pressure map analysis, and the improvement was put forward with the control measure of the long duct standing wave.
     用声模态分析和声压分布图分析的综合方法分析了消声器产生消声低谷的原因,并利用长管道驻波的控制方法加以控制。
短句来源
     In this paper,the application of boundary element method in environmental acoustics is reviewed,for example,how the sound pressure levels distribute around the barriers and the roads,and how the meteorological conditions influence the outdoor sound propagation.
     本文介绍了边界元法在环境声学中的应用 ,如声屏障和不同情况下道路周围的声场分布、复杂气象条件对声传播的影响的问题等。
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  the sound pressure
First, using tonal inputs, the regions of snap-through are mapped in the sound pressure level-input frequency domain ((SPL, ω) plane).
      
The relation between the sound pressure level (SPL) and surface roughness under various contact loads was established.
      
It is found that collision of two solitons gives rise to very enhanced interference of the sound pressure.
      
The amplitude of P1N2 in relation to that of wave IV of the summated potentials recording monaural stimulation of the right and left ear remains constant with an increase in the sound pressure level from 47 to 107 dB.
      
The onset of acoustic cavitation is statistical in nature with increasing event rates as the sound pressure amplitude is increased and whose threshold depends on the waiting time at that particular amplitude.
      
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This paper describes the design of a frequency shifter to suppress acoustic feedback, to be studied by the experimental method. When the frequency shifter is inserted between the microphone and loudspeaker in the public address system, it shifts all frequency components of the microphone signal by a constant amount. By this method two types of distortions due to acoustic feedback in the public address system can be reduced. The sound pressure level in a room can be increased by about 5-8 db on a number...

This paper describes the design of a frequency shifter to suppress acoustic feedback, to be studied by the experimental method. When the frequency shifter is inserted between the microphone and loudspeaker in the public address system, it shifts all frequency components of the microphone signal by a constant amount. By this method two types of distortions due to acoustic feedback in the public address system can be reduced. The sound pressure level in a room can be increased by about 5-8 db on a number of auditoriums. For the public address system in free field, which has multiple loudspeakers, it also has the same effect. If the public address system is operated below but too close to the instability condition the frequency shifter can reduce effectively the interference of the regenerative reverberation.

本文叙述抑制声反馈的频移器的设计,并进行了实验研究.当语言扩声系统的传声器和扬声器之间插入频移器时,传声器信号的所有频率分量都偏移一个常量,这种方法可以减少语言扩声系统在有声反馈时产生的两类畸变.对于一般厅堂,扩声声级大约可提高5—8分贝.对于具有分布式扬声器的窒外扩声系统,也有类似的效应.若语言扩声系统临近不稳定状态工作,频移器可以有效地减少再生混响干扰.

This article is presented out of to the necessity of the acoustic logging of petroleum wells.The system is assumed to be a fluid cylinder surrounded by a uniform quasi elastic solid medium and the acoustic logging tool is simulated by a central rod with local vibrating surface.The two dimension fast Fourier Transform(FFT)algorithm is adopted.Sound fields in rocks of different properties using different source frequencies are calculated and the sound pressure waveform curves on a series of recording points...

This article is presented out of to the necessity of the acoustic logging of petroleum wells.The system is assumed to be a fluid cylinder surrounded by a uniform quasi elastic solid medium and the acoustic logging tool is simulated by a central rod with local vibrating surface.The two dimension fast Fourier Transform(FFT)algorithm is adopted.Sound fields in rocks of different properties using different source frequencies are calculated and the sound pressure waveform curves on a series of recording points are obtained.These curves clearly indicate the existence of four kinds of wave groups.The error of their calculated velocities is less than 4%.The characterestic attenuation curve is also given.The results of calculation show that the physical model is acceptable and the method of calculation and the computing program are reliable and thus provide a theoretical basis and an elegant method for holographic study of oil well logging.

本文是直接针对声法石油测井的需要提出的,假定体系为准弹性均质固体中的流体柱,测井声系用局部表面振动的中心圆柱模拟。采用二维快速Fourier变换(FFT)算法,对不同频率的声源在各种岩性下的声场进行了计算,得到了一系列记录点的声压波形曲线。这些曲线清楚地表明有四种波群存在,计算了它们的速度,误差低于4%;同时也给出了衰减特性曲线。 计算结果表明,物理模型是可取的,计算方法与程序可靠,为开展全信息测井研究提供了理论依据和有效手段。

This paper describes the design of underwater sound projector using thinwalled piezoelectric ceramic ring. The circumferential-direction vibration mode and axial vibration mode of the ceramic ring are discussed. The sound pressure projected by the ring at any frequency is the superposition of the above two vibration modes. The equivalent circuit parameters of the axial vibration mode transformed into the radial vibration mode of the ring are discussed. On this basis, the normalized pressure-frequency...

This paper describes the design of underwater sound projector using thinwalled piezoelectric ceramic ring. The circumferential-direction vibration mode and axial vibration mode of the ceramic ring are discussed. The sound pressure projected by the ring at any frequency is the superposition of the above two vibration modes. The equivalent circuit parameters of the axial vibration mode transformed into the radial vibration mode of the ring are discussed. On this basis, the normalized pressure-frequency response of the above two vibration modes is calculated. The tabulated values can be used for reference in designing the cylindrical underwater sound projectors.

本文叙述薄壁压电陶瓷圆管水声发射换能器的设计。对圆管周向和轴向振动两种振动模式进行了讨论。任意频率上发射的声压为两种振动的迭加。探讨了轴向振动转换为径向振动的等效电路参数。在此基础上计算出两种模式的相对声压频率特性,列出了附表,可以作为设计圆管形发射换能器的参考。并介绍了实例。

 
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