查询词典 acoustic velocity

The amplitude of the surface velocity of the panel and the acoustic pressure on the porous surface are reduced largely in the vicinity of structural resonances due to the additional radiation damping and visco-thermal absorption phenomenon in the porous layer.

请注意振膜表面速度分布的两种极端情况。一种极端情况产生在作活塞运动的刚性表面中，此时整个表面的振幅和相位是处处相等的。

Combined sensor can pick up the information of both acoustic pressure and particle velocity .

组合传感器联合拾取声场中的声压和振速信息。

No doubt, the more the information, the better the processing effect will be. The technology of acoustic pressure and particle velocity combined processing is expected to bring new life to the developments of signal processing of underwater acoustics and sonar technology, which is the main content of this thesis.

更多的信息量必然带来更好的处理效果，基于组合传感器的声压、振速联合处理技术有望给水声信号处理和声呐技术的发展带来新的活力，这正是本论文的主要研究内容。

Acoustic correlation velocity measurement technology is used to make measurements of velocity relative to the seabed.

声相关测速技术可以测得舰船相对于海底的绝对速度。

A three-dimensional-acoustic Doppler velocimeter is used to measure the velocity near the wall. Measurement of velocity in indirect method is used to determine the tangential stress on the wall. The hair of palm is used to imitate the vegetation.

采用多普勒流速仪测量边壁附近的流速，用间接法中的流速测量法测量边界上的切应力，用棕榈毛作为植物的模拟材料。

In this paper, one example from Zhongyuan Oilfield, Wen-33-26 well with long spacing acoustic wave train log is given. The measured ''shear wave velocity was treated as Rayleigh wave velocity. The poisson ratio and Young...

本文以中原油田Wen-33-26井的长源距声波全波列资料为例，将所测得的井下"横波"速度当作瑞利波速度处理，求得的泊松比和杨氏弹性模量值更为合理。

An increase in the blood flow velocity of internal jugular vein,the abnormal acoustic frequency and its spectrum of TCD were signs indicated that the blood stream of CCF were drained by the superior and/or inferior petrous sinuses.TCD could detect the superficial sylvian vein where the blood flow velocity increased when the cortical veins were the main veins draining CCFs.

异常眼静脉搏动征，血流反向是诊断CCF眼上静脉引流的可靠指标；颈内静脉流速增高，声频及频谱异常是CCF血流经岩上窦、岩下窦引流的征象；当以皮层静脉引流为主时，颅内常可检出流速增高的侧裂静脉。

Further, author introduces the concept of many kinds velocity and their inherent physical meaning, and then discusses the theory foundation and methods of migration velocity error analysis based on the acoustic wave equation.

进而，介绍了各种速度概念及其内在的物理涵义，讨论了基于波动方程的偏移速度误差分析理论基础及其方法原理。

By means of the present model certain phenomena related to the nonlinear acoustic properties of an orifice, such as the roll-up of the shed vortex sheet and the forming of the Vena-Contracta are simulated. For a sinusoidal sound pressure, the time- history of the average velocity through the orifice is computed, and the nonlinear distortion of the velocity is examined by means of the Fourier decomposition.

依据此模型，对圆孔声学非线性效应的若干特征现象进行了数值模拟，如脱落涡层的卷曲，Vena收缩段的动态形成；在孔板前声压按余弦规律变化的情况下，计算了孔中平均速度的时间历程，并借助于Fourier分解分析了孔中平均速度的畸变情况。

In contrast,the SAW and PSAW have Δv/v effect.These datashow that the high velocity surface acoustic mode is the high velocity head wave.

这些充分证明了，压电晶体半空间中普遍存在的高速表面模式是我们所预期的高速头波。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。