光比声传播速度快。
海面与海底构成了声源浅海海域波导场的声传播环境。
Sea surface and bottom constituted sound propagation environment of the neritic acoustic duct field.
从颗粒介质模型出发，对粮食中声传播性质进行了研究。
With kernel medium model, sound propagation characteristic in grain is studied.
本文引入两个与声衰减有关的介质参量，定义了声传播系数；
Two new medium parameters related to acoustic attenuation are introduced and an acoustic propagation coefficient is defined.
考察了海底沉积物参数、声源激发主频等对低频声传播的影响。
The effects of the sea sediment parameters and center frequency of the source on the low frequency acoustic wave propagation in shallow water are investigated.
实验结果表明，水中的声传播速度大于聚合物溶液中的声传播速度。
It is shown that acoustic velocity of tap water is faster than that of the polymer solution.
文中分析了高空气象条件与声传播的关系，并通过能听度评估气象条件。
This paper analyses the connection between high altitude weather information and sound propagation in the atmosphere, and evaluates the weather information by audibility.
射线模型是比较常见的传播模型之一，可以用于不规则海域声传播建模。
Ray model is one of the conventional sound propagation models, which can be used to model the sound propagation in the irregular ocean environment.
本文对管道声传播数值计算提出了一组判据，用来衡量数值计算的可靠性；
Computational criteria used to judge the correctness of numerical calculation for sound propagation in ducts, are presented in the paper.
无论对声传播还是声激振动，电流变材料的影响都是随频率变化而变化的。
The ERF has no obvious effects on sound insolating in moderate or high frequencies, but has apparent effect on th…
狭长空间声传播特性研究对于地铁、长廊等场所的音质设计是非常有意义的。
The study on sound distribution in long and narrow enclosures is very valuable to the design of such site as subway station.
应用简正波理论并结合波数积分法，建立了浅海低频声传播特性的仿真数学模型。
Using the Normal Model Theory and Wavenumber Integration Method, a low frequency acoustic wave propagation model in shallow sea of multi-layered media is constituted.
采用有限元和无限元技术，用统一的方法模拟流动噪声、振动噪声及声传播问题。
Use finite element and infinite element technology, and unified method to simulate flow noise, vibration noise and sound propagation.
本文研究了借助于系统地调控结构声传播性态以达到降低工程结构噪声目标的方法。
The paper discusses noise reduction in technical structures by means of systematically manipulating structure borne sound propagation.
采用计算气动声学方法研究了管道近音速区的声传播和声波与激波的相互作用问题。
A computational aeroacoustics approach is applied to studying sound propagation in subsonic and supersonic nozzle.
同时，利用理论和数值相结合的方法计算和分析了热粘性效应对较粗管道中声传播的影响。
At the same time, a hybrid numerical and analytical method is used to calculate and analyse the visco-thermal effect on the sound propagation in wider ducts.
随着聚合物溶液浓度的增加，其声传播速度减小，其密度值也逐渐减小，但其表观粘度值逐渐增大。
With the concentration of the polymer solution increasing, acoustic velocity of the polymer solution decreases, and the polymer density decreases too, but the apparent viscosity increases.
声场仿真是研究舰船声场和海洋声环境的重要手段，而声传播特性仿真是建立声场环境的关键一环。
Acoustic field simulation is an important part in sea combat field simulation. It is a key step to establish an acoustic wave propagation model in an underwater acoustic field.
在波动传播理论的基础上，简要介绍了几种主要声传播模型的基本原理，并着重对简正波模型进行了研究。
Based on wave propagation theory, the paper describes briefly basic principle of several acoustic propagation models, and discusses detailedly foundation of coupled normal mode.
结果表明：空气中风速剖面和声速剖面对空气中声传播有很大影响，但对于透射进入水中的声波影响很小。
The results show that wind and the sound speed profile have little influence on air-to-water sound transmission.
金刚石具有最高的声传播速度和极高的杨氏模量，以及优异的机械和化学性能，在声学方面具有广阔的应用前景。
Diamond has the highest acoustic velocity, high Young's modulus and excellent mechanical and chemical properties, so have broad application in the field of acoustic devices.
海洋中尺度现象，是引起实际海洋环境空间分布变化的主要因素，它直接影响到声速剖面结构特征，并进一步影响海区的声传播特性。
Mesoscale phenomena has been considered to be the main contribution of the temporal and spatial variation in the actual ocean environment.
目前硅气凝胶是世界上最轻、隔热性最好、孔隙率较高且声传播速率较低的固体材料，由于其特殊的网络结构使其具有很多独特的性能。
Presently, silica aerogels are the lightest solid material which have the best property in thermal insulation and have the higher porosity, the lower sound velocities in the world.
为验证正确与否，文中试算了两个实例并分别用理论和试验方法加以证明。最后，本文根据计算得出的声场情况初步分析了一些二维声传播现象。
As a check, two actual examples are calculated and good agreement exists between finite-element approach and simple plane-wave theory at most of frequencies.
声比光传播得慢。
正是由于这种集声，即使是海洋中相对微弱的声音，尤其是低频声音，也能传播数千英里。
This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles.
海豚发出的滴答声是如何从充满空气的鼻囊传播到海水中的呢？
How did the dolphin's clicks get transmitted from its air-filled nasal sacs into the ocean water?
海豚发出的滴答声是如何从充满空气的鼻囊传播到海水中的呢？
How did the dolphin's clicks get transmitted from its air-filled nasal sacs into the ocean water?
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