声速

The simulation results show that there are many factors to influence the reverberation, each of them has different contribution to the reverberation, and the angles configurations and the characters of interface have main function, and the effect of the change of sound velocity on reverberation can be ignored.

模型仿真结果表明，影响双基地声纳混响的因素众多，每个因素在对双基地混响的贡献是不一样的，双基地角度的配置和界面性质变化对混响的影响很大，而声速的变化对混响的影响可以忽略不计。

The paper analyzed variation of temperature, density and velocity of sound in the west pacific based on LEVITUS database using CSIR.

利用样条插值重构方法对LEVITUS数据库中的温度、密度和声速的月平均变化规律进行了分析，得到的海洋要素平面分布。

The phylogeny and applied prospect of MES are summarized in the paper. The principle of this system is analyzed from the point of view of acoustics. The surveying and filtering technology of auxiliary parameters, sounding data and the theory of image form, backscatter strength data processing, are researched deeply in the paper. The optimal model of velocity of sound is given. For sound ray tracing, some methods of correction of sound ray curve are developed. At the same time, an ideal model of sound ray tracing is proved and given. The GPS technology is applied for the determination of tide, attitude of vessel. Moreover, some methods are given. As an important topic, the systematic error is discussed in the paper. Some filtering methods are researched in this paper. Based on the current methods of image processing, the procedure and methods are tested and given that adapt to sonar image processing.

本文研究的工作是在总结多波束声纳测深系统的发展历史、应用前景的基础上，从声学角度分析了多波束系统的工作原理；对多波束辅助参数的测定和滤波方法、测深数据的滤波方法、多波束声纳图像的形成机理、图像处理以及最终应用等作了比较深入的研究；得出了适合于多波束精密深度计算的最优声速模型和声线改正模型；提出了 GPS 载波相位定位技术用于多波束辅助参数测量的思想、算法，改善了多波束系统的作业模式；系统地分析了深度数据的误差来源和类型，首次将系统误差作为影响测深精度的主要因素给以研究，并给出了削弱系统误差的方法，提高了深度数据的质量；对多波束声纳图像的形成、处理方法进行了细致的研究，给出了适合多波束图像处理的算法和流程，并从理论和实践上对声纳图像的应用进行了比较全面的研究。

Based on the analysis of logging data, i t is found that effect of porosity and s hale content on acoustic velocity is hea vier than that of water saturation on it .

根据对实测测井解释资料的分析，认为孔隙度和泥质含量对纵波声速的影响大于含水饱和度的影响。

Thirdly, the evolving process of the vortical structure and its singularity characteristic are also analyzed.

给出了高超声速圆球绕流尾迹结构的周期性演化过程，对其涡系结构的演化及奇点特征进行了分析。

The frequency, wave lenth, and speed of sound are closely related.

频率，波长和声速三者是密切相关的。

The experment results show that the velocity of shock wave approximate equals tothe sound speed of water.

实验结果表明，冲击波的传播速度约等于水中声速。

The experiment was done in the pressure-vacuum supersonic wind tunnel of Muroran Institute of Technology of Japan.

实验是在日本室兰工业大学的压力—真空型超声速风洞中进行的。

In order to improving system's precision, many techniques such as improving precision of calculagraph ,using various of filters, on-line temperature compensator, echo location criterion are needed and designed.

为了提高系统测量的准确性和精度，采用了提高计时器分辨率、多重滤波、声速校正以及波形分析算法等措施。

In order to simulate the liquid fuel atomization in supersonic crossflow, a hybrid spray atomization model was developed.

为了模拟超声速气流中液体射流的雾化，发展了一种液滴破碎混合模型。

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。