声学

It is useful to the measurement of transmitted time of sound wave in acoustic pyrometry and to the sound source location of 'four-tubes' leaking in boiler based on TDE.

不仅为声学测温中的声波飞渡时间测量提供了指导，而且对基于时延估计的锅炉四管爆漏声源定位有一定的参考价值。

The accurate transmitted time of sound wave in acoustic pyrometry has the vital significance.But it possibly enables the background noise to change when the boiler under the different capacity,the different load,and the different time.

准确的声波飞渡时间在声学测温中具有非常重要的意义，但是不同容量、不同负荷、不同时刻下运行的锅炉都可能使得背景噪声发生变化。

Experiment on acoustic pyrometry is done using the chirp signal, white noise and sine wave respectively in a 300MW boiler in one domestic power plant, through fire hole on furnace wall.

在国内某电厂的300MW机组锅炉上，利用炉墙上的观火孔，分别用扫频信号、白噪声信号和正弦信号进行了冷态下的声学测温试验。

Acoustic pyrometry ; furnace ; cross-correlation ; chirp signal ; combustion noise

声学测温；炉膛；互相关；扫频信号；燃烧噪声

Lu J. Acoustic computer tomgraphic pyrometry for two-dimensional measurement of gases taking into account the effect of refraction of sound wave paths .

田丰，孙小平，邓福军，邵富群，王福利。声学法电站锅炉温度场重建算法的研究与比较。量子电子学报， 2003， 20(5)： 607～612薛飞，黄国权，李晓东等。CCD计测量燃烧室截面温度场的原理研究。

This paper reviewed the advances of noise barrier structure in China, and illustrated the development of multiple-edged, T-shaped and Y-shaped top structures used for noise barriers abroad. The development of some new top structures, such as soft surface, quadratic residue diffusers surface of noise barriers was also introduced.

作者对国内声屏障结构形式的现状进行了分析，介绍了国外常见的多重边、T型、Y型等顶部结构的发展情况，同时介绍了声学软表面、平方余数序列表面等新型顶部结构的发展状况。

For the raft, an isoparametric element method and VoigtKelvin model are adopted, which can be used to derive viscoelastic element stiffness matrices, a reform of successive approximation of Rayleigh Quotient is used to solve the eigenvalue problem of the composite structure.

对于筏架结构，采用Voiget-Kelvin模型及等参元法，推导了约束阻尼层单元的刚度阵及将Rayleigh商的迭代步骤加以改进的方法来进行特征分析；对于艇体结构与声学介质耦合部分，采用艇体结构的"干"模态作坐标变换。

In this system, a simple acoustic recognizer is constructed based on VQ, DHMM and One-Pass search algorithm. The baseline system will be the basis of research work in this dissertation.

在这个系统中，以VQ、DHMM和One-Pass搜索算法构成一个较为简单的声学识别器，这个基本识别系统是本文中进一步研究的实验平台和基础。

Acoustic reflectometry is a technique by which the dimensionsof a cavity can be estimated in the form of an area–distanceprofile.

用声学反射计的激素检查可以以面积－深度剖面的形式，评估一个空腔的三维特征。

For the first time, we combined ultrasonic wave and time domain reflectometry to study the relationship between gas hydrate saturation and acoustic parameters in the process of gas hydrate formation and dissociation, and got fine results.

本文首次利用超声和时域反射联合探测技术，研究了沉积物中水合物饱和度与声学特性的关系，并对时间平均方程、伍德及其修正方程、李权重方程和BGTL（Biot-Gassmann Theory by Lee）理论等常用的水合物饱和度估算模型进行了验证。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。