非线性声学

本文以非线性声学为基础，从KZK方程入手，综合考虑了超声波在空气中传播的衍射效应、非线性效应和吸收效应，对超声波在空气中传播的指向性进行了比较深入的研究。

Based on the nonlinear acoustics and KZK equation , the diffraction , nonlinear and absorption effects are included in simulation . The research is about the directivity of ultrasonic in the air .

非线性声学和时间反转声学在材料缺陷识别中的应用现状评述

Review of the Current Application of Nonlinear Acoustics and Time Reversal Acoustics in Material Defects Identification

流体非线性声学参量B／A的分子热力学研究

Acoustical nonlinearity parameter of liquid derived from molecular thermodynamic method

包括新型水声换能器材料、水中非线性声学、匹配场过滤、宽容性信号处理、水声通信、合成孔径成象技术、数据融合、声层析、水下GPS技术等。

Which include new type of transducer materials , non-linear underwater acoustics , matched filter processing , robust signal processing , underwater communication , synthetic aperture imaging technique , data fusion , acoustic tomography , underwater GPS technique etc.

解释非线性声学参量B/A的Rao流体理论定性说明了流体的非线性性质，但不能定量计算。

The explanation of non-linear vocal parameter B / A 's Rao Liquid Theory Orientation displays the non-linear nature of liquidity , but cannot be measured by quantity .

铝合金板材缺陷非线性声学特性研究

Study on Non-linear Acoustics Characterization of Cracks in Aluminum Alloy Plate

非线性声学简介与在医学诊断中的应用

The introductions on non-linear acoustics and its applications in medical diagnosis

生物媒质中非线性声学参量B/A的研究

Study of acoustical nonlinearity b / a in biological medium

本文讨论空气声中的非线性声学。

Significance of non - linear acoustics in aerial sound is discussed .

利用非线性声学测量冰厚的方法研究

The Method for Measuring Ice Interface Using NOn-linear Acoustics

高声压级时穿孔结构非线性声学特性的研究

Study of nonlinear acoustic characteristics of perforated constructions at high sound pressure levels

超声造影微泡非线性声学特性与成像研究进展

Nonlinear properties of ultrasound contrast microbubbles and their application in nonlinear ultrasound contrast imaging

非线性声学谐波方程的特解及其在边值问题中的应用

Special solution of second harmonic wave equation in nonlinear acoustics and applications to boundary-value problem

非线性声学对医学超声诊断与治疗都具有非常重要的现实意义。

Therefore , the nonlinear acoustics concerning medical ultrasound diagnosis and cure has very important realistic significance .

非线性声学主要研究非线性声波方程以及由此引起的一系列非线性现象和规律的问题。

Nonlinear acoustic mainly study on non-linear acoustic equation and a series of nonlinear phenomenon arouse from it .

由于空气的非线性声学效应，在传播过程中声波中的音频信号会自解调出来，可以被人耳直接听到。

During the propagation of the sound wave , the audio signal is regenerated by self-demodulation due to the nonlinearity of air .

液态和超临界态二氧化碳的非线性声学性质超导薄膜临界磁场的非线性非局域效应研究

Nonlinear acoustical properties of liquid and supercritical carbon dioxide Discussion on the Nonlinear and Unlimited Features of the Critical Magnetic Field in Super-conduct Pellicle

参量扬声器系统的实现包含了多种学科知识即非线性声学、电子工程学以及计算机科学等。

The realization of parametric loudspeaker system involves the knowledge of many disciplines , including non-linear acoustics , electronic engineering , computer science and etc.

随着科学研究的发展，基于非线性声学的参量阵声纳近年来在国内外工程中得到了广泛的应用。

As the development of science research , parametric array sonar based on nonlinear acoustics has been widely used in engineering domain internal and abroad .

他还积极从事有源噪声控制和非线性声学的研究，并取得了显著成果。

He has also made some remarkable achievements in the field of active noise control and nonlinear acoustics , and is still active in research work .

无损评价。它是非线性声学最有潜力的应用，因为材料的缺陷是与强的非线性特性紧密相连；

Nondestructive evaluation : this is the most potential application of nonlinear acoustics , because the fatigue of material is closely related to high nonlinear acoustic behaviors .

宽带噪声激励下穿孔板结构非线性声学特性的研究在消声器壳体内设置穿孔板，可以显著提高消声器的传递损失，增加降噪效果。

A study of the acoustic nonlinearity of a perforated plate construction under broad-band noise excitation Micro perforated plate in the cylindrical muffler also increased the noise reduction .

由于热声振荡现象中涉及复杂的交变流动与传热以及非线性声学等难题，热声振荡机理一直没有得到完整、准确解释。

Because of the complex oscillation flow and heat exchange , and the nonlinear acoustics involved in the thermoacoustic effects , the oscillation mechanism of thermoacoustic effects has not be fully understood .

概述了大气声学与非线性声学的主要内容及其进展，并分析了非线性声学的理论和技术在大气声学研究中的应用前景。

The main content and progression of atmospheric sound and nonlinear sund are summarized , the applying prospects of the theory and technology , of nonlinear sound in the study of atmospheric sound are analyzed .

最后总结了铝合金板材中超声波缺陷检测的非线性声学与时间反转法相结合的探测方法，给出了缺陷定性、定位的方法。

In the end , summarizing the testing method combined by non-liner acoustic and time reversal method in the defect detection , giving the method to determine the nature and direct current position of cracks .

主要包括以下几个方面：1.以非线性声学为基础，研究了声学参量阵的产生机理，并对其理论进行了比较详细和系统的研究。

The main contents of the study include : 1 . Based on the theory of nonlinear acoustics , the theory which makes parametric acoustic array generating was researched detailed and systematically , along with the principle .

本文用插入取代法测量和研究了猪全血、牛全血、牛奶和各种分子量的聚乙二醇水溶液等多种液态生物样品中的非线性声学参量B/A值。

By using insert substitution method , the acoustical parameter of nonlinearity B / A have been determined for a series of liquid biological samples : porcine whole blood , bovine whole blood , milk and aqueous solutions of polyethylene glycol of various molecular weight .

应用分离变量法及拉格朗日变动参数法求它的特解，出现了待定的分离常数，给这类非线性声学边值问题带来困难。

In order to find its special solution , the method of separated variables as well as Lagrange 's method of variation parameters were invoked , and a trouble to the boundary-value problem of nonlinear acoustics will consequently result in that a separation constant is to be determined .

实际房间声学系统是否具有非线性确定性是声学信号处理中值得研究的问题。

In acoustic signal processing , it is valuable to determine whether a real mom acoustic system is nonlinear deterministic .

岩石、混凝土等非线性介观弹性固体材料显示出与经典的非线性声学不同的非经典非线性声学现象，比如滞后现象、离散记忆等。

Nonclassical nonlinear acoustic phenomena such as hysteresis and discrete memory are shown in rock and concrete and other mesoscopic elastic material , which are different from classical nonlinear acoustics .