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The structure-acoustic coupled models of Santana2000 are built both with and without absorption material, and ANSYS finite element analysis software is used to calculate interior acoustic pressure due to panels vibration under specific frequency, then the acoustic contribution of panel is evaluated.

以桑塔那2000型轿车为实例建立无吸声材料和有吸声材料的结构-声学模型,使用ANSYS有限元分析软件计算车身板件在给定频率下振动引起的车内声压,进而求得板件的声学贡献。

Studied every acoustic and vibration characteristics of vehicle system making use of the SEA car model that had been established. Utilizing the specialty of SEA, contrasted the acoustic contributing of panel in every frequency bands by comparing the radiant energy into cab directly with creativity. Compared the effects of every type of factors on the interior acoustic environment of car.

七、利用建立的统计能量分析模型进行车辆系统各个声振特性的分析,研究车辆行驶速度和行驶路面的等级等因素对车内声学环境的影响;利用统计能量分析方法的特点,创造性地通过直接计算仿真实际工况下各个部件对车内辐射能量的对比进行板件各频带声学贡献的分析。

The knowledge of physiological acoustics and psychological acoustics is the basis of the research of 3D sound technology.

对人类生理声学和心理声学的了解是研究三维声音技术的基础。

The loudspeaker device may further include a fourth acoustic driver comprising an axis, arranged along the line so that a projection onto the azimuth plane of the fourth driver axis and the projection of the second driver axis are coincident.

扬声器装置还可以包括具有轴线的第四声学驱动器,沿着所述直线设置所述第四声学驱动器,使得第四驱动器轴线在方位平面的投影和第二驱动器轴线的投影重合。

Chapter Two Further Study On Two Types of Tone Sandhis Supposed by Traditional Dialectology The further study is relied on the research of F0 and elapsed time, and more phonetic dealing with the original data.

对这一问题的分析将基于论文第一章所论述的上海方言单音节声调和两类变调的声学特性(基频F0和时长两因素),以及在这两个基本声学特性上所作的语音学意义上的对数据的进一步处理。

The acoustic analysis by computer technique , aero-dynamic measurement and the examination by laryngoscopy are of value in the diagnosis and treatment of functional dysphonia.

采用喉镜、计算机声学分析和空气动力学检测方法获取喉部图像、嗓音声学及空气动力学特征有助于功能性发声障碍的分类、诊断及鉴别诊断,并为进一步选择合适有效治疗方法提供客观依据,因而这些检测方法在功能性发声障碍中有一定应用价值。

According to the theory of wave acoustics and ray acoustics,train is regarded as a moving limited line sound source and the mathematics model of sound field distribution is set up around the elevated railway.

根据波动声学和几何声学原理,将列车看作一运动着的有限长线声源,建立了有声屏障时城市高架轨道交通沿线声场分布计算模型。

Based on some correlative the theory analysis and conclusion of experiment about impedance muffler, some issues about the foundation of model of leak pipeline are tried instructively and analysis reasonably by the acoustical analysis and the characteristic of acoustical spread in the leak pipeline is studied. The leak detection is a little more wonderful technology which can find the leak and then locate it accurately in virtue of correlation leak detection.

本文综合了有关文献的理论分析和试验结果,从声学的角度对供水管道漏损的声学模型的建立进行了有益的尝试和合理的分析,并对漏损管道内的流体声传播特性进行了研究。

In order to test spectral element method and Newmark time integral, the codes of program and the feasibility of spectral element method for aeroacoustics, One question which has analytical solution and two typical questions of computational aerocaustics are simulated numerically by the program.

为了验证谱元方程和Newmark时间积分方法的正确性、自己所编程序代码的有效性以及谱元方法求解气动声学问题的可行性,本文使用程序分别求解了具有解析解的波动方程和计算气动声学问题中的两个典型问题。

Using fluid dynamics FEM (two dimensional, three dimensional andaxisymmetric) and three dimensional acoustic FEM in meticulous analysis ofexpansion muffler structure, this paper studies the influences of each mufflercomponents' position, dimension, form and quantity on the fluid dynamic andacoustic performances;therefore the paper indicates that the end of the intruding tubeis the linchpin of the fluid dynamic performance of the whole muffler structure, thespringhead of muffler fluid dynamic performance is the smoothness of air current, themain factor which affects the acoustic attenuation value of expansion chamber muffleris the grade of saltation of the section of air conducting access, and the attenuationvalue of specific frequency can be dramatically enhanced by carefully designing thelength of expansion chamber.

本文通过流体力学有限元方法和三维声学有限元方法对扩张腔消声结构的参数化模型进行了细致的分析,研究了这种结构的各个组成部份的位置、大小、形状和数量对其流体力学与声学性能的影响,指出插入管端口是影响整个结构流体力学性能的关键,消声结构流体力学性能的根源是气流通过时的平稳程度;影响扩张腔消声量的主要因素为声波传播通路截面突变的程度,并可以通过精细的设计扩张腔轴向长度获得宽频或指定频率消声量的大幅度提高。

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