查询词典 acoustical

According to the studied results at present, the studied objects are mainly thin plate and beam about sound radiation mode, a method computed sound radiation mode of complex structure is presented in this dissertation, according to the results of the previous two chapter, a theoretical method to solve acoustical radiation mode and acoustical radiation efficiency of complex structure by boundary element method and acoustical radiation theory is posed, the acoustical radiation power is expressed as a Hermitian quadratic form, while the radiation modes is determined by general eigenvalue decomposing, and then the radiation efficiency is computed via the orthodoxy of radiation modes with regard to impedance matrix and average velocity matrix; lastly, the validity of the method is proved by pulsating sphere and radiating cube with analytical results. According to results of the form three chapter, the structure sound radiation sensitivity is studied in detail, the sound radiation power of structure can be expressed as positive Hermitian quadratic form, the sound radiation sensitivity can be expressed as two parts by partial differential with respect to design variable, which are sensitivity of boundary velocity and impedance matrix, combined with the theory of FEM and BEM, the structure sound radiation can be translated to the analysis of structure dynamic sensitivity and impedance matrix sensitivity. The theory posted in this dissertation is tested by the FEM software ANSYS and the software AAS programmed by author.

在前几章的基础上，通过结构声辐射的模态理论对结构的声辐射的机理进行了深入地探讨，针对目前声辐射模态的研究对象主要是简单的板和梁类结构，提出了一种计算复杂结构声辐射模态的方法，利用前两章研究所得的结论，将边界元方法与广义特征值的理论结合起来研究了复杂结构的声辐射模态与声辐射效率，先将结构的声辐射功率表示为一个正定的厄米特二(来源：ABb7C论文0909网www.abclunwen.com)次型，运用广义特征值分解求解了复杂结构的声辐射模态，然后利用声辐射模态关于阻抗矩阵与均方速度耦合矩阵的正交性，求解了复杂结构的声辐射效率，最后用具有解析解的脉动球与辐射立方体验证了该方法的有效性。

The objective acoustical parameters and binaural room impulse response at different listening positions with different acoustical characteristics in classroom are obtained by using architectural acoustical simulation software ODEON.

应用建筑声学仿真软件ODEON仿真获取教室中具有不同声学特性的听音位置的客观声学参数和双耳房间脉冲响应。

The Conrad Prebys Music Center's larger 400-seat concert hall follows the physical approach to acoustical design—in this case the inspired work of legendary acoustician Cyril Harris in collaboration with Ashton Taylor of HFP Acoustical Consultants in Houston.

康拉德。普利贝斯音乐中心的另一个较大的400座音乐厅采取了物理改变的方式进行声学设计-这样，印象深刻的杰作是由富有传奇色彩的声学家西里尔。

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。

Through the acoustical design of Nanjing Olympic sports center, it is found that many aspects of the existing code for acoustical design on gymnasiums deserve to be discussed, especially for large and overlarge gymnasiums.

国家体育场馆建设行业标准已对建筑声学指标做了明确规定，在对南京奥体中心体育馆进行声学设计时，发现现行体育馆声学标准还有值得商榷的地方，特别是对大型或特大型体育馆。

There is one way that offers a certain acoustical advantage, but....

我的意思是：好象只有那样才能让他听见，但是

It has been designed for acoustical technicians, sound engineers, scientists and students.

它被设计的声学技术，健全的工程师，科学家和学生。

music is one kind of acoustical art.

音乐是听觉艺术。

With the development of education, the classroom acoustical environment has become one of the important objects in the research of acoustics.

本文的目的和意义在于针对我国经济发展水平的现状，对教室的声学环境进行研究。

This model can be used to noise control engineering, as well as to the practice of acoustical design.

该方法可用于厂房、办公室等场所的噪声控制及室内音质设计的实践中，并可进一步应用于声场可听化研究，具有广阔的应用前景。

In this new architectural plan the Garden of Golgotha came to be at the centre of the new city.

Aelia 是高举他自己，并在此城内朝拜罗马诸神。

The continuous nature of peat accumulation means that terrestrial coaly rocks may provide a higher resolution and more complete record of base-level change than the time-equivalent shallow-marine strata, thus enabling the identification of highfrequency cycles that are not recorded in themarine strata.

泥炭积累的持续性质的手段，陆地coaly岩石可提供较高的分辨率和更完整的记录基准面变化的影响时，相当于浅海阶层，从而使确定的高频周期，不记录在themarine 阶层。