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Design, analysis and characterization of a miniature second-order directional microphone.

机译：微型二阶定向麦克风的设计，分析和表征。

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摘要

Presented in this dissertation are the design and analysis of a first order directional comb finger microphone. The first order microphone diaphragm has a simple and very small mechanical structure so that the complexity of fabrication process can be reduced. An analytical model and a finite element model are developed to predict the characteristics of the diaphragm, such as natural frequencies, mode shapes and the acoustic response due to sound. Also, the comparison of the predicted and the measured results is presented in the dissertation.;Based on the first order directional comb finger microphone, a miniature second-order directional microphone diaphragm is developed, which consists of two first order microphone diaphragms. The design and analysis of the second order directional microphone diaphragm is presented in the dissertation. It involves the detailed analytical model and the finite element model of the diaphragm to predict the mode shapes, the natural frequencies and the responses of the diaphragm. The second order directional response of the diaphragm in the first mode has been achieved through carefully designing the mechanical structure of the diaphragm by optimizing its directivity index. In order to diminish the unwanted responses of the diaphragm in the third and second modes, which dominated in the total response and results in the omni-and first order directional response, the new designs of the microphone is introduced, in which the diaphragm is compliantly suspended over an enclosed air volume or a pair of separate air volumes. The analytical model is extended to account for the effects of air in the back volume that acts like a linear spring. From the extended model, the directivity of the microphone is predicted by using the numerical method. Due to the effects of air in the separate volumes, the second order directional pattern of the response of the diaphragm is achieved.
机译：本文提出的是一阶定向梳齿式麦克风的设计与分析。一阶传声器膜片具有简单且非常小的机械结构，因此可以降低制造过程的复杂性。开发了一个分析模型和一个有限元模型来预测振动膜的特性，例如固有频率，振型和声音引起的声学响应。论文还对预测结果与实测结果进行了比较。基于一阶定向梳状麦克风，研制了一种微型的二阶定向麦克风振膜，它由两个一阶麦克风振膜组成。本文介绍了二阶定向传声器振膜的设计与分析。它涉及振动膜的详细分析模型和有限元模型，以预测振动膜的模式形状，固有频率和响应。通过优化膜片的方向性指标来精心设计膜片的机械结构，可以实现膜片在第一模式下的二阶方向响应。为了减少振动膜在第三和第二模式中的不想要的响应，该响应在总响应中占主导地位，并导致全方向和一阶方向响应，因此引入了麦克风的新设计，在该设计中，振动膜是顺应性的悬挂在封闭的空气量或一对独立的空气量上。扩展了分析模型，以解决后体积中的空气影响，该作用类似于线性弹簧。从扩展模型中，使用数值方法来预测麦克风的方向性。由于空气在单独的空间中的作用，因此获得了膜片响应的二阶方向图。

著录项

  • 作者

    Huo, Xiping.;

  • 作者单位

    State University of New York at Binghamton.;

  • 授予单位 State University of New York at Binghamton.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 176 p.
  • 总页数 176
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

  • 入库时间 2022-08-17 11:38:29

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