CAREER: Cochlear Analogues for Engineering Acoustics

卡尔Grosh，里根大学9876130工程声学的相干辐射模拟相干辐射力学，工程声学和主动结构是研究领域，其中激烈和令人兴奋的工作正在进行中。 在这个研究计划中，这三个看似不同的领域被结合在一起。哺乳动物听觉的表现结合了显著的瞬态捕获和频率滤波，动态范围可以包含至少一百万倍的能量变化。 耳蜗的机械、流体动力学和电功能在很大程度上负责这些规格，这些规格在人造机械系统中是无与伦比的。 虽然目前对耳蜗功能的理解还不完整，但本研究旨在利用这种进化设计的已知结构-功能关系进行工程声学。 对于从声音静音到声音感测的应用，耳蜗模拟设计在提高频率选择性和灵敏度方面具有巨大潜力。 一种这样的应用集中于利用耳蜗的结构声学滤波来进行声音衰减，即，作为一种安静的机制，以增加甚至取代广泛使用的消音器（如消声器）。 本文还研究了一种基于耳蜗的传声器和水听器换能器。 先进的非定常流体-结构相互作用问题的建模进行提供设计工具和理解的现象。 液压和空气传播的声学系统的设计的各种实现建模，建造和测试。 这一系列研究的成功将显著改变声音静音（例如，消声器）和换能器（例如，麦克风）工业。 此外，更好地理解耳蜗类似物将提供对听觉过程本身的更好理解。该资助的教育部分旨在（1）将现代软件，包括计算，分析和图形软件包整合到课堂环境中，（2）通过将案例研究引入课堂来增加行业相关性，这些案例研究来自行业赞助的研究项目和行业贡献的案例研究。

Karl Grosh, University of Michigan9876130Cochlear Analogues for Engineering AcousticsCochlear mechanics, engineering acoustics and active structures are fields of research where intense and exciting work is underway. In this research proposal, the three seemingly disparate areas are brought together. The performance of mammalian hearing combines remarkable transient capture and frequency filtering, with a dynamic range that can encompass at least a million-fold change in energy. The mechanical, fluid dynamical and electrical functions of the cochlea are largely responsible for these specifications, specifications which are unparalleled in man-made mechanical systems. While the current state of understanding of the function of the cochlea is incomplete, this research seeks to take advantage of the known structure-function relations of this evolutionary design for engineering acoustics. For applications ranging from sound quieting to sound sensing, the cochlear analogue design holds great potential for improving frequency selectivity and sensitivity. One such application centers on utilizing the structural acoustic filtering of the cochlea for sound attenuation, i.e., as a quieting mechanism, to augment and even replace widely used silencers (such as mufflers). A cochlear-based microphone and hydrophone transducer is also studied. Advanced modeling of the unsteady fluid-structure interaction problem is undertaken to provide design tools and to understand phenomena. Various realizations of designs for hydraulic and air borne acoustic systems are modeled, built and tested. The success of this line of research will significantly change the sound quieting (e.g., muffler) and transducer (e.g., microphone) industries. In addition, better understanding of cochlear analogues will provide a better understanding of hearing processes themselves.The educational portion of this grant seeks to (1) integrate modern software including computational, analytic and graphical packages into the classroom setting and (2) increase industrial relevance by introducing case studies to classroom, stemming from both industry sponsored research projects and industry contributed case studies.