Plant matrix consideration in active control, adaptive sound field reproduction and time-reversal acoustics

主动控制、自适应声场再现和时间反转声学中的植物矩阵考虑

• 批准号: 138182-2006
• 负责人: Berry, Alain
• 金额: $ 2.91万
• 依托单位: Université de Sherbrooke
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=333981
• 关键词: Plant; matrix; consideration; active; control

A large number of problems in acoustics and vibration of continuous domains involve a set of sources (or actuators) and a set of receivers (or sensors) distributed in the continuum. This is the case in active noise and vibration control, in adaptive sound field reproduction, in time-reversal mirrors and to some extent in inverse vibroacoustic problems, all areas in which I had some interest recently. Although traditionally investigated separately, all of these problems fundamentally rely on a few properties of the plant matrix, the matrix of linear transfer functions between each actuator and each sensor through the propagation medium. It is the purpose of this proposal to contribute to the advancement of multi-channel active control, multi-channel sound field reproduction and vibroacoustic time-reversal techniques, under the specific angle of exploiting and possibly optimizing the properties of the plant matrix. 1- In active noise and vibration control, we are especially interested in decentralized architectures, i.e. independent control loops between one actuator and one sensor. This leads to neglecting off-diagonal coefficients of the plant matrix and results in a much simpler and robust practical implementation. 2- The objective of sound field reproduction - to reproduce an extended wave field in an arbitrary environment using a set of reproduction sources- finds applications in music or audio reproduction. In this topic we want to improve sound field reproduction techniques in realistic and possibly changing environments using adaptive control techniques. 3- Time reversal acoustics is a fascinating and rapidly growing technique that uses a "mirror" - a set of reciprocal transducers - to observe, store and re-emit (after time inversion) an arbitrary wave field to create its time-inverted image. In this topic, we want to exploit the focusing properties of time reversal mirrors to pinpoint the vibration sources on an extended, complex structure, or the acoustic sources on an extended, complex radiator.

连续域的声学和振动中的许多问题都涉及分布在连续域中的一组源（或致动器）和一组接收器（或传感器）。在主动噪声和振动控制、自适应声场再现、时间反转镜以及某种程度上的逆振动声学问题中都是如此，这些都是我最近感兴趣的领域。虽然传统上是单独研究的，但所有这些问题基本上都依赖于植物矩阵的一些特性，即通过传播介质在每个执行器和每个传感器之间的线性传递函数矩阵。本文的目的是在开发和优化植物基质特性的特定角度下，为多通道主动控制、多通道声场再现和振动声时间反转技术的发展做出贡献。1-在主动噪声和振动控制中，我们对分散架构特别感兴趣，即一个执行器和一个传感器之间的独立控制回路。这导致忽略植物矩阵的非对角线系数，并导致一个更简单和健壮的实际实现。声场再现的目的是利用一组再现源在任意环境中再现扩展的波场，在音乐或音频再现中得到应用。在这个主题中，我们想要改进声场再现技术在现实和可能变化的环境中使用自适应控制技术。时间反转声学是一项引人入胜且发展迅速的技术，它使用“镜子”-一组互反换能器-来观察，存储和重新发射（在时间反转之后）任意波场以创建其时间反转图像。在本课题中，我们希望利用时间反转镜的聚焦特性来精确定位扩展的复杂结构上的振动源或扩展的复杂散热器上的声源。