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An investigation of active structural acoustic control in resonant enclosures.

机译:共振箱体中主动结构声控制的研究。

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摘要

This dissertation explores two topics in applied structural acoustics. First is the development of a methodology for passive redesign of the plate structure that decreases acoustic-structure coupling and the sound level in acoustic enclosures. The second topic explores the development and implementation of MIMO controllers that were robust and produced meaningful reductions of SPL in the destination enclosure. The scope of this work involved the modeling, simulation, construction, and implementation of these passive and active control concepts. Their performance was evaluated in both simulation and experiment tests.;First a passive design methodology based on a parametrically defined FEM (finite element method) model, coupled to a BEM (boundary element method) acoustic model by the modal interaction model approach was developed. Then using FEMLAB (a finite element toolbox for Matlab), a model of the plate was developed and exported as m-code for sensitivity studies and design optimization. Numerous control approaches were then simulated on the state space model of the 3-D enclosure system. These simulations explored different algorithms, controller structures, and system arrangements to determine what approaches were best suited to the ASAC problem. Based on these simulations the required setups and control electronics hardware were designed and built. Then the experimental setup was identified for control design using a variety of standard frequency domain approaches. Finally these control design models were utilized to design and implement controller in experiment. The results and intuitions gained in this investigation are then discussed.
机译:本文探讨了应用结构声学中的两个主题。首先是开发一种用于被动重新设计板结构的方法,该方法可减少声学结构耦合和声学外壳中的声级。第二个主题探讨了MIMO控制器的开发和实现,该控制器的功能强大且可有效降低目标机柜中的SPL。这项工作的范围涉及这些被动和主动控制概念的建模,仿真,构造和实现。在仿真和实验测试中都评估了它们的性能。首先,开发了一种基于参数定义的FEM(有限元方法)模型的被动设计方法,并通过模态相互作用模型方法将其与BEM(边界元方法)声学模型耦合。然后使用FEMLAB(用于Matlab的有限元工具箱)开发板的模型,并以m代码形式导出,以进行敏感性研究和设计优化。然后在3-D外壳系统的状态空间模型上模拟了许多控制方法。这些模拟探索了不同的算法,控制器结构和系统布置,以确定哪种方法最适合ASAC问题。基于这些仿真,设计并构建了所需的设置和控制电子硬件。然后,使用各种标准频域方法确定用于控制设计的实验装置。最后,利用这些控制设计模型在实验中设计并实现了控制器。然后讨论了在这项调查中获得的结果和直觉。

著录项

  • 作者

    Whitmer, Christopher Eldon.;

  • 作者单位

    Iowa State University.;

  • 授予单位 Iowa State University.;
  • 学科 Engineering Mechanical.;Physics Acoustics.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 212 p.
  • 总页数 212
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;声学;
  • 关键词

  • 入库时间 2022-08-17 11:37:41

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