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Optimum design for feedforward structural-acoustic control of complex structural systems.

机译:复杂结构系统的前馈结构声控制的优化设计。

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摘要

An efficient design formulation for feedforward Active Structural Acoustic Control (ASAC) systems for complex structures and disturbances is presented. The approach consists in a multi-level optimization procedure. The upper level part is carried out in the modal domain, where the optimum modal control forces and modal error sensor components which minimize the total radiated power are obtained. These optimum modal parameters are then used in a set of lower level optimization problems to find the physical characteristics of the actuators and sensors to be implemented. In this work, the developed formulations are demonstrated in three systems of increasing complexity. First, a simply supported plate excited by at a single frequency is presented. The study of this relatively simple case serves as a benchmark for more complex systems permitting the evaluation of the performance of the design approach. Then, the formulation is implemented for the case of a simply supported cylinder under multiple frequency excitations. In this case numerical techniques are used to obtain the structural and acoustic responses showing the capabilities of the formulations to be implemented to complex structures. In both cases (i.e., the simply supported plate and cylinder), the results show that the optimum configurations yield significant reductions in the total radiated acoustic power depending on the number of control channels and allowed control effort. Moreover, it is demonstrated that the proposed design approach gives a clear insight into the relative contributions of the modes to the sound field providing a better understanding of how they have to be controlled in order to minimize sound radiation. Finally, the design approach is validated in an experimental arrangement for the attenuation of sound radiation from an enclosed box structure under a realistic periodic disturbance. Up to 36dB of attenuation in the acoustic power is obtained in the experiment demonstrating the effectiveness of the proposed design approach for practical applications.
机译:提出了一种用于复杂结构和扰动的前馈主动结构声学控制(ASAC)系统的有效设计公式。该方法包括一个多级优化过程。上级部分在模态域中执行,在模态域中,可获得使总辐射功率最小的最佳模态控制力和模态误差传感器组件。然后,将这些最佳模态参数用于一系列较低级别的优化问题中,以找到要实施的执行器和传感器的物理特性。在这项工作中,已开发出的配方在越来越复杂的三个系统中得到了证明。首先,给出了一个由单个频率激发的简单支撑的板。对这种相对简单的案例的研究可以作为更复杂系统的基准,从而可以评估设计方法的性能。然后,针对在多个频率激励下简单支撑的圆柱体的情况实施该公式。在这种情况下,使用数值技术来获得结构和声学响应,从而表明要对复杂结构实施的配方的功能。在两种情况下(即,简单支撑的板和圆柱体),结果都表明,最佳配置可显着降低总辐射声功率,具体取决于控制通道的数量和允许的控制工作量。而且,证明了所提出的设计方法清楚地了解了模式对声场的相对贡献,从而更好地了解了如何控制模式以最小化声辐射。最后,该设计方法在实验布置中得到了验证,可以在实际的周期性扰动下衰减来自封闭式箱形结构的声音辐射。在实验中获得了高达36dB的声功率衰减,证明了所提出的设计方法在实际应用中的有效性。

著录项

  • 作者

    Rodriguez-Davila, Hector M.;

  • 作者单位

    Virginia Polytechnic Institute and State University.;

  • 授予单位 Virginia Polytechnic Institute and State University.;
  • 学科 Engineering Civil.;Physics Acoustics.
  • 学位 Ph.D.
  • 年度 1996
  • 页码 175 p.
  • 总页数 175
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;声学;
  • 关键词

  • 入库时间 2022-08-17 11:49:24

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