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Vibration suppression of rotating beams through piezoelectric shunt circuits.

机译：通过压电分流电路抑制旋转梁的振动。

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摘要

This thesis analytically investigates the feasibility of passive vibration damping of a rotating beam-like structure, such as a helicopter rotor, through the use of piezoelectric materials. Piezoelectric materials are unique, in that, they produce an electrical charge under the presence of mechanical stresses. Conversely, they generate mechanical stresses under applied electrical loads. When mounted to a structure undergoing bending stresses, such as a cantilever beam, there is an exchange of mechanical and electrical energy between the beam and the piezoelectric material. This electrical energy can be used to power small electronics such as onboard data transmitters. This energy can also be dissipated through electrical shunt circuits rather than being harvested for external use. Electrical components in a shunt circuit (resistors, capacitors, and inductors) release energy from the system as Joule heat. Energy dissipation corresponds to a vibration damping effect in the electromechanical system. Numerous configurations of electrical components and mechanical structures are explored. First, the Rayleigh-Ritz method of assumed modes is adopted for a rotating uniform single degree-of-freedom cantilever beam. Both in-plane (lag) and out-of-plane (flap) bending directions are considered. The beam model is modified to include piezoelectric elements and electrical shunt circuits. Two types of shunt circuits are considered: one with a single resistive element and one with a resistor and inductor in series. Various resistances are used in finding the frequency and impulse responses of the rotating beam with a shunt circuit. The change in damping potential between resistors is evaluated for each electromechanical system. The effects of the number of modes assumed when modeling the beam are also highlighted. Single-mode approximations are found to be helpful in understanding the foundations of the physics in the beam/piezo systems. It is also determined that multiple-mode approximations account for important electromechanical behavior that is neglected by the single-mode formulations. The settling times of the impulse responses are used as the figure of merit to assess energy dissipation in the systems. Successful vibration damping of rotating cantilever beams is predicted through the piezoelectric shunt circuits.
机译：本文分析地研究了通过使用压电材料对旋转式梁状结构（例如直升机旋翼）进行被动减振的可行性。压电材料的独特之处在于，它们在存在机械应力的情况下会产生电荷。相反，它们在施加的电负载下会产生机械应力。当安装到承受弯曲应力的结构（例如悬臂梁）上时，在梁和压电材料之间会交换机械能和电能。该电能可用于为小型电子设备（如车载数据发送器）供电。该能量还可以通过分流电路消散，而不是被收集起来供外部使用。并联电路中的电气组件（电阻器，电容器和电感器）通过焦耳热从系统释放能量。能量耗散对应于机电系统中的减振效果。探索了电气部件和机械结构的多种配置。首先，对旋转均匀的单自由度悬臂梁采用假定模式的瑞利-里兹方法。同时考虑了平面内（滞后）和平面外（折翼）弯曲方向。修改梁模型以包括压电元件和电气分流电路。考虑两种类型的并联电路：一种具有单个电阻元件，另一种具有串联的电阻器和电感器。在使用分流电路寻找旋转光束的频率和脉冲响应时，会使用各种电阻。针对每个机电系统评估电阻器之间的阻尼电势变化。还突出显示了在对光束建模时假定的模式数量的影响。发现单模近似有助于理解梁/压电系统中物理学的基础。还确定多模近似解释了重要的机电行为，而单模公式忽略了这一行为。脉冲响应的建立时间用作评估系统中能量耗散的品质因数。通过压电分流电路可以预测旋转悬臂梁的成功减振。

著录项

  • 作者

    Powell, Preston.;

  • 作者单位

    The University of Alabama.;

  • 授予单位 The University of Alabama.;
  • 学科 Aerospace engineering.
  • 学位 M.S.
  • 年度 2016
  • 页码 103 p.
  • 总页数 103
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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