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Piezoelectric ceramic actuators and composite structure for active noise control applications.

机译：压电陶瓷执行器和复合结构，用于主动噪声控制应用。

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摘要

Piezoelectric ceramic actuators with large stroke and low generative force are studied for constructing a new type of air acoustic transducer for low frequency active noise control. The electromechanical performance of cantilever piezoelectric bimorph, unimorph and RAINBOW actuators are studied, both theoretically experimentally. Bimorph has the best electromechanical properties among all the bending actuators. By choosing a suitable thickness ratio of passive layer and piezoelectric layer in unimorph and RAINBOW actuators, maximum tip deflection, blocking force and electromechanical coupling coefficient can be obtained. In high temperature reduction processing of RAINBOW actuator, oxygen diffusion in ceramic layer is the controlling process and a parabolic law is followed between reduction thickness and reaction time in the temperature of 975{dollar}spcirc{dollar}C to 1085{dollar}spcirc{dollar}C. A resonant method is developed for the determination of Young's modulus of the reduced layer of RAINBOW actuator, which is used for further optimal design of RAINBOW actuators. Nonlinear piezoelectric and elastic response contribute significantly to the actuator performance. Two new types of piezoelectric actuators, namely cantilever shear mode actuator and multilayer pseudo-shear mode actuator are developed. In shear mode actuator, large bending deflection is induced by electric field due to its mechanical boundary condition. Multilayer pseudo-shear actuator directly utilizes piezoelectric transverse d{dollar}sb{lcub}31{rcub}{dollar} mode, in which a stack of pre-poled rectangular PZT ceramic sheets are bonded together at alternate ends in such a way that the displacement of the top layer is the sum of all the following layers thus large displacement can be achieved. Pseudo-shear actuator demonstrates larger generative force than bending actuators. A new air acoustic transducer panel, with flextensional displacement amplification mechanism is developed, in which the piezoelectric actuators are used as driving elements. A curved diaphragm which acts as a mechanical transformer is capped on the top of actuators, and it vibrates perpendicular to diaphragm surface when driven by actuators. So the diaphragm functions as an acoustic radiation source. The transducer can generate more than 80 dB sound pressure in the frequency range of 200 Hz to 800 Hz, which is sufficient for low frequency active noise control.
机译：研究了具有大行程和低生成力的压电陶瓷执行器，以构建用于低频主动噪声控制的新型空气声换能器。悬臂压电双压电晶片，单压电晶片和RAINBOW执行器的机电性能均在理论上进行了实验研究。在所有弯曲执行器中，Bimorph具有最佳的机电性能。通过在单压电晶片和RAINBOW致动器中选择合适的钝化层和压电层的厚度比，可以获得最大的尖端挠度，阻塞力和机电耦合系数。在RAINBOW执行器的高温还原过程中，控制层是陶瓷层中的氧扩散，并且在975°C至1085°C的温度下，还原厚度与反应时间之间遵循抛物线规律。美元} C。开发了一种共振方法来确定RAINBOW执行器缩小层的杨氏模量，该方法可用于RAINBOW执行器的进一步优化设计。非线性压电和弹性响应对执行器性能有很大贡献。开发了两种新型压电致动器，即悬臂剪切模式致动器和多层伪剪切模式致动器。在剪切模式致动器中，由于其机械边界条件，电场会引起大的弯曲挠度。多层伪剪切致动器直接利用压电横向d {dollar} sb {lcub} 31 {rcub} {dollar}模式，在这种模式下，将一堆预极化的矩形PZT陶瓷片在交替的两端粘合在一起，从而使顶层的位移是随后所有层的总和，因此可以实现大位移。伪剪切执行器显示出比弯曲执行器更大的生成力。开发了一种具有挠曲位移放大机构的新型空气声换能器面板，其中压电致动器用作驱动元件。用作机械变压器的弯曲隔膜盖在执行器的顶部，当由执行器驱动时，它垂直于隔膜表面振动。因此，膜片起声辐射源的作用。换能器可以在200 Hz至800 Hz的频率范围内产生80 dB以上的声压，足以进行低频有源噪声控制。

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  • 作者

    Wang, Qing-Ming.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Engineering Materials Science.; Applied Mechanics.; Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1998
  • 页码 237 p.
  • 总页数 237
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;应用力学;机械、仪表工业;
  • 关键词

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