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Fatigue damage control of structures using surface mounted piezoceramic actuators.

机译：使用表面安装的压电陶瓷作动器控制结构的疲劳损伤。

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摘要

Durability and reliability are important objectives in the design of mechanical structures for vibration environments. Traditionally, these objectives have been achieved using passive design strategies involving the modification of design geometry, the use of stronger materials, and viscoelastic damping materials. Recent advances in piezoceramic materials and structural control theory suggest the use of an additional design tool for the pursuit of durable structures; active stress and damage control. That is, actuators and sensors may be distributed on a structure in such a way that control is exercised over the state of stress, strain, and the accumulation of structural damage.;In this research, an investigation into fatigue control of beam structures using surface mounted piezoceramics is performed, consisting of both modeling and hardware testing. Both classical and finite element dynamic modeling techniques are applied to generate modal based closed loop state space models. A test bed is designed and built for life testing active beams. Control system hardware and performance measurement techniques are developed. Vibration damage suppression is demonstrated in a design employing an active beam with modal rate feedback control and lead zirconate titanate (PZT) actuators. The life of this design example is extended by two orders of magnitude in resonant dwell testing.;A thermally based pre-stress procedure is presented for enhancing the durability of PZT actuators. In this process, actuators are placed in a compressive stress state by elevated temperature bonding to materials with higher coefficients of thermal expansion. Subtle negative effects of pre-stress on actuation strength are observed and measured.;Actuator mount fatigue is evident in the life test data, suggesting the presence of electrical and mechanical fatigue effects in PZT. The results show that piezoceramics may be limited but viable fatigue control actuators in some applications.
机译：耐久性和可靠性是振动环境机械结构设计中的重要目标。传统上，这些目标是通过使用被动设计策略来实现的，其中包括修改设计几何形状，使用更坚固的材料以及粘弹性阻尼材料。压电陶瓷材料和结构控制理论的最新进展表明，为了追求耐用的结构，需要使用一种额外的设计工具。主动控制压力和破坏。即，致动器和传感器可以通过对应力，应变和结构损伤的累积状态进行控制的方式分布在结构上；在本研究中，对使用表面的梁结构的疲劳控制进行了研究。执行安装的压电陶瓷，包括建模和硬件测试。经典和有限元动态建模技术都被应用于生成基于模态的闭环状态空间模型。设计并建造了一个测试台，用于对有源光束进行寿命测试。开发了控制系统硬件和性能测量技术。在一个采用模态速率反馈控制的主动梁和锆钛酸铅（PZT）致动器的设计中，证明了振动损伤的抑制。该设计实例的寿命在谐振驻留测试中延长了两个数量级。提出了基于热的预应力程序，以提高PZT执行器的耐用性。在此过程中，通过高温粘结到具有较高热膨胀系数的材料上，致动器处于压缩应力状态。观察并测量了预应力对驱动强度的细微负面影响。；在寿命测试数据中明显显示了执行器安装疲劳，表明PZT中存在电气和机械疲劳影响。结果表明，在某些应用中，压电陶瓷可能是受限制的但可行的疲劳控制执行器。

著录项

  • 作者

    Hull, Charles Anderson.;

  • 作者单位

    Rensselaer Polytechnic Institute.;

  • 授予单位 Rensselaer Polytechnic Institute.;
  • 学科 Applied Mechanics.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 235 p.
  • 总页数 235
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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