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Innovative application of smart piezoelectric material to vibration control and health monitoring.

机译：智能压电材料在振动控制和健康监测中的创新应用。

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摘要

This dissertation presents the study of vibration control of flexible beam structure and health monitoring of concrete structures using piezoceramic materials. Flexible beam structure is commonly used in many fields of engineering such as aerospace engineering. The vibration control problem is investigated and studied on a flexible pultruded fiber-reinforced polymer (FRP) I-beam and a flexible aluminum beam. A batch least square (BLS) positive position feedback (PPF) controller is proposed for the vibration control of the pultruded FRP I-beam structure. A smooth robust adaptive sliding-mode controller is proposed for the vibration control of the flexible beam structure with model uncertainty. The experimental results have verified the effectiveness of the proposed controllers. Concrete structures are the most popular civil structures. Throughout the life cycle of a concrete structure, many important issues have to be addressed properly to ensure the safe operation of these structures. This dissertation presents an innovative piezoceramic-based smart aggregate (SA), that can perform three major tasks: early-age concrete strength monitoring, impact detection, and structural health monitoring. The proposed SAs are embedded at desired locations before the casting of the concrete structure. The concrete strength development is monitored by observing the high frequency harmonic wave response of the SAs. Impact detection is realized by observing the open-circuit voltage of the piezoceramic patch in a smart aggregate. For structural health monitoring purposes, a smart aggregate-based active sensing system is designed for the concrete structure. A damage index based on the wavelet packet analysis is used to determine the structural damage status. To better reveal the damage time-history and location information, two types of damage index matrices are proposed: a time-history damage index matrix and an actuator-sensor damage index matrix. To demonstrate the multi-functionality of the proposed smart aggregates, different types of concrete structures have been used as test objects, including concrete bridge bent caps, concrete cylinders, and a concrete frame. Experimental results have verified the effectiveness and the multi-functionality of the proposed SAs. The multi-functional smart aggregate has the potential to be applied in the comprehensive monitoring of concrete structures from its early stages through its life-time.
机译：本文对压电陶瓷材料柔性梁结构的振动控制和混凝土结构的健康监测进行了研究。挠性梁结构通常用于许多工程领域，例如航空航天工程。研究了柔性拉挤纤维增强工字梁和柔性铝梁的振动控制问题。提出了一种批最小二乘（BLS）正位置反馈（PPF）控制器，用于拉挤玻璃钢工字梁结构的振动控制。提出了一种具有模型不确定性的光滑鲁棒自适应滑模控制器，用于柔性梁结构的振动控制。实验结果证明了所提出控制器的有效性。混凝土结构是最受欢迎的土木结构。在混凝土结构的整个生命周期中，必须正确解决许多重要问题，以确保这些结构的安全运行。本文提出了一种创新的基于压电陶瓷的智能骨料（SA），它可以执行三个主要任务：早期混凝土强度监测，冲击检测和结构健康监测。拟议的SA在混凝土结构浇筑之前已嵌入所需的位置。通过观察SA的高频谐波响应来监视混凝土强度的发展。通过观察智能骨料中压电陶瓷贴片的开路电压来实现影响检测。为了进行结构健康监测，针对混凝土结构设计了基于智能骨料的主动传感系统。基于小波包分析的损伤指数用于确定结构损伤状态。为了更好地揭示损伤的时间历史和位置信息，提出了两种类型的损伤指数矩阵：时间历史损伤指数矩阵和执行器-传感器损伤指数矩阵。为了证明所提出的智能骨料的多功能性，已将不同类型的混凝土结构用作测试对象，包括混凝土桥弯帽，混凝土圆柱体和混凝土框架。实验结果证明了所提出的SA的有效性和多功能性。多功能智能骨料具有从早期到生命周期全面应用于混凝土结构监测的潜力。

著录项

  • 作者

    Gu, Haichang.;

  • 作者单位

    University of Houston.;

  • 授予单位 University of Houston.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 203 p.
  • 总页数 203
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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