基于压电响应的螺栓松动监测方法
发布时间：2024-01-15 20:09
在过去的十年中,智能材料(例如压压材料(PZT))的使用为结构健康动动提供了新的可能性,并加速了结构识别和结构健康动动(SHM)的发展。使用自感应压压阻抗传感器的机压阻抗(EMI)技术取得了长足的进步。该技术使用PZT贴片,贴到要动视的结构中,提取机压阻抗信息用于损伤检动。本文主要研究使用压压传感器实时动动螺栓连接的松动。压压换能器和主体结构之间的机压耦合效应对局部损伤的敏感性被用于基于机压(EM)阻抗的损伤检动技术。然而,当这种技术应用于大型结构,存在阻抗失配的问题,这是由于主体结构的阻抗与PZT相比变得过大。为了解决这个问题,最近的研究人员开发了双PZT配置。本文采用双重PZT阻抗动量技术用于动视螺栓松动,螺栓松动由两个独立的锆钛酸铅(PZT)陶瓷片组成。本论文概述了机压阻抗技术的背景理论,及其在螺栓连接的健康动动中的实现。重点研究了智能材料与螺栓连接系统相结合的简化的机压阻抗(EM)的一维模型,获得螺栓预紧下的EM阻抗的特性。并通过有限元建模,研究了双PZT动动下的螺栓松动问题。通过对螺栓预紧条件下施加不同的动态载荷(振动)进行模拟,从粘结在螺栓接头上的PZT(锆钛酸铅)贴片的信...
【文章页数】：75 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
Chapter1 Introduction
1.1 Research Background
1.2 Problem Statement
1.3 Research Objectives
1.4 Organization of thesis
1.5 Literature Review
1.5.1 Bolted Joint
1.5.2 Bolted joints clamping force
1.5.3 Bolted joints preload
1.6 Bolted joints self loosening
1.6.1 Vibration on a bolted joint
1.6.2 Mechanism of self loosening of a bolted joint
1.6.3 The factors influencing self loosening of a bolted joint
1.7 Structural Health Monitoring Techniques
1.7.1 Visual inspection method
1.7.2 Low frequency vibration techniques
1.7.3 Static response-based techniques
1.7.4 Localized NDE techniques
1.7.5 Smart system based techniques
1.8 Summary
Chapter2 Electromechanical Impedance Method
2.1 Introduction
2.2 Theoretical Model of the EMI Technique
2.2.1 1D Electromechanical impedance model
2.3 Statistical Index
2.4 Advantages and Limitations of EMI Technique
2.5 Limitations of the EMI Technique
2.6 Piezoelectric Material
2.6.1 Brief History of piezo-ceramic transducers
2.6.2 Properties of piezo-ceramic materials
2.7 Method of Application
2.8 Selection of Frequency Range
2.9 Summary
Chapter3 Finite Element Analysis of Single Bolt Joint
3.1 FE modeling
3.1.1 Bolted joint Model definition
3.1.2 Geometry and meshing
3.1.3 Contact
3.1.4 Boundary condition
3.1.5 Modeling of PZT actuator and sensor
3.2 Analysis of Bolted joint loosening on single bolt joint
3.2.1 Transient analysis
3.3 Bolt Loosening detection using PZT impedance signatures
3.3.1 Harmonic Analysis
3.4 Damage detection capability of the Piezo-voltage signal
3.5 Bolt loosening quantification
3.6 Summary
Chapter4 Steel Beam-Column Connection FEM Analyzes
4.1 Bolted joint Model definition
4.2 Transient analysis
4.3 Harmonic analysis
4.4 Statistical Index
4.5 Frequency effect
4.6 Temperature effect on impedance response
4.7 Summary
Chapter5 Conclusion
5.1 Conclusion in English
5.2 Conclusion in Chinese
5.3 Future Works
References
Acknowledgement
本文编号：3878771
【文章页数】：75 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
Chapter1 Introduction
1.1 Research Background
1.2 Problem Statement
1.3 Research Objectives
1.4 Organization of thesis
1.5 Literature Review
1.5.1 Bolted Joint
1.5.2 Bolted joints clamping force
1.5.3 Bolted joints preload
1.6 Bolted joints self loosening
1.6.1 Vibration on a bolted joint
1.6.2 Mechanism of self loosening of a bolted joint
1.6.3 The factors influencing self loosening of a bolted joint
1.7 Structural Health Monitoring Techniques
1.7.1 Visual inspection method
1.7.2 Low frequency vibration techniques
1.7.3 Static response-based techniques
1.7.4 Localized NDE techniques
1.7.5 Smart system based techniques
1.8 Summary
Chapter2 Electromechanical Impedance Method
2.1 Introduction
2.2 Theoretical Model of the EMI Technique
2.2.1 1D Electromechanical impedance model
2.3 Statistical Index
2.4 Advantages and Limitations of EMI Technique
2.5 Limitations of the EMI Technique
2.6 Piezoelectric Material
2.6.1 Brief History of piezo-ceramic transducers
2.6.2 Properties of piezo-ceramic materials
2.7 Method of Application
2.8 Selection of Frequency Range
2.9 Summary
Chapter3 Finite Element Analysis of Single Bolt Joint
3.1 FE modeling
3.1.1 Bolted joint Model definition
3.1.2 Geometry and meshing
3.1.3 Contact
3.1.4 Boundary condition
3.1.5 Modeling of PZT actuator and sensor
3.2 Analysis of Bolted joint loosening on single bolt joint
3.2.1 Transient analysis
3.3 Bolt Loosening detection using PZT impedance signatures
3.3.1 Harmonic Analysis
3.4 Damage detection capability of the Piezo-voltage signal
3.5 Bolt loosening quantification
3.6 Summary
Chapter4 Steel Beam-Column Connection FEM Analyzes
4.1 Bolted joint Model definition
4.2 Transient analysis
4.3 Harmonic analysis
4.4 Statistical Index
4.5 Frequency effect
4.6 Temperature effect on impedance response
4.7 Summary
Chapter5 Conclusion
5.1 Conclusion in English
5.2 Conclusion in Chinese
5.3 Future Works
References
Acknowledgement
本文编号：3878771
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