Tension Force Estimation in Cable Structure using Impedance-based Method
- Alternative Title
- 임피던스 기법을 이용한 케이블 구조의 긴장력 추정
- Abstract
- In this study, an impedance-based tension force estimation method is developed for structural health monitoring (SHM) of axially loaded members. To achieve the objective, the following approaches are implemented. Firstly, theories of the impedance-based axial force estimation method are outlined. Secondly, a prototype of PZT interface attached to the cable structure is designed to monitor the axial force. A PZT interface technique is developed for predetermining effective sensing frequency ranges of electro-mechanical impedance responses. Thirdly, the feasibility of the proposed PZT interface technique is numerically evaluated for monitoring the tension force variation of the cable structure. Fourthly, the sensibility of impedance signatures via the PZT interface is numerically analyzed with respect to effective parameters such as the geometry of the interface and the size of PZT patch. Finally, the applicability of the proposed PZT interface is experimentally evaluated via estimating the axial force variation in a lab-scale cable structure.
본 연구에서는 케이블 구조와 같은 축 부재의 구조건전성 모니터링 (SHM)을 위한 임피던스 기반 긴장력 추정기법을 제시하였다. 먼저, 임피던스 기반 축력 추정기법의 원리를 요약하였다. 두번째로, 축력 모니터링을 위해 케이블 구조에 부착 가능한 PZT 인터페이스를 설계하였다. 또한 임피던스 모니터링에서 유효 센싱 주파수 범위를 미리 결정하기 위한 PZT 인터페이스 기술을 제시하였다. 세번째로, 케이블 구조의 축력 변화를 모니터링하기 위해 제안된 PZT 인터페이스 기법의 가능성을 수치 해석을 통해 평가하였다. 네번째로, 인터페이스의 기하학적 구조 및 PZT 센서의 크기와 같은 유효 파라미터에 대해 PZT 인터페이스의 임피던스 응답 민감도를 수치적으로 분석하였다. 마지막으로, 제안된 PZT 인터페이스의 적합성을 실험실 규모의 케이블 구조에서의 축력 변화를 추정함으로써 실험적으로 증명하였다.
- Issued Date
- 2018
- Awarded Date
- 2018. 8
- Type
- Dissertation
- Keyword
- Tension force monitoring Impedance-based Tension force estimation Electro-mechanical impedance PZT interface
- Publisher
- 부경대학교
- Alternative Author(s)
- Joo-Young Ryu
- Affiliation
- 부경대학교 대학원
- Department
- 대학원 해양공학과
- Advisor
- 김정태
- Table Of Contents
- CHAPTER 1 INTRODUCTION 1
1.1 Background 1
1.2 Objective and Scope 3
CHAPTER 2 IMPEDANCE-BASED AXIAL FORCE MONITORING METHOD 5
2.1 Introduction 5
2.2 PZT Interface-based Impedance Monitoring Technique 5
2.3 Force Estimation Method for Axially Loaded Members 9
2.3.1 Relationship between Axial Force Change and PZT Interface’s Frequencies 9
2.3.2 Axial Force Estimation using PZT Interface’s Impedance Signatures 12
CHAPTER 3 NUMERICAL EVALUATION FOR IMPEDANCE-BASED TENSION FORCE MONITORING OF CABLE STRUCTURE 14
3.1 Introduction 14
3.2 Prototype Design of PZT Interface 14
3.2.1 Geometric Design 14
3.2.2 Local Dynamic Characteristics 15
3.3 Numerical Impedance Measurement of Cable Structure via PZT Interface 19
3.3.1 Finite Element Modeling 19
3.3.2 Numerical Impedance Signatures 21
3.4 Tension Force Estimation for Cable Structure 24
3.4.1 Boundary Condition of PZT Interface 24
3.4.2 Estimated Tension Force in Cable Structure 26
CHAPTER 4 EFFECT OF PZT INTERFACE’S GEOMETRY ON TENSION FORCE ESTIMATION 28
4.1 Introduction 28
4.2 FE Modeling Scenarios 28
4.2.1 Scenario 1: Effect of PZT’s Size 29
4.2.2 Scenario 2: Effect of Interface’s Size 30
4.3 Effects of PZT’s Size on Tension Force Estimation 31
4.3.1 Effect of PZT Length 31
4.3.2 Effect of PZT Thickness 34
4.4 Effects of Interface’s Size on Tension Force Estimation 38
4.4.1 Effect of Interface Length 38
4.4.2 Effect of Interface Thickness 44
4.5 Discussions 48
CHAPTER 5 EXPERIMENTAL EVALUATION FOR IMPEDANCE-BASED TENSION FORCE MONITORING OF LAB SCALED CABLE STRUCTURE 49
5.1 Introduction 49
5.2 Numerical Analysis of Sensing Frequency Band 49
5.2.1 Design of PZT Interface Prototype 49
5.2.2 Pre-determining Sensing Frequency Band 50
5.3 Experiments on a Lab-scaled Cable Structure 52
5.3.1 Experimental Setup 52
5.3.2 Experimental Scenarios of Tension Force Change 54
5.4 Impedance-based Tension Force Estimation 54
5.4.1 Impedance Measurement for Cable Structure via PZT Interface 54
5.4.2 Tension Force Estimation for Cable Structure 57
5.4.3 Correlation between Real and Estimated Values 59
CHAPTER 6 CONCLUSIONS 61
REFERENCES 63
- Degree
- Master
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