英语论文网

ves that the Lamb wave is an effective method for the SHM of pre-stressed engineering structure and the aluminiumalloystructure is synchronously a good candidate for methods of Lamb wave. The thesis will also provide some suggestions about the SHMS for the further research.
Key Words: SHM; elastic stress;pre-stressed engineering structure;Lamb wave; aluminium

Acknowledgements

Upon the completion of this thesis, I would like to show my great appreciation to all the people who have provided me with assistance in the process of my thesis writing.
First of all, I want to extend my gratitude to Professor XXX, who gave me valuable guidance and constructive instructions with great patience. I have benefited a lot from his inspiring suggestions and invaluable critical comments on every draft of my thesis. Despite busy schedules, he always showed great patience in listening to my ideas and then gave many substantial invaluable comments. Without his constructive advice, constant encouragement and great patience, I could not have finished this thesis on time.
My appreciation also goes to Professor XXX and Professor XXX, for their inspiration and thought-evoking explanation. They have ushered me into the brilliant hall of literature, illumined by vivid description and profundity of knowledge.
I am also indebted to my bosom friend XXX, who not only elaborates on his thinking but also tides me over the tough moments. I am also grateful to those who offered me generous help and suggestions, and have encouraged me in my study and throughout my paper writing. Thanks also go to the authors whose studies I have cited and quoted in my thesis.
Last but not least, I would like to extend my heartfelt thanks to my beloved parents, whose love, encouragement and advice are what I cherish most in my whole life.

Table of Content

Abstract ii
Acknowledgements iv
Table of Content v
Lists of symbols and abbreviations vii
1. Introduction 1
1.1 General Background 1
1.2 Aims and Significances of the Research 2
1.3 Research Method 3
1.4 Structure of the Thesis 4
2. Literature Review 4
2.1 SHM Technology and Its Development 4
2.2 The Pre-stressed Engineering Structure 8
2.3 Piezoelectricity 10
2.3.1Piezoelectric Actuator 14
2.3.2Piezoelectric Sensor 16
2.3.3 Piezoelectric Transduce 17
2.4 Elastic wave 18
2.4.1 Different Elastic Waves 19
2.4.2 Mathematical formulation 22
2.4.3 Elastic Wave Propagate in Different Structures 36
2.4.3.1 Elastic wave propagation in beam structure 36
2.4.3.2 Elastic wave propagation in plate structure 39
2.4.3.2.1 Elastic wave propagation in void plate 39
2.4.3.2.2 Elastic wave propagation in crack plate 40
2.4.3.2.3 Elastic wave propagation in curved plates 43
3. Experiment and Research 45
3.1 A Brief Introduction of the Experiment 45
3.2 Material Properties 46
3.3 Creating Damage to Model in Prestressed Structure 47
3.3.1 Designing the Model Structure 47
3.3.2 Driving Frequency Selection 49
3.3.3 Designing the Edge Length of Elements 50
3.3.4 Selecting Time Step 本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。