Dr. Xingang Li Profile

Dr. Xingang Li

at Harbin Engineering Univ

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Proceedings Article | 8 October 2010 Paper

The research of diagnose for structural damage based on piezoelectric phased array

Xingang Li, Zeyong Chen, Kang Yang, Zhenqing Wang, Limin Zhou

Proceedings Volume 7659, 765904 (2010) https://doi.org/10.1117/12.867948

KEYWORDS: Sensors, Aluminum, Phased arrays, Defect detection, Actuators, Structural health monitoring, Nondestructive evaluation, Ultrasonics, Signal detection, Diagnostics

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In this article, finite element simulation about the buried defect is used to simulate the process of detecting buried defects. We built a model similar to the reality. By using two integrated piezoelectric sensors attached to the surface of the structure, elastic waves can be injected into the matrix structure and the sensors can also receive the echo signal. By comparing the received echo signal of the defect structure and of an intact structure, the purpose of recognizing the existence of defects was achieved by extracting the signal reflection caused by the defective components. A comprehensive research based on piezoelectric actuators / sensors phased array for nondestructive testing simulating system was done. Its aim is to build a similar model to the actual situation, and to simulate the actual situations with the same measures to achieve the purpose of identifying the existence of defects. By building a set of active point-to-point scanning system, we detect the damage of aluminum structure by the use of piezoelectric ultrasonic transducer device, which plays the role of actuators and sensors. In addition, an experiment based on the detection of buried defects was carried out. The Ultrasonic flaw detector produces high-frequency and high-voltage pulse signals and it stimulates the actuators to transmit the elastic waves into the block structure. The sensors receive the echo signals, and deal with the echo signals based on continuous wavelet transform, and then study the distribution of time domain and frequency domain. By comparing echo signal, the purpose of identifying the existence of defects is achieved by extracting the echo signal caused by the defective components.

Proceedings Article | 21 October 2009 Paper

Point-by-point scanning piezoelectric phased array for detecting damage for SHM

Xingang Li, Zhenqing Wang

Proceedings Volume 7493, 74930D (2009) https://doi.org/10.1117/12.840209

KEYWORDS: Phased arrays, Sensors, Signal detection, Structural health monitoring, Actuators, Signal processing, Received signal strength, Control systems, Detector arrays, Transducers

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The aim of the present work is to develop a system of smart devices that could be permanently attached on the surface of the structure for monitoring cracks in most aerospace structures in isolated environments. It is shown that temporal and spatial focusing can be achieved through synthetic time-reversal array method for a linear phase array of sensors and actuators. Numerical simulation verifies the convergence of piezoelectric phased array. Near-field and far-field radiation pattern are also investigated to get the ultrasound field convergence plot. The scanning precision can be adjusted by changing the size of the focus patch. A Piezoelectric phased array system performs a point-by-point scanning in which focusing allows the inspection of large areas. Damage to the structure can be inferred if there is a significant change in the transient response of the structure using the analysis of the amplitude of the received signal. The location of this damaged area can be determined using the analysis of the time it reaches the transducer. By the method of synthesis of received signal time delay from multiple sensors, we can considerably enhance the signal strength, thus reducing the negative effects of noises to solve the tough problem of processing the echo signal. The results suggest accuracy better than 1 mm in finding the location of crack tips.

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