Xiaorong Gao

Southwest Jiaotong University

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Zeyong Wang

Nanjing Medical University

Lin Luo

Chinese Academy of Sciences

Jinlong Li

Southwest University

Jianping Peng

Southwest Jiaotong University

Chaoyong Peng

Southwest Jiaotong University

Kai Yang

Southwest Jiaotong University

Quanke Zhao

Dalian University

Hongna Zhu

Southwest Jiaotong University

Jianqiang Guo

Second Hospital of Shandong University

Yu Zhang

Southwest Jiaotong University

Cooperative Institutions

Southwest Jiaotong University

169

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Wuhan University

Tsinghua University

University of Science and Technology of China

Shanghai Jiao Tong University

Chongqing University

Huazhong University of Science and Technology

Zhejiang University

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Wheel and axle defect detecting technique using phased array ultrasonic

Xiaorong Gao Jianping Peng Yu Zhang Chaoyong Peng You Sin Tan

The quality of wheel and axle is especially important for the safety of locomotive and vehicle. When the wheel running at high speed and high load, circumferential and radial cracks occurs on the stress concentration area of wheel rim, wheel disk, bore hole and gear seat, wheel seat, unload groove on axle because of the remnants remaining during the wheel manufacturing process. Phased array ultrasonic NDT technology and related equipment development applied widely in railway NDT area is introduced in this lecture. Based on phased array ultrasonic technology wheel-set NDT comprehensive technical system has been built for high speed train in China, which has a very important practical significant for the safety of train and people's lives.

Phased array ultrasonics

Groove (engineering)

10.1109/fendt.2013.6635525

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Citations (7)

Monitoring system of multiple fire fighting based on computer vision

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2010)

Jin‐Long Li Li Wang Xiaorong Gao Zeyong Wang Quanke Zhao

With the high demand of fire control in spacious buildings, computer vision is playing a more and more important role. This paper presents a new monitoring system of multiple fire fighting based on computer vision and color detection. This system can adjust to the fire position and then extinguish the fire by itself. In this paper, the system structure, working principle, fire orientation, hydrant's angle adjusting and system calibration are described in detail; also the design of relevant hardware and software is introduced. At the same time, the principle and process of color detection and image processing are given as well. The system runs well in the test, and it has high reliability, low cost, and easy nodeexpanding, which has a bright prospect of application and popularization.

Fire Detection

Machine Vision

10.1117/12.863260

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Two-Dimensional Mean Adaptive Zero-Crossing Factor Weighted Ultrasound Plane Wave Imaging

Journal of Nondestructive Evaluation (2022)

Yuanhao Tan Lin Luo Jinlong Li Yu Zhang Xiaorong Gao

Speckle noise

Zero crossing

10.1007/s10921-022-00863-4

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Citations (4)

Optimization Algorithm for Point Cloud Quality Enhancement Based on Statistical Filtering

Journal of Sensors (2021)

Qian Zhao Xiaorong Gao Jinlong Li Lin Luo

In the process of acquiring point cloud data by a 3D laser scanner, some problems, such as outliers, mixed points, and holes, may be caused in the target point cloud due to the external environment, the discreteness of the laser beam, and the occlusion of objects. In this paper, a point cloud quality optimization and enhancement algorithm is designed. A self‐adaptive octree is established to rasterize the point cloud and calculate the density of each grid, combing with the statistical filtering to remove outliers from the point cloud data. Then, a plane projection method is used for removing the confounding points from the point cloud data. Finally, the point cloud is triangulated and a priority value is set, and then, points are preferentially inserted where the priority value is the largest to repair the holes. Experiments show that while removing outliers and confounding points, the detailed features of the point cloud can be maintained, holes are effectively filled, and the quality of the point cloud is effectively improved.

10.1155/2021/7325600

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Citations (19)

Study on optimization of parameter selection in Fourier transform profilometry

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2009)

Peng Jin Li Wang Xiaorong Gao Zeyong Wang Quanke Zhao

For using grating projection principle 3D profile measurement, the key is to select the appropriate parameters, assurance system measurement precision and scope, and to ensure Fourier spectrum completely separated. This paper focuses on the use of the concept of equivalent wavelength; parameters selection and optimization in Fourier transform profilometry (FTP). The experiments shows that : Compression angle, raise projection grating spatial frequency can be avoided in the frequency domain of spectrum aliasing, and to ensure the accuracy of the measurement system. Through the angle and frequency parameters of selection and optimization, the best results are achieved.

Aliasing

10.1117/12.828687

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Citations (1)

DOAJ (DOAJ: Directory of Open Access Journals) (2022)

Xiaorong Gao Haowen Yan LU Xiaomin

Polygon (computer graphics)

Similarity (geometry)

Semantic space

10.11947/j.agcs.2022.20210074

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Citations (3)

Ultrasonic Signal Multiplex Technology for Dynamic Wheelset Defect Detection System

International Conference of Information Technology, Computer Engineering and Management Sciences (2011)

Chaoyong Peng Xiaorong Gao Li Wang Yu Zhang Jianping Peng

As one of the key components of railway transportation, the condition of railway wheel sets are essential, especially in heavy-load application. A method for dynamic wheel sets defect detection by applying ultrasonic testing technology is described in this paper. Totally 448 ultrasonic probes are needed and arranged alone the track. Ultrasonic signal multiplex technology is designed for time multiplexing of the ultrasonic electronic channels. With the help of this technology, only 5% quantity of ultrasonic electronic channels are needed comparing with using ultrasonic probe and ultrasonic electronic channel one by one. Due to the high-power transmitting and the sensitive receiving of ultrasonic signal, the signal in multiplexer electronic circuit should well shielded and switched. Multilayer electronic circuit board and reed relays are designed to keep the performance of ultrasonic signal. The dynamic wheel sets defect detection system has been applied in Wuhan depot, China and about 200 wheel sets are inspected each day.

SIGNAL (programming language)

10.1109/icm.2011.232

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Citations (5)

Method of ultrasonic phased array imaging based on segment amplitude apodization

Jianqiang Guo Lin Chen Yu Zhang Kai Yang Jinlong Li

Single amplitude apodization technology applied in ultrasound imaging system can obtain better imaging resolution only within a certain distance, outside of this range the resolution is significantly lower, while using segment dynamic apodization technique can make up for this shortfall. Therefore, we make an analysis and research on the basis of the beams about the 3 dB equivalent distribution with a variety of single amplitude apodization functions, and observe to come to the best imaging resolution range for each function, then calculate the dynamic weighting value by establishing a linear phased array sound field simulation model, thus find a way to achieve segment dynamic amplitude apodization, and draw the 3 dB contour and the distribution of sound field to prove the feasibility of this technique.

Apodization

Aperture (computer memory)

10.1109/fendt.2013.6635552

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Citations (5)

Defect Length Prediction of Aluminum Alloy Sheet by Using Differential Evolution-Support Vector Regression (DE-SVR)

Yan Wu Xiaorong Gao Hongna Zhu

Aluminum alloy sheet has been widely applied in transport manufacturing industry due to its good mechanical properties. However, aluminum alloy sheet can inevitably generate defects in the process of processing and forming. In this paper, through the Support Vector Regression (SVR) model optimized by Differential Evolution (DE) algorithm, the collected Lamb wave signal in aluminum alloy sheet is analyzed and processed to detect the defect length in aluminum alloy sheet. The error penalty parameter C and kernel function g of SVR can be optimized constantly by using the selection, crossover, mutation operators and greedy selection strategies of DE algorithm. The feature matrix of Lamb wave signal is extracted and introduced into Particle Swarm Optimization-Support Vector Regression (PSO-SVR), Genetic Algorithm-Support Vector Regression (GA-SVR) and DE-SVR to compare and analyze the defect length error evaluation indexes. The results show that DE-SVR can greatly improve the speed and accuracy of defect length prediction of aluminum alloy sheet.

Differential Evolution

10.1109/fendt50467.2020.9337552

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Researches on ultrasonic image revise for phased array ultrasonic test of train wheel

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2011)

Yu Zhang Li Wang Xiaorong Gao Jianping Peng Chaoyong Peng

Ultrasonic image formed by Phased Array Ultrasonic probes placed on wheel tread is deformed. Especially for ultrasonic image around area of wheel disk hole, because that area has a complex construction and a long ultrasonic path. According to probes layout and beam angle, correction algorithms are designed to revise deformed ultrasonic images. Tests on CRH reference wheels with manmade defects and tests on CRH wheels on train shows that the correction algorithms proposed can correct all types of CRH wheel's ultrasonic images, and the calibration can meet the requirement of field application.

Phased array ultrasonics

10.1117/12.898858

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Citations (1)