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Traveltime tomography and prestack depth migration for vertical seismic profiling of an angle-domain walkaway on a complex surface

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Applied Geophysics 2019年第3期16卷 358-366,397页

作者： Li Jian-Guo Cui Xiao-Jie Huang Jian-Hua Zhang Xiao-Lu Li Yan-Peng New Resources Geophysical Exploration Division BGP Inc.CNPCZhuozhou072751China

Walkaway VSP cannot obtain accurate velocity field,as it asymmetrically reflects ray path and provides uneven coverage to underground target,thereby presenting issues related to imaging *** this study,we propose combining traveltime tomography and prestack depth migration for VSP of an angle-domain walkaway,in a bid to establish accurate two-dimensional and three-dimensional(3 D)velocity ***,residual curvature was defined to update velocity,and an accurate velocity field was *** establish a high-precision velocity model,we deduced the relationship between the residual depth and traveltime of common imaging gathers(CIGs)in walkaway *** renewal velocity using the least squares method,a four-parameter tomographic inversion equation was derived comprising formation dip angle,incidence angle,residual depth,and sensitivity *** the angle domain,the reflected wave was divided into up-and down-transmitted waves and their traveltimes were *** systematic cumulative method was employed in prestack depth migration of a complex *** prestack depth migration,the offset-domain CIGs were obtained,and dip angle was established by defining the stack section ***–Kutta ray tracing was employed to calculate the ray path from the reflection point to the detection point,to determine the incident angle,and to subsequently calculate the ray path from the reflection point to the irregular *** offset-domain residual depths were mapped to the angle domain,and a new tomographic equation was established and *** in the double complex area of the Tarim Basin showed the four-parameter tomographic inversion equation derived in this paper to be both correct and practical and that the migration algorithm was able to adapt to the complex surface.

关键词： complex surface angle domain travel time tomography VSP one-way wave prestack depth migration

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Prestack Gaussian beam depth migration under complex surface conditions

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Applied Geophysics 2010年第2期7卷 143-148,194页

作者：岳玉波李振春张平周学锋秦宁中国石油大学(华东)地球资源与信息学院青岛266555 中国石油勘探开发研究院西北分院兰州730020

In areas with a complex surface,the acquisition and processing of seismic data is a great *** elevation-static corrections can be used to eliminate the influences of topography,the distortions of seismic wavefields caused by simple vertical time shifts still greatly degrade the quality of the migrated ***-based migration methods which can extrapolate and image the wavefields directly from the rugged topography are efficient ways to solve the problems mentioned *** this paper,we carry out a study of prestack Gaussian beam depth migration under complex surface *** modify the slant stack formula in order to contain the information of surface elevations and get an improved method with more accuracy by compositing local plane-wave components directly from the complex ***,we introduce the basic rules and computational procedures of conventional Gaussian beam ***,we give the original method of Gaussian beam migration under complex surface conditions and an improved method in this ***,we validate the effectiveness of the improved method with trials of model and real data.

关键词： complex surface local plane-wave Gaussian beam migration

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RESAERCH OF MEASUREMENT THEORY FOR complex surface BASED ON ANNULAR ROLLER PROBE

RESAERCH OF MEASUREMENT THEORY FOR COMPLEX SURFACE BASED ON ...

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2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： CHEN Xin, JIN Junjie, WANG Ke, LIU Xin Shenyang University of Technology , Shenyang 110023 , China

In the course of measurement, there are some shortages of sphere probe contact measurement and laser non-contact measurement. With a sphere probe, the speed and efficiency are too low, while for a las

关键词： Annular roller probe Measurement complex surface Reverse engineering.

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Research on Ultrasonic NDT System for complex surface Parts

Research on Ultrasonic NDT System for Complex Surface Parts

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第十届国际制造工程与管理会议

作者： MA Hong-wei ZHANG Xu-hui WEI Juan(Department of Mechanical Engineering Xi’an University of Science and Technology Xi’an 710054 China)

＜正＞ Aimed at inner quality controlling for complex surface parts, an ultrasonic testing system for complex surface parts has been developed using ultrasonic NDT（Non-destructive Testing） which has features of strong penetration, well direction, high sensitivity, low cost, and harmless to people and material. The technologies of the computer, NC （Numerical control）, precision mechanism, signal analysis and processing were integrated in the testing system. The system includes a PC, system software, ultrasonic data acquisition card, stepper motor drive card and five-axis precision mechanical device, etc. The software was developed using WIN98-based VC++. According to CAD data of the parts and interpolation methods, the scanning programs can be programmed. The five-axis scanning system is driven by the CNC （computer numerical control） system to control the attitude of ultrasonic probes. The system’s automatic scanning for complex surface parts, real-time acquiring ultrasonic data and automatic identifying flaw signal have been realized. This system can be used not only for testing complex surface parts, but for testing random curve parts. With fast testing speed, high sensitivity, high testing precision and high reliability, the system has a wide adaptability.

关键词： complex surface ultrasonic non-destructive testing system

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Research on Ultrasonic NDT System for complex surface Parts

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厦门大学学报（自然科学版） 2002年第S1期41卷 12-页

作者： MA Hong-wei, ZHANG Xu-hui, WEI Juan (Department of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

Aimed at inner quality controlling for complex surface parts, an ultrasonic testing system for complex surface parts has been developed using ultrasonic NDT(Non-destructive Testing)which has features of strong penetration, well direction, high sensitivity, low cost, and harmless to people and material. The technologies of the computer, NC (Numerical control), precision mechanism, signal analysis and processing were integrated in the testing system. The system includes a PC, system software, ultrasonic data acquisition card, stepper motor drive card and five-axis precision mechanical device, etc. The software was developed using WIN98-based VC++. According to CAD data of the parts and interpolation methods, the scanning programs can be programmed. The five-axis scanning system is driven by the CNC(computer numerical control) system to control the attitude of ultrasonic probes. The system’s automatic scanning for complex surface parts, real-time acquiring ultrasonic data and automatic identifying flaw signal have been realized. This system can be used not only for testing complex surface parts, but for testing random curve parts. With fast testing speed, high sensitivity, high testing precision and high reliability, the system has a wide adaptability.

关键词： complex surface ultrasonic non-destructive testing system

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Research on ultrasonic detection of complex surfaces

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第10期6卷 1146-1151页

作者：江健周晓军郭天太吴思源 Department of Mechanical Engineering Zhejiang University Hangzhou 310027 China

Parts of complex surface are widely used now in many fields, and their detection has caused much concern. In China many manufactories still carry on the traditional way of manual detection, which requires highly skilled personnel and efficiency is low. Some large manufactories have imported auto-detecting equipments, which require CAD data on the parts, or just divide the surface into several approximate planes for automatic detection. Phased-array system is seldom used, and the cost is high. Besides, most of the systems have not considered the automatic sensitivity compensation of parts with varying thickness. To improve the detection quality and efficiency of nondestructive test (NDT) of parts of complex surface, this paper puts forward an integrated ultrasonic NDT system characterized by: (1) Use of ultrasonic measurement and reverse of curved surface to solve the CAD data problem; (2) Use of an automatic sensitivity compensation algorithm (based on the part’s modelling information obtained in surface reverse) to fit the variety of the thickness; (3) Use of template matching and pseudo-color imaging to improve the quality of detection results. The system features integration of low cost mature technologies, and is suitable for detection of various parts of different complex surfaces in medium-and-small enterprises. The test results showed that the system can automatically detect parts of complex surface successfully, and that the inspection result is good and reliable.

关键词： Ultrasonic NDT complex surface Automatic sensitivity compensation Ultrasonic measurement surface reverse Template matching Pseudo-color imaging

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Research and Application of the Space Digital Model about the surface of the complex Parts

Research and Application of the Space Digital Model about th...

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第四届国际机械工程与力学会议

作者： Xiaohua HUANG Juan CAO Jiancheng XU Chunsong WANG Jinsong YIN The institute of the mechanical engineering Nanjing University of science and technology The Engineering Training Center Nanjing University of science and technology The institute of Taizhou Nanjing University of science and technology

In the process of the CNC profiling, there exists some problem, such as processing interference, undercutting and the profiled processing precision. These problems are seriously affected the technology of Profiling used in the surface processing of the complex components. It is very necessary to research the digital model of the surface of the complex parts. On the basis of the data acquisition of profiling and the vector characteristics, the normal vector and tangential vector of the differential points on the surface of parts are got, and we get the space digital model of the surface of those parts. At last, we do some processing experiment using the method, and all those above question are resolved successfully.

关键词： Profiling process Vector Geometry complex surface Digital Model

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Simulation of multi-axis grinding considering runout based on envelope theory

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Chinese Journal of Aeronautics 2020年第12期33卷 3526-3534页

作者： Yan JIANG Qiang GUO School of Mechanical&Power Engineering Henan Polytechnic UniversityJiaozuo 454150China

As one of the most important methods for machining process with high accuracy,ultra-precision grinding is widely used in fields such as aerospace,automotive and mold,***,it is common that wheel and spindle axis do not coincide with each other due to wheel settings,machining errors and so *** could result in the generation of wheel runout,which may reduce the machining surface's *** this paper,combining this phenomenon,an analytic algorithm method for the multi-axis grinding process is introduced according to the envelope *** that,the accuracy of this method is *** experiments are carried out on a 5-axis machining *** artificial runout is set up and calculated utilizing the least square ***,using the presented method,two examples with and without runout are introduced to illustrate the validation of the proposed *** error due to the runout effect is also analyzed.

关键词： Analytic algorithm complex surface Envelope theory Multi-axis grinding Wheel runout

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Investigation of the application of a magnetic abrasive finishing process using an alternating magnetic field for finishing micro-grooves

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Nanotechnology and Precision Engineering 2021年第3期4卷 12-19页

作者： Huijun Xie Yanhua Zou Graduate School of Engineering Utsunomiya University7-1-2YotoUtsunomiyaTochigi 321-8585Japan

A magnetic abrasive finishing process using an alternating magnetic field is proposed for the finishing of complex *** an alternating field,the periodic changes in current will cause the magnetic cluster used as a magnetic brush to fluctuate,which will not only continuously replace the abrasive particles in contact with the workpiece,but also periodically adjust the shape of the magnetic cluster to better fit the surface of the *** this paper,the influence of a combination of alternating and static magnetic fields on the magnetic field in the finishing area is *** feasibility of this process for finishing micro-grooves is *** and experimental measurements show that the combination of alternating and static magnetic fields can retain the advantages of the alternating field while increasing the magnetic flux density in the finishing *** experimental results show that the process is feasible for finishing micro-grooves,with an excellent deburring effect on the groove edges.

关键词： Alternating magnetic field complex surface Deburring Magnetic abrasive finishing Micro-groove

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Multi-hole joint acquisition of a 3D-RVSP in a karst area:Case study in the Wulunshan Coal Field,China

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Applied Geophysics 2020年第1期17卷 37-53,167,168页

作者： Hu Ming-Shun Pan Dong-Ming Zhou Fu-Bao Li Juan-Juan Wang Yang-Zhou Chen Shen-En Xu Yong-Zhong School of Resource and Geosciences China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Gas and Fire Control for Coal Mines CUMTXuzhou 221116China IoT Perception Mine Research Center China University of Mining&TechnologyXuzhou 221116China Institute of Applied Geophysics Yankuang Group Company limitedZoucheng 273500China Department of Civil and Environmental Engineering University of North Carolina at CharlotteCharlotte 28223USA

Conventional surface seismic exploration in areas with complex surfaces such as karst landforms has been faced with the problem of poor excitation and reception ***(reverse vertical seismic profile)seismic exploration adopts a geometry in which the sources are downhole and receivers are on the ground which can reduce the influence of complex surfaces on seismic wave propagation(to some extent).Through numerical simulations and real data analysis,it was noted that in areas with complex surfaces and large numbers of underground karst caves,seismic waves generated in shallow boreholes are easily affected by various surface and multiple waves as well as by scattering from karst ***,the quality of the reflected seismic data is extremely ***,it is difficult to improve the signal to noise ratio(SNR)with conventional noise filtering ***,when the source depth is increased,the quality of the reflected waves can be *** is exactly what the RVSP method ***,for the RVSP method,due to its particular geometry,the apparent velocities of the reflected waves and most interference waves are quite different,which can help to filter most noise to further improve the SNR of the reflected *** this study,a 3 D-RVSP exploration study using 8-hole joint acquisition was conducted in a typical karst *** results show that the 3 D-RVSP method can obtain higher quality seismic data for complex surface conditions that have large numbers of underground karst ***,multi-hole joint acquisition for 3 D-RVSP has higher data collection efficiency and better uniformity of underground ***,in this study,38 faults were accurately revealed and at high resolution based on the 3 D-RVSP imaging results.

关键词： Karst complex surface Seismic response 3D-RVSP Multi-hole joint acquisition

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