- Yiqiang Wang, PhD
Related Technology: Computerized Numerical Control (CNC), Advanced Manufacturing Technology (AMT), Intelligent Manufacturing Technology (IMT), CAD/CAM/CAPP, CIMS, CNC machine tools & systems; Dependability (reliability, maintainability & serviceability); Information Technology (IT) (SQL SERVER, ORACLE, JAVA, VISUAL C++, Internet, Hardware/Software Development).
Prof. Yiqiang Wang' Curriculum Vitae
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| Name: | Yiqiang Wang | Gender: | Male |
| Education: | PhD | Citizen: | China |
| Address: |
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| Mar. 1995--Feb. 1999: | PhD, Mechanical Engineering, Jilin University of Technology, Changchun, China |
| Aug. 1987--June 1990: | MSc, Mechanical Engineering, Jilin University of Technology, Changchun, China |
| Aug. 1983--June 1987: | BSc, Mechanical Engineering, Jilin University of Technology, Changchun, China |
Professional Experience:
Teaching Courses:
Prof. yiqiang Wang' Research Interests
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Research Interest: |
Mechatronics and Reliability . Life Cycle Design of CNC Machines |
Awards:
[HOMEPAGE] [RESUME] [RESEARCH] [PUBLICATION] [RECENT PROJECT] [SPECIAL SKILL] [NEWS LETTER ]
Prof. Yiqiang Wang' Sample Publication
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Publications:
M Yu, J Zhao, L Zhang and Y Wang, Study on the dynamic characteristics of a virtual-axis hybrid polishing machine tool by flexible multi-body, Proc. Instn mech. Engrs Vol. 218 Part B: J. Engineering manufacture: (2004)1067-1076
Yiqiang Wang, Richard Yam, Ming Zuo, A multi-criterion evaluation approach to selection of the best statistical distribution, Computers & Industrial Engineers, 47(2004) 165-180
Prof. Yiqiang Wang' Recent Projects
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Recent Projects in progress:
Newsletter
Prof. Yiqiang Wang' Special Skill
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Embedded System Development
Computerized control system with single-board, single-chip microcomputer or DSP (Intel 8086, MCS51/96 series or TMS320 series). Design of circuit drawing and printed circuit board, development of hardware and software & debugging.
The representatives in this field:
(1) Control System of The Material Test Machine
The system is comprised of the MCS51 (8031) single chip microcomputer system that controls the direction, speed and displacement of the machine driven by step-motor, following the requirement of the test.
(2) Parallel-To-Series Communication Transfer
The transfer is a mini apparatus comprised of MCS 8031 single chip microcomputer. Its function is to transfer the parallel communication to series communication (RS232C). It is applied mainly to the communication between computer and the instrument with only printer interface, it also can be used to the communication between computer and CNC machine tools.
(3) Experiment and Demonstration System of CNC Machine Tools
The system is comprised of 8086 single board microcomputer. It can be used to the experiment and demonstration for the CNC machine tools course, such as, the control of step motor, automatic acceleration and deceleration control of step motor, interpolation principle demonstration and so on.
(4) NC Tape Reader Simulator
The NC Tape Reader Simulator is a mini apparatus comprised of MCS 8031 single chip microcomputer. Its function is to simulate the NC tape reader to transfer NC program or machine data between CNC system and computer.
(5) Near Infrared Grain Ingredient Instrument
The system is comprised of 89C51 single chip microcomputer. It can be used to measure the ingredient of grains (corn, wheat, bean, paddy etc.), such as water, protein, oil, starch.
(6) Impulse Generator Multiplicator
The system is comprised of ARM 7 architecture chip, Philips 2130. It can be used to generate impulse by simulating Handy Impulse Generator and multiple its frequency by 100 times.
Computerized Numerical Control Technology
Computerized numerical control technology, such as the development of the control systems and their maintenance. Familiar with FANUC 0 T/M series CNC systems, AB 8200 series CNC systems, Siemens 810/840/880 series CNC systems, FAGOR 8025/8030/8050 series CNC systems. In addition, familiar with OMRON CH200 and MITSUBISHI FX series Programmable Logic Controller (PLC).
The representatives in this field:
(1) Control system of the coil-wiring machine
The machine is controlled with a FANUC 0TD CNC system. The tool path of X and Z axes are controlled by CNC system, and the air and hydraulic pressure, cycle of working process are all controlled automatically by the CNC system.
(2) Development of NC milling machine
The machine is controlled with a FAGOR 8025 CNC system with 3 simultaneous controlled axes.
(3) Embedded Open Modular CNC System for Polishing Machine (CCS, C++, real-time kernel)
The CNC system is used for a special polishing machine which has five axes and a high speed spindle. In the meantime, the polishing force must be control during machining. A self-made motion control card is based on embedded system (DSP) TI TMS320-2812 which can be mounted on a PC through PCI interface.
(4) Simulation Software for CNC Lathe (Visual C++, OPENGL, Supported by Singapore Company)
The software is developed with Visual C++, OpenGL, it is a part of CNC system developed by a Singapore company. It may simulate the machining process of CNC lathe. It may process directly the NC file which is composed of G-code and M-code.
Computer Software Development
Familiar with the insides of DOS/WINDOWS operating systems, such as MS DOS, MS WINDOW 9X/NT/2000/XP. Development of software with BASIC, FORTRAIN, C++, FoxPro, VISUAL C++, SQL Server, OpenGL and so on. Especially, good at developing real time control software by using C++, Visual C++, even Assembly Language. More than ten years experiences in developing hardware and software and Internet.
The representatives in this field:
(1) Control system of the Bowling equipment (VISUAL C++, PLC, Network)
The modules of the system include CCD vision identification, graphic information processing and the bottle identification; communications between single-lane controller and PLC which controls the machines to realize all kind of functions, such as bottle sweep-out, bottle rearrangement, ball return; score-keeping; single lane control and network management.
(2) Transmission of NC program between CNC machine tools and Computer (VISUAL C++, Assembly Language)
The system simulates the DNC machining while manufacturing a die or a very complicated workpiece in a machining center that need very large memory to store the NC program. It may automatically identify the ISO and EIA code, transmit NC program or machine parameters between CNC system and a personal computer.
(3) Automatic Programming Tool for Ultra-precision Optic CNC machining (Award of Sci & Tech. in Jilin Province) (TURBO C++)
The system is comprised of two modules, the preprocessing module and the post-processing module. The preprocessing module calculates and generates the cutter path data, and the post-processing module generates NC code for specific CNC machine. The system is developed for the MSG-325 Ultra-precision NC Diamond Tool Lathe technically, it is also suitable for other kind of CNC lathes.
(4) Reliability Analysis Software for CNC Machine Tools (Visual C++ 6.0)
It includes the loading spectra analysis, field failure analysis, reliability quota calculation, reliability allocation and design functions.
(5) Surface Texture Analysis Software for Ultra-precision machining (TURBO C++)
The software communicates with the TALYSURF surface measurement instrument via RS232C series interface or IEEE 488 parallel interface, and transmits surface data from TALYSURF or TALYSTEP to computer, calculates the roughness, waviness, surface error, FFT and statistic values.
(6) EMS (Electric Power Energy Management System) (Visual C++, SQL SERVER, OPENGL, HTML etc.)
The software integrates the Supervisory Control and Data Acquisition Systems (SCADA), Distribution Management Systems (DMS), Energy Management Systems (EMS), Dispatcher Training Simulator (DTS) and so on. Distribution Management Systems and Dispatcher Training Simulator are offered in the EMS suite. The EMS network model will generate telemetered data normally acquired from Remote Terminal Units (RTUs). The DTS uses exactly the same operating displays and applications that the operator will use in real-time operation. DTS will support multiple concurrent trainees.
(7) Digital AUTOCAD Secondary Development (Visual C++, ObjectARX 2000, AUTOCAD 2000)
The software is developed with Visual C++, ObjectARX 2000, it may run under AUTOCAD 2000 environment. It may process *.DXF & *.DWG format graphical files for drawing correction and modification through digital dimension-driving technology. It has also the function of exporting /importing DXF format drawing into EMS (Electric Power Energy Management System) file format.
(8) Real Time Monitoring on Tool cutter during CNC Machining (Visual C++)
The software samples cutting force signals, analyzes the signals in the frequency and time domain by employing wavelet analysis technology and neural network, and automatically judges the undercut or broken-out of tool.
(9) CAPP ---Computer Aided Process Planning (Visual C++, OpenGL, SQL Server)
The software is developed with Visual C++, OpenGL, SQL Server, it is composed of feature module, database management, decision-making module and so on.
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MSc Topic: Measurement and Analysis of Dynamic Behavior of Ultra-precision CNC Diamond Tool lathe.
Abstract:This thesis performs the comprehensive measurement and analysis of the dynamic behaviors of a MSG-325 Ultra-precision 2-AXIS CNC Diamond Tool Lathe manufactured by Rank Pneumo Inc. USA. Present state and perspectives of the diamond tool cutting technology and its machine tools is described first. Present state and perspectives of the dynamic behaviors analysis and parameter identification of machine tools is also described. The MSG-325 Ultra-precision 2-AXIS CNC Diamond Tool Lathe and its peripherals are introduced. Transient impulse exciting method and stable stochastic exciting method are devised to measure the dynamic behaviors of the lathe. The modal parameters of the CNC lathe is identified by means of the real modal analysis method and the complex modal analysis method
Keywords:
CNC Lathe, Diamond Tool, Ultra-precision Manufacturing, Vibration, Modal Identification, Dynamic Behavior, Natural Frequency, Modal Damping Ratio, and Modal StiffnessAdvanced Manufacturing Technology (AMT) is an important remark to measure the development of industry modernization and economic position of strength of a nation. In recent years, developed industrial nations have been launching lots of manpower and material resources to research and develop advanced manufacturing technology. Numerical Control Machine Tool (NCMT) is the basic equipment for advanced manufacturing technology. The quality and reliability level of numerical control machine tool will directly affect the development of advanced manufacturing technology of a nation.
Since 1952, the generation of the first numerical control machine tool in America, numerical control machine tool has been developed and changed from generation to generation. But the problem of reliability is still one of the main problems which impede the development of numerical control machine tools. Reliability is the key quality of numerical control machine tools, the requirement of the existence and development of an enterprise itself, the competition focus in the marketplace. Reliability technology is the key to the improvement of the quality of numerical control machine tools.
This dissertation is based on the project
“Research on the Basic Theory of Reliability for Numerical Control Machine Tools” sponsored by the eighth five-year plan of national science and technology key problem-tackling project. This dissertation is also supported by the ninth five-year plan of national science and technology key problem-tackling project “Research on the Practical Technology of Reliability Growth for Numerical Control Machine Tools”.This research will increase the reliability level of domestic numerical control machine tools, improve the prestige of domestic numerical control machine tools and sharpen their competition edge in the market place. This will play an important role in the development of machine building enterprises and the prosperity of Chinese machine building industry. Meanwhile, both users and whole society will benefit from the research.
This dissertation first discusses the procedure of analysis and setup of loading spectrum for numerical control lathes. It includes the collection, collation and codification of data, setup of database. It includes the calculation of loading of spindle and its corresponding number of cycles, the estimation of parameters of distribution model by means of the multiple regression method and the maximum likelihood method, the determination of the optimal distribution model by means of multi-factors fuzzy comprehensive evaluation. It also includes the realization of the whole process on computer.
This dissertation establishes the loading spectrum database for numerical control lathes and programs the corresponding software LST (Loading Spectrum Tools). The software is in modularization structure and is comprised of the preprocessing module and the post-processing module. The former is a series of special subroutines, which calculate the cutting force on the spindle and its corresponding number of cycles and generates the medium data. The latter is a series of universal subroutines, which preprocess data, estimate distribution parameters and determine the optimal distribution model. This software may be applied not only to loading spectrum analysis, but also to other stochastic analysis.
The paper first proposes the multi-factors fuzzy comprehensive evaluation method, which is used in loading spectrum analysis of CNC lathes and the method can also be used in failure analysis of CNC lathes. The loading spectrum of CNC lathes complies with the Gamma distribution with the shape parameter 0.6291 and the scale parameter 4.7561.
This dissertation presents the speed spectrum of CNC lathes, this is, the distribution model of spindle revolution of CNC lathes and its corresponding working time. The speed spectrum of CNC lathes fits Gamma distribution with shape parameter 2.40284, scale parameter 7.87035.
On the basis of above analysis, this dissertation proposes the concept of complex loading spectrum of CNC lathes for the first time, that is, the combined distribution principle of the torque of spindle and spindle speed of the CNC lathe. This concept solves the problem of the determination of loading spectrum for a given transmission element in step stepless speed regulation system. This dissertation presents the loading spectrum of feed system and its transmission elements of CNC lathes also.
It is well known that field failure data is the basis of failure analysis for CNC lathes. So long as a great lot of full and accurate and reliable failure data, failure analysis may be performed. So this dissertation, starting from the collection of data, collation and codification of data and establishment of database, performs failure analysis of CNC lathes. This dissertation presents the canonical procedure of field failure data collection for CNC lathes. This dissertation proposes the failure criterion for CNC lathes, it makes judgement and counting of field failure for CNC lathes practical and reliable. The paper defines failure positions and codes, failure modes and codes, failure causes and codes. On the basis of data collation and data codification, the paper establishes the failure database for CNC lathes.
The paper points out that reliability indexes of CNC lathes include reliability R(t), failure probability density f(t), failure rate l(t), mean time between successive failures (MTBF) , maintainability M(t), repair rate m(t), mean time to repair (MTTR) , instant availability Ai(t), mean availability A, first overhaul time Tm, precision-holding time TK and so on. The dissertation gives the methods for calculating the reliability indexes of CNC lathes, distribution models of time between successive failures and time to repairs and transform relationship among measures of characteristics of reliability for CNC lathes. Time between successive failures complies with the Weibull distribution with the shape parameter 0.749 and scale parameter 182.687; Time to repairs complies with the lognormal distribution with the mean 0.4713 and variance 0.9013.
This dissertation analyzes in detail failure modes for the whole machine, and for all subsystems and the failure criticality for CNC lathes. The paper points out those turret and fixture accessories are the weakest link of a CNC lathe. Electronic and electric system is another weak link of the CNC lathe. The paper first applies Principal Component Analysis Method (PCAM) into the failure analysis for CNC lathes. The result reveals that component failure, loose, fracture, blockage is the primary factor to the reliability of CNC lathes.
The dissertation establishes the fault tree for CNC lathes. By means of failure analysis, the dissertation sets up the reliability model for CNC lathes and opens out that a CNC lathe is composed in series of each subsystem and each subsystem is composed in series of every component. That is, the series model of reliability of CNC lathes.
Based on the investigation and research on the status of reliability level of CNC lathes and reliability research, the paper suggests that reliability design of CNC lathes should take the
“two-steps-to-go” measure. First, based on failure analysis, reliability improvement design by means of qualitative and quantitative method should be done; second, based on accumulation of data, quantitative reliability design should be done.The paper proposes the guide suggestions for reliability improvement design for components of CNC lathes.
The dissertation proposes and applies the complex fuzzy l allocation ratio method to allocate reliability quota to every subsystem of CNC lathes and calculates the reliability quota for each subsystem.
Finally, the paper researches the reliability design methods, proposes the calculation method of equivalent loading subjected to the transmission elements in step stepless speed regulation, and carries on the quantitative reliability design for the key components of CNC lathes.
Keywords:
CNC lathes, Reliability, Database, Complex Loading spectrum, Failure Analysis, Complex Fuzzy Allocation Ratio Method06-12-16 17:59