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MINITYPE MACHINING SYSTEM FOR DIAMOND LAPPING & POLISHING BY USING BRUSHLESS DIRECT CURRENT MOTOR AS PRECISE SPINDLE

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Chinese Journal of mechanical Engineering 2008年第2期21卷 27-30页

作者： FU Huinan CHEN Dongsheng ZHAO Yong LIN Binquan School of mechanical and electrical Engineering Guangdong University of Technology Guangzhou 510006 China

A minitype precise spindle system which can machine precisely and stably in the process of diamond lapping and polishing is designed. In such minitype spindle system, the brushless DC spindle motor is used to drive the lapping finish table, which is built with fluid dynamic bearings. Some measures have been taken to make the lapping system dynamic balance, and a servo controller which can adjust the speed of motor from 1200 r/min to 5400 r/min is designed. Experiments show that the spindle system is reliable and stable for diamond polishing, and the detection results by atomic force microscope（AFM） show that the surfaces of diamond edge＇s Ra is 6.725 nm and whole diamond average Ra is 3.25 nm.

关键词： Diamond Lapping & polishing Spindle system

Hydrothermal synthesis and optical properties of Zn_(1-x)Mn_xS nanorods

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Particuology 2011年第5期9卷 533-536页

作者： Yangfeng Huang Yebin Cai Hao Liu School of mechanical ＆ electrical Engineering Guangdong University of Petrochemical Technology Maoming 525000 China

Zn1-xMnxS （x = 0-0.05） nanorods were successfully synthesized through a hydrothermal route. The morphology, composition and microstructure of Zn1-xMnxS nanorods were characterized respectively by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and Raman spectrometer. The optical properties of Zn1-xMnxS nanorods were determineded by UV-Vis absorption spectroscopy and photo- luminescence （PL） emission spectroscopy. The results show that the introduction of Mn^2＋ on interstitial sites in ZnS lattice has significant influence on the Raman spectra, UV-Vis absorption spectra and PL emis- sion spectra. With the increase of Mn^2＋, the lengths of the sampled nanorods become shorter and the morphologies of the products show disorder accompanied by some nanoparticles. The absorption band edge shifts to longer wavelength. The intensity of the ZnS-related emission gradually becomes weaker, whereas, the Mn^2＋-related broad emission spectra located at 580 nm gradually red-shifts and increases. Occupation of Zn^2＋ sites in the lattice by Mn^2＋ ions results in lattice distortion and influences the energy level structure of ZnS. The Mn doping is found responsible for the changes in the defect-related emission of the ZnS nanorods.

关键词： Inorganic compound Chemical synthesis Nanostructures Optical properties

Morphology-controllable synthesis and characterization of CeO_2 nanocrystals

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Particuology 2011年第2期9卷 170-173页

作者： Yangfeng Huang Yebin Cai Dongkai Qiao Hao Liu School of mechanical & electrical Engineering Guangdong University of Petrochemical Technology Maoming 525000 China

CeO2 nanocrystals with different morphologies were synthesized by adjusting the pH value of the starting solution in water-in-oil microemulsion. The obtained samples were characterized by transmission electron microscopy （TEM）, X-ray diffraction （XRD）. thermogravimetric analysis and different thermal analysis （TGA/DTA）, Brunauer-Emmet-Teller （BET） surface area measurement, ultraviolet-visible absorption （UV-vis） spectroscopy and photoluminescence （PL） spectroscopy. Results show that the mor- phologies of CeO2 were transformed from granular to spherical and to rod-like while the pH of the starting solution varied from 5 to 8 and to 11. All samples were indexed to the phase of Ce02 and Ce（OH）4, and the molar ratio of Ce02 to Ce（OH）4 was deduced to be about 0.25, The morphologies of CeO2 nanocrystals had but slight influence on their specific surface areas, UV-vis spectra and PL spectra, The band gap energies of different morphological samples were estimated by UV-vis spectroscopic method,

关键词： CeO2 pH value Synthesis Morphology Characterization

ARTIFICIAL NEURAL NETWORK AND FUZZY LOGIC CONTROLLER FOR GTAW MODELING AND CONTROL

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Chinese Journal of mechanical Engineering 2002年第1期15卷 53-56页

作者： Gao Xiangdong Faculty of mechanical and electrical Engineering，guangdong University of Technology， Guangzhou 510090，China Huang Shisheng South China University of Technology Faculty of mechanical and electrical Engineering Guangdong University of Technology Guangzhou 510090 China

An artificial neural network(ANN) and a self-adjusting fuzzy logiccontroller(FLC) for modeling and control of gas tungsten arc welding(GTAW) process are *** discussion is mainly focused on the modeling and control of the weld pool depth with ANN and theintelligent control for weld seam tracking with FLC. The proposed neural network can produce highlycomplex nonlinear multi-variable model of the GTAW process that offers the accurate prediction ofwelding penetration depth. A self-adjusting fuzzy controller used for seam tracking adjusts thecontrol parameters on-line automatically according to the tracking errors so that the torch positioncan be controlled accurately.

关键词： Artificial neural network Fuzzy logic control Weld pool depth Seamtracking

GENERATE ROUGH TOOL-PATHS FROM UNORGANIZED POINT-CLOUD DIRECTLY

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Chinese Journal of mechanical Engineering 2007年第5期20卷 1-4页

作者： WU Shixiong WANG Chengyong FAN Jingming School of mechanical and electrical Engineering Guangdong University of Technology Guangzhou 510006 China

An approach is presented to generate rough interference-free tool-paths directly from massive unorganized data in rough machining that is performed by machining volumes of material in a slice-by-slice manner. Unorganized point-cloud is firstly converted to cross-section data. Then a robust data-structure named tool-path net is constructed to save tool-path data. Optimal algorithms for partitioning sub-cut-areas and computing interference-free cutter-locations are put forward. Finally the tool-paths are linked in a zigzag milling mode, which can be transformed into a traveling sales man problem. The experiment indicates optimal tool paths can be acquired, and high computation efficiency can be obtained and interference can be avoided successfully.

关键词： Rough machining Tool path Unorganized point-cloud

Heat Transfer Performance and Structural Optimization of a Novel Micro-channel Heat Sink

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Chinese Journal of mechanical Engineering 2022年第2期35卷 189-200页

作者： Jianhua Xiang Liangming Deng Chao Zhou Hongliang Zhao Jiale Huang Sulian Tao School of mechanical and electrical Engineering Guangzhou UniversityGuangzhou 510006China Department of mechanical and electrical Engineering Xiamen UniversityXiamen 361005China Department of mechanical Engineering Guangdong Technical College of Water Resources and Electric EngineeringGuangzhou 510925China

With the advent of the 5G era,the design of electronic equipment is developing towards thinness,intelligence and multi-function,which requires higher cooling performance of the ***-channel heat sink is promising for the heat dissipation of super-thin electronic *** this study,thermal resistance theoretical model of the micro-channel heat sink was first ***,fabrication process of the micro-channel heat sink was ***,heat transfer performance of the fabricated micro-channel heat sink was tested through the developed testing *** show that the developed micro-channel heat sink has more superior heat dissipation performance over conventional metal solid heat sink and it is well suited for high power LEDs ***,the micro-channel structures in the heat sink were optimized by orthogonal *** on the orthogonal optimization,heat dissipation performance of the micro-channel radiator was further improved.

关键词： Micro-channel Phase change heat sink Heat transfer performance testing Finite element simulation Orthogonal test

Selective Laser Melting Molding of Individualized Femur Implant:Design,Process,Optimization

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Journal of Bionic Engineering 2021年第1期18卷 128-137页

作者： Guoqing Zhang Junxin Li Jin Li Xiaoyu Zhou Juanjuan Xie Anmin Wang School of mechanical and electrical Engineering Zhoukou Normal UniversityZhoukou 466000China School of mechanical and Automotive Engineering South China University of TechnologyGuangdong 510640China

Efective Selective Laser Melting(SLM)molding methods for femur implant design and molding can improve femur implant surgerysucess rates and enhance patients quality of *** this study,an individualized femur implant and individualized biological fixed-typefenur implant were designed using the parametric modeling *** implants were then directly manufactured via SLM moldingtechnology as the forming process was carefuly *** results indicate that the proposed implant allows for favorable conjunctionof the reconstructed implant model with the surrounding bone tissues under the premise of a relatively small amount of *** implant also shows even pore distribution,good overall connectivity,relatively high bearing capacity,favorable overlappingbetween supports,and strong inter-pore *** a small amount of powder adheres onto the surface and can be directly usedafter simple sand blasting and *** comprehensive analyses of fenur implant modeling and molding methods given in this papermay provide a sound foundation for the design and direct manufacture of individualized femur implants in the future.

关键词： selective laser melting femur implant parametric modeling personalized design molding process

Autonomous Control Strategy of a Swarm System Under Attack Based on Projected View and Light Transmittance

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维普期刊数据库

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IEEE/CAA Journal of Automatica Sinica 2021年第3期8卷 648-655页

作者： Xuejing Lan Wenbiao Xu Zhijia Zhao Guiyun Liu School of mechanical and electrical Engineering Guangzhou UniversityGuangzhou 510006China guangdong Province Institute of Metrology Guangzhou 510405China

In the study of a visual projection field with swarm movements,an autonomous control strategy is presented in this paper for a swarm system under *** ensure a fast swarm dynamic response and stable spatial cohesion in a complex environment,a new hybrid swarm motion model is proposed by introducing global visual projection information to a traditional local interaction *** the face of attackers,individuals move towards the largest free space according to the projected view of the environment,rather than directly in the opposite direction of the ***,swarm individuals can certainly regroup without dispersion after the attacker *** the other hand,the light transmittance of each individual is defined based on global visual projection information to represent its spatial freedom and relative position in the ***,an autonomous control strategy with adaptive parameters is proposed according to light transmittance to guide the movement of swarm *** simulation results demonstrate in detail how individuals can avoid attackers safely and reconstruct ordered states of swarm motion.

关键词： Autonomous control light transmittance projected view swarm system

Predicting for Power Battery SOC Based on Neural Network 36

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Predicting for Power Battery SOC Based on Neural Network