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Design and manufacture of intelligent Cu-based wet friction materials

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中国有色金属学会会刊：英文版 2004年第5期14卷 864-869页

作者：丁华东韩文政傅苏黎杜建华遇元宏 department of Materials Science and engineering Academy of Armored Force Engineering Beijing 100072 China department of Discipline Academy of Armored Force Engineering Beijing 100072 China

The friction sheets working process was analyzed. It is found that its characteristic is microregion instantaneous high temperature and the current cooling method, making the sheets cooled by the lubricating oil flowing through the friction surface, is not very efficient. Then, intelligent materials concept was introduced, the component and microstructure of intelligent Cu-based friction materials were designed, and the intelligent Cu-based wet friction materials as well as sheets were manufactured. And the intelligent friction materials working principle, i.e. the materials cooling the friction microregion in real time or the friction sheets cutting the peak value of microregion instantaneous high temperature during friction process, was given depending on the characteristics of the materials’ and friction sheets’ working process. Finally, it is indicated that the intelligent friction sheets excell the currently used friction sheets in properties, including anti-heating property, anti-wearing property as well as friction characteristic.

关键词：智能金属汽车齿轮箱摩擦片铜基合金

Tribology properties of composite layer of CrMoCu alloy cast iron by combined treatment of ion nitrocarburizing and sulphurizing

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中国有色金属学会会刊：英文版 2004年第z1期14卷 315-318页

作者： MA Shi-ning HU Chun-hua LI Xin QIU Ji department of Materials Science and engineering Academy of Armored Force Engineering Beijing 100072 China Department of Materials Science and EngineeringAcademy of Armored Force Engineering Beijing 100072 China Department of Materials Science and EngineeringAcademy of Armored Force Engineering Beijing 100072 China Department of Materials Science and EngineeringAcademy of Armored Force Engineering Beijing 100072 China

Composite layer with nitrocarbonide and sulfide was made on the surface of CrMoCu alloy cast iron by combined treatment of ion nitrocarburizing and sulphurizing. The composite layer is composed of sulfide layer, nitrocarbonide hypo-surface layer and its diffusing layer, the size of sulfide globular grains distributing equably on the surface is in nano-micron-scale, and the phase structure of the composite layer is composed of FeS, FeS1-x, Fe2C and Fe3N. Under oil lubrication, sulphurized surface shows good scuffing-resistance only under low velocity, and nitrocarburized and sulphurized surface greatly improves the scuffing-resistance and wear-resistance of CrMoCu alloy cast iron, its integrated friction and wear properties are better than those of the plain and sulphurized surfaces under all the velocities.

关键词： ion nitrocarburizing ion sulphurizing combined treatment friction and wear properties

Characteristic Verification and Parameter Optimization of Airbags Cushion System for Airborne Vehicle

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Chinese Journal of mechanical engineering 2014年第1期27卷 50-57页

作者： WANG Hongyan HONG Huangjie HAO Guixiang DENG Huaxia RUI Qiang LI Jianyang department of mechanical engineering Academy of Armored Force Engineering School of Instrument Science and Opto-electronics engineering Hefei University of Technology

Abstract： The major methods to investigate the airbags cushion system are experimental method, thermodynamic method and finite element method （FEM）. Airbags cushion systems are very complicated and very difficult to be investigated thoroughly by such methods For experimental method, it is nearly impossible to completely analyze and optimize the cushion characteristics of airbags of airborne vehicle because of charge issue, safety concern and time constraint. Thermodynamic method fails to take the non-linear effects of large airbag deformation and varied contact conditions into consideration. For finite element method, the FE model is usually complicated and the calculation takes tens of hours of CPU time. As a result, the optimization of the design based on a nonlinear model is very difficult by traditional iterative approach method. In this paper, a model based on FEM and control volume method is proposed to simulate landing cushion process of airborne vehicle with airbags cushion system in order to analyze and optimize the parameters in airbags cushion system. At first, the performance of airbags cushion system model is verified experimentally. In airdrop test, accelerometers are fixed in 4 test points distributed over engine mount, top, bottom and side armor plate of hull to obtain acceleration curves with time. The simulation results are obtained under the same conditions of the airdrop test and the simulation results agree very well with the experimental results, which indicate the established model is valid for further optimization. To optimize the parameters of airbags, equivalent response model based on Latin Hypercube DOE and radial basis function is employed instead of the complex finite element model. Then the optimal results based on equivalent response model are obtained using simulated annealing algorithm. After optimization, the maximal acceleration of airborne vehicle landing reduces 19.83%, while the energy absorption by airbags increases 7.85%. The

关键词： airborne vehicle airbag nonlinear finite element method verification equivalent response model

Syntheses and Tribological Property of CrMoN/MoS2 Multilayer Films on Piston Rings of Heavy Vehicle Engine

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Journal of Wuhan University of Technology(Materials Science) 2016年第2期31卷 429-434页

作者：王宪成李奇 LI Ruoting DI Yuelan department of mechanical engineering Academy of Armored Forces EngineeringBeijing 100072China .department of Equipment Repairing and Remanufacture engineering Academy of Armored Force EngineeringBeijing 100072China

In order to prolong the service life of piston rings of heavy vehicle engine and decrease the friction and wear of piston rings and cylinder liner,CrMoN/MoS_2 multilayer films were deposited on the surface of rings by magnetron sputtering and low temperature ion *** equipped with EDX was adopted to analyze the compositions and morphologies of surface,cross-section,and wear scars of the multilayer *** nano-hardness and Young＇s modulus of the films were measured by a nano *** of the films were tested by an SRV~174;4 wear *** experimentalresults indicate that the structures of the multilayer films are dense and *** films possess nano hardness value of approximately 26.7 GPa and superior ability of plastic deformation *** multilayer films can activate solid lubricating,and possess an excellent antifriction and wear resistance under the conditions of heavy load,high frequency,high temperature,and dynamic load.

关键词： CrMoN/MoS_2 multilayer films piston ring cylinder liner wear mechanisms

Surface nanostructure formation mechanism of 45 steel induced by supersonic fine particles pombarding

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Journal of University of Science and Technology Beijing 2008年第5期15卷 561-567页

作者： Dema Ba Shining Ma Changqing Li Fanjun Meng department of Remanufacture engineering Academy of Armored Force Engineering Beijing 100072 China

By means of supersonic fine particles bombarding （SFPB）,a nanostructured surface layer up to 15 μm was fabricated on a 45 steel plate with ferrite and pearlite phases. To reveal the grain refinement mechanism of SFPB-treated 45 steel,microstructure features of various sections in the treated surface were systematically characterized by X-ray diffraction （XRD）,scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. Grain size increases with an increase of depth from the treated surface. Plastic deformation and grain refinement processes are accompanied by an increase in strain. Plastic deformation in the proeutectoid ferrite phases has precedence over the pearlite phases. Grain refinement in the ferrite phases involves： the onset of dislocation lines （Dls）,dislocation tangles （DTs） and dense dislocation walls （DDWs） in the original grains; the formation of fine lamellar and roughly equiaxed cells separated by DDWs; by dislocation annihilation and rearrangement,the transformation of DDWS into subboundaries and boundaries and the formation of submicron grains or subgrains; the successive subdivision of grains to finer and finer scale,resulting in the formation of highly misoriented nano-grains. By contrast,eutectoid cementite phase accommodated strain in a sequence as follows： onset of elongated,bended and shear deformation under deformation stress of ferrites,short and thin cementites with a width of about 20-50 nm and discontinuous length were formed. Shorter and thinner cementites were developed into ultra-fine pieces under the action of high density dislocation and strains. At the top surface,some cementites were decomposed under severe plastic deformation. Experimental evidences and analysis indicate that surface nanocrystallization of 45 steel results from dislocation activities,high strains and high strain rate are necessary for the formation of nanocrystallites.

关键词： surface nanocrystallization grain refinement mechanism microstructure 45 steel

Adaptive Fuzzy Control for CVT Vehicle

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Journal of Beijing Institute of Technology 2005年第3期14卷 344-348页

作者：方志强王红岩王良曦 department of mechanical engineering Academy of Armored Force Engineering Beijing 100072 China department

On the simple continuously variable transmission （CVT） driveline model, the design of adaptive fuzzy control system for CVT vehicle is presented. The adaptive fuzzy control system consists of a scaling factor self-tuning fuzzy-PI throttle controller, and a hybrid fuzzy-PID CVT ratio and brake controller. The presented adaptive fuzzy control strategy is vehicle model independent, which depends only on the instantaneous vehicle states, but does not depend on vehicle parameters. So it has good robustness against uncertain vehicle parameters and exogenous load disturbance. Simulation results show that the proposed adaptive fuzzy strategy has good adaptability and practicality value.

关键词： continuously variable transmission (CVT) adaptive fuzzy control simulation

Characteristic analysis of magnetorheological fluid based on different carriers

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Journal of Central South University 2008年第S1期15卷 252-255页

作者：张建张进秋贾进峰 department of Technical Support engineering Academy of Armored Force Engineering

In order to prepare special MRFs to satisfy the demands of tracked vehicle,two different carrier fluids were used to prepare *** of MRF,which are based on carrier of special shock absorption fluid and 45# transformer oil,was *** characteristics of these samples were tested and *** results show that Tween-80 and Span-80 can improve the sedimentary stability,and the larger mass fraction can also increase the sedimentary *** 45# transformer oil instead of special shock absorption fluid as a carrier of MRF,the shear yield stress remains nearly constant but the viscosity and the sedimentary stability are *** MRF with diameter of 2.73 μm shows better sedimentary stability than that of the MRF with diameter of 2.30 μm,or 4.02 μ*** acid obviously improves sedimentary stability and off-state viscosity,but has no function on the shear yield *** magnetic field of 237 kA/m,the shear yield stress of MRF based on special shock absorption fluid is 18.34 kPa and the shear yield stress of MRF based on 45# transformer oil is 14.26 kPa.

关键词： magnetorheological fluid 45# transformer oil shear yield stress off-state viscosity sedimentary stability

Virtual instrument for monitoring process of brush plating

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中国有色金属学会会刊：英文版 2004年第z1期14卷 126-131页

作者： JING Xue-dong XU Bin-shi WANG Cheng-tao ZHU Sheng DONG Shi-yun School of mechanical engineering Shanghai Jiaotong University Shanghai 200030 China National Key Laboratory for Remanufacturing Academy of Armored Force Engineering Beijing 100072 China National Key Laboratory for Remanufacturing Academy of Armored Force Engineering Beijing 100072 China School of Mechanical Engineering Shanghai Jiaotong University Shanghai 200030 China National Key Laboratory for Remanufacturing Academy of Armored Force Engineering Beijing 100072 China National Key Laboratory for Remanufacturing Academy of Armored Force Engineering Beijing 100072 China

A virtual instrument(Ⅵ) was developed to monitor the technological parameters in the process of brush plating, including coating thickness, brush-plating current, current density, deposition rate, and brush plating voltage. Meanwhile two approaches were presented to improve the measurement accuracy of coating thickness. One of them aims at eliminating the random interferences by moving average filtering; while the other manages to calculate the quantity of electricity consumed accurately with rectangular integration. With these two approaches, the coating thickness can be measured in real time with higher accuracy than the voltage-frequency conversion method. During the process of plating all the technological parameters are displayed visually on the front panel of the Ⅵ. Once brush current or current density overruns the limited values, or when the coating thickness reaches the objective value, the virtual will alarm. With this Ⅵ, the solution consumption can be decreased and the operating efficiency is improved.

关键词： brush plating virtual instrument coating thickness measurement nano-composite coating

Wear-resistance and anti-scuffing of multi-arc ion plating molybdenum films

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中国有色金属学会会刊：英文版 2004年第z1期14卷 391-394页

作者： WANG Hai-dou XU Bin-shi LIU Jia-jun ZHUANG Da-ming National Key Laboratory for Remanufacturing Academy of Armored Force Engineering Beijing 100072 China National Key Laboratory for Remanufacturing Academy of Armored Force Engineering Beijing 100072 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China

The multi-arc ion plating technology was employed to prepare the molybdenum films with thickness of 3 μm on the AISI 1045 steel. The wear and scuffing tests were carried out on the ball-on-disc tester. AFM and SEM equipped with EDS were adopted to observe and analyze the morphologies and element compositions of surface,cross-section and worn scar of the Mo film. The phase structure was studied by XRD and the bonding strength between Mo film and substrate was measured by scratching tester. The tribological experiments show that the Mo film possesses a good wear-resistance and an excellent anti-scuffing property. The failure mechanism of Mo film under extreme condition is flaking off.

关键词： multi-arc ion plating molybdenum film wear and scuffing