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Dual-steering mode based on direct yaw moment control for multi-wheel hub motor driven vehicles:Theoretical design and experimental assessment

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Defence Technology（防务技术） 2022年第1期18卷 49-61页

作者： Zheng Zhang Xiao-jun Ma Chun-guang Liu Shu-guang Wei Department of Weapons and Control engineering Army Academy of Armored ForcesBeijing100072China

One of the main challenges for multi-wheel hub motor driven vehicles is the coordination of individual drivetrains to improve mobility and stability in the steering *** paper proposes a dual-steering mode based on direct yaw moment control for enhancing vehicle steering ability in complex environ *** control system is designed as a hierarchical structure,with a yaw moment decision layer and a driving force distribution *** the higher-level layer,the objective optimization function is con-structed to obtain the slip steering ratio,which represents the degree of vehicle slip steering in the dual-steering *** moment controller using active disturbance rejection control theory is designed for continuous yaw rate *** the actual yaw rate of the vehicle deviates from the reference yaw rate obtained by the vehicle reference model and the slip steering ratio,the yaw moment controller isactuated to determine the yaw moment demand for vehicle *** the lower-level layer,there is a torque distribution controller based on distribution rules,which meets the requirement of yaw moment demand without affecting the total longitudinal driving force of the *** verifying the validity and feasibility of the dual-steering mode,simulations were conducted on the hardware-in-loop real-time simulation ***,corresponding real vehicle tests were carried out on an eight-wheel prototype *** results were generally consistent with the simulation results,thereby demon-strating that the proposed dual-steering mode reduces steering radius and enhances the steering per-formance of the vehicle.

关键词： Multi-wheel hub motor driven vehide Dual-steering mode Direct ya w moment control Real-time simulation

Tribological behavior of magnetron sputtering CrMoN/MoS_2 composite coatings

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Acta Metallurgica Sinica(English Letters) 2012年第6期25卷 461-468页

作者： Yuelan DI Zhihai CAI Ping ZHANG Zhen YANG Qi LI Wei SHEN Department of Equipment Remanufacturing engineering Academy of Armored Forces Engineering Beijing100072 China

CrMoN composite coatings were deposited on the surface of the stainless steel by magnetron sputtering, then were treated by low temperature ion sulfuration. FESEM equipped with EDX was adopted to analyze the morphologies and compositions of the surface, cross-section and worn scar of the sulfuration layer. The valence states of the film surface were detected by XPS. The nano-hardness and nano-modulus of the layer were measured by a nano tester. The results of the friction and wear show that the CrMoN/MoS2 composite coating is a kind of ideal solid lubrication layer and possess an excellent antifriction and wear-resistance.

关键词： CrMoN/MoS2 Magnetron sputtering Low temperature ionsulfurizing Solid lubrication

Parameters of Exterior Ballistic Feature Points Extraction in Radar Measurement Data by EMD

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Journal of Beijing Institute of Technology 2018年第4期27卷 503-509页

作者： Wanjun Zhang Kailin Wang Xiaoying Wu Guohui Li Hongtian Liu Department of Arms engineering Academy of Army Armored Forces

The problem of measuring exterior ballistic feature points is always difficult to solve and it is essentiale on exterior ballistic *** analysis of radar reflection characteristics and non-stationary echo signals of exterior ballistic feature points,the echo data of exterior ballistic feature points is measured by using the continuous wave *** parameters of feature points are extracted by the empirical mode decomposition method(EMD)of Hilbert-Huang transform(HHT)spectrum analysis *** radar echo signal model and EMD extraction model are established to analyze the exterior ballistic mutation point detection and EMD extraction method of aliasing echo *** feature point parameters of exterior ballistic in rocket flight tests are carried out and the effectiveness of the method is verified.A new method of measuring the parameters of exterior ballistic feature point is therefore presented.

关键词： exterior ballistic characteristic points empirical mode decomposition method(EMD) continuous wave radar information extraction

High Efficiency Axial Deep Creep-Feed Grinding Machining Technology of engineering Ceramics Materials

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Journal of Wuhan University of Technology(Materials Science) 2012年第5期27卷 902-906页

作者：郭昉 Science and Technology on Remanufacturing Laboratory Academy of Armored Forces Engineering

Axial deep creep-feed grinding machining technology is a high efficiency process method of engineering ceramics materials, which is an original method to process the cylindrical ceramics materials or hole along its axis. The analysis of axial force and edge fracture proved the cutting thickness and feed rate could be more than 5-10 mm and 200 mm/min respectively in once process, and realized high efficiency, low-cost process of engineering ceramics materials. Compared with high speed-deep grinding machining, this method is also a high efficiency machining technology of engineering ceramics materials as well as with low cost. In addition, removal mechanism analyses showed that both median/radial cracks and lateral cracks appeared in the part to be removed, and the processed part is seldom destroyed, only by adjusting the axial force to control the length of transverse cracks.

关键词： ceramics materials axial deep creep-feed grinding small diamond grinding wheel removal mechanism

Preparation and Properties of Ni-plated Glass Beads/PVC Composite

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Journal of Wuhan University of Technology(Materials Science) 2014年第4期29卷 688-691页

作者：张伟 WANG Sijie ZHAO Yang National Key Laboratory for Remanufacturing Academy of Armored Forces Engineering

Ni-plated glass beads（GB） was obtained by electroless plating, based on PVC adhesive, Niplated GB/PVC composite was prepared. Temperature insulation, fi re retardation and microwave absorption properties were tested, the results showed that the nickel coating was compact and continuous, Ni-plated GB/ PVC composite is a kind of excellent temperature insulated, fi re retardate and light-weight material, and especially for microwave absorption well; Refl ectivity was lower than-2 dB in the frequency range of 11-17 GHz.

关键词： electroless plating Ni-plated glass beads PVC

Battlefield dynamic scanning and staring imaging system based on fast steering mirror

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Journal of Systems engineering and Electronics 2019年第1期30卷 37-56页

作者： CHANG Tianqing WANG Quandong ZHANG Lei HAO Na DAI Wenjun Department of Weapon and Control Army Academy of Armored Forces Center for Assessment and Demonstration Research Academy of Military Sciences Department of Science Research Army Academy of Armored Forces

This paper presents the design of an experimental battlefield dynamic scanning and staring imaging system based on a fast steering mirror(FSM), which is capable of real-time monitoring of hot targets and wide-area reconnaissance of hot regions. First,the working principle and working sequence of the FSM are briefly analyzed. The mathematical model of the FSM system is built by modeling its dynamic and electrical properties, and the rationality of the model is validated by means of model identification. Second,the influence of external sources of disturbance such as the carrier and moment on the control precision of the FSM is effectively suppressed by the jointly controlling of proportional integral(PI)and disturbance observer(DOB), thus realizing a high precision and strong robustness control of the FSM system. Then, this paper designs an experimental prototype and introduces a special optical structure to enable the infrared camera to share the FSM with the visible light camera. Finally, the influence of the velocity difference between the mirror of the FSM and the rotating platform on the imaging quality of the system is experimentally analyzed by using the image sharpness evaluation method based on point sharpness. A good dynamic scanning and staring imaging result is achieved when the velocity of these two components correspond.

关键词： fast steering mirror (FSM) dynamic scanning and staring backscanning compensation disturbance observer (DOB) point sharpness.

Oxidation performance of Fe-Al/WC composite coatings produced by high velocity arc sprayed at 800 ℃

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中国有色金属学会会刊:英文版 2004年第Z1期14卷 425-428页

作者： MENG Fan-jun XU Bin-shi ZHU Sheng MA Shi-ning ZHANG Wei ZHU Zi-xin National Key Laboratory for Remanufacturing Academy of Armored Forces Engineering Beijng 100072China

Fe-Al/WC intermetallic composite coatings were prepared by high velocity arc spraying (HVAS) technology on 20G steel and the oxidation performance of Fe-Al/WC composite coatings was studied. The results demonstrate that the kinetics curve of oxidation approximately follows the logarithmic law and the oxidation velocity of Fe-Al/WC composite coatings is less than that of 20G steel after 5 h. The composition of oxidized coating is mainly composed of Al2O3, Fe2O3, Fe3O4 and FeO. These phases distribute unevenly. The protective Al2O3 film firstly forms and preserves the coatings from further oxidation.

关键词： high temperature oxidation HVAS Fe-Al intermetallic composite coating

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

Polaron effects in cylindrical GaAs/Al_xGa_(1-x)As core-shell nanowires

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Chinese Physics B 2017年第9期26卷 415-420页

作者：孙慧刘炳灿田强 Department of Physics Beijing Normal University Department of Fundamental Courses Academy of Armored Forces Engineering

By the fractal dimension method, the polaron properties in cylindrical GaAs/AlxGa1-xAs core-shell nanowire are explored. In this study, the polaron effects in GaAs/AlxGa1-xAs core-shell nanowire at different values of shell width and aluminum concentration are discussed. The polaron binding energy, polaron mass shift and fractal dimension parameter are numerically worked out each as a function of core radius. The calculation results show that the binding energy and mass shift of the polaron first increase and then decrease as the core radius increases, forming their corresponding maximum values for different aluminum concentrations at a given shell width. Polaron problems in the cylindrical GaAs/AlxGa1-xAs core-shell nanowire are solved simply by using the fractal dimension method to avoid complex and lengthy calculations.

关键词： core-shell nanowire core radius polaron effects fractal dimension