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Head Motion Detection in Gaze Based Aiming

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Journal of Beijing Institute of Technology 2020年第1期29卷 9-15页

作者： Minghe Cao jianzhong wang School of Mechatronical Engineering Beijing Institute of TechnologyBeijing 100081China

Unmanned weapons have great potential to be widely used in future *** gaze-based aiming technology can be applied to control pan-tilt weapon systems remotely with high precision and *** direction is related to head motion,which is a combination of head and eye *** this paper,a head motion detection method is proposed,which is based on the fusion of inertial and vision *** inertial sensors can measure rotation in high-frequency with good performance,while vision sensors are able to eliminate *** combining the characteristics of both sensors,the proposed approach achieves the effect of highfrequency,real-time,and drift-free head motion *** experiments show that our method can smooth the outputs,constrain drifts of inertial measurements,and achieve high detection accuracy.

关键词： gaze aiming head motion detection visual-inertial information fusion

Semi-solid Thixoforming Simulation of Al-Cu-Mn-Ti Alloy Parts via AnyCasting

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Journal of Materials Science & Technology 2007年第3期23卷 359-362页

作者： Ping wang jianzhong CUI Guimin LU Key Laboratory of Ministry of Education for Electromagnetic Processing of Materials Northeastern University Shenyang 110004 China

The software AnyCasting was used to simulate the thixotropic die-casting process of semi-solid Al-Cu-Mn-Ti alloy slurry to form the parts of a particular shape, especially on how the in-gate size of die and injection speed affect the process. The results showed that the die cavity can be filled well with the semi-solid slurry in form of laminar flow under conditions that the temperature of the semi-solid slurry is 640℃ and that of die 200-240℃, thickness of in-gate is 11 mm and, more important, the injection speed should be changed from 0.1 to 1.0 m/s when 60% of die cavity has been filled. The simulation result is highly proved in conformity to the actual die-casting specimens in accordance to the filling process as simulated. Moreover, the hardness of the specimens is up to 116.6 HV after the treatment of solid solution plus underaging, i.e. 45.7% higher than that in conventional ones.

关键词： Al-Cu-Mn-Ti alloy Seml-solid die casting Laminar flow Hardness

Casting structure of pure aluminum by electric pulse modification at different superheated temperatures

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Journal of University of Science and Technology Beijing 2005年第6期12卷 527-530页

作者： Jingang Qi jianzhong wang Xingjiang Liu Bing wang Daqiang Cang Metallurgical and Ecological Engineering School University of Science and Technology Beijing Beijing 100083 China Department of Material and Chemical Engineering Liaoning Institute of Technology Jinzhou 121001 China

Electric pulse modification （EPM） is a novel technique that reduces grain size by altering the structure of a melt. It was investigated that the response of the casting structure of high pure aluminum to EPM in different superheated melts. The results indicate that the grain refining effect of a given pulse electric field holds an optimal temperature range, moreover, a lower or higher superheated temperature will both disadvantage the improvements of casting structure. It essentially lies in the cooperative action between the distorted absorption of clusters and the activated capability of atoms in the aluminum melt.

关键词： electric pulse modification superheat casting structure cluster activated ability

Effects of correlative factors on the interdendritic melt flow brought by the bulge in continuous casting slabs

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Journal of University of Science and Technology Beijing 2008年第4期15卷 407-411页

作者： Shuying Chen Guowei Chang jianzhong wang Chunjing Wu School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Department of Materials and Chemical Engineering Liaoning Institute of Technology Jinzhou 121001 China

The effects of various factors on the flow speed of interdendritic melt were analyzed in detail in the process of continuous casting slabs. When the solid-liquid interface bends periodically, the expression of solute distribution in the columnar crystal zone was deduced, and the quantitative calculation was also made. The results show that the bulge and the interdendritic spacing are responsible for the flow speed of interdendritic melt. At the initial stage of solidification the bulge operates, and at the final stage the interdendritic spacing operates. The experimental results of macrosegregation in the slabs validated the calculated results of the flow speed of interdendritic melt, which shows that the calculated results are basically consistent with the experimental ones.

关键词： continuous casting two-phase region melt flow macrosegregation

Structural, Optical and Electrical Properties of Li-doped ZnO Thin Films Influenced by Annealing Temperature

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Journal of Wuhan University of Technology(Materials Science) 2014年第5期29卷 873-876页

作者：王冰 TANG Lidan PENG Shujing wang jianzhong Department of Materials Science and Engineering Liaoning University of Technology Department of Chemical and Engineering Liaoning University of Technology

Li-doped ZnO thin films had been grown by radio frequency magnetron sputtering and then annealed under various annealing temperatures. The characteristics of ZnO films were examined by XRD, FESEM, Hall measurement and optical transmission spectra. Results showed that p type conduction was observed in Li doped ZnO films annealed at 500-600 ℃ and thep type ZnO films possessed a good crystalline with c-axis orientation, dense surface, and average transmission of about 85% in visible spectral region.

关键词： doping defects physical vapor deposition processes oxides semiconducting Ⅱ-Ⅵmaterials heterojunction semiconductor devices

Rapid air film continuous casting of aluminum alloy using static magnetic field

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Acta Metallurgica Sinica(English Letters) 2009年第5期22卷 339-344页

作者： Fu QU Huixue JIANG Gaosong wang Qingfeng ZHU Xiangjie wang jianzhong CUI Key Lab of Electromagnetic Processing of Materials Ministry of Education Northeastern UniversityShenyang 110004 China

The influences of the cooling style and static magnetic field on the air film casting process were investigated. Ingots of 6063 aluminum alloy were produced by AIRSOL VEIL casting with double-layer cooling water and static magnetic field. Surface segregation, hot crack and variation of solute content along the radius direction of ingot were examined. The results showed that double-layer cooling water can improve the surface quality and avoid of hot crack, which created conditions to increase the casting speed. The electromagnetic casting process can effectively improve the surface quality in high speed casting process, and static magnetic field has a great influence on solute distribution along the radius direction of ingot.

关键词： Air film casting Static magnetic field Surface quality Casting speed

Anti-Dropping Technology of Four-Wheeled Throwing Robot

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Journal of Beijing Institute of Technology 2018年第3期27卷 442-450页

作者： jianzhong wang Pengzhan Liu Jiadong Shi State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

Within the fields of reconnaissance and surveillance,there is an ongoing need to obtain information from areas that are hard to reach or unsafe to ***,using robots with high performance in detecting obstacles is advantageous in these *** anti-drop impact design is one of the challenges facing the design of the throwing *** this present study,the drop model of the four-wheeled mobile robot is established,while the response of the model under shock impact is *** the response of the model,we can obtain relationships between the maximum compression displacements of the wheels and the maximum acceleration of the robot,the drop height of the robot,the natural frequency of the impact *** the relationship between the maximum stress,the maximum deformation of the shell and the thickness of the shell,we can obtain the maximum acceleration of the *** to the relationships between the parameters,the optimal design parameters for the anti-dropping capability of the robot are chosen.A finite element model was established with Abaqus and a free fall from a height of 6 mto the solid ground was *** results show that the optimized structure can survive from the impact with solid ground from a free fall at a height of 6 m.

关键词： robotics investigation anti-dropping impact stress analysis

Parameter Identification and Application of Slippage Kinematics for Tracked Mobile Robots

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Journal of Beijing Institute of Technology 2019年第4期28卷 687-695页

作者： Hongyang Liu jianzhong wang Jian Gao School of Mechatronical Engineering Beijing Institute of TechnologyBeijing 100081China Great Wall Motor Co. Ltd.Baoding 071000HebeiChina

A new parameter identification method is proposed to solve the slippage problem when tracked mobile robots execute turning *** motion is divided into two states in this paper:pivot turning and coupled turning between angular velocity and linear *** the processing of pivot turning,the slippage parameters could be obtained by measuring the end point in a square *** the process of coupled turning,the slippage parameters could be calculated by measuring the perimeter of a circular path and the linear distance between the start and end *** identification results showed that slippage parameters were affected by ***,a fuzzy rule base was established with the basis on the identification data,and a fuzzy controller was applied to motion control and dead *** method effectively compensated for errors resulting in unequal tension between the left and right tracks,structural dimensions and *** results demonstrated that the accuracy of robot positioning and control could be substantially improved on a rigid floor.

关键词： tracked mobile robot tracked vehicle kinematics model slippage parameters fuzzy controller

Effect of casting speed on surface quality of horizontal direct chill casting 7075 aluminum alloy ingot

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Acta Metallurgica Sinica(English Letters) 2011年第5期24卷 399-404页

作者： Qingfeng ZHU Zhihao ZHAO jianzhong CUI Xiangjie wang Ke QIN Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University Shenyang 110819 China

7075 aluminum alloy ingot with the diameter izontal direct chill casting in different casting of 100 mm has been produced by horspeed. The effect of the casting speed on the ingot surface and subsurface layer was studied by surface observation and subsurface structure analysis. It was found that increasing the casting speed results in the adding of segregation knots in the ingot surface. The thickness of the dendrite microstrueture layer in the subsurface reduces with increasing the casting speed. And the elements of Zn, Cu and Mg enrich in the coarse dendrite microstructure layer of the ingot.

关键词： Horizontal direct chill casting Casting speed 7075 aluminumalloy Surface quality