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2012 International Conference on Biomaterial and Bioengineering(ICBB 2012)

作者： Mingzhe Xi Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University) Ministry of Education of China

A thermo-kinetic model for the transient thermal stress field of the wall-shaped part produced using laser direct powder deposition process is developed. In case of numerical modeling, the capabilities of ANSYS parametric design language and the the ‘birth and death' element technique were employed. The distribution of the thermal stress of the wall-shaped part at different time was calculated by the model. Results show that during process, the X-direction thermal stress within top layer of the wall-shape part and that within the interior deposited layers of the wall-shape part was tensile stress and compressive stress, respectively. The deformation of the wall-shaped part and base plate was also calculated.

关键词： Finite element analysis Transient thermal stress field Laser direct powder deposition 316L stainless steel powder

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Finite element simulation and microstructure of two-pass inner spinning process of curved-generatrix cone cylindrical parts with annealing/quenching

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Journal of Central South University 2019年第12期26卷 3305-3314页

作者： HAO Zeng-liang YANG Zhe-yi) WEI Wei LIU Lei LUO Jun-ting LIU Jin-heng Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Hebei Construction Material Vocational and Technical College Qinhuangdao 066000China

A two-pass annealing/quenching internal spinning process with small-end rotations is proposed to form a curved generatrix conical thin-walled *** is,annealing at 360°C for 2 h followed by the 1st pass spinning,and finally quenching in ice water after holding for 1 h at 498°C followed by the 2nd pass *** finite element software is used to simulate the internal spinning process of the products formed under different forming *** distribution laws of spinning force,the stress and strain under different forming processes were compared and *** mechanical properties and microstructure of the products are subsequently *** results show that the strain and the residual stress in the skin area of the formed products under two-pass spinning process more uniform,and the hardness and the mechanical performance are *** microstructure of the products formed with the 0.15 mm thickness reduction at the 2nd pass is *** the second phase grain size distributed uniformly in the range of 36μ***,the second phase particles are broken seriously and the size distribution inhomogeneity is increased when the thickness reduction in the skin area is greater than 0.20 mm at the 2nd pass spinning process.

关键词： curved generatrix conical internal spinning process annealing/quenching small-end rotations finite element simulation

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Densification,microstructural features and tensile properties of selective laser melted AlMgSiScZr alloy from single track to block specimen

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Journal of Central South University 2021年第4期28卷 1129-1143页

作者： BI Jiang CHEN Yan-bin CHEN Xi STAROSTENKOV M D DONG Guo-jiang Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China General Physics Department Polzunov Altai State Technical UniversityBarnaul 656038Russia

The selective laser melting(SLM)processed aluminum alloys have already aroused researchers’attention in aerospace,rail transport and petrochemical engineering due to the comprehensive advantages of low density,good corrosion resistance and high mechanical *** this paper,an Al-14.1Mg-0.47Si-0.31Sc-0.17Zr alloy was fabricated via *** characteristics of single track at different process parameters,and the influence of hatch spacing on densification,microstructural features and tensile properties of block specimens were systematically *** hatch spacing has an influence on the overlap ratio of single track,and further affects the internal forming quality of printed *** a laser power of 160 W and scanning speed of 400 mm/s,the densification of block specimen increased first and then decreased with the increase of hatch *** nearly full dense specimen(98.7%)with a tensile strength of 452 MPa was fabricated at a hatch spacing of 80μ*** characteristics of dimple and cleavage on the tensile fracture of the AlMgSiScZr alloy showed the mixed fracture of ductility and brittleness.

关键词： selective laser melting aluminum alloy hatch spacing microstructural feature tensile properties

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Analysis on performance and test of a new type of ultra-high pressure pipe joint

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High technology Letters 2018年第2期24卷 203-207页

作者： Zhai Fugang Kong Xiangdong Sun Yugang Wang Zhong Hao Xiaobei College of Mechanical Engineering Yanshan University Qinhuangdao 066004 P. R. Chin Key Laboratory of Advanced Forging ＆ Stamping Technology and Science （Yanshan University） Ministry of Education of China Qinhuangdao 066004 P. R. Chin Huaye Power Technology Co. Foshan 528300 P. R. China

Analysis as well as application of ultra-high pressure hydraulic system and elements has become a trend. The structure and operation principle of a new type of ultra-high pressure pipe joint is introduced. The structure of the new type of ultra-high pressure pipe joint is simple and is easy to be produced. The finite element model on two working conditions( preload condition with 30 N·m torque and static-loading condition with 70 MPa pressure) is built and computed. The width of contact area,the equivalent stress status,as well as the contact pressure status are plotted and analyzed. According to the national standard,test on air-tightness,blasting,and cyclic endurance is conducted and the results show that the new type of ultra-high pressure pipe joint has the sealability for ultra-high pressure up to 70 MPa,and the DN6 ultra-high pressure pipe joint can provide effective seal under70 MPa fluid pressure. The research can provide a thinking and method on designing ultra-high pressure pipe joint and push forward the development of ultra-high pressure hydraulic system.

关键词： pipe joint ultra-high pressure sealing performance hydraulic system

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The deformation characteristics of hydro-forming of differential gear box for automobile

The deformation characteristics of hydro-forming of differen...

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作者： Huang, Wen Yu, Hai Bo Lu, Hong Qin, Si Ji National Engieering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University Qinhuangdao Hebei 066004 China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao Hebei 066004 China

ISBN: (纸本)9783038351221

The hydroforming process of differential gear box for automobile under axial compressive load and internal bulging pressure was simulated and the load paths were optimized. The hydroforming process is divided into two steps. The deformation under different load paths was investigated using dynamic explicit finite element method. The distribution of equivalent strain and thickness was investigated as well. The simulation results show that the forming path for the first step is optimal when internal pressure changes linearly from 37MPa to 65MPa with the axial displacement. © (2014) Trans Tech Publications, Switzerland.

关键词： Finite element method

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Simulation and experimental research of digital valve control servo system based on CMAC-PID control method

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High technology Letters 2017年第3期23卷 306-314页

作者：赵劲松 Zhao Zining Wang Zhipeng Zhang Chuanbi Yao Jing Hebei Province Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao 066004 P. R. China Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University) Ministry of Education of China Qinhuangdao 066004 P. R. China School of Mechanical Engineering Yanshan University Qinhuangdao 066004 P. R. China

Digital valve control servo system is studied in this paper. In order to solve the system problems of poor control precision and slow response time,a CMAC-PID( cerebellar model articulation controller-PID) compound control method is proposed. This compound controller consists of two components: one is a traditional PID for the feedback control to guarantee stability of the system; the other is the CMAC control algorithm to form a feed-forward control for achieving high control precision and short response time of the controlled plant. Then the CMAC-PID compound control method is used in the digital valve control servo system to improve its control performance. Through simulation and experiment,the proposed CMAC-PID compound control method is superior to the traditional PID control for enhancing stability and robustness,and thus this compound control can be used as a new control strategy for the digital valve control servo system.

关键词： electro-servo system digital hydraulic digital valve CMAC-PID compound control rapid control prototyping technology

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Reliability optimization of multi-state hydraulic system based on T-S fault tree and extended PSO algorithm

Reliability optimization of multi-state hydraulic system bas...

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6th IFAC Symposium on Mechatronic Systems, MECH 2013

作者： Yao, Chengyu Wang, Bin Chen, Dongning Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao China

ISBN: (纸本)9783902823311

In order to overcome the difficulty of constructing the multi-state system's reliability optimization model, and the shortage of premature convergence of PSO (Particle Swarm Optimization) algorithm, a new reliability optimization method based on T-S fault tree and EPSO (Extended PSO) algorithm is proposed. According to the T-S fault tree and T-S rules of the events, the multi-state system reliability optimization model is constructed, at the same time, given constraint conditions on the system cost, weight and volume, and combined with the death penalty to construct the fitness function. Furthermore, EPSO algorithm based on the attraction and repulsion forces in the artificial physics is applied to the reliability optimization of multi-state hydraulic system. Comparing with PSO algorithm, the results of EPSO algorithm are in a better performance in obtaining global optimal solution. © 2013 IFAC.

关键词： Trees (mathematics)

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Reliability prediction method of hydraulic system by fuzzy theory

Reliability prediction method of hydraulic system by fuzzy t...

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6th IFAC Symposium on Mechatronic Systems, MECH 2013

作者： Chen, Dongning Yao, Chengyu Feng, Zhongkui Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao China Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao China

ISBN: (纸本)9783902823311

The hydraulic system's reliability is a key factor to ensure the reliable operation of equipment and it is very important to evaluate reliability of hydraulic system. The paper describes a reliability prediction method that may be used to evaluate the reliability of hydraulic systems for industrial applications. The proposed method takes advantage of fuzzy set theory. The aim of this method is to minimize the deficiencies of the traditional reliability prediction methods treating a failure rate as fixed value due to insufficiency practice data. Triangular fuzzy number and Gaussian fuzzy number are used in the application of this prediction method, where environmental factor, derating factor, and other factors are considered. Finally, an example of type crane's hydraulic system is given to verify the feasibility and practicability of the method. © 2013 IFAC.

关键词： Fuzzy set theory

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Model-based Synchronous Control of Redundantly Actuated Parallel Manipulator with Neural Network

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Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 2018年第2期49卷 367-375页

作者： Liu, Xiaofei Yao, Jiantao Zhao, Yongsheng Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education Yanshan University Qinhuangdao066004 China Key Laboratory of Parallel Robot and Mechatronic System of Hebei Province Yanshan University Qinhuangdao066004 China

Redundantly actuated parallel manipulator demands higher actuation coordination than the non-redundantly actuated one, thanks to its degree of actuation exceeding its degree of freedom. To improve the actuation coordination of redundantly actuated parallel manipulator, a novel model-based driving force synchronous control method with neural network was proposed. With 6PUS+UPU parallel manipulator as object, dynamic model was derived based on virtual work principle. To improve the actuation coordination of redundantly actuated parallel manipulator, a novel driving force synchronous control method was proposed on basis of force-position hybrid actuation. The synchronous control method was based on the driving force error of actuated joints and driving force adjustment was calculated by the synchronous controller. The synchronous controller was designed with neural network. What's more, the learning law of neural network controller was derived with manipulator's dynamic model to improve the learning efficiency. Model simulation and prototype experiment were carried out, and a performance comparison analysis with traditional force-position hybrid actuation method was made to verify the proposed control method. Comparison analysis revealed that, comparing with the traditional force-position hybrid actuation method, driving force synchronous control with neural network proposed could effectively improve the actuation coordination of redundantly actuated parallel manipulator. The results revealed that the synchronous control method reduced the driving force errors of whole manipulator by properly magnifying the control error of force actuated joint. © 2018, Chinese Society of Agricultural Machinery. All right reserved.

关键词： Dynamic models

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Driving force synchronous control of redundantly actuated parallel manipulator

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Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS 2018年第9期24卷 2140-2149页

To improve the actuation coordination of redundantly actuated parallel manipulator, a novel model-based driving force synchronous control method was proposed. With 6PUS+UPU parallel manipulator as the research object, the dynamics model was deduced based on virtual work principle, and the coordination mechanism of driving force under scheduled motion was analyzed. On the basis of force-position hybrid actuation, a driving force synchronous control method was proposed, and the control algorithm was designed with coordination mechanism. Simulation and prototype experiment were used to verify the proposed control method. © 2018, Editorial Department of CIMS. All right reserved.

关键词： Manipulators

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