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Reliability Prediction Method of Hydraulic System by Fuzzy Theory

IFAC Proceedings Volumes 2013年第5期46卷 457-462页

作者： Dongning Chen Chengyu Yao Zhongkui Feng Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao China (Tel: ***) Key Laboratory of Advanced Forging & 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

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.

关键词： Type crane Hydraulic system Reliability prediction Fuzzy theory Reliability logic diagram

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Reliability Optimization of Multi-state Hydraulic System Based on T-S Fault Tree and Extended PSO Algorithm

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IFAC Proceedings Volumes 2013年第5期46卷 463-468页

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

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.

关键词： Hydraulic system Reliability optimization Multi-state T-S fault tree EPSO algorithm

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Prediction and experimental verification of springback control on tailor welded blanks of high strength steel air bending process

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ICIC Express Letters 2013年第10期7卷 2811-2816页

作者： Duan, Yongchuan Guan, Yingping Wu, Bin Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education of China Yanshan University No. 438 Hebei Ave Qinhuangdao 066004 China School of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology No. 100 Pingleyuan Chaoyang District Beijing 100022 China

The analytical springback prediction model of tailor welded blanks (TWBs) of high strength steel for air bending process is put forward;the forming process is divided into non-warp around condition and warp around condition respectively. At the air bending unloading phase, the interaction moment of the two parent blanks is introduced to the model, and then the unloaded angle is obtained based on a single parent plate. The comparison is made for constant elastic modulus and variable elastic modulus with plastic deformation increasing. The nonlinear implicit relationship between punch displacement and the unloaded angle is solved by the incremental numerical method. The experiment results of TWBs of the thickness ratio (0.586/0.9) and analytical prediction result agreed well with each other, so it is the foundation of the theory and experiment for TWBs' air bending process real-time control technology. © 2013 ICIC International.

关键词： Real time control

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The feedback control and simulation of a new chaotic system

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ICIC Express Letters 2013年第11期7卷 2927-2932页

作者： Liu, Wen Cui, Yanling Zhao, Jingyi Zhang, Hui College of science Yanshan University No. 438 Hebei Ave Qinhuangdao 066004 China Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education of China Yanshan University No. 438 Hebei Ave Qinhuangdao 066004 China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University No. 438 Hebei Ave Qinhuangdao 066004 China

In this paper, a new 3D autonomous chaotic system is presented. The chaotic behavior of the system, the stability at the equilibriums and control problems are discussed. Based on Lyapunov stability theory, utilizing the feedback control method, the linear and nonlinear feedback controllers are designed. Under the effective controllers, the sufficient condition of the unstable equilibrium is obtained. The theoretical analysis and simulation results are given to show the effectiveness of the method. © 2013 ISSN 1881-803X.

关键词： Feedback control

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Structural optimization and performance research on the piston pair of low speed high torque water hydraulic motor

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Meitan Xuebao/Journal of the China Coal Society 2013年第SUPPL.2期38卷 536-542页

作者： Wang, Zhi-Qiang Gao, Dian-Rong Huang, Yao Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao 066004 China Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education of China Yanshan University Qinhuangdao 066004 China

The aim of this paper was to find an optimal configuration to improve the static and dynamic characteristics of the piston pair. Based on the equilibrium equation and the flow equation, the mathematical models of the power loss and the dynamic characteristics were established. The total power loss, the velocity and the displacement of roll ball can be the performance indexes of the piston pair. Different size of the water film thickness has different performance indexes. So the influence of the water film thickness on the piston pair was analyzed in detail. An optimal model, with the minimum of the total power loss of the piston pair as optimization objective, was established, which refers to the hydrostatic bearing characteristics of piston pair. The parameters of piston pair were obtained by optimum design. When θ0 is 19°, the diameter of piston tail is 15 mm and the diameter of damper orifice is 0.18 mm, the optimum water film thickness of piston pair is 2.027 μm. The research shows that optimized piston pair has lower power loss, good lubricating performance, and higher static and dynamic performance.

关键词： Pistons

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Investigation on the Microstructures and Tensile Properties of TA15 Titanium Alloy Thick-Wall Parts Formed by Laser Rapid forming Process

Investigation on the Microstructures and Tensile Properties ...

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2012 International Conference on Advances in Materials science and Engineering(AMSE 2012)

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

TA15 titanium alloy thick-wall parts have been deposited by Laser rapid forming(LRF) *** this paper, a new overlap method between two adjacent laser tracks has been used to deposit the thick-wall titanium *** showed that the LRFed thick-wall titanium part was good in shape by using the new overlap *** microstructure of the LRFed titanium alloy primarily consists of columnar prior-beta grain, which is perpendicular to the substrate resulting from directionally *** also could be observed that the size of alpha phase increased with increasing laser power and decreasing scanning *** properties of LRFed titanium was slightly lower than that of the wrought annealed TA15 titanium alloy, after the heat-treatment of 940℃/1h/AC, the heat-treated titanium alloy showed good tensile properties which were equivalent to that of the wrought annealed TA15 titanium alloy.

关键词： Laser rapid forming TA15 titanium alloy Microstructure Tensile properties

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Simulation on the Transient Thermal Stress Field of the Wall-Shaped Part Deposited by Laser Direct Metal Powder Deposition

Simulation on the Transient Thermal Stress Field of the Wall...

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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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Combining gait research of the quadruped/biped reconfigurable walking chair with parallel leg mechanism

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4th International Conference on Social Robotics, ICSR 2012

作者： Hu, Xing Wang, Hongbo Sang, Lingfeng Gu, Qifang Yuan, Lin School of Mechanical and Electrical Engineering Xi'an University of Architecture and Technology Xi'an Shanxi 710055 China Ministry of Education Key Laboratory of Advanced Forging Technology and Science Hebei Province Key Laboratory of Parallel Robot and Mechatronics Systems Yanshan University Qinhuangdao Hebei 066004 China Department of Computer Wuxi City College of Vocational Technology Wuxi 214063 China

ISBN: (纸本)9783642341021

The quadruped/biped reconfigurable walking robot with parallel leg mechanism can realize not only the quadruped walking, but also the biped walking. The converting process from the quadruped to the biped includes locking the vertical revolute pair hinged with the upper platform and combining the corresponding lower platforms. Based on the previous study, the combining schemes of walking chair are researched in this paper, and then the correctness of the combining schemes is analyzed by using the position workspace of the swing leg and the body mechanism in different states which are obtained by the MATLAB software and anti-solution search method. Compared with the stability margin and the adjustment coordination of the body in the different combining schemes, the optimal combining gaits of walking chair are selected, which lays the theoretical foundation for the quadruped/biped converting control of walking chair. © 2012 Springer-Verlag.

关键词： MATLAB

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Structural Design and Simulation Optimization of New Type Telescoping Heavy Hydraulic Trailer Steering System

Structural Design and Simulation Optimization of New Type Te...

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The 16th International Conference on Fluid Dynamic and Mechanical & Electrical Control Engineering(FDMECE2012)

作者： Rui Guo Jingyi Zhao Yongchang Wang Decai Han Hebei Province key laboratory of heavy machinery fluid power transmission and control Ministry of education key laboratory of Advanced forging technology and science Environmental Management College of China

ISBN: (纸本)9783037855164

The length variability of telescoping heavy hydraulic trailer wills casue friction and sliding,increasing drag torque and power consumption of steering,moreover,and reducing the security and reliability of steering,so the new type follow-up steering system is designed and studied. In order to reduce the turning radius and tire wear,the adjustable steering wheel structure and double front axle mechanism are *** this basis,the theoretical analysis of the steering system is carried out,and the mathematical model is *** minimum error of actual and ideal angle is regarded as the optimization goal of pure rolling condition,and the simulation optimization and experimental research is *** results show that:the steering structural optimization is feasible, the performance is optimal on the condition that the actual and ideal angle valves of inside and outside wheels of each axis are approximately equal in turning process,and can reflect the advantage of new follow-up steering system in lowering power consumption,improving product life cycle and other areas.

关键词： telescoping heavy hydraulic trailer follow-up steering system steering error simulation optimization

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Study on the safety design of main arm mechanism in slag pot carrier

Study on the safety design of main arm mechanism in slag pot...

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The 16th International Conference on Fluid Dynamic and Mechanical & Electrical Control Engineering(FDMECE2012)

作者： Rui Guo Jingyi Zhao Decai Han Yongchang Wang Hebei Province key laboratory of heavy machinery fluid power transmission and control Ministry of education key laboratory of Advanced forging technology and science Environmental Management College of China

ISBN: (纸本)9783037855164

According to the new kind of the upper arm mechanism of the slag pot carrier,optimization design,simulation and experimental research are carried out,in which the combination of conventional design,three dimensional virtual design and experimental study are *** motion law of multi-segment arc slide way of main arm is given by means of researching the motion process of slag ladle in the main arm slide *** functional relationship among the internal parameters of the arm mechanism,and between load force and arm movement is revealed by studying kinematics of mechanism and dynamics law of the upper arm *** finite element analysis of the upper arm mechanism is carried out to get the weak links of structure strength,and then the improvement solution is *** experiments,the method correctness of optimization and design of upper arm mechanism is testified by the coincidence of the trial results and experimentation results.

关键词： slag pot carrier mechanism design Virtual technology Simulation and Optimization Experimental study

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