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2015 International Conference on Fluid Power and Mechatronics

作者： Yuan Xiaoming Wang Chao Wang Junbo Ma Lei Zhang Lijie Hebei Key Laboratory of Heavy Mechinery Fluid Power Transimission and Control Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan university)Yanshan university

The MATLAB/Simulink simulation model of hydraulic turbine generator under 100% load rejection is established. The hydraulic turbine generator with the condition of load disturbance and 100% load rejection under fuzzy PID and PID control is simulated, and the changes of the speed, guide vane and water torque in hydraulic turbine generator are obtained. The advantages and disadvantages of the two control methods are compared, which provides references for the practical application of fuzzy PID control.

关键词： Speed regulating system of hydraulic turbine generator fuzzy PID control MATLAB/Simulink simulation model 100% load rejection

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Matching Analysis of Pilot Valve and Multi-way Valve for a Type of Bulldozer

Matching Analysis of Pilot Valve and Multi-way Valve for a T...

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2015 International Conference on Fluid Power and Mechatronics

作者： Wang Lihang Hu Shuwei Yang Lele Zhang Lijie Hebei Key Laboratory of Heavy Mechinery Fluid Power Transimission and Control Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan university)Yanshan university

The matching of the pilot valve and multi-way valve is a prerequisite for the pilot control in the engineering machinery. Based on hydraulic pilot control system of a certain bulldozer actuator and the principle of the pilot control system, we analyze the matching relationship between the pilot valve and multi-way valve. The parameters that influence the hydraulic pilot control system are summarized and the simulation model of pilot control system is built according to the actual parameters of components. The matching relationship of the hydraulic pilot control system is researched by experiments and simulation, which will provide theoretical guidance for the design of the pilot valve and multi-way valve that used in the engineering machinery.

关键词： pilot valve multi-way valve matching simulation

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Characteristics of Precipitation in an As-cast Nb-and V-containing High Nitrogen CrMn Austenitic Steel

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Journal of Iron and Steel Research International 2014年第10期21卷 945-950页

作者： Zhong-ping SHI Zhen-hua WANG Shu-hua SUN Ze-an ZHOU Ying-ping GUAN Wan-tang FU State Key Laboratory of Metastable Materials Science and Technology Yanshan University Key Laboratory of Advanced Forging and Stamping Technology and Science(Yanshan University) Ministry of Education of China

The phase diagram of an Nb- and V-containing 18Mnl8Cr0.5N steel was investigated using thermodynam ic calculation. The compositions and characteristics of precipitates were investigated by scanning electron microsco- py, energy dispersive spectrometry, X-ray diffraction, and differential scanning calorimetry. Under equilibrium con- ditions, MX precipitates at 1 350 ℃. MX is a substitutional solid solution of Nb4 N3.38, and its composition （at. %） is approximately.. Nb 40, N 40, V 8, and Fe, Cr, and Mn balance. The precipitates, with shapes including irregular bulk, rod, and ellipsoid, are primarily distributed at grain boundaries and triple junctions, and their size is approxi- mately 5 10 μm. Finally, the microalloying of high nitrogen CrMn austenite steels, control of precipitate size, and the effect of precipitate on hot formin~ were discussed.

关键词： high nitrogen steel microalloying precipitate

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Kinetostatics Analysis of a Novel 6-DOF Parallel Manipulator with Three Planar Limbs and Equipped with Three Fingers

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Chinese Journal of Mechanical Engineering 2014年第5期27卷 919-927页

作者： LU Yi LI Xuepeng College of Mechanical Engineering Yanshan University Key Laboratory of Parallel Robot and Mechatronic System of Hebei Province Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of National Education

It is significant to develop a robot hand with high rigidity by a 6-DOF parallel manipulator（PM）.However,the existing6-DOF PMs include spherical joint which has less capability of pulling force bearing,less rotation range and lower precision under alternately heavy loads.A novel 6-DOF PM with three planar limbs and equipped with three fingers is proposed and its kinematics and statics are analyzed systematically.A 3-dimension simulation mechanism of the proposed manipulator is constructed and its structure characteristics is *** kinematics formulae for solving the displacement,velocity,acceleration of the platform,the active legs and the fingers are *** statics formulae are derived for solving the active forces of PM and the finger *** analytic example is given for solving the kinematics and statics of proposed manipulator and the analytic solved results are verified by the simulation *** is proved from the error analysis of analytic solutions and simulation solutions that the derived analytic formulae are correct and provide the theoretical and technical foundations for its manufacturing,control and application.

关键词： parallel manipulator planar limbs finger kinematics statics

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Research on Multi-fault Identification Method of Axial Piston Pump Based on Correlation Dimension

Research on Multi-fault Identification Method of Axial Pisto...

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2015 International Conference on Fluid Power and Mechatronics

作者： LIU Siyuan YANG Mengxue ZHANG Wenwen Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University) Ministry of Education of China Yanshan University

Aiming at the problem of multi-fault identification method of axial piston pump, a new method combining correlation dimension and support vector machine was ***, the envelope demodulation was performed to several typical fault vibration signals of pump by using wavelet packet decomposition and Hilbert transform method. Then, the useful signals corresponding to feature band were obtained. Secondly,using the embedded dimension as characteristic attribute, the correlation dimension feature information of the useful signals was extracted by correlation dimension analysis method. At the same time, the feature sample set consists of the correlation dimension feature information and the energy feature information was built. Finally, the feature sample set was utilized as input, and the multi-fault modes of the axial piston pump were identified by support vector machine. Moreover, the experiments were respectively performed to the pump including slipper wear, loose slipper failure and central spring failure. The results confirmed that the fault recognition accuracy of SVM can be improved, and the faults can be effectively identified.

关键词： multi-fault identification axial piston pump envelope demodulation correlation dimension support vector machine

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Fault Diagnosis Method for Hydraulic Pump Based on Order Tracking

Fault Diagnosis Method for Hydraulic Pump Based on Order Tra...

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2015 International Conference on Fluid Power and Mechatronics

作者： Wanlu Jiang Yong Zhu Meng Wang Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University)Ministry of Education of China

Aiming at the problem of extracting fault features from hydraulic pump under variable rotating speed, a fault diagnosis method based on order tracking was proposed. Firstly, the original signal was decomposed by ensemble empirical mode decomposition into a series of intrinsic mode function(IMF) components. Afterwards, the fault sensitive IMF was selected by combining energy spectrum and spectral kurtosis. Secondly, the selected IMF was processed by Hilbert demodulation and downsampling. Moreover, an appropriate frequency band was chosen and the signal was further processed by wavelet cluster-based bandpass filtering. Then, the fault sensitive envelope signal was obtained. Thirdly, the instantaneous frequency was extracted from the envelop signal by wavelet ridge tracking, and the time instant of phase discrimination was further calculated. Moreover, the even angle spaced resample was performed to the envelope signal. Then, the time domain non-stationary signal was transformed to the angular domain stationary signal. Finally, the stationary signal was analyzed by order tracking, and the fault diagnosis was executed according to the order spectrum. Furthermore, an application was performed to the vibration signals of hydraulic pump under variable rotating speed. The signals were respectively acquired in four typical states, which were normal, loose slipper, slipper wear and swash plate wear. Results indicate that the proposed method can effectively extract the fault features of hydraulic pump and further realize fault diagnosis.

关键词： hydraulic pump fault diagnosis order tracking variable rotating speed

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Fatigue Analysis of the Cylinder in The Axial Piston Pump

Fatigue Analysis of the Cylinder in The Axial Piston Pump

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2015 International Conference on Fluid Power and Mechatronics

作者： Quan Ling-xiao Cao Yuan Luo Hong-liang Guo Rui Guo Haixin School of Mechanical Engineering Yanshan University The State Key Laboratory of Fluid Power Transmission and Control Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University) Ministry of Education of China

For the cylinder of the axial piston pump suffers complicated forces including hydraulic pressure force, mechanical forces and mutual coupling, which causes the cylinder fatigue damage with all forces whose fluctuation is caused by fluid striking on the cylinder of the pump cyclically, it is necessary to develop the fatigue analysis research. And the sensitive fatigue areas of the cylinder in the axial piston pump is presented through the nephogram of the fatigue life, the fatigue safety factor over the whole model and the curve of fatigue sensitivity, which can verify the theory of micro crack propagation and the transient dynamics analysis of the axial piston pump cylinder is simulated. All the results are produced by software, Solidworks is used to build the three-dimension assembling model containing seven pistons and ANSYS Workbench is used to manage the model through setting the parameters of different materials and constrains of the cylinder. It's promising to provide a theoretical basis when optimizing the design of the axial piston pump and to offer new ideas and methods for the study of reliability and fatigue durability on the axial piston pump.

关键词： Axial piston pump Cylinder Transient dynamics simulation Fatigue simulation

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Research on Parallel Energy-saving Reliability Test Method for Hydraulic Components

Research on Parallel Energy-saving Reliability Test Method f...

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2015 International Conference on Fluid Power and Mechatronics

作者： Liwang Wei Yi Zhang Rui Guo Jingyi Zhao School of Mechanical Engineering Yanshan University Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University) Ministry of Education of China

The traditional reliability test of hydraulic components is time-consuming and low efficiency with high energy consumption, so we propose a novel parallel energysaving reliability test method to improve the performance. By increasing the sample type and sample size of the single reliability test, the test time can be shortened and the energy can be recycled for many times. The design considerations of the parallel reliability test device are summarized at the end of the article. The experiment results indicate that the test time and the power loss of the parallel energy-saving reliability test device are greatly decreased, and it has large application value.

关键词： hydraulic components,parallel energy-saving,reliability test,recycle

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Study of ADRC on Fluid Power Transmission System Control Characteristics of 60MN Hydraulic Press

Study of ADRC on Fluid Power Transmission System Control Cha...

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2015 International Conference on Fluid Power and Mechatronics

作者： FENG Jingchang YU Bin LI Xuebing YAO Jing KONG Xiangdong GUO Haixin School of Mechanical Engineering Yanshan University Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University) Ministry of Education of China

Heavy forgings quality and production capacity represent an important symbol of the level of the country's industrial development. Large water press is the equipment for heavy forgings forming, and it's essential to improve the control performance of power transmission system. In this paper, the mathematical models of the key elements for fluid power transmission system, including water pump, accumulator, inlet valve, outlet valve, main distributor, prefill valve, pipeline, actuator, load, working medium, electro-hydraulic servo system, are established, and the complete mathematical model of fluid power transmission system is derived. Based on the mathematical model of electro-hydraulic position servo control system of hydraulic press, the load characteristics of the electro-hydraulic position servo control system are analyzed, the strategy of active disturbance rejection control(ADRC) is derived, the principle of selecting the control parameters is obtained. Furthermore, the effect of ADRC control and PI control of hydraulic press is analyzed under no load, step, sinusoidal and ramp disturbance force respectively. The results show that: compared to the PI control, the ADRC can make distributor more rapid and sensitive, and improve the control performance and anti-disturbance capability of electro-hydraulic servo system of hydraulic press, and improve the overall response speed and compensate the position control accuracy under the lowfrequency disturbances. Above research work can provide theoretical and experimental basis for studying on control method of fluid power transmission system of 60 MN hydraulic press.

关键词： Hydraulic press Fluid power transmission system Electro-hydraulic servo system Main distributor Active disturbance rejection control

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Active disturbance rejection trajectory tracking control for two-joint driven by pneumatic artificial muscles

Active disturbance rejection trajectory tracking control for...

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International Conference on Fluid Power and Mechatronics (FPM)

作者： Ling Zhao Linlin Ge Yafei Yang Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University) Ministry of Education of China Qinhuangdao China School of Electrical Engineering Yanshan University Qinhuangdao China

ISBN: (纸本)9781479987719

Active disturbance rejection control is proposed to study the problems on trajectory tracking and decoupling for a two-joint system driven by pneumatic artificial muscles. Because of coupling and nonlinearity, it is very hard to obtain good performance in trajectory tracking for the two-joint system. The active disturbance rejection nonlinear controller includes a tracking differentiator, an extended state observer and a nonlinear error feedback controller. The tracking differentiator is introduced to arrange a transitional process to track input signal and get differential signal. The extended state observer is designed to estimate the non-linearity of system. The nonlinear error feedback controller is designed to improve the performance of system. Simulation results are given to show the effectiveness of proposed controller in this paper.

关键词： Muscles Observers Control systems Simulation Robust control Mathematical model

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