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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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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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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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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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An Approach of Power Allocation Scheme for Relay Communication Networks Based on Seller-Buyer Game

An Approach of Power Allocation Scheme for Relay Communicati...

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第三十四届中国控制会议

作者： Peng Zhang Zhixin Liu Ling Zhao Hongjiu Yang Xinbin Li Institute of Electrical Engineering Yanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University) Ministry of Education of China College of Mechanical Engineering Yanshan University

ISBN: (纸本)9781467374439

In this paper, a robust optimization problem is formulated for decode-and-forward relay network via game *** uncertainty of channel gain is considered to overcome the performance degradation in practical environment. In this study,a probability threshold method is used to suppress the channel fluctuation. Besides, a seller-buyer game is formulated to jointly consider the maximum utility of source node and relay node. To reduce the overhead information exchanging, a distributed iteration algorithm is applied. Numerical results show the effectiveness of the proposed schemes, and also present the robustness of the relay network. Moreover, the proposed game is proved to converge to the unique equilibrium point.

关键词： Relay network game theory robust optimization outage probability distributed algorithm

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Research on two kinds of servo control elements effect on highly integrated valve-controlled cylinder

Research on two kinds of servo control elements effect on hi...

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2015 International Conference on Fluid Power and Mechatronics

作者： BA Kaixian YU Bin CAO Yuan WANG Zitong KONG Xiangdong 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

The joint drive of quadruped robot, the highly integrated valve-controlled cylinder(HIVC), whose control performance could effect on the whole machine of the robot directly. In this paper, based on the structure principles of flow servo valve and pressure-flow servo valve, the mathematical models of above two kinds of servo valve are established to analyze their dynamical performance respectively. To ensure the accuracy of the analysis results, the flow gain of above two kinds of servo valve are unified, then using them for force close loop control of HIVC on the performance test platform of HIVC, the effects of step force and sinusoidal force on the force control performance of HIVC with different forward channel gain are tested, moreover, the force control performance of HIVC under different frequency position disturbance are tested. The test results indicates both flow servo valve and pressure-flow servo valve can realize force close loop control of HIVC, but by comparison, due to the load pressure which is existed in pressureflow servo valve power level spool equilibrium process, the output flow decrease sharply with load force increasing, which can lead the load force control performance of HIVC which consists of pressure-flow servo valve is inferior to those which consists of flow servo valve. All the research conclusions can provide a theoretical and experimental foundation for the selection of servo control element of HIVC.

关键词： Quadruped robot Highly integrated valvecontrolled cylinder Force control system Flow servo valve Pressure-flow servo valve

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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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Development of a Four Wheel Independent Drive and Four Wheel Independent Steer Electric Vehicle

Development of a Four Wheel Independent Drive and Four Wheel...

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International Conference on Intelligent System Design and Engineering Application (ISDEA)

作者： Yuqin Zhao Fan Feng Runsheng Zhang Key Laboratory of Advanced Forging & Stamping Technology Yanshan University Qinhuangdao Hebei China College of Vehicle and Energy Yanshan University Qinhuangdao Hebei China

A four wheel independent driving four wheel independent steering electric vehicle was developed. Chassis assembly and electrical system assembly about the vehicle are made thorough introduction of in this paper. Identity power control module is taken as the driving control approach, and both feedforward control keeping sideslip angle zero and feedback control aiming at tracking the ideal model are used as steering control approach. Experiment in various conditions is made to testify the electric vehicle's driving characteristic, handling and stability, and control accuracy. The development of electric vehicle lies a foundation for further systematic study of vehicle dynamics.

关键词： Wheels Electric vehicles AC motors Permanent magnet motors Stability analysis Force

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The energy saving factor research of secondary regulation system of cement coating machine

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ICIC Express Letters, Part B: Applications 2015年第11期6卷 3077-3084页

作者： Kong, Xiangdong Luo, Hongliang Ai, Chao He, Long Dong, Yanwu Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education of China No. 438 Hebei Avenue Qinhuangdao China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University No. 438 Hebei Avenue Qinhuangdao China

The cement coating machine is widely used, but it wastes a lot of energy when braking. In order to overcome the weakness, secondary regulation system is put forward to recycle energy. Firstly the secondary regulation speed control system is proposed. Then the mathematical model of hydraulic secondary regulation system is established, and efficiency calculation method is derived. At last, through the simulation analysis and experimental verification, the feasibility of energy saving project is proved. With bigger slope and lower hydraulic pressure, the system can recycle more energy. © 2015 ICIC International.

关键词： Energy conservation

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