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IEEE International Conference on Aircraft Utility Systems

作者： Xiaodong Yang Xiaolong Zhao Chao Ai Gang Peng Zhimin Wang Jianpei Dou Xiaodong Wu Yuejun Li Beijing Huade Hydraulic Industrial Group Co. Ltd Beijing 101500 China Beijing Huade Hydraulic Industrial Group Co Ltd Beijing 101500 China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control as well as Key Laboratory of Advanced Forging & Stamping Technology and Science Ministry of Education of China Yanshan University Qinhuangdao 066004 China

ISBN: (纸本)9781509010882

In the hydraulic systems with fixed displacement pump, there is a problem that the flow of three-way pressure compensation valve working with LUDV multi-way valve is low. So a new large flow pressure compensation valve was designed. The valve contains a main channel and two overflow channels. Through bench test and field experiments, the new large flow three-way pressure compensated valve was verified with good unloading pressure characteristics and good pressure compensation characteristics in large flow working conditions. The flow of new valve can reach 400 L/min and unloading pressure can reduce to 3MPa. Thus, the new valve meets the requirements of LUDV multi-way valve under large flow condition. The new large flow three-way pressure compensation valve makes an important contribution to the further research on multi-way valve.

关键词： Valves Cavity resonators Springs Crawlers Cranes Oils VALVE GATE pressure compensation resonant cavities Crawlers Gruidae Cranes springs Device Spring oils

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Processing and simulation of thin-walled shell with inner ribs formed by inner spinning technology

Processing and simulation of thin-walled shell with inner ri...

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International Conference on Industrial, Mechanical and Manufacturing science, ICIMMS 2014

作者： Wang, Zhenjie Guo, Baofeng Ma, Shicheng Education Ministry Key Laboratory of Advanced Forging and Stamping Science and Technology College of Mechanical Engineering Yanshan University QinhuangdaoHebei China Special Material and Technic Institution of Aerospace Beijing China

ISBN: (纸本)9781138026568

The formation of a thin-walled shell structure with inner ribs by inner spinning technology was simulated using the finite element simulation softwareABAQUS. The spinning force and deformation condition were calculated and analyzed in this simulation. Results indicate that a thin-walled cylindrical shell with uniform deformation can be obtained using the inner spinning process with good forming effect. For all the regions, the radial load was found to be greater than the axial load, with the radial load in the range of 0–270 kN. The skin and the back frame sections experience load peaks, which is in the expansion capacity of −200mm for the skin section. The peak load in the rear frame section is stable in a 15mm stroke, which then gradually decreases to zero. The forming load in the front frame increases with the increase in the feed load of the spinning wheel, leading to the possibility of fracture in this region. The axial spinning load is rather small in the range of 0–47 kN. Based on the simulated values of these parameters, we demonstrated the formation of good quality 2A12 aluminum alloy products using the inner spinning technology. © 2015 Taylor & Francis Group, London.

关键词： Deformation

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Analysis of thin-walled shells with inner ribs formed by inner spinning technology

Analysis of thin-walled shells with inner ribs formed by inn...

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作者： Wang, Z. Ma, S. Education Ministry Key Laboratory of Advanced Forging and Stamping Science and Technology College of Mechanical Engineering Yanshan University Qinhuangdao Hebei066004 China Special Material and Technic Institution of Aerospace Beijing100074 China

This study analysed the formation of thin-walled shells with inner reinforcing ribs formed by conventional spinning technology through the design of three different blanks. Various factors and processing parameters, which affected the formation of the product, were studied. It was discovered that the spinning times were influenced by the expansion ratios and the inner ring reinforcing ribs. The impacts of spindle speed and spinning roller radius on the formation of the thin-walled shells with inner ribs were found to be identical. The specimens formed by the inner spinning technology exhibited two kinds of failure modes, which are described and explained. © W. S. Maney & Son Ltd 2015.

关键词： Shells (structures)

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Some mathematical aspects on walking robots stable evolution

Some mathematical aspects on walking robots stable evolution

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International Conference on Software, Knowledge Information, Industrial Management and Applications (SKIMA)

作者： Marcel Migdalovici Luige Vladareanu Gabriela Vladeanu Said Broumi Daniela Baran Florentin Smarandache Hongbo Wang Yonfei Feng Robotics and Mechatronics Department Romanian Academy Institute of Solid Mechanics Bucharest Romania Faculty of Science Ben M'Sik University Hassan II Casablanca Morocco Dynamical Systems National Institute of Aircraft Research “Elie Carafoli” Bucharest Romania Department of Mathematics University of New Mexico Gallup NM USA Parallel Robot and Mechatronic System Laboratory of Hebei Province Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao China

ISBN: (纸本)9781509032990

A survey of some author's concepts on the dynamic systems stability regions, in the general case of dynamic systems that depend on parameters is related in the paper. The property of separation of stable regions in the free parameters domain is assumed in the paper as an important property of the environment that is carry out and in the specified case of walking robot analyzed in the paper. The matrix that defines the linear dynamic system has the components of the matrix, assumed to be with real values, and the matrices that intervene in the exposure of the method are also, with real values of the components. We assumed that the matrices from the exposure have the complex values such that the real values are also taken into account as particular case of the complex values. This hypothesis assures a new method of analysis, in the complex domain, on the dynamic systems stability. Our theory on the stability control of the dynamic systems is applied here for specified walking robot model that depend on parameters. The critical position of the walking robot evolution is defined and analyzed on some cases of the walking robot leg, and possible application for robot walking up stairs is exposed. The further way of research is emphasized.

关键词： Legged locomotion Eigenvalues and eigenfunctions Matrices Heuristic algorithms Stability analysis Mathematical model

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Flow Stress Behaviors and Microstructure Evolution of 300M High Strength Steel under Isothermal Compression

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Journal of Iron and Steel Research International 2014年第12期21卷 1116-1123页

作者： Rong-sheng QI Bao-feng GUO Xin-gang LIU Miao JIN Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University) Ministry of Education of China

The compressive deformation behaviors of 300M high strength steel were investigated over a wide range of temperatures （850- 1200 C） and strain rates （0. 001- 10 s^- 1 ） on a Gleeble-3800 thermo-mechanical simulator. The measured flow stress was modified by the corrections of the friction and the temperature compensations, which nicely reflect negative effects of the friction and temperature on the flow stress. The corrected stress-strain curves were the dynamic recrystallization type on the conditions of higher deformation temperature and lower strain rate. Flow stress increases with the increase of strain rate at the same deformation temperature and strain. By contrast, flow stress decreases with the increase of temperature at the same strain rate and strain. Dependence of the peak stress on temperature and strain rate for 300M steel is described by means of the conventional hyperbolic sine equation. By re gression analysis, the activation energy （Q） in the whole range of deformation temperature is determined to be 367. 562 kJ/mol. The effects of the temperature and the strain rate on mierostructural evolution are obvious. With the increase of the deformation temperature and the decrease of the strain rate, the original austenite grain sizes of 300M steel increase. At the same time, the corrected flow stress curves more accurately determine the evolution of the microstrueture.

关键词： 300M high strength steel flow stress curve correction microstructural evolution

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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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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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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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