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Numerical simulation analysis and experimental research on multistage throttle orifice

ICIC Express Letters, Part B: Applications 2016年第11期7卷 2497-2504页

作者： Gao, Dianrong Yu, Meiqi Luo, Hongliang Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University Ministry of Education of China No. 438 Heibei Ave. Qinhuangdao066004 China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University No. 438 Heibei Ave. Qinhuangdao066004 China

Multistage orifice is widely used in large pipe transmission systems. In order to find the key factors which affect the energy dissipation, the orifice characteristics with different geometrical parameters were analyzed by numerical simulation and experiment. At first, numerical model of orifice was built. Then simulation results were got with different orifice thickness, distribution diameter and chamfering of orifice hole by Fluent. Finally, experiment was performed to verify the simulation which proved that the simulation results were correct and practical. © 2016 ICIC International.

关键词： Energy dissipation

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Research on algorithm of braking pressure estimating for anti-lock braking system of motorcycle

Research on algorithm of braking pressure estimating for ant...

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IEEE International Conference on Aircraft Utility Systems (AUS)

作者： Jing Yao Yang Zhang Juan Wang Ministry of Education of China Key Laboratory of Advanced Forging & Stamping Technology and Science Qinhuangdao Hebei Province Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao CO China School of Mechanical Engineering Yanshan University Qinhuangdao CO China

ISBN: (纸本)9781509010882

An effective pressure estimation algorithm of ABS for motorcycles was proposed in this paper to get the relatively accurate wheel cylinder pressure. Firstly, the performance characteristics of hydraulic control unit was studied and the vehicle model was established by using BikeSim. Next, the pressure estimation algorithms of master cylinder and wheel cylinder were studied. The estimated pressure is modified according to different vehicle braking stages. Finally, based on an actual motorcycle the wheel cylinder pressure was obtained under different pavements and braking initial speeds by ABS experimental platform to validate the effectiveness of wheel cylinder pressure estimation algorithm. The results show that the actual wheel cylinder pressure can be well tracked by the estimated wheel cylinder pressure with an allowable pressure error.

关键词： Wheels Motorcycles Force Estimation Mathematical model Valves Pistons

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Design and Research of New Large Flow Three-way Pressure Compensation Valve

Design and Research of New Large Flow Three-way Pressure Com...

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2016 IEEE/CSAA International Conference on Aircraft Utility Systems(AUS)

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 Huade Hydraulic Industrial Group Co Ltd 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 ChinaYanshan University

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 *** a new large flow pressure compensation valve was *** valve contains a main channel and two overflow *** 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 *** flow of new valve can reach 400 L/min and unloading pressure can reduce to ***,the new valve meets the requirements of LUDV multi-way valve under large flow *** new large flow three-way pressure compensation valve makes an important contribution to the further research on multi-way valve.

关键词： large flow pressure compensation valve LUDV multi-way valve unloading pressure

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A modified nls-dy conjugate gradient method

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ICIC Express Letters 2016年第12期10卷 2921-2925页

作者： Shan, Rui Qi, Changxia Zhao, Jingyi Xu, Yumin School of Science Yanshan University No. 438 Hebei Ave. Qinhuangdao066004 China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University No. 438 Hebei Ave. Qinhuangdao066004 China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University No. 438 Hebei Ave. Qinhuangdao066004 China

This paper proposes a modified NLS-DY conjugate gradient method with disturbance parameters. And under the strong Wolfe line search, the sufficient descent condition and the global convergence are established. At last, the results of numerical experiments demonstrate the effectiveness of the presented algorithm. © 2016 ICIC International.

关键词： Conjugate gradient method

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Design and Research of New Large Flow Three-way Pressure Compensation Valve

Design and Research of New Large Flow Three-way Pressure Com...

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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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Performance Analysis of a Constant Temperature Hydraulic Tank Cooling System based on Semiconductor Refrigeration technology

Performance Analysis of a Constant Temperature Hydraulic Tan...

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2015 International Conference on Fluid Power and Mechatronics

作者： Guo Rui Zhang Zhen-miao Zhao Jing-yi Ning Chao Li Bing-liang Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University)

The traditional oil cooling method is replaced by the semiconductor refrigeration technology, the design of a new type of semiconductor refrigeration system is applied to oil source temperature control. The mechanism of semiconductor refrigeration is analyzed, hot and cold end temperature difference of the device(Th-Tc) and the figure of merit of thermoelectric materials Z influence on the performance of semiconductor refrigeration system are analyzed theoretically, and then hydraulic tank semiconductor refrigeration system is established. The system is tested, the results show that the semiconductor refrigeration system can control the temperature at 37±1°C, when the environment temperature is 12°C and the initial oil temperature is 38°C, and it provides a new theoretical basis and engineering approach to solve the problem of the hydraulic oil temperature control.

关键词： semiconductor refrigeration the constant temperature tank mathematical model simulation analysis test verification

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