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Research on hydraulic wind turbine semi-physical simulation platform

High technology Letters 2015年第3期21卷 269-275页

作者：艾超 Chen Lijuan Kong Xiangdong Liao Lihui Chen Wenting Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Key Laboratory of Advanced Forging & Forming Technology and Science(Yanshan University) Ministry of Education School of Mechanical Engineering Yanshan University

According to a research on the 30kVA simulation experimental platform of hydraulic wind tur- bine, its basic structure, composition and operation principle are expounded in this paper. An in- verter motor is used to simulate the wind turbine, while a similarity calculation method is applied be- tween the small and large wind turbine. A fixed displacement pump-variable motor closed loop is used as the main transmission system, and a self-excited synchronous generator generates electricity through the grid connection. The experiment and simulation study on the speed and power control of the hydraulic wind turbine is conducted, based on the experimental platform, thus correctness and progressiveness of the experiment platform is further verified. The experimental platform study lays a foundation for further research on the characteristics of hydraulic wind turhln~

关键词： wind power generation hydraulic transmission simulation of experimental platform

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Type Synthesis of Two-Degrees-of-Freedom Rotational Parallel Mechanism with Two Continuous Rotational Axes

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Chinese Journal of Mechanical Engineering 2016年第4期29卷 694-702页

作者： XU Yundou ZHANG Dongsheng WANG Min YAO Jiantao ZHAO Yongsheng Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of National Education Yanshan University Library Yanshan University

The two-rotational-degrees-of-freedom（2R） parallel mechanism（PM） with two continuous rotational axes（CRAs） has a simple kinematic *** is therefore easy to implement trajectory planning,parameter calibration,and motion control,which allows for a variety of application ***,no systematic analysis on structural constraints of the 2R-PM with two CRAs has been performed,and there are only a few types of 2R-PM with two ***,a theory regarding the type synthesis of the 2R-PM with two CRAs is systematically ***,combining the theories of reciprocal screw and space geometry,the spatial arrangement relationships of the constraint forces applied to the moving platform by the branches are explored,which give the 2R-PM two *** different distributions of the constraint forces in each branch are also *** the basis of the obtained structural constraints of branches,and considering the geometric relationships of constraint forces in each branch,the appropriate kinematic chains are *** the reasonable configuration of branch kinematic chains corresponding to every structural constraint,a series of new 2R-PMs with two CRAs are finally obtained.

关键词： type synthesis continuous rotational axes two rotational degrees of freedom parallel mechanism constraint force

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Study on principles and characteristics of new type digital hydraulic transformation 8

Study on principles and characteristics of new type digital ...

引用

8th IEEE International Conference on Fluid Power and Mechatronics, FPM 2019

作者： Tao, Liu Yang, Zhao Renfu, Sun Weijian, Li Xinyu, Zhang Hebei Province Laboratory of Heavy Machinery Fluid Power Transmission and Control Qinhuangdao China Key Laboratory of Ministry of Education for Advanced Forging Press Forming Technology and Science Qinhuangdao China

ISBN: (纸本)9781728103112

The hydraulic transformer is usually composed of a pair of pump-motor units. When inlet pressure is stable, the outlet pressure can be controlled by changing the displacement ratio between the pump unit and motor unit. Theoretically, there is no throttling and overflow loss, so it attracts much attention in fluid transmission field. However, most of the existing hydraulic transformers are controlled by the displacement-varying mechanism, with slow response and small range of transformer ratio. Therefore, a new type of digital hydraulic transformer was proposed. The main body is a group of gear pump motor units, which are installed in coaxial direction, and the displacement ratios between these units is arranged according to 2n in every inlet and outlet of these gear pump motor units, there are digital switch valves to realize the digital control of pressure change. Using simulation software AMESIM, the conversion process of digital hydraulic transformer is simulated and analyzed, the characteristics of pressure, flow and transformation ratio are verified during the working process. The characteristics of transformer under constant voltage network were tested by building an experimental platform. By changing the pressure and load of constant voltage network, the working characteristics of digital hydraulic transformer under different working conditions are studied. The feasibility of the variable pressure principle is verified, and the energy saving characteristics of the digital hydraulic transformer are proved. © 2019 IEEE.

关键词： Energy conservation

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Application of Parallel Mechanism in Varistructured Quadruped/Biped Human-carrying Walking Chair Robot

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International Journal of Automation and computing 2013年第5期10卷 447-454页

作者： Ling-Feng Sang Hong-Bo Wang Dian-Fan Zhang Zhen-Hua Tian Fu-Hai Deng De-Lei Fang Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Science and Technology Research Institute Yanshan University

For the existing problems of walking chair robot such as simple function,lower bearing capacity and not walking in complex environment,a novel varistructured quadruped / biped human-carrying walking chair robot is *** proposed robot could be used as biped and quadruped walking chair *** the conversion of the walking chair robot from the quadruped to the biped or vice versa,6-UPS and 2-UPS＋UP（U,P and S are universal joint,the prismatic pair,and sphere joint,respectively） parallel mechanisms are selected as the leg mechanism of the biped walking robot and quadruped walking robot,*** the screw theory and theory of mechanism,the degrees of freedom of the leg mechanism and the body mechanism in diferent motion states are computed so as to meet the requirements of mechanism *** motion characteristics of the 2-UPS＋UP parallel mechanism which is the key part of the walking chair robot are ***,the workspace of the moving platform is drawn and the efect of the structural parameters on the workspace volume is ***,it is found that the volume of the workspace of the moving platform is bigger when the side length ratio and the vertex angle ratio of the fxed platform and the moving platform which are isosceles triangles are close to *** study provides a theoretical foundation for the prototype development.

关键词： Human-carrying walking chair robot parallel leg mechanism degree of freedom varistructure workspace kinematics

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Operation and Force Analysis of the Guide Wire in a Minimally Invasive Vascular Interventional Surgery Robot System

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Chinese Journal of Mechanical Engineering 2015年第2期28卷 249-257页

作者： YANG Xue WANG Hongbo SUN Li YU Hongnian Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University School of Mechanical Engineering University of Jinan Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Faculty of Science and Technology Bournemouth University

To develop a robot system for minimally invasive surgery is significant,however the existing minimally invasive surgery robots are not applicable in practical operations,due to their limited functioning and weaker perception.A novel wire feeder is proposed for minimally invasive vascular interventional *** is used for assisting surgeons in delivering a guide wire,balloon and stenting into a specific lesion *** contrasting those existing wire feeders,the motion methods for delivering and rotating the guide wire in blood vessel are described,and their mechanical realization is presented.A new resistant force detecting method is given in *** change of the resistance force can help the operator feel the block or embolism existing in front of the guide *** driving torque for rotating the guide wire is developed at different *** the CT reconstruction image and extracted vessel paths,the path equation of the blood vessel is *** the shapes of the guide wire outside the blood vessel,the whole bending equation of the guide wire is *** is a risk criterion in the delivering *** process can make operations safer and man-machine interaction more reliable.A novel surgery robot for feeding guide wire is designed,and a risk criterion for the system is given.

关键词： minimally invasive wire feeder force analysis moment of inertia risk criterion

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Finite element simulation and experimental test of the wear behavior for self-lubricating spherical plain bearings

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Friction 2018年第3期6卷 297-306页

作者： Yahong XUE Jigang CHEN Sumin GUO Qingliang MENG Junting LUO School of Mechanical Engineering Yanshan University Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing Yanshan University Education Ministry Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University

In this study, based on the classical Archard adhesion wear theory, a three-dimensional finite element model was established, with the aim of simulating the failure process of self-lubricating spherical plain bearings in the swinging wear condition. The results show that the self-lubricating spherical plain bearings go through two different stages during the wear process, namely, initial wear stage and stable wear stage. Because the large contact points wear out during the initial wear stage, the maximum contact pressure decreases as the test period increases. The relatively larger wear depth region shows elliptical distribution, and the maximum distribution appears in the central contact area. The wear depth reaches 0.974 mm after swinging 25,000 times. PTFE fibers, which possess a good friction performance but poor abrasion resistance, abundantly exist on the friction surfaces of the fabric liner. Consequently, the friction torque during the initial wear stage is slightly smaller than the friction torque during the stable wear stage; however, the wear rate during the initial wear stage is high. The reliability and effectiveness of the finite element model are verified by experiment. The developed finite element model can be used for the analysis of the wear mechanisms of bearings and the prediction of the service life of bearings.

关键词： spherical plain bearing wear mechanisms wear depth contact pressure simulation

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Kinetic analysis of austenite transformation for B1500HS high-strength steel during continuous heating

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International Journal of Minerals,Metallurgy and Materials 2020年第11期27卷 1508-1516页

作者： Mu-yu Li Dan Yao Liu Yang Hao-ran Wang Ying-ping Guan Key Laboratory of Advanced Forging&Stamping Technology and Science(Ministry of Education of China) Yanshan UniversityQinhuangdao 066004China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

The dilatometric curves of B1500HS high-strength steel at different heating rates were measured by a Gleeble-3800 thermal simulator and analyzed to investigate the effect of heating rate on *** show that the value of starting temperature and ending temperature of austenite transformation increase with the rise of heating rates,whereas the temperature interval of austenite formation *** kinetic equation of austenite transformation was solved using the Johnson–Mehl–Avrami model,and the related parameters of the equation were analyzed by the Kissinger *** those calculations,the activation energy of austenite transformation is 1.01×10^6 J/mol,and the values of kinetic parameters n and ln k0 are 0.63 and 103.03,*** relationship between the volume fraction of austenite and the heating time at different heating rates could be predicted using the kinetic *** predicted and experimental results were compared to verify the accuracy of the kinetic *** microstructure etched by different corrosive solutions was analyzed,and the reliability of kinetic equation was further verified from the microscopic perspective.

关键词： B1500HS high-strength steel dilatometric curve austenite transformation kinetic equation Johnson-Mehl-Avuami model

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Parameter calibration of anisotropic GTN model and forming limit for S600 aluminum alloy sheet

Engineering Research Express

引用

Engineering Research Express 2025年第2期7卷

作者： Chen, Xiaohua Wang, Zhanshan Zhang, Xuejian Dong, Guojiang Yang, Zhuoyun Yu, Shuang Wang, Yang Yang, Yiru Department of Mechanical and Electrical Engineering Suzhou Vocational Institute of Industrial Technology Suzhou 215104 China National-Local Joint Engineering Research Center for Advanced Manufacturing Forming Technology and Equipment Yanshan University Qinhuangdao 066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science Ministry of Education of China Yanshan University Qinhuangdao 066004 China

High strength aluminum alloy sheet has obvious anisotropic characteristics and negligible necking in plastic deformation, making its fracture judgment in forming process more difficult than other metals. Taking S600 aluminum alloy sheet as the research object, a coupling model of anisotropic yield criterion and micro-damage theory namely Yld2000-GTN model was established, and its VUMAT subroutine was embedded into ABAQUS software in this study. The proposed model can improve the accuracy of fracture prediction for high-strength aluminum alloy sheet during plastic deformation. Uniaxial tension test and shear test were used to adjust the anisotropic parameters in Yld2000-GTN model. Uniaxial tension test was also employed to adjust damage parameters in Yld2000-GTN model with a new proposed method named sectional type parameter identification method (STPIM) basing on response surface method (RSM) and objective function method (OFM). However, these damage parameters could not accurately simulate the Force-Stroke curves of other notched samples with the highest error up to 18.94%. To correct this error, the relationship between stress triaxiality and damage parameters was further investigated and used to modify damage parameters. Taking the modified parameters into simulation, the prediction error of Force-Stroke curve for all notched samples was reduced to less than 5%. Finally, the theoretical forming limit diagram (FLD) of S600 aluminum alloy sheet was established by the modified parameters, and its accuracy was verified by the bulging test with hemispherical punch. © 2025 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.

关键词： anisotropic yield criterion forming limit diagram micro-damage VUMAT subroutine Yld2000-GTN model

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Analysis of Vibration Characteristics of Electro-hydraulic Driven 3-UPS/S Parallel Stabilization Platform

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Chinese Journal of Mechanical Engineering 2024年第6期37卷 212-224页

作者： Xiaoming Yuan Weiqi Wang Haodong Pang Lijie Zhang Hebei Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Forging&Stamping Technology and Science Ministry of EducationYanshan UniversityQinhuangdao 066004China

With the development of fluid-power transmission and control technology,electro-hydraulic-driven technology can significantly improve the load-carrying capacity,stiffness,and control accuracy of stabilization ***,compared with mechanically driven platforms,the stiffness and damping of the fluid,as well as the coupling effect between the fluid and the structure need to be considered for electro-hydraulic-driven parallel stabilization platforms,making the modal and dynamic response characteristics of the mechanism more *** the aim of solving the aforementioned issues,we research the electro-hydraulic driven 3-UPS/S parallel stabilization platform considering the hinge ***,the characteristic vibration equation of the mechanism is established using the virtual work ***,the variation characteristics of the natural frequency and the vibration response according to the position of the mechanism are analyzed based on the dynamic ***,the correctness of the model is verified by a modal test and Runge-Kutta *** study provides a theoretical basis for the dynamic design of electrohydraulic-driven parallel mechanisms.

关键词： Electro-hydraulic driven 3-UPS/S parallel stabilization platform Kinetic equation Vibration mode Vibration response Modal test

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Evaluation on Configuration Stiffness of Overconstrained 2R1T Parallel Mechanisms

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Chinese Journal of Mechanical Engineering 2024年第3期37卷 62-82页

作者： Xuejian Ma Zhenghe Xu Yundou Xu Yu Wang Jiantao Yao Yongsheng Zhao Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of National Education Yanshan UniversityQinhuangdao 066004China

Currently,two rotations and one translation(2R1T)three-degree-of-freedom(DOF)parallel mechanisms(PMs)are widely applied in five-DOF hybrid machining ***,there is a lack of an effective method to evaluate the configuration stiffness of mechanisms during the mechanism design *** is a challenge to select appropriate 2R1T PMs with excellent stiffness performance during the design *** the operational status of 2R1T PMs,the bending and torsional stiffness are considered as indices to evaluate PMs'configuration ***,a specific method is proposed to calculate these stiffness ***,the various types of structural and driving stiffness for each branch are assessed and their specific values ***,a rigid-flexible coupled force model for the over-constrained 2R1T PM is established,and the proposed evaluation method is used to analyze the configuration stiffness of the five 2R1T PMs in the entire ***,the driving force and constraint force of each branch in the whole working space are calculated to further elucidate the stiffness evaluating results by using the proposed method *** obtained results demonstrate that the bending and torsional stiffness of the 2RPU/UPR/RPR mechanism along the x and y-directions are larger than the other four mechanisms.

关键词： Parallel mechanism Stiffness Over-constrained Three degrees of freedom

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