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Research Square 2021年

作者： Chen, Duan Zhao, Changcai Chen, Xiaoyi Li, Haoyang Zhang, Xin Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao Hebei066004 China College of Mechanical Engineering Yanshan University Qinhuangdao Hebei066004 China

Friction and lubrication are important parameters that affect the quality of sheet metal forming, excellent lubrication condition and less harmful friction can reduce local thinning of sheet metal, delay fracture and improve surface quality. Aiming at the poor friction conditions and difficult lubrication in the flange area during deep drawing, an active pressurized forced lubrication deep drawing(FLDD) process was proposed in this paper. A hydraulic system was employed to flush high pressure lubricating oil into the contact gap between die and sheet in the flange area. The high pressure hydrostatic oil film in the contact gap can reduce the real contact area and improve the lubrication condition effectively. The equipment is simple, the cost is low, and lubricating oil pressure can be measured and controlled. Under the conditions of 20kN, 35kN and 50kN blank holder force(BHF), FLDD test of box parts was carried out with 5MPa and 9MPa pressure water-based lubricating oil. The horizontal comparison experiment was conducted with common lubricating media such as polyethylene film(PE film), high-purity molybdenum disulfide particles, vegetable oil and water-based lubricating oil under the same process conditions. Lubrication effect was evaluated by obtaining test data. Test results illustrated that the lubrication effect of high-purity molybdenum disulfide particles was the best and that of vegetable oil was the worst. The lubrication effect of water-based mineral lubricant was significantly improved after pressurization. The maximum forming height was increased by 17.97%, the maximum forming force was reduced by 8.9%, the maximum wall thickness thinning rate was reduced by 7%, and the lubrication effect of 9MPa pressure was superior to that of 5MPa. Although there is still a certain shortfall with special lubricating media such as high-purity molybdenum disulfide, FLDD process has definite application value in improving production environment, pollution control and aut

关键词： Sulfur compounds

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Solution of suspension cylinder subject to cosine distribution pressure and normal stress on both ends

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ICIC Express Letters 2015年第5期9卷 1513-1517页

作者： Zhao, Jingyi Zhang, Chunhui Liu, Wen Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control No. 438 Hebei Ave Qinhuangdao China Key Laboratory of Advanced Forging and Stamping Technology and Science No. 438 Hebei Ave Qinhuangdao China Colloge of Science Yanshan University No. 438 Hebei Ave Qinhuangdao China

In this paper, a stress function which meets both the biharmonic equations and boundary conditions are constructed in the three-dimensional space. Furthermore, the solution of a suspension cylinder subject to cosine distribution pressure on its inner and outer surfaces and normal stress on both ends are deduced. When strain values of cylinder are recorded by static strain tester on suspension cylinder, the experimental results are in accordance with the theoretic calculation. The analytic solution paves the way for the mathematic building and solution of cylinder with randomly uneven pressure. © 2015 ICIC International

关键词： Cylinders (shapes)

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Prediction and experimental verification of springback control on tailor welded blanks of high strength steel air bending process

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ICIC Express Letters 2013年第10期7卷 2811-2816页

作者： Duan, Yongchuan Guan, Yingping Wu, Bin Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education of China Yanshan University No. 438 Hebei Ave Qinhuangdao 066004 China School of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology No. 100 Pingleyuan Chaoyang District Beijing 100022 China

The analytical springback prediction model of tailor welded blanks (TWBs) of high strength steel for air bending process is put forward;the forming process is divided into non-warp around condition and warp around condition respectively. At the air bending unloading phase, the interaction moment of the two parent blanks is introduced to the model, and then the unloaded angle is obtained based on a single parent plate. The comparison is made for constant elastic modulus and variable elastic modulus with plastic deformation increasing. The nonlinear implicit relationship between punch displacement and the unloaded angle is solved by the incremental numerical method. The experiment results of TWBs of the thickness ratio (0.586/0.9) and analytical prediction result agreed well with each other, so it is the foundation of the theory and experiment for TWBs' air bending process real-time control technology. © 2013 ICIC International.

关键词： Real time control

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Development and experimental study of a novel weak coupling parallel three-dimensional force sensor

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ICIC Express Letters, Part B: Applications 2016年第11期7卷 2435-2442页

作者： Zhao, Yanzhi Jiao, Leihao Weng, Dacheng Li, Yang Liu, Xiaoxiao Key Laboratory of Parallel Robot and Mechatronic System of Hebei Province Yanshan University No. 438 Hebei Ave. Qinhuangdao066004 China Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of Education of China Yanshan University No. 438 Hebei Ave. Qinhuangdao066004 China

In order to effectively reduce the effect of coupling, a novel mechanical decoupling parallel three-dimensional force sensor with the steel ball structure is designed and developed, and the static calibration of the sensor is carried out. The rolling friction is applied instead of sliding friction to the design of the mechanical decoupling parallel three-dimensional force sensor. The mathematic model of the sensor is established, and the force mapping relationship of the applied external force and the force of measuring branches of the sensor is derived based on the screw theory. The prototype of the mechanical decoupling parallel three-dimensional force sensor is developed, and the load calibration and data acquisition experiment system are developed, and the static calibration is performed. The calibration data are analyzed by using the least-squares method and the experimental result shows that the interference error is less than 0.45% and the measurement error of the sensor prototype is less than 0.6%, which indicate that the developed mechanical decoupling parallel three-dimensional force sensor possesses high measurement accuracy, and the result of the study lays the foundation of the application of the mechanical decoupling parallel three-dimensional force sensor. © 2016 ICIC International.

关键词： Least squares approximations

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Simulation Research on the Effect of Chatter Signal on Response Characteristics of Proportional Pressure Reducing Valve

Simulation Research on the Effect of Chatter Signal on Respo...

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The 2015 International Conference on Advances in Construction Machinery and Vehicle Engineering(ICACMVE’2015)

作者： Ai Chao Lin Jiacheng Kong Xiangdong Yan Guishan Xia Qingchao The Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University)Ministry of Education of China Yanshan University Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan UniversityYanshan University The State Key Laboratory of Fluid Power Transmission and Control Zhejiang University

Proportional pressure reducing valve is often used in multi-way valve as a pilot valve,which can provide hydraulic pressure proportional to a given electromagnetic *** improving pilot valve control performance of multi-way valve,the mechanism of friction flutter compensation was analysed based on the Stribeck model,a mathematical model of the valve was built by the Power Bond Graph theory and the effect of chatter signal on response characteristics of the valve was obtained through a dynamic digital simulation *** simulation shows that output pressure fluctuation of the valve can be divided into reference pressure fluctuation and superposition pressure *** dynamic response stage,the pressure fluctuation mainly bases on superposition pressure fluctuation with fluctuation frequency equal to 770 *** steady-state stage,the pressure fluctuation mainly bases on reference pressure *** frequency of output reference pressure fluctuation of the valve is in accordance with corresponding chatter signal and the amplitude increases linearly with the increase of chatter signal amplitude.

关键词： proportional pressure reducing valve chatter signal friction flutter compensation power bond graph pressure fluctuation response characteristics

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Online Prediction of Hydro-Pneumatic Tensioner System of Floating Platform Under Internal Waves

SSRN

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SSRN 2023年

作者： Wang, Jianwei Jin, Xiaofan Liu, Xuchu Liu, Pengfa Wang, Yuqing Cai, Wei Guo, Rui School of Mechanical Engineering Yanshan University Hebei Qinhuangdao066000 China Shaanxi Key Laboratory of Hydraulic Technology Shaanxi Xi’an710000 China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Hebei Qinhuangdao066000 China College of Mathematics and Information Science and Technology Hebei Normal University of Science and Technology Hebei Qinhuangdao066000 China

The hydro-pneumatic tensioner of the floating platform has a nonlinear motion response in the complex marine environment, so it is difficult to obtain accurate prediction results. To improve the prediction accuracy of platform tensioner system motion, this paper puts forward an online prediction method for hydraulic pneumatic tensioner system. The method considers two environmental factors (winds and waves) that affect the responses of the tensioner, and the prediction model is established as follows: Firstly, a large number of environmental sequences and motion responses are obtained through platform model tests, and the environmental factor sequence is decomposed by empirical mode decomposition (EMD) to reduce the non-stationarity of the environmental factor sequence. Secondly, kernel principal component analysis (KPCA) is used to extract the key influencing factors of the feature sequence, to eliminate the correlation and redundancy of the original sequence and reduce the dimension of model input. Finally, the long short-term memory (LSTM) neural network is used to model the dynamic time of multivariable characteristic sequence, and the movement of the tensioner system with or without internal wave is predicted and analyzed. The results show that the established EMD-KPCA-LSTM model has higher prediction accuracy than LSTM and EMD-LSTM models. © 2023, The Authors. All rights reserved.

关键词： Empirical mode decomposition

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Mechanism Design and Walking Stability Study of (2UPS-U) +R Series-Parallel Hybrid Bionic Wheel-Legged Quadruped Robot*

Mechanism Design and Walking Stability Study of (2UPS-U) +R ...

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IEEE International Conference on Robotics and Biomimetics

作者： Shanshan Li Hongbo Wang Dong Li Minghao Li Lianqing Li Yu Tian Jianye Niu Hebei Provincial Key Laboratory of Parallel Robot and Mechatronic System Yanshan University Qinhuangdao China Academy for Engineering & Technology Fudan University Shanghai China Hebei Provincial Key Laboratory of Parallel Robot and Mechatronic System and Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education of China Yanshan University Qinhuangdao China

In this paper, a bionic-based design of a series-parallel hybrid wheel-legged quadruped robot that can realize wheel-foot transformations is presented to achieve footed stable walking, and a method of measuring the static stability of the robot by the evaluation of the torque of the supporting leg rotor axis is proposed with the consideration of the robot's leg mass. Firstly, the whole robot position is solved; Secondly, the force on the robot during static walking is analyzed, and the stability of its static walking is also analyzed from the moment perspective; Finally, the stabilizing support region for static walking is solved, and the stabilizing support region for the robot in such a motion state is calculated. This paper provides high reference significance and value for the mechanism design and walking stability research of series-parallel hybrid wheel-legged quadruped robots.

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Solution of suspension cylinder subject to linear distribution pressure and different bending moment and shearing force on both ends

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ICIC Express Letters, Part B: Applications 2015年第6期6卷 1639-1644页

作者： Zhang, Chunhui Zhao, Jingyi Liu, Wen Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University No. 438 Hebei Ave Qinhuangdao China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University No. 438 Hebei Ave Qinhuangdao China Colloge of Science Yanshan University No. 438 Hebei Ave Qinhuangdao China

The suspension cylinder of a mining dump truck is usually stressed to deform and crack. In order to solve this problem so as to improve the service life and safety, the analytic solution meeting boundary conditions for internal surface of suspension cylinder subjected to linear distribution pressure and different bending moment and shearing force on both ends is deduced on the basis of structure of the cylinder and displacement functions. When strain values of cylinder are recorded by static strain tester on suspension cylinder, the experimental results are in accordance with the theoretic calculation. The study laid a foundation for the design and application of suspension cylinder. © 2015 ISSN.

关键词： Cylinders (shapes)

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Numerical simulation analysis and experimental research on multistage throttle orifice

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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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Molecular Dynamics Simulation Analysis of the Indentation Hardness of Nano-Twinned Ni

SSRN

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SSRN 2022年

作者： Zhang, Qin Zhou, Bingrao Wang, Wei Li, Rongbin Lv, Zhiqing Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao066004 China State Key Laboratory of Metastable Material Science and Technology Yanshan University Qinhuangdao066004 China Shanghai Engineering Research Center of Hot Manufacturing Shanghai Dianji University Shanghai200245 China

Molecular dynamics simulations were employed to perform the nanoindentation analysis of nanocrystalline nickel with different crystal structures (single-crystal, polycrystalline, and nano-twinned) and twin layer thicknesses under a spherical indenter. To understand the effects of crystal structure and twin spacing on nanoindentation responses, the crystal structure, dislocation, strain, indentation force, temperature, hardness, Young's modulus, and elastic recovery rate of the indentation region were analyzed. It was noticed that crystal structure and twin spacing had great influences on the mechanical properties and elastic recovery rate of the three types of nanocrystalline nickel. In the single-crystal structure, plastic deformation occurred mainly due to dislocations and slips. In the polycrystalline structure, plastic deformation occurred due to dislocation–grain boundary interactions, whereas in the nano-twinned structure, dislocation–grain boundary and dislocation–twin boundary interactions were the main reasons for plastic deformation. In the single-crystal structure, the hydrostatic pressure was distributed in a "V"-shape below the indenter. In the polycrystalline structure, atoms under the compressive stress were distributed below the indenter and at crystal boundaries. In the nano-twinned structure, atoms under the compressive stress were mainly distributed below the indenter. © 2022, The Authors. All rights reserved.

关键词： Nanoindentation

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