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SSRN 2024年

作者： Zhang, Biao Feng, Kangkang Shen, Xiaolong Yi, Yali Jin, Herong School of Mechanical Engineering Yanshan University Qinhuangdao066004 China Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of National Education Yanshan University Qinhuangdao066004 China

The impact of dual and triple-layer composite interlayer (CI), constructed from Fe, Co, and Ni foils, on the microstructure and mechanical properties of the interface of EH40/2205 clad plates was investigated. The findings indicated that all groups of CI had achieved metallurgical bonding between EH40 and 2205. Specifically, the Ni layer, which had been positioned close to the composite layer 2205, had hindered the diffusion of Ni and Cr, enhancing the plasticity of the clad plate. The Fe layer, situated between Ni and Co, had increased the hardness of the CI by 180~190HV through solid solution strengthening. The Co layer, located near the base layer EH40, had been approximately 70HV harder than the Ni layer, increasing the ultimate tensile strength (UTS) and ultimate shear strength (USS) of the clad plate by about 20%. Among the schemes, EH40/Co/Fe/Ni/2205 had been the preferred option, with a UTS of 549MPa and a USS of 704MPa. © 2024, The Authors. All rights reserved.

关键词： Microstructure

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Joint power control and interference management in two-tier CDMA femtocell networks for multi-agent systems

Joint power control and interference management in two-tier ...

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第三十三届中国控制会议

作者： Lili Hao Juhai Ma Ling Zhao Hongjiu Yang Zhixin Liu Institute of Electrical Engineering Yanshan University Hebei Province Key Laboratory of Heveay Machinery Fluid Power Transmission and Control College of Mechanical EngineeringYanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University) Ministry of Education of China College of Mechanical EngineeringYanshan University

ISBN: (纸本)9781479947249

As energy saving and environmental protection become an inevitable trend,this paper studied the problem of the efficient resource allocation via power control and interference management approaches for multi-agents in two-tier femtocell *** this paper,a distributed power control algorithm is proposed to investigate the resource allocation using hierarchical game for two-tier femtocell *** the algorithm,the protection of higher-priority multi-agents’uplink communication and the optimal power allocation for lower-priority multi-agents are simultaneously *** manage the cross-tier interference and suppress the near-far effect in the code-division multiple access system,an adaptive pricing scheme is *** example is given to illustrate the effectiveness of the developed algorithms.

关键词： Multi-agent Femtocell Resource allocation Hierarchical game Adaptive pricing.

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Robust power control for femtocell networks based on chance-constrained linear programs

Robust power control for femtocell networks based on chance-...

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第三十四届中国控制会议

作者： Peng Zhang Ling Zhao Zhixin Liu Hongjiu Yang Xinbin Li Institute of Electrical Engineering Yanshan University Hebei Province Key Laboratory of Heveay Machinery Fluid Power Transmission and Control College of Mechanical 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, we study the power control for two-tier network system which is comprised of a central macrocell and several femtocells. We are aiming at minimizing total power of the macrocell users and femtocell users considering that the signal-to-interference-plus-noise ratios(SINRs) of the macrocell user and femtocell users are subject to probability constraints and that the uncertainty of the channel gains is of stochastic nature. To solve the chance-constrained optimization problem, we propose a novel method which adopts distributionally robust chance-constrained linear programming. The method changes the chance-constrained optimization problem into a quadratic programming with quadratic constraints. Then, a branch and bound approach is adopted to solve it. Finally, numerical results are given to illustrate the performance with the scheme of power control.

关键词： Femtocell probability constraints quadratic programming quadratic constraints

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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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Higher-Order Kinematics Modeling of 3-RRS Parallel Mechanism Based on CGA

Research Square

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Research Square 2020年

作者： Wang, Chang Zhao, Tie-Shi Li, Er-Wei Zhao, Yan-Zhi Bian, Hui Geng, Ming-Chao Parallel Robot and Mechatronic System Laboratory Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of National Education Yanshan University Qinhuangdao066004 China School of Mechanical Engineering Hebei University of Architecture Zhangjiakou075000 China

Higher-order kinematics of mechanisms has been applied in servo motor control, human-robot interaction and machinery life design fields, etc. The representations of acceleration and jerk by screws have been fully developed by researchers with the methods of the differential of the matrix representation of SE(3) group. Clifford algebra, which is tighter and with higher computational efficiency than the matrix method, is another representation of the motions of rigid bodies. It has been used in position kinematics, grub task motion planning, and robot vision for its convenience of geometric representations and calculations. As far as we know, the work of higher-order kinematics of mechanisms based on Clifford algebra is rare. First, after recalling the based theory of motion representation in conformal geometric algebra (CGA), the mathematical relationships between flag and motor are built. Second, a method for the higher-order kinematics modeling of serial chain mechanisms is proposed. Finally, the higher-order kinematics of the 3-RRS parallel mechanism is built to prove the correctness of the algorithm. This work further enriches the application of CGA for the higher-order kinematics modeling of parallel mechanisms. © 2020, CC BY.

关键词： Kinematics

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Thesis on combination stock forecasting model with wavelet denoising and optimized arima method

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ICIC Express Letters 2014年第8期8卷 2315-2320页

作者： Shan, Rui Shi, Sutong Liu, Wen Zhao, Jingyi School of Science No. 438 Hebei Ave. Qinhuangdao 066004 China Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education of China No. 438 Hebei Ave. Qinhuangdao 066004 China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University No. 438 Hebei Ave. Qinhuangdao 066004 China

Stock market prediction is utility important in the economic system. With the rapid development of economy, stock data is becoming increasingly complex. This paper presents a new method using the principles of wavelet transform and wavelet denoising to de-noise the stock data, and then the improved Auto-Regressive Integrated Moving Average (ARIMA) model is used to predict the future trends of stock data. The presented model is compared with some other classical forecasting methods such as ARIMA model method, BP model method and the method proposed by Dai. The results tested with data indicate: this forecasting method introduced in this paper can realize multi-step prediction and the forecasting accuracy is higher than that of stock data which is predicted by the ARIMA model or the other forecasting model. © 2014 ICIC International.

关键词： Conjugate gradient method

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The feedback control and simulation of a new chaotic system

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ICIC Express Letters 2013年第11期7卷 2927-2932页

作者： Liu, Wen Cui, Yanling Zhao, Jingyi Zhang, Hui College of science Yanshan University No. 438 Hebei Ave Qinhuangdao 066004 China Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education of China Yanshan University No. 438 Hebei Ave Qinhuangdao 066004 China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University No. 438 Hebei Ave Qinhuangdao 066004 China

In this paper, a new 3D autonomous chaotic system is presented. The chaotic behavior of the system, the stability at the equilibriums and control problems are discussed. Based on Lyapunov stability theory, utilizing the feedback control method, the linear and nonlinear feedback controllers are designed. Under the effective controllers, the sufficient condition of the unstable equilibrium is obtained. The theoretical analysis and simulation results are given to show the effectiveness of the method. © 2013 ISSN 1881-803X.

关键词： Feedback control

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Fatigue Analysis of Sub-frame Based on Load Spectrum Extrapolation

Research Square

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Research Square 2020年

作者： Dong, Guo-Jiang Du, Fei Wei, Liu-Wei Han, Jie Hebei Key Laboratory of Special Carrier Equipment Yanshan University Hebei Qinhuangdao066044 China Key Laboratory of Advanced Forging Forming Technology Science Ministry of Education Hebei Qinhuangdao066044 China

The extrapolation of the whole life load spectrum from the strengthened road load spectrum in the test site is the key factor for the accuracy of the fatigue durability evaluation of automobile components. In this paper, aiming at the limitation of parameter method extrapolation single distribution estimation, the non parametric extrapolation estimation is introduced to describe the comprehensive characteristics of the load spectrum distribution, and the two extrapolation methods are compared parametrically, and the optimal fitting extrapolation spectrum is selected to carry out the fatigue damage analysis of the sub-frame. Based on the real vehicle test in the proving ground strengthened road, the stress spectrum of the dangerous point of the sub-frame is extracted by co-simulation of multi-body dynamics and finite element method. The parametric method and non-parametric method are used to calculate the goodness of fit of stress spectrum, the optimal mean value and amplitude value probability density of stress spectrum are selected according to the goodness of fit, and the stress spectrum cycle was extrapolated to 106 times, and then the stress spectrum was divided into eight levels. According to Miner criterion, Haibach and NASA S-N curve correction models considering small load damage were respectively used to estimate fatigue damage of front sub-frame. The results show that the fitting effect of non-parametric extrapolation is better than that of parametric extrapolation, and the goodness of fit of equivalent amplitude is 98.6%, which improves the description accuracy of stress spectrum distribution characteristics and provides more accurate extrapolation spectrum for fatigue durability evaluation of components. Based on the extrapolated spectrum and using Haibach model and NASA model to study the fatigue damage of sub-frame, it is shown that NASA model is more suitable for reliability design of components, while Haibach model is suitable for lightweight design

关键词： NASA

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Positioning control of a one-DOF manipulator driven by pneumatic artificial muscles based on active disturbance rejection control

Positioning control of a one-DOF manipulator driven by pneum...

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第三十四届中国控制会议

作者： Ling Zhao Qi Li Hongjiu Yang Hongbo Li Hebei Province 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 College of Mechanical EngineeringYanshan University College of Mechanical Engineering Yanshan University Institute of Electrical Engineering Yanshan University Department of Computer Science and Technology Tsinghua University

The purpose of this paper is to study positioning control performance of the one-DOF manipulator driven by pneumatic artificial muscles using active disturbance rejection controller. Owing to the pneumatic artificial muscle's highly nonlinear and time-varying behavior, it is difficult to achieve good positioning performance. In this paper, the nonlinear and time-varying behavior of pneumatic artificial muscle is considered as disturbance to be estimated by extended state observer. Tracking differentiator is designed to get corresponding smooth signal and differential signal of reference input to avoid overshoot. A linear error feedback combining with estimated value compensation of disturbance is designed to ensure a good response of system. Moreover, stability analysis of the close-loop system is given by Lyapunov theory. Finally, simulation results verify the effectiveness of the proposed controller.

关键词： Active disturbance rejection control,positioning control,pneumatic artificial muscle,disturbance estimation

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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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