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第二届计算智能、工程与技术国际研讨会

作者： Hongbo Wang Musong Lin Yonggan Yan Guowei Liu Bowen Su Chaosheng Zhao Fuhao Wang Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Academy for Engineering & Technology Fudan University Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University

This paper proposes a new hybrid(parallel–serial) 6-DOF lower limb rehabilitation robot including two mechanical legs and an adjustable seat, which could train in sitting, lying and standing three postures. Each mechanical leg consists of hip joint, knee joint and ankle joint. The dynamics and DOF of the robot are analysed, and the result is verified by the software ADAMS. The result lay the foundation for prototype build in future.

关键词： DOF Dynamics analysis and simulation of a new 6-DOF lower limb rehabilitation robot simulation

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The study and engineering application on adaptive leveling of vehicle platform 7

The study and engineering application on adaptive leveling o...

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7th International Conference on Advances in Construction Machinery and Vehicle Engineering, ICACMVE 2019

作者： Wang, Jianjun Zhao, Jingyi Li, Wenlei Cai, Wei Wang, Yongchang Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qmhuangdao Hebei066004 China Department of Mechanical Engineering Anhm Technical College of Mechanical and Electrical Engineering Wuhu Anhui241002 China Key Laboratory of Advanced Forging & Stamping Technology and Science Qmhuangdao Hebei066004 China College of Mechanical Engineering Yanshan University Qmhuangdao Hebei066004 China Hebei Key Laboratory of Special Delivery Equipment Qmhuangdao Hebei066004 China

ISBN: (纸本)9781728139050

Leveling control of bearing platform of large engineering transport vehicle is very important for the safety and reliability of transportation. The leveling method of the load-bearing platform of the transporter is studied. According to the actual working conditions, through the force analysis of the load-bearing platform and the calculation method of the load center of gravity, the allowable loading area for the anti-overturning of the engineering transporter under the condition of four-point support is put forward. An adaptive electro-hydraulic leveling system based on four-point support is designed, and four groups of suspension hydraulic system are simplified as a single-support system model. The hydraulic system is built by AMESim software, and the control system is built by MATLAB software, Then the feasibility of the leveling control system is verified through the simulation. The results show that the control strategy has better precision and shorter reaction time, and is more suitable for vehicle leveling control system. On this basis, And the electro-hydraulic leveling control system was designed for the 100 tons of hydraulic truck of an enterprise, double-axis tilt sensor is used to monitor the level of the platform in real time, and the controller can make the suspension hydraulic cylinders act accordingly to keep the platform level. Finally, the actual vehicle leveling experiment is carried out, and the experiments of load sharing and unbalanced load lifting are carried out respectively. It is found that the leveling accuracy can be controlled within 0.25 degrees, which fully meets the engineering application and can provide reference for the development of similar systems. © 2019 IEEE.

关键词： MATLAB

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Unveiling the Inhomogeneous Deformation Behavior of Mg-Gd-Y-Zn-Zr Alloy with Unique Featured Intragranular Lamellar Lpso Phase

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SSRN 2024年

作者： Meng, Dawei Xu, Yan Jia, Jianbo Luo, Junting Xu, Bo Education Ministry Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University Qinhuangdao066004 China School of Mechanical Engineering Yanshan University Qinhuangdao066004 China

A Mg-6.22Gd-3.04Y-0.49Zn-0.41Zr alloy with an exclusive microstructure featuring only an intragranular lamellar long-period stacking ordered (LPSO) phase was developed via specific homogeneous and cooling techniques. The effect of LPSO phases with varying lamellar orientations on the formation of bimodal structures and the inhomogeneous nucleation mechanisms was explored using uniaxial compression tests. Microstructural analyses revealed that compressed alloys exhibited bimodal grain size distributions characterized by DRXed grains alongside deformed coarse grains with RD-oriented lamellar LPSO phases. Notably, a maximum DRX proportion of 49.92% was observed at 400 °C-10 s-1, attributed to the enhanced DRX nucleation induced by the added shear strain. This suggested that increasing the strain rate (400 °C-10 s-1, 49.92%) had a more pronounced effect on recrystallization than increasing the temperature (450 °C-0.1 s-1, 28.99%). Additionally, a characteristic //CD texture was observed in all the compressed alloys, which was predominantly influenced by the residual coarse grains with RD-oriented LPSO lamellae. The basal texture was marginally affected by randomly oriented DRX components with a limited proportion. Both continuous dynamic recrystallization (CDRX) and auxiliary discontinuous dynamic recrystallization (DDRX) mechanisms played roles in generating fine grains within bimodal structures. The initial unique microstructure, differential deformation behavior of the lamellar LPSO phase, and inhomogeneous nucleation were identified as key factors for the formation of inhomogeneous bimodal structures. This research aids in the understanding and manipulation of microstructures in Mg-RE alloys with the aim of fulfilling specific application needs. © 2024, The Authors. All rights reserved.

关键词： Nucleation

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Fault diagnosis method based on precise frequency domain integral and vibration severity

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ICIC Express Letters, Part B: Applications 2016年第11期7卷 2301-2307页

作者： Jiang, Wanlu Zhu, Yong Wang, Zhenwei Dong, keyan Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control China Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education of China Yanshan University No. 438 Hebei Ave. Qinhuangdao066004 China

Aiming at the features of vibration signal, a fault diagnosis method based on precise frequency domain integral (PFDI) and vibration severity (VS) was proposed. With this method, the hidden feature components in vibration signal were accurately extracted. Meanwhile, the interferences of ineffective signals such as trend item and noise were commendably overcome. And the desired vibration velocity signal was precisely obtained. Moreover, the type and severity of faults were identified through further spectrum analysis and VS comparison. The reliability and effectiveness of the method were testified by the measured data analysis. Results indicate that the method can accurately confirm fault type and severity. © 2016 ICIC International.

关键词： Failure analysis

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Reliability Evaluation of Axial Piston Pump based on Degradation Failure

Reliability Evaluation of Axial Piston Pump based on Degrada...

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第六届工程机械与车辆工程新进展国际学术会议

作者： Rui Guo Jinsheng Zhou Chi Zhang Jingyi Zhao Yi Zhang 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 College of Mechanical Engineering Yanshan University

Axial piston pump is very important in the hydraulic system,and its health affects the entire system *** wear and tear of the port plate pair is the main reason for the decrease of the axial

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Comfort degree of patients' rehabilitation training based on DSmT theory

Comfort degree of patients' rehabilitation training based on...

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第二届计算智能、工程与技术国际研讨会

作者： Hongbo Wang Hao Yan Baoshan Niu Xincheng Wang Yafeng Li Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Academy for Engineering &Technology Fudan University Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University

This paper aims to solve the problem that most rehabilitation robots lack to integrate their physiological functions and psychological states into closed controlling loop in rehabilitation training of stroke patients. The application of fusion technology of multi-electromechanical sensor signal and DSmT signal is used to achieve patients' comfort judgement. Mean value and variance are used to extract physiological information such as heart rate, temperature and skin resistance. Sensor informationof fusion technology of rehabilitation robot based on classical DSmT theory can realize on-line diagnosis of multi-comfort degree of patients' coupling.

关键词： Comfort degree of patients rehabilitation training based on DSmT theory

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An Approach of Power Allocation Scheme for Relay Communication Networks Based on Seller-Buyer Game

An Approach of Power Allocation Scheme for Relay Communicati...

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第三十四届中国控制会议

作者： Peng Zhang Zhixin Liu Ling Zhao Hongjiu Yang Xinbin Li Institute of Electrical 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, a robust optimization problem is formulated for decode-and-forward relay network via game *** uncertainty of channel gain is considered to overcome the performance degradation in practical environment. In this study,a probability threshold method is used to suppress the channel fluctuation. Besides, a seller-buyer game is formulated to jointly consider the maximum utility of source node and relay node. To reduce the overhead information exchanging, a distributed iteration algorithm is applied. Numerical results show the effectiveness of the proposed schemes, and also present the robustness of the relay network. Moreover, the proposed game is proved to converge to the unique equilibrium point.

关键词： Relay network game theory robust optimization outage probability distributed algorithm

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A Study on Improving Friction and Wear Performance of Bearing Bush in Radial Piston Hydraulic Motor

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SSRN 2024年

作者： Li, Ying Cui, Xueshi Yang, Yasen Zhang, Jin Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University China Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University Ministry of Education of China China

The radial piston hydraulic motor is widely used due to its ability to provide high torque output and stable speed control. However, it exhibits poor lubrication performance in low-speed, heavy-load conditions. Specifically, the friction and wear performance of the piston-roller friction pair directly affect the motor's starting torque, operational efficiency, and service life. To address the friction and wear issues of the piston-roller friction pair, a self-lubricating composite bearing bush is introduced between the friction pairs. The present study investigates the wear and friction properties of self-lubricating material sliding against bearing steel(GCr15SiMn). The materials are neat Poly Ether Ether Ketone (PEEK), PEEK with 10% Polytetrafluoroethylene (PTFE) and15% Potassium Titanate Whiskers (PTW). Additionally, the role of filler (i.e., nano-silica) in the PEEK-PTFE-PTW-bearing steel hybrid wear system is investigated. The composite materials have undergone surface modification using a silane coupling agent (KH550) to enhance the adhesion performance between the filler and the matrix. Imitating the working condition of the piston-roller friction pair, experiments are conducted under boundary lubrication conditions on a ring-to-disc tribometer. The worn surfaces were examined using confocal laser scanning microscopy and scanning electron microscopy. The results indicate that self-lubricating materials filled with 2% and 3% nanoscale silicon dioxide achieved the best tribological performance. © 2024, The Authors. All rights reserved.

关键词： Friction

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Study on thin-walled tube forming by solid granule medium forming

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ICIC Express Letters 2014年第9期8卷 2649-2654页

作者： Du, Bing Zhao, Changcai Dong, Guojiang Ya, Yuanyuan Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education Qinhuangdao 066004 China College of Vehicles and Energy Yanshan University No. 438 Hebei Avenue Haigang District Qinhuangdao 066004 China

Considering the limited forming force and oil leakage problem in the process of the hydraulic bulging, solid granule medium forming technology was used to meet the need of forming high precision thin-walled tube. The advantages of forming these parts by using the solid granule medium forming process are analyzed. Adopting Drucker- Prager yield model, numerical model of solid granule medium forming is developed. The matching relation between the tube axial force and the medium loading force by simulation is discussed. Compared with experimental results, the feasibility of Drucker-Prager model in the simulation of solid granule medium is confirmed. © 2014 ISSN 1881-803X.

关键词： Numerical models

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Research on the lower limb gait rehabilitation

Research on the lower limb gait rehabilitation

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IEEE International Conference on Mechatronics and Automation

作者： Hongbo Wang Jianshuang Wu Yubo Wang Lingxue Ren Dong Zhang Hao Lu Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao China Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao China

ISBN: (纸本)9781479939800

This paper proposes a lower limbs gait rehabilitation machine which is used to help the patients to recover walking ability of lower limbs. The machine includes left leg gait training mechanism and right leg gait training mechanism, and each mechanism consists of a four-bar mechanism with one degrees of freedom and a foot plate. Since the crank of the four-bar mechanism on the both sides is driven by one motor and each foot plate on the both sides is driven by one motor, the robot has three degrees of freedom. The robot can simulate human walking to achieve the purpose of recovering walking function. In this paper, the design idea and parameter optimization are described, the kinematics and dynamics are analyzed, and the virtual prototype design and simulation are done. The simulation results can be further applied for the optimization of the mechanical parameters while supplying necessary data and building a theoretical foundation for subsequent research.

关键词： Training Trajectory Legged locomotion Foot Force Equations

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