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International Conference on Smart City and Systems Engineering (ICSCSE)

作者： Yuqin Zhao Jingchao Liu Runsheng Zhang Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of National Education Yanshan University Qinhuangdao Hebei China College of Vehicle and Energy Yanshan University Qinhuangdao Hebei China

ISBN: (纸本)9781509055319

This article developed an on-board road restrictions geometric information measurement system, it is based on the principle of binocular stereo vision. This thesis complete the stereo camera calibration, finished the establishment of stereo camera model. According to the characteristics of the bridges and tunnels' lower edge, this thesis proposes a bridge detection method based on vehicle vision. The results show that, the system has good real-time performance and high reliability, can effectively reduce the traffic accident like wedging or hitting bridges caused by over-height vehicles.

关键词： Image edge detection Bridges Cameras Vehicles Image segmentation Feature extraction

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Steady-State Creep Behavior of Super304H Austenitic Steel at Elevated Temperatures

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Acta Metallurgica Sinica(English Letters) 2015年第11期28卷 1336-1343页

作者： Ping Ou Long Li Xing-Fei Xie Jian Sun Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiaotong University School of Materials Science and Engineering Jiangxi University of Science and Technology

Creep behavior of Super304H austenitic steel has been investigated at elevated temperatures of 923-973 K and at applied stress of 190-210 MPa. The results show that the apparent stress exponent and activation energy in the creep deformation range from 16.2 to 27.4 and from 602.1 to 769.3 kJ/mol at different temperatures, respectively. These high values imply the presence of a threshold stress due to an interaction between the dislocations and Cu-rich precipitates during creep deformation. The creep mechanism is associated with the dislocation climbing governed by the matrix lattice diffusion. The origin of the threshold stress is mainly attributed to the coherency strain induced in the matrix by Cu-rich precipitates. The theoretically estimated threshold stresses from Cu-rich precipitates agree reasonably with the experi- mental results.

关键词： Super304H steel Cu-rich precipitate Creep Threshold stress

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EBSD characterization of deformed lath martensite in IF steel

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IOP Conference Series: Materials Science and Engineering 2017年第1期219卷

作者： Z Lv X Zhang X Huang N Hansen Key Laboratory of Advanced Forging & Stamping Technology and Science (Ministry of Education of China) Yanshan University Qinhuangdao 066004 China Section for Materials Science and Advanced Characterization Department of Wind Energy Technical University of Denmark Risø Campus DK-4000 Roskilde Denmark

Rolling deformation results in the transformation of a lath martensite structure to a lamellar structure characteristic to that of IF steel cold-rolled to medium and high strains. The structural transition takes place from low to medium strain, and electron backscatter diffraction analysis shows that the frequency of medium angle boundaries with misorientation angles of 5-10° decreases with increasing strain, while the frequencies of boundaries with angles in the ranges of 1-5° and 10-25° increase, resulting in the evolution of a bimodal misorientation angle distribution. The microstructural evolution and the strength are characterized for lath martensite rolled to a thickness reduction of 30%, showing that large changes in the misorientation take place, while the strain hardening rate is low.

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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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Adaptive friction compensation for large diameter electro-hydraulic proportional valve cores based on LuGre

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High technology Letters 2015年第4期21卷 371-378页

作者：孔祥东 Song Yu Ai Chao Li Yanpeng Tian Dezhi Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University) Ministry of Education of China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University School of Mechanical Engineering Yanshan University

This paper presents an adaptive friction compensation method based on LuGre model for large diameter electric-hydraulic proportional valves in which the valve core contains friction.A mathematic model of the electric-hydraulic proportional valve is established,and the friction characteristics are described based on the LuGre *** global asymptotic stability of the control system with the adaptive friction compensation controller is guaranteed over Lyapunov *** adaptive compensation of the friction on LuGre friction model is verified by simulation and *** steady-state error is about [-4.23 × 10^(-5)m,5.91 × 10^(-5)m]and[-2.5 × 10^(-4)m,2.6 ×10^(-4) m] on simulation and experiment,the position tracking accuracy is higher,and the lag time of the main valve through the dead zone is *** result proves that the adaptive friction compensation method can effectively compensate for the negative effects of nonlinear friction.

关键词： electric-hydraulic proportional valve pilot stage LuGre adaptive friction com- pensation experimental identification

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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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Functional microstructural surface manufacturing and assessment

Functional microstructural surface manufacturing and assessm...

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第五届国际仿生工程学术大会(ICBE2016)

作者： Xun Chen James Wharton Zhiqing Hu Chengchun Zhang Haolin Li Haoyang Cao Advanced Manufacturing Technology Research Laboratory General Engineering Research InstituteLiverpool John Moores Unisity Rolling Forging Research Institute Jilin University Key Laboratory of Engineering Bionics (Ministry of Education) Jilin University College of Mechanical Engineering University of Shanghai for Science and Technology

Reduction of energy consumption is one of key issues for the sustainable development. Recent technological development in manufacturing technology has enabled engineers to create surfaces with defined geometrical structures. This paper will presents a review of the currently available literature surrounding the research of functional structural surfaces in relation to the beneficial properties, such as frictional reduction and drag reduction. Various manufacturing methods for the creation of microstructural surface will be compared in terms of production efficiency and economic production scale. A particular focus will be put on grinding which provides a new way for structural functional surface creation. Many researchers have attempted to relate the measured parameters of micro-structured surfaces to different functions. The paper will present some research results on the metrological parameters, which are currently used in industry. The investigation results show that the commonly used surface roughness measure, for example, Ra, may not be the best parameter for the functional surface quality control in terms of tribological performance. With the investigation conducted, it would suggest that 3D measurement parameters could be better that those 2D parameters. It was found that some particular structures on functional surface possess beneficial functions that could reduce energy consumption. Some recent investigations in LJMU will also be introduced to demonstrate the benefits could be acquired from microstructural surfaces.

关键词： microstructural surface manufacture assessment

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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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Research of Customized Aortic Stent Graft Manufacture

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IOP Conference Series: Materials Science and Engineering 2017年第1期187卷

作者： Lei Zhang Xin Chen Muhan Liu Department of Mechanical Engineering Biomanufacturing Center Tsinghua University Beijing 100084 P.R.China Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing Beijing 100084 P.R.China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Beijing 100084 P.R.China

Thoracic descending aorta diseases include aortic dissection and aortic aneurysm, of which the natural mortality rate is extremely high. At present, endovascular aneurysm repair (EVAR) has been widely used as an effective means for the treatment of descending aortic disease. Most of the existing coating stents are standard design, which are unable to meet the size or structure of different patients. As a result, failure of treatment would be caused by dimensional discrepancy between stent and vessels, which could lead to internal leakage or rupture of blood vessels. Therefore, based on rapid prototyping sacrificial core – coating forming (RPSC-CF), a customized aortic stent graft manufactured technique has been proposed in this study. The aortic stent graft consists of film and metallic stent, so polyether polyurethane (PU) and nickel-titanium (NiTi) shape memory alloy with good biocompatibility were chosen. To minimum film thickness without degrading performance, effect of different dip coating conditions on the thickness of film were studied. To make the NiTi alloy exhibit super-elasticity at body temperature (37°C), influence of different heat treatment conditions on austenite transformation temperature (Af) and mechanical properties were studied. The results show that the customized stent grafts could meet the demand of personalized therapy, and have good performance in blasting pressure and radial support force, laying the foundation for further animal experiment and clinical experiment.

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