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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： Liu Tao Zhang lian-meng Zhang Dan Li wei-jian Zhang xin-yu Hebei Province Laboratory of Heavy Machinery Fluid Power Transmission and Control Key Laboratory of Ministry of Education for Advanced Forging Press Forming Technology and Science

Machine vision is widely used in welding intelligent technology,weld identification is an important prerequisite and *** paper expounds the identification method of non-smooth welds and use

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Active Disturbance Rejection Trajectory Tracking Control for Pneumatic Servo System Based on Backstepping Approach

Active Disturbance Rejection Trajectory Tracking Control for...

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第三十四届中国控制会议

作者： Yafei Yang Ling Zhao Xiaozhao Fan Zhixin Liu School of Electrical Engineering Yanshan University 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 Engineering Yanshan University

ISBN: (纸本)9781467374439

This paper presents an improved active disturbance rejection controller to study the trajectory tracking problem of a pneumatic servo system. It is a challenging job to track a given trajectory for pneumatic system with strong nonlinearity. The designed active disturbance rejection controller consists of tracking differentiator, extended state observer and nonlinear *** differentiator is designed to arrange a transition process for the given signal and get its corresponding differential *** state observer has advantages in observing states and estimating the nonlinear part of system. Moreover, a nonlinear controller is derived on the basis of backstepping approach. Finally, simulation results indicate the capabilities of the proposed method.

关键词： Active disturbance rejection control,Backstepping approach,Rodless pneumatic cylinder,Trajectory tracking

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Study on Double Differential Pressure Dynamic Flowmeter

Study on Double Differential Pressure Dynamic Flowmeter

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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： Liu Tao Yin zhi-gang Zhang lian-meng Zuo zhi-bing Hebei Province Laboratory of Heavy Machinery Fluid Power Transmission and Control Key Laboratory of Ministry of Education for Advanced Forging Press Forming Technology and Science

In the test of electro-hydraulic proportional valve,it is necessary to test the high frequency dynamic flow with *** of the limitation of piston stroke,no load hydraulic cylinder is only suit

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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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Sliding mode control for network control systems with packets dropout

Sliding mode control for network control systems with packet...

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第三十四届中国控制会议

作者： Luyang Zhang Ling Zhao Li Li Institute of Electrical Engineering Yanshan University 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 Engineering Yanshan University

ISBN: (纸本)9781467374439

In this paper, we investigate the problems of stabilization of networked control systems with packets dropout via delta operator approach. A sliding mode controller is constructed to analyze the stochastic stability of the closed-loop networked control systems. The process of packets dropout is modeled as a Bernoulli process. Sufficient LMI conditions are developed to guarantee the existence of the discrete linear sliding surfaces. By solving the conditions, a linear sliding surface is characterized and a sliding mode controller is designed. Simulation results are given to demonstrate the effectiveness of the proposed approach.

关键词： Sliding mode control,network control systems(NCSs),delta operator system,packets dropout

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Structural Design and Simulation Optimization of New Type Telescoping Heavy Hydraulic Trailer Steering System

Structural Design and Simulation Optimization of New Type Te...

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The 16th International Conference on Fluid Dynamic and Mechanical & Electrical Control Engineering(FDMECE2012)

作者： Rui Guo Jingyi Zhao Yongchang Wang Decai Han Hebei Province key laboratory of heavy machinery fluid power transmission and control Ministry of education key laboratory of Advanced forging technology and science Environmental Management College of China

ISBN: (纸本)9783037855164

The length variability of telescoping heavy hydraulic trailer wills casue friction and sliding,increasing drag torque and power consumption of steering,moreover,and reducing the security and reliability of steering,so the new type follow-up steering system is designed and studied. In order to reduce the turning radius and tire wear,the adjustable steering wheel structure and double front axle mechanism are *** this basis,the theoretical analysis of the steering system is carried out,and the mathematical model is *** minimum error of actual and ideal angle is regarded as the optimization goal of pure rolling condition,and the simulation optimization and experimental research is *** results show that:the steering structural optimization is feasible, the performance is optimal on the condition that the actual and ideal angle valves of inside and outside wheels of each axis are approximately equal in turning process,and can reflect the advantage of new follow-up steering system in lowering power consumption,improving product life cycle and other areas.

关键词： telescoping heavy hydraulic trailer follow-up steering system steering error simulation optimization

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Study on the safety design of main arm mechanism in slag pot carrier

Study on the safety design of main arm mechanism in slag pot...

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The 16th International Conference on Fluid Dynamic and Mechanical & Electrical Control Engineering(FDMECE2012)

作者： Rui Guo Jingyi Zhao Decai Han Yongchang Wang Hebei Province key laboratory of heavy machinery fluid power transmission and control Ministry of education key laboratory of Advanced forging technology and science Environmental Management College of China

ISBN: (纸本)9783037855164

According to the new kind of the upper arm mechanism of the slag pot carrier,optimization design,simulation and experimental research are carried out,in which the combination of conventional design,three dimensional virtual design and experimental study are *** motion law of multi-segment arc slide way of main arm is given by means of researching the motion process of slag ladle in the main arm slide *** functional relationship among the internal parameters of the arm mechanism,and between load force and arm movement is revealed by studying kinematics of mechanism and dynamics law of the upper arm *** finite element analysis of the upper arm mechanism is carried out to get the weak links of structure strength,and then the improvement solution is *** experiments,the method correctness of optimization and design of upper arm mechanism is testified by the coincidence of the trial results and experimentation results.

关键词： slag pot carrier mechanism design Virtual technology Simulation and Optimization Experimental study

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Morphology observation for surface orange peel and fracture in tension sample of aluminum-alloy sheet and characterization of nano hardness

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Engineering sciences 2012年第6期10卷 2-6页

作者： Ma Mingtu Mei Huasheng Lu Hongzhou Yang Hongya Wu Emei Zhou Mingbo China Automotive Engineering Research Institute Co.Ltd. No.59 Institute of China Ordnance Industry Chongqing New Materials Engineering Center Key Laboratory of Advance Forging & Stamping Technology and Science Yanshan University

The tension property of aluminum-alloy sheet with different microstructures is measured, and the surface and tension fracture morphology of tension sample with and without orange peel are observed by using scanning electron microscope （SEM）. Surface roughness and nano hardness of tension sample are measured. The results show that the average elongation of the samples with orange peel is lower than that without orange peel ; especially the r value of per- pendicular to the rolling direction is much lower than that without orange peel. The tension surface of the orange peel samples is very rough; various parameters of surface roughness are higher. Under the observation of SEM, a wider slid- ing band with a micro crack on the surface of orange peel sample can be found. The various parameters of surface rough- ness without orange peel sample are near to zero, the sliding band is narrow and without micro cracks. The dimple width in tensile fracture of orange peel sample is larger than that without orange peel sample, but shear lip is narrower. The nano hardness testing results show that samples with orange peel behave high elastic modulus, high hardness, and high maximum load, but low plastic deformation depth. These mentioned features can completely describe surface and frac- ture morphology of tension samt31es with oranze peel.

关键词： mechanical property orange peel tension fracture nano hardness

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The Design of An Intelligent Self-Reconfigurable Single-Module Robot

The Design of An Intelligent Self-Reconfigurable Single-Modu...

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Electronic technology and Information science (ICETIS), International Conference on

作者： Zezheng Xing Qiuwei Zheng Lang Xiong Yundou Xu Laboratory of Parallel Robot and Mechatronic System of Hebei Province Yanshan University Qinhuangdao China School of Mechanical Engineering Yanshan University Qinhuangdao China Key Laboratory of Advanced Forging & Stamping Technology Science (Yanshan University) Ministry of Education of China Qinhuangdao China

ISBN: (数字)9798350388343

ISBN: (纸本)9798350388350

Self-reconfigurable robot is a typical modular robot, which is composed of a large number of identical modules based on cell design idea. Perform a job by combining it as a whole while working. At present, the carrying capacity of the self-reconfigurable robot is limited and the degree of intelligence is not high, which leads to the limited working ability of the self-reconfigurable robot. Therefore, an intelligent single-module self-reconfigurable robot is designed in this paper. Firstly, a high stiffness bidirectional butt locking mechanism is designed for the connection between modules. Secondly, aiming at the task of quick survey of fire rescue environment, the identification and distance detection of ignition point and rescue personnel are designed in the fire environment. The BI _ A * algorithm is used to complete the single-module path planning of the self-reconfigurable robot, and the Multi_ Bi _ A * algorithm is proposed for the optimal path planning of the collection of multi-module self-reconfigurable robots. Finally, the functional verification of the prototype is completed by using a single three-room model experiment platform.

关键词： Surveys Target recognition Prototypes Programming Multitasking Stability analysis Path planning

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A new tracking control method for synchronization of spacecraft formation with switching topologies

A new tracking control method for synchronization of spacecr...

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第三十三届中国控制会议

作者： Ling Zhao Xiu You Fuchun Sun Zhixin Liu Hongjiu Yang 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 Institute of Electrical Engineering Yanshan University Department of Computer Science and Technology Tsinghua University

ISBN: (纸本)9781479947249

This paper studies an attitude synchronization problem for spacecraft formation with switching interaction *** adaptive control architecture which allows for parameter uncertainties and unknown external disturbances is established for the decentralized controllers *** paper also shows that the attitude synchronization under dynamically changing interaction topologies can be achieved asymptotically if the union of the switching communication graphs is jointly connected in a finite time ***,some simulations indicate the capabilities of the proposed results.

关键词： Spacecraft formulation attitude synchronization adaptive control switching topology.

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