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34th Chinese control Conference, CCC 2015

作者： Fanjun, Li Junfei, Qiao Wei, Zhang College of Electronic Information and Control Engineering Beijing University of Technology Beijing China School of Mathematical Science University of Jinan Shandong China Beijing Key Laboratory of Computational Intelligence and Intelligent System Beijing China

ISBN: (纸本)9789881563897

In this paper, a fast growing cascade neural network (FGCNN) is proposed, as a software sensor, to rapidly estimate the biochemical oxygen demand (BOD) in wastewater treatment plants (WWTPs). Firstly, a novel method, based on the orthogonal least squares (OLS), is put forward to add input and hidden units to the existing network one by one. Every unit added to the network affords the maximal reduction of the sum of squared errors (SSE). Then, the FGCNN incrementally updates its output weights by iterations without gradients and generalized inverses, while the other weights remain unchanged during the growth of the network. The simple and effective training method make the FGCNN learn extremely fast. Finally, the proposed FGCNN is applied to estimate the BOD in WWTPs using other easy-to-measure or secondary variables. The experiment results show that the FGCNN has better performance on real-time estimation of BOD than other similar methods. © 2015 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Artificial neural network biochemical oxygen demand software sensor wastewater treatment plant

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Fan Fault Diagnosis Based on Wavelet Spectral Analysis

Fan Fault Diagnosis Based on Wavelet Spectral Analysis

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第三十四届中国控制会议

作者： Wen Zheng Wang Pu Gao Xuejin Zhang Yachao College of Electronic and Control Engineering Beijing University of Technology Engineering Research Center of Digital Community Ministry of Education Beijing Laboratory For Urban Mass Transit Beijing Key Laboratory of Computational Intelligence and Intelligent System

ISBN: (纸本)9781467374439

Fan plays an irreplaceable role in the ventilation of underground environment. It will cause serious consequences once the fan fails. So it is essential to do fault diagnosis of fan to prevent the emergence of break down. Spectral analysis method is a simple and effective method for signal analysis and it has been widely used in fault diagnosis of rotating machinery. This paper has researched the bearing fault of fan on the base of in-depth study of the frequency characteristics of typical faults fan. High-frequency noise of vibration signal has been removed through wavelet soft thresholding method. Get its spectrum characteristic of the reconstructed signal, and then the failure category of signal is discriminated by comparing its characteristic frequency to typical faults frequency in theory. Combining the advantage of Lab VIEW and MATLAB, we implement the algorithm through two of them, accomplishing denoising and spectral analysis of vibration signals, completing fault diagnosis of fan.

关键词： Fan Fault Diagnosis,Wavelet Denoising,Spectral Analysis

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Cover Feature: Ultrasensitive, Sustainable, and Selective Electrochemical Hydrazine Detection by ALD-Developed Two-Dimensional WO3(ChemElectroChem 2/2018)

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ChemElectroChem 2017年第2期5卷

作者： Zihan Wei Zhenyin Hai Mohammad Karbalaei Akbari Prof. Jie Hu Lachlan Hyde Prof. Stephen Depuydt Prof. Francis Verpoort Prof. Serge Zhuiykov Ghent University Global Campus Department of Applied Analytical & Physical Chemistry 119 Songdomunhwa-ro Yeonsu-gu Incheon South Korea Micro and Nano System Research Center Key Lab of Advanced Transducers and Intelligent Control System (Ministry of Education) & College of Information Engineering Taiyuan University of Technology Taiyuan 030024 Shanxi PR China Factory of the Future Swinburne University of Technology Hawthorn Australia National Research Tomsk Polytechnic University Lenin Avenue 30 634050 Tomsk Russian Federation Laboratory of Organometallics Catalysis and Ordered Materials State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center for Chemical and Material Engineering Wuhan University of Technology Wuhan P.R. China

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A Sophisticated RMPC Design for LPV systems based on the mixed multi-step feedback control 34

A Sophisticated RMPC Design for LPV Systems based on the mix...

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第三十四届中国控制会议

作者： ZHENG Pengyuan LI Dewei XI Yugeng LI Xiaoli College of Automation Engineering Shanghai University of Electric PowerShanghai Engineering Research Center of Intelligent Management and Control for Power Process Department of Automation Shanghai Jiao Tong UniversityKey Laboratory of System Control and Information Processing Ministry of Education School of Information Science and Technology Donghua University

ISBN: (纸本)9781467374439

This paper studies a sophisticated robust model predictive control(RMPC) design for linear parameter varying(LPV)systems with the varying parameter unmeasurable. Based on a mixed multi-step feedback control, a sophisticated control design which utilizes both multi-step control sets and parameter-dependent feedback control is developed to introduce more freedom and thus reduces the conservativeness. The proposed method achieves good control performance with guaranteed robust and stability properties, which is verified by simulation examples.

关键词： Linear parameter varying systems,Robust model predictive control,Parameter-dependent feedback control,Mixed multi-step feedback control,Linear matrix inequalities

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Study on Tool Path Optimization in Multi-axis NC Machining

Study on Tool Path Optimization in Multi-axis NC Machining

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2015年第二届机电一体化与机械工程国际学术会议

作者： Xinghua Niu Tianding Wang Bofei Shen Tiemin Zhao Qianyou Huang Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Tianjin University of Technology

This paper presents a new generation algorithm for tool path based on the optimization of traditional ***,the tool path on an impeller is generated with UG software,and it is used to make contrasts and verifications for the effect of ***,VERICUT software with the function of the simulating on the whole manufacturing process is utilized to verify the feasibility of the optimized algorithm.

关键词： NC machining path optimization UG VERICUT

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An electro-hydraulic control system with energy recycling

An electro-hydraulic control system with energy recycling

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Chinese Automation Congress (CAC)

作者： Taoxinjun Tao Junzheng Wang Jiangbo Zhao Xiaojie Hu Key laboratory of Intelligent Control and Decision of Complex System Beijing Institute of Technology Beijing China

ISBN: (纸本)9781467371902

When traditional electro-hydraulic proportional valve or servo valve controlled systems are used to drive unbalanced external load, the hydraulic valve itself exists throttling losses. At the same time, the excess kinetic or potential energy of external load is consumed in the form of heat. In order to reduce energy loss and recycle external load energy, this paper puts forward a kind of electro-hydraulic control equipment which can recycle energy. It consists of directional valve, hydraulic motor, generator, power transformation device. In details, the directional valve is used to control the fluid direction of hydraulic actuator, hydraulic motor is connected to the fluid return channel of the directional valve. A generator is connected to hydraulic motor so that the back pressure of the actuator can be controlled by adjusting the torque applied on the hydraulic motor. In this way, the trajectory of the actuator is controlled. The mechanical energy applied on the hydraulic motor can be converted to electricity via the power conversion device, and then transmitted back to the grid. The simulation and experiment results prove that the proposed scheme is feasible.

关键词： Valves Torque Generators Actuators Recycling

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Stackelberg Game Model of Wind Farm and Electric Vehicle Battery Switch Station

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IOP Conference Series: Materials Science and Engineering 2017年第1期199卷

作者： Zhe Jiang Zhimin Li Wenbo Li Mingqiang Wang Mengxia Wang Department of Electrical Engineering Harbin Institute of Technology Harbin 150001 China. Electric Power Research Institute State Grid Shandong Electric Power Company Jinan 250003 China. Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan 250061 China. Collaborative Innovation Center for Global Energy Interconnection (Shandong) Jinan 250061 China.

In this paper, a cooperation method between wind farm and Electric vehicle battery switch station (EVBSS) was proposed. In the pursuit of maximizing their own benefits, the cooperation between wind farm and EVBSS was formulated as a Stackelberg game model by treating them as decision makers in different status. As the leader, wind farm will determine the charging/discharging price to induce the charging and discharging behavior of EVBSS reasonably. Through peak load shifting, wind farm could increase its profits by selling more wind power to the power grid during time interval with a higher purchase price. As the follower, EVBSS will charge or discharge according to the price determined by wind farm. Through optimizing the charging /discharging strategy, EVBSS will try to charge with a lower price and discharge with a higher price in order to increase its profits. Since the possible charging /discharging strategy of EVBSS is known, the wind farm will take the strategy into consideration while deciding the charging /discharging price, and will adjust the price accordingly to increase its profits. The case study proved that the proposed cooperation method and model were feasible and effective.

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Research on the performance of electro-hydraulic proportional flow valve controlled by pilot pump

Research on the performance of electro-hydraulic proportiona...

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International Conference on Fluid Power and Mechatronics (FPM)

作者： Yunxiao Hao Jiahai Huang Wenyong Li Long Quan Bin Zhao Key Laboratory of Advanced Transducers and Intelligent Control System Taiyuan University of Technology Taiyuan Shanxi China

ISBN: (纸本)9781479987719

Cartridge flow valves, widely applied in heavy machine and equipment, have the advantages of low leakage, large flow capacity, and simple structure. However, in the existence technologies, in order to reduce the influence of load variety on valve flow, a pressure differential compensator or a cartridge type flow sensor should be added to proportional throttle valve. This method reduces valve flow capacity and increases system throttling loss. In large flow occasion, flow only can be indirectly controlled by changing valve opening area for the limitation of the structure. So a low energy consumption, high controllable electro-hydraulic proportional valve which is structured by a hydraulic transistor (Valvistor) and a small displacement hydraulic pump driven by a servo motor is introduced. Based on the Valvistor valve flow amplification principle, main valve flow is controlled by pilot pump flow which is controlled by changing rotation speed without the influence of load variety. In the research, it's known from the analysis of the new principle valve steady flow characteristics that feedback throttle slot pre-opening will cause the decrease of the main valve flow as pressure drop increases. Soa method of pressure differential-pilot pump rotation speed compensation is put forward and it can obtain ideal flow characteristic. Then the dynamic mathematical model is established and the main valve stability criterion is derived. The influence of the valve parameters on main valve performance is analyzed and simulated. The results provide a new method for the large flow electro-hydraulic proportional control system.

关键词： Valves Mathematical model Analytical models Load modeling Force Stability criteria

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Compensation of friction and elastic deformation for ball screw drive system

Compensation of friction and elastic deformation for ball sc...

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IEEE International Conference on Mechatronics and Automation

作者： Hongbiao Xiang Shoujun Wang Chunqiu Zhang Xingfei Li Jun Liu Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Tianjin University of Technology Tianjin CN Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Tianjin University Tianjin Tianjin CN

Nonlinear friction and elastic deformation seriously affect both static and dynamic performance of mechanical serve system, especially in the high-speed and high-precision systems. This paper focuses on modeling, identification, and compensation of non-linear friction and elastic deformation for ball screw drive system. Firstly, the parameters of the stribeck model are identified by the method of extended kalman filter. And then the parameters of stiffness model of the ball screw are identified by the method of the least square based on force analysis of system. Finally, the feed-forward compensation of friction and elastic deformation is performed. The experimental results show that: after the compensation, the steady state error of low-speed motion decreases from 42μm to ±3μm, and that of high-speed motion decreases from 95μm to ±5μm. Therefore, the method proposed can effectively compensate the disturbance of friction and elastic deformation, and improve the tracking accuracy of the ball screw drive system.

关键词： Friction Fasteners Mathematical model Servomotors Deformable models Tracking Force

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Design of dual-frequency bioreactor control system

Design of dual-frequency bioreactor control system

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IEEE International Conference on Mechatronics and Automation

According to tissue engineering and basic principle of bionic, the low-frequency high-amplitude loading on articular cartilage is to simulate human walking or other activities, and the high-frequency low-amplitude loading is to maintain the cartilage framework structure from muscles, ligaments and other tissue. In order to build appropriate mechanical environment for cartilage tissue engineering, this paper design a dual-frequency bioreactor, and the control precision and performance is improved by a method of friction compensation. The control system is full closed loop composed of liner motor and grating scale, based on PC+PMAC opened control platform. Firstly, a dynamic equation of an open servo system is given and the friction characteristics are described based on Stribeck model. Secondly, Considering the parameters of friction model changed with the system, the controller of adaptive sliding friction compensation is designed by backstepping method, and the corresponding adaptive laws and switching functions are given. Besides, this method give analysis of its global asymptotic stability, proved by Lyapunov theorem. Finally, the adaptive sliding friction compensation control strategy is realized by Programmable Multi-Axis controller (PMAC), and the effectiveness of the method is verified by experiments. Results show that the steady state error of sinusoidal motion is decreased from the ± 22μm to ± 4μm compared with the velocity and acceleration forward feed-compensation. The dual-frequency bioreactor can simulate the mechanical environment of artificial cartilage tissue engineering on micrometer level, furthermore, it laid a foundation for the research of mechanobiology of cartilage.

关键词： Friction Mathematical model Tissue engineering Loading Adaptation models Servomotors

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