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Chattering-Free Discrete-time Fast Terminal Sliding Mode Control of Automotive Electronic Throttle with Disturbances

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Chattering-Free Discrete-time Fast Terminal Sliding Mode Con...

第三十九届中国控制会议

作者： Mengying Song Shihua Li haibo du Zuo Wang School of Automation Southeast University School of Electrical Engineering and Automation Hefei University of technology

The electronic throttle determines the intake volume of the automobile engine,which directly affects the fuel efficiency and gas emissions of the *** the control performance of the automobile electronic throttle plays an important role in energy saving and emission ***,due to multiple nonlinearities,i.e.,friction,spring,gear backlash and a series of external disturbances,the accurate control of the electronic throttle is a challenging *** this paper,a chattering-free discrete-time fast terminal sliding mode control law is designed for electronic throttle systems based on disturbance *** the proposed algorithm,a nonsmooth function is introduced to replace the switching function in the traditional discrete-time sliding mode *** alleviates the chattering problem of control ***,the fast terminal sliding mode surface is applied in this algorithm to replace the linear sliding mode *** dynamic response and higher position tracking accuracy can be ***,the disturbance compensation is added to the control law to eliminate the influence caused by disturbances,which improves the disturbance rejection ***,simulation comparisons with the traditional discrete-time sliding mode control are presented to validate the effectiveness and feasibility of the proposed control approach.

关键词： Electronic throttle Non-smooth control Discrete-time sliding mode control Disturbance rejection

Finite-time Leaderless Consensus of Second-order Multi-agent Systems With Velocity and Input Constraints

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Finite-time Leaderless Consensus of Second-order Multi-agent...

第32届中国控制与决策会议

作者： Bibo Liu haibo du Jun Zhou Di Wu School of Electrical Engineering and Automation Hefei University of Technology Department of Systems Science School of MathematicsSoutheast University

This paper considers a method for the finite-time consensus control of second-order multi-agent systems in leaderless case by both velocity and input constraints.A new class of distributed consensus controllers are proposed,which shows that under the appropriate initial speed conditions,the velocity and input constraints can be met in the consensus process while achieving finite-time ***,some simulation results are proposed to verify the effectiveness of the controller.

关键词： Finite-time consensus Velocity constraints Input saturation

Global finite-time attitude stabilization for spacecraft under velocity constraint

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Global finite-time attitude stabilization for spacecraft und...

第三十九届中国控制会议

作者： Bo Yu haibo du Jun Zhou Di Wu School of Electrical Engineering and Automation Hefei University of Technology Anhui Province Engineering Research Center for Industrial Automation Hefei University of Technology School of Automation Southeast University

This paper mainly investigates the attitude control problem with angular velocity constraints for a spacecraft. First of all, a finite-time attitude controller with angular velocity constrains is proposed. Under the action of this controller, the quaternion attitude can be stabilized to the desired value and the angular velocity can be stabilized to the origin in a finite time. Secondly, in the simulation section, the effectiveness of the proposed controller is demonstrated.

关键词： attitude control angular velocity constraint finite-time

Flying velocity constraint control for quad-rotor system based on finite-Time control technique

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Flying velocity constraint control for quad-rotor system bas...

第三十九届中国控制会议

作者： Jiajia Wei Jun Zhou haibo du Di Wu School of Electrical Engineering and Automation Hefei University of Technology School of Automation Southeast University

For position tracking problem for quad-rotor system with velocity constrains, a finite-time position control method with velocity constrains is proposed in this paper. Firstly, based on backstepping design, a finite-time position tracking controller with velocity constraints is proposed to ensure that the desired position can be tracked in a finite time with velocity ***, simulation results are given to verify the effectiveness and advantages of proposed position controller with velocity constrains.

关键词： Finite-time control Quad-rotor system Position tracking Velocity constraints

Pr-Tb synergistic strengthening on coercivity of Nd-Ce-Fe-B magnets grain boundary diffused with Pr-Tb-Al-Ga alloys

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Journal of Rare Earths 2024年第9期42卷 1704-1709,I0003页

作者： Ruifang Song Hang Zhao haibo Feng Institute of Functional Materials Central Iron&Steel Research InstituteBeijing100081China

Sintered Nd-Ce-Fe-B magnets were grain boundary diffused(GBDed) with Pr_(x)Tb_(80-x)Al_(10)Ga_(10)(at%)(x=0,20,40,60,80) *** effect of Pr/Tb content in diffusion source on magnetic properties,microstructure and elements distribution of GBDed magnets was *** Pr is used to substitute for 75% Tb in diffusion source,Tb consumption per unit coercivity improvement of GBDed magnet reduces by 77%,compared with the Tb_(80)Al_(10)Ga_(10) diffused *** element diffuses into magnets and then forms Tb-rich shell with high magneto-crystalline anisotropy field surrounding main phase grains,resulting in substantial coercivity *** with low melting point diffuses deeply along liquid grain boundary phase during GBD *** can eliminate some sharp defects of main phase grains and make grain boundaries smooth,which provides diffusion channels for further diffusion of Tb ***,there are more diffusion channels for Tb and less Tb enriched at surface region,making Tb diffuse more deeply and improving Tb utilization *** method significantly improves the coercivity,and realizes the green,efficient and high-quality utilization of heavy rare earth(HRE)elements.

关键词： Grain boundary diffusion Rare earths Microstructure Synergistic strengthening

Current-constrained Finite-time Control Algorithm for Buck Converter

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Current-constrained Finite-time Control Algorithm for Buck C...

第32届中国控制与决策会议

作者： Qingqiu du haibo du Min Zhu Bo Yu Yingying Cheng Di Wu School of Electrical Engineering and Automation Hefei University of Technology School of Automation Southeast University

In this paper,the current-constrained problem is *** order to track the voltage to the reference voltage quickly,a finite-time control algorithm is ***,considering that when the voltage changes rapidly,the current in the circuit will increase,which will cause damage to the devices in the ***,a current-constraint algorithm must be applied to the *** controller designed in this paper can achieve stability in finite-time,and the correctness of the control algorithm is ***,the simulation is carried out to verify the dynamic and steady-state performance of the proposed method.

关键词： DC-DC Buck converter Finite-time control Current-constrained

Electrospun Chitosan( CS)/Poly( L-lactic-co-ε-caprolactone)( PLCL ) Nanofibers and Their Potential as Small-Diameter Vascular Scaffold

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Journal of Donghua University(English Edition) 2018年第1期35卷 32-37页

作者： TAO Ling WANG Weizhong LIU Dinghua du haibo ZHANG Qianqian CHEN Liang HE Chuanglong College of Chemistry Chemical Engineering and Biotechnology Donghua University Shanghai 201620 China

The ideal small-diameter vascular grafts should mimic the nanostructure and mechanical properties of nature blood vessel. In this study, electrospun chitosan( CS)/poly( L-lactic-co-ε-caprolactone)( PLCL) nanofibers were developed for potential small-diameter blood vessel applications. CS is a positively charged polymer which is beneficial for cell attachment and growth,while PLCL provides favorable mechanical support due to its excellent elasticity. Typical nanofibrous structure was observed in both CS/PLCL and pure PLCL scaffolds. The optimal mechanical property could be achieved when the weight ratio of CS/PLCL was 1 ∶ *** with pure PLCL scaffolds, the CS/PLCL scaffolds showed higher hydrophilicity and markedly promoted the attachment,spreading and proliferation of human umbilical vein endothelial cells( HUVECs). Hence,CS/PLCL scaffolds can be used as potential vascular grafts.

关键词： electrospinning chitosan(CS) ploy(L-lactic-co-ε-caprolactone)(PLCL) vascular scaffolds

A Nested Saturated Second-order Sliding Mode Controller Design

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A Nested Saturated Second-order Sliding Mode Controller Desi...

第37届中国控制会议

作者： Keqi Mei Shihong Ding Wei Xing Zheng haibo du School of Electrical and Information Engineering Jiangsu University School of Computing Engineering and Mathematics University of Western Sydney School of Electrical Engineering and Automation Hefei University of Technology

In this paper, a nested saturated second-order sliding mode（SOSM） controller has been constructed based on the saturation technique and geometric method. The proposed controller includes a saturation function, which could change the phase trajectory of the sliding variables under the traditional SOSM algorithms. The geometric method has been used to test the finite-time convergence of the sliding variables and reveal the relations between the control parameters and the shape of the phase trajectory. Finally, a numerical example has been given to validate the effectiveness and feasibility of the proposed method.

关键词： Second-order sliding mode Lyapunov analysis finite-time stability

Design method of multivariable PI controller for turboprop engine based on equivalent transfer function

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CHINESE JOURNAL OF AERONAUTICS 2024年第9期37卷 237-260页

作者： Li, Shancheng Wang, Yong Zhang, haibo Nanjing Univ Aeronaut & Astronaut Coll Energy & Power Engn Jiangsu Prov Key Lab Aerosp Power Syst Nanjing 210016 Peoples R China

Traditional centralized Proportional Integral (PI) controller design methods based on Equivalent Transfer Functions (ETFs) have poor decoupling effect in turboprop engines. In this paper, a centralized PI design method based on dynamic imaginary matrix and equivalent transfer function is proposed. Firstly, a method for solving equivalent transfer functions based on the dynamic imaginary matrix is proposed, which adopts dynamic imaginary matrix to describe the dynamic characteristics of the system, and obtains the equivalent transfer function based on the dynamic imaginary matrix characteristics. Secondly, for the equivalent transfer function, a centralized PI control gain is designed using the Taylor expansion method. Meanwhile, this paper further proves that the centralized PI design method proposed in this paper has integral stability. Considering the impact of altitude and Mach number on turboprop engines, a linear feedforward control method based on the transfer function matrix is further proposed based on the centralized PI controller, and the stability of the entire comprehensive control method is proved. Finally, to ensure the safe and effective operation of the turboprop engine, a temperature and torque limiting protection controller is designed for the turboprop engine. Simulation results show that the centralized PI controller design method and linear feedforward control method proposed can effectively improve the control quality of turboprop engine control System. (c) 2024 Production and hosting by Elsevier Ltd. on behalf of Chinese Society of Aeronautics and Astronautics. This is an open access article under the CC BY-NC-ND license (http://***/ licenses/by-nc-nd/4.0/).

关键词： Multivariable control sys- tems Equivalent transfer function Disturbance compensation control Control parameter design Turboprop engine control