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Yaw stabilization and maneuvering control of tailless flying wing by co-directional fluidic thrust vectoring 认领 引用 被引量：1
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作者 Liu ZHANG Meng HE 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第1期66-77,共12页
Fluidic Thrust Vectoring(FTV)is used for the yaw attitude control of tailless flying wing,which can significantly improve stealth performance,maneuverability and lateral/heading maneuverability.The FTV control scheme ... Fluidic Thrust Vectoring(FTV)is used for the yaw attitude control of tailless flying wing,which can significantly improve stealth performance,maneuverability and lateral/heading maneuverability.The FTV control scheme of co-directional secondary flow was designed based on a 30 kgf thrust turbojet engine,an equivalent rudder deflection control variable of Mass Flow Combination(MFC)was proposed,and a control model was established to form a FTV control system scheme,which was integrated with the flight control system of a 100 kg tailless flying wing with medium aspect ratio to achieve closed-loop control of the yaw attitude based on FTV.The heading stability augmentation and maneuvering control characteristics and time response characteristics of tailless flying wing by FTV were quantitatively studied through virtual flight test in a wind tunnel at a wind speed of 35 m/s.The results show that the control strategy based on MFC achieves bidirectional continuous and stable control of thrust vector angle in a range of±11°,and the thrust vector angle varies monotonically with MFC;the co-directional FTV realizes bidirectional continuous and stable control of the yaw attitude of tailless flying wing,without longitudinal/lateral coupling moment.The increment of the maximum yawing moment coefficient is 0.0029,the maximum yaw rate is 7.55(°)/s,and the response time of the yaw rate of the vectoring nozzle actuated by the secondary flow is about 0.06 s,which satisfies the heading stability augmentation and maneuvering control response requirements of the aircraft with statically unstable heading,and provides new control means for the heading rudderless attitude control of tailless flying wing. 展开更多
关键词 Thrust vectoring Flow control Coanda effect Flying-wing aircraft Flight tests Yaw control
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Parametric scaling and flow categories characterization in minijet-manipulated supersonic jets for shock vector control 认领 引用
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作者 Changhao TAN Zheng LIN +2 位作者 Zihang TAN Xi HE Dewei FAN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第4期118-132,共15页
A parametric study is numerically conducted for the Shock Vectoring Control(SVC)of a round supersonic jet with a design Mach number 1.5 using a single steady minijet.Control performance is quantified by the thrust vec... A parametric study is numerically conducted for the Shock Vectoring Control(SVC)of a round supersonic jet with a design Mach number 1.5 using a single steady minijet.Control performance is quantified by the thrust vectoring angle.Three control parameters are extensively investigated,including the mass flow rate ratio,injection location of the minijet,and nozzle pressure ratio of the main jet.Numerical simulations point out that the thrust vectoring angle depends on these three control parameters.Careful scaling analysis unveils that the three parameters may be reduced to a single dimensionless scaling factor,quantifying the vectoring angle.The scaling factor is physically the penetration depth of the minijet into the main jet.A detailed discussion is conducted based on this scaling law on the prediction of optimal efficiency for practical applications,which is a new indicator of merit to evaluate the performance of SVC systems.Intriguingly,the SVC of jet is further classified into four typical flow categories,for which corresponding physical conceptual models are also proposed. 展开更多
关键词 Active control Scaling law Shock wave vectoring Supersonic jet Thrust vectoring
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Design and Implementation of Closed-Loop Control of Vector Force in Static Push-the-bit Rotary Steering System 认领 引用 被引量：1
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作者 Liang Yao Kang Hong-bo +4 位作者 Liu Yue Chen wen Sun Yan Ma Li Zhao Yan-Wei 《Applied Geophysics》 SCIE CSCD 2025年第3期796-803,896,共8页
Rotary steering systems(RSSs)have been increasingly used to develop horizontal wells.A static push-the-bit RSS uses three hydraulic modules with varying degrees of expansion and contraction to achieve changes in the p... Rotary steering systems(RSSs)have been increasingly used to develop horizontal wells.A static push-the-bit RSS uses three hydraulic modules with varying degrees of expansion and contraction to achieve changes in the pushing force acting on the wellbore in different sizes and directions within a circular range,ultimately allowing the wellbore trajectory to be drilled in a predetermined direction.By analyzing its mathematical principles and the actual characteristics of the instrument,a vector force closed-loop control method,including steering and holding modes,was designed.The adjustment criteria for the three hydraulic modules are determined to achieve rapid adjustment of the vector force.The theoretical feasibility of the developed method was verified by comparing its results with the on-site application data of an imported rotary guidance system. 展开更多
关键词 Static push-the-bit hydraulic modules closed-loop control vector force working mode
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A three-stage series model predictive torque and flux control system based on fast optimal voltage vector selection for more electric aircraft 认领 引用
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作者 Zhaoyang FU Lixian PENG +2 位作者 Shuangrui PING Lefei GE Weilin LI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第11期315-328,共14页
With the development of More Electric Aircraft(MEA),the Permanent Magnet Synchronous Motor(PMSM)is widely used in the MEA field.The PMSM control system of MEA needs to consider the system reliability,and the inverter ... With the development of More Electric Aircraft(MEA),the Permanent Magnet Synchronous Motor(PMSM)is widely used in the MEA field.The PMSM control system of MEA needs to consider the system reliability,and the inverter switching frequency of the inverter is one of the impacting factors.At the same time,the control accuracy of the system also needs to be considered,and the torque ripple and flux ripple are usually considered to be its important indexes.This paper proposes a three-stage series Model Predictive Torque and Flux Control system(three-stage series MPTFC)based on fast optimal voltage vector selection to reduce switching frequency and suppress torque ripple and flux ripple.Firstly,the analytical model of the PMSM is established and the multi-stage series control method is used to reduce the switching frequency.Secondly,selectable voltage vectors are extended from 8 to 26 and a fast selection method for optimal voltage vector sectors is designed based on the hysteresis comparator,which can suppress the torque ripple and flux ripple to improve the control accuracy.Thirdly,a three-stage series control is obtained by expanding the two-stage series control using the P-Q torque decomposition theory.Finally,a model predictive torque and flux control experimental platform is built,and the feasibility and effectiveness of this method are verified through comparison experiments. 展开更多
关键词 Fast optimal voltage vector selection Model predictive control Permanent magnet synchronous motor Ripple suppression Switching frequency
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Virtual flight test for three-axis decoupling fluidic flight control of tailless flying wing 认领 引用
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作者 Liu ZHANG Meng HE 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第4期148-161,共14页
In order to enhance the omnidirectional stealth and maneuvering control capability of tailless flying wings,the fluidic flight attitude control scheme that combines Fluidic Thrust Vectoring(FTV)yaw control and longitu... In order to enhance the omnidirectional stealth and maneuvering control capability of tailless flying wings,the fluidic flight attitude control scheme that combines Fluidic Thrust Vectoring(FTV)yaw control and longitudinal and lateral Circulation Control(CC)is proposed to realize three-axis moment decoupling control.Constrained by the mass flow rate of 30 kgf(1 kgf=9.8 N)thrust turbojet engine bleed air,the equivalent rudder deflection control variables of mass flow combination and jet pressure ratio are proposed respectively by adopting the circulation actuator design of co-directional FTV nozzle and convergent nozzle+backstep.A control model is established to form a 10-channel jet actuation system scheme,and is integrated with the flight control system of a tailless flying wing with a wingspan of 4 m and a medium aspect ratio of 100 kg to realize three-axis attitude closed-loop control based on fluidic flight control.Through wind tunnel force measurement and powered virtual flight test at 35 m/s wind speed,the control characteristics and effectiveness of CC and the attitude control performance of fluidic flight control are quantitatively studied.The results show that the incremental range of pitch moment coefficient generated by the jet with a mass flow rate of 37 g/s of the jet elevator is-0.01812 to 0.01848,and the CC efficiency is greater than 30;the incremental range of roll moment coefficient generated by the jet with a mass flow rate of 34 g/s of the jet aileron is-0.01485 to 0.01358;the fluidic flight control scheme based on compressor bleed air is first used to realize the fluidic flight of tailless flying wing with three-axis attitude control decoupling,at a maximum pitch rate of 19.2(°)/s,a roll rate of 13.8(°)/s,and a yaw rate of 5.4(°)/s;the constructed 10-channel jet actuation system and gas supply pipeline have good robustness and anti-interference characteristics. 展开更多
关键词 Circulation control Control model Flight test Fluidic flight control Fluidic thrust vectoring Tailless flying wing
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Jet Vectoring Control Using a Novel Synthetic Jet Actuator 认领 引用 被引量：18
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作者 LUO Zhen-bing XIA Zhi-xun XIE Yong-gao 《Chinese Journal of Aeronautics》 SCIE EI CAS 2007年第3期193-201,共9页
A primary air jet vectoring control system with a novel synthetic jet actuator(SJA)is presented and simulated numerically.The results show that,in comparison with an existing traditional synthetic jet actuator,which i... A primary air jet vectoring control system with a novel synthetic jet actuator(SJA)is presented and simulated numerically.The results show that,in comparison with an existing traditional synthetic jet actuator,which is able to perform the duty of either"push"or"pull",one novel synthetic jet actuator can fulfill both"push"and"pull"functions to vector the primary jet by shifting a slide block inside it.Therefore,because the new actuator possesses greater efficiency,it has potentiality to replace the existing one in various appli-cations,such as thrust vectoring and the reduction of thermal signature.Moreover,as the novel actuator can fulfill those functions that the existing one can not,it may well be expected to popularize it into more flow control systems. 展开更多
关键词 jet vectoring control synthetic jet actuator slide block flow control
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Nonlinear Model Predictive Control Based on Support Vector Machine with Multi-kernel 认领 引用 被引量：25
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作者 包哲静 皮道映 孙优贤 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2007年第5期691-697,共7页
Multi-kernel-based support vector machine （SVM） model structure of nonlinear systems and its specific identification method is proposed, which is composed of a SVM with linear kernel function followed in series by a... Multi-kernel-based support vector machine （SVM） model structure of nonlinear systems and its specific identification method is proposed, which is composed of a SVM with linear kernel function followed in series by a SVM with spline kernel function. With the help of this model, nonlinear model predictive control can be transformed to linear model predictive control, and consequently a unified analytical solution of optimal input of multi-step-ahead predictive control is possible to derive. This algorithm does not require online iterative optimization in order to be suitable for real-time control with less calculation. The simulation results of pH neutralization process and CSTR reactor show the effectiveness and advantages of the presented algorithm. 展开更多
关键词 nonlinear model predictive control support vector machine with multi-kernel nonlinear system identification kernel function
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Novel Control Vector Parameterization Method with Differential Evolution Algorithm and Its Application in Dynamic Optimization of Chemical Processes 认领 引用 被引量：7
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作者 孙帆 钟伟民 +1 位作者 程辉 钱锋 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第1期64-71,共8页
Two general approaches are adopted in solving dynamic optimization problems in chemical processes, namely, the analytical and numerical methods. The numerical method, which is based on heuristic algorithms, has been w... Two general approaches are adopted in solving dynamic optimization problems in chemical processes, namely, the analytical and numerical methods. The numerical method, which is based on heuristic algorithms, has been widely used. An approach that combines differential evolution （DE） algorithm and control vector parameteri- zation （CVP） is proposed in this paper. In the proposed CVP, control variables are approximated with polynomials based on state variables and time in the entire time interval. Region reduction strategy is used in DE to reduce the width of the search region, which improves the computing efficiency. The results of the case studies demonstrate the feasibility and efficiency of the oroposed methods. 展开更多
关键词 control vector pararneterization differential evolution algorithm dynamic optimization chemical processes
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Experimental investigation and numerical analysis on high-efficiency shock vectoring control serpentine nozzles 认领 引用 被引量：2
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作者 Zhonghao HUI Jingwei SHI +3 位作者 Wentao LIN Li ZHOU Zhanxue WANG Yongquan LIU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第12期296-324,共29页
The high-efficiency Shock Vectoring Control Serpentine Nozzle(SVCSN)takes into account both thrust vectoring and infrared stealth,and significantly improves the comprehensive performance of the aero-engines through an... The high-efficiency Shock Vectoring Control Serpentine Nozzle(SVCSN)takes into account both thrust vectoring and infrared stealth,and significantly improves the comprehensive performance of the aero-engines through an additional auxiliary duct.In this paper,the schlieren photographs at the exit of the high-efficiency SVCSN and the wall static pressure distributions were obtained by experiments,and the numerical results were used to enrich the thrust vectoring characteristics.The effects of the auxiliary injection were analyzed first to reveal the advantages of the high-efficiency SVCSN compared to the conventional SVCSN.Then,the aerodynamic parameters and the structural parameters of the high-efficiency SVCSN were investigated,including the Nozzle Pressure Ratio(NPR),the Secondary flow Pressure Ratio(SPR),the secondary flow relative area and the secondary flow injection angle.Finally,the coupling performance of the high-efficiency SVCSN is studied by using the approximate modeling technology.Results show that the auxiliary injection increases the range between the two shock legs of the “k”shock wave induced by the secondary flow,then causes the separation zone and high-pressure boss of the down wall to expand upstream,and finally results in a prominent increase in the thrust vectoring performance.The thrust vectoring angle and Vectoring Efficiency(VE)of the high-efficiency SVCSN are about 61.6%and 75.7%,respectively,higher than those of the conventional SVCSN at NPR=6.The effects of the NPR and the SPR on the thrust vectoring performance of the high-efficiency SVCSN are coupled with each other.A larger NPR matched with a smaller SPR shows better thrust vectoring performance.The maximum fluctuations in thrust vectoring angle and VE caused by the NPR and SPR are about 22%and 64%.The VE decreases monotonously with the increase of the secondary flow relative area.Smaller secondary flow injection angle shows better thrust vector performance,and the thrust vectoring angle and VE of the secondary flow injection angle of 90are about 20%higher than those of the secondary flow injection angle of 110at NPR=6.Therefore,the secondary flow relative area of 0.06 and the secondary flow injection angle of 90are recommended. 展开更多
关键词 Shock vectoring control Serpentine nozzle Auxiliary injection Thrust vectoring performance Flow control
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Adaptive Nonlinear Model Predictive Control Using an On-line Support Vector Regression Updating Strategy 认领 引用 被引量：3
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作者 王平 杨朝合 +1 位作者 田学民 黄德先 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第7期774-781,共8页
The performance of data-driven models relies heavily on the amount and quality of training samples, so it might deteriorate significantly in the regions where samples are scarce. The objective of this paper is to deve... The performance of data-driven models relies heavily on the amount and quality of training samples, so it might deteriorate significantly in the regions where samples are scarce. The objective of this paper is to develop an online SVR model updating strategy to track the change in the process characteristics efficiently with affordable computational burden. This is achieved by adding a new sample that violates the Karush–Kuhn–Tucker conditions of the existing SVR model and by deleting the old sample that has the maximum distance with respect to the newly added sample in feature space. The benefits offered by such an updating strategy are exploited to develop an adaptive model-based control scheme, where model updating and control task perform alternately.The effectiveness of the adaptive controller is demonstrated by simulation study on a continuous stirred tank reactor. The results reveal that the adaptive MPC scheme outperforms its non-adaptive counterpart for largemagnitude set point changes and variations in process parameters. 展开更多
关键词 Adaptive control Support vector regression Updating strategy Model predictive control
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Genetic algorithm tuned PI controller on PMSM simplified vector control 认领 引用 被引量：13
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作者 WIBOWO Wahyu Kunto JEONG Seok-kwon 《Journal of Central South University》 SCIE EI CAS 2013年第11期3042-3048,共7页
A simple control structure in servo system is occasionally needed for simple industrial application which precise and high control performance is not exessively important so that the cost production can be reduced eff... A simple control structure in servo system is occasionally needed for simple industrial application which precise and high control performance is not exessively important so that the cost production can be reduced efficiently. Simplified vector control, which has simple control structure, is utilized as the permanent magnet synchronous motor control algorithm and genetic algorithm is used to tune three PI controllers used in simplified vector control. The control performance is obtained from simulation and investigated to verify the feasibility of the algorithm to be applied in the real application. Simulation results show that the speed and torque responses of the system in both continuous time and discrete time can achieve good performances. Furthermore, simplified vector control combined with genetic algorithm has a similar perfofmance with conventional field oriented control algorithm and possible to be realized into the real simple application in the future. 展开更多
关键词 simplified vector control conventional field oriented control permanent magnet synchronous motor genetic algorithm PI controller
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Vector deflection stability control of aero-engine based on linear active disturbance rejection 认领 引用 被引量：5
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作者 Changpeng CAI Yerong PENG +1 位作者 Qiangang ZHENG Haibo ZHANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2022年第8期221-235,共15页
Aimed at the problem of instability in engine control caused by vector deflection in experiment of turbofan engines with Axisymmetric Vectoring Exhaust Nozzle(AVEN),a vector deflection stability control method of aero... Aimed at the problem of instability in engine control caused by vector deflection in experiment of turbofan engines with Axisymmetric Vectoring Exhaust Nozzle(AVEN),a vector deflection stability control method of aero-engine based on Linear Active Disturbance Rejection Control(LADRC)is proposed.Firstly,based on CFD numerical simulation,aerodynamic performance model of AVEN is established,and the aerodynamic load change rule of the nozzle throat area actuator during vector deflection is revealed.Subsequently,the integrated model of AVEN/-turbofan engine is established by Simulink/AMESim co-simulation.Finally,the nozzle throat area control loop based on LADRC is designed.The simulation results show that the integrated model can reflect the influence of vector deflection on the stability of the control system.The accuracy comparison between the fan rotor speed and the test data during vector deflection is larger than 1%,indicating a high degree of confidence.Compared with the conventional PID control,the designed LADRC control loop reduces the speed of the low-pressure rotor during vector deflection by 70%,which effectively improves the control stability of the vector deflection.Meanwhile,the fuel flow ratechange during the vector deflection process is smaller and more economical,which provides an important reference for engineering applications. 展开更多
关键词 Actuator load variation Axisymmetric Vectoring Exhaust Nozzle(AVEN) Engine performance Linear Active Disturbance Rejection Control(LADRC) Vector deflection
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Design and Development of a Vector Control System of Induction Motor Based on Dual CPU for Electric Vehicle 认领 引用 被引量：2
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作者 孙逢春 翟丽 +1 位作者 张承宁 彭连云 《Journal of Beijing Institute of Technology》 EI CAS 2003年第3期290-295,共6页
A vector control system for electric vehicle (EV) induction motor drive system is designed and developed. Its hardware system based on dual CPU(microcomputer 80C196KC and DSP TMS320F2407) is implemented. The fundament... A vector control system for electric vehicle (EV) induction motor drive system is designed and developed. Its hardware system based on dual CPU(microcomputer 80C196KC and DSP TMS320F2407) is implemented. The fundamental mathematics equations of induction motor in the general synchronously rotating reference frame ( M T frame) used for vector control are achieved by coordinate transformation. Rotor flux equation and torque equation are deduced. According to these equations, an induction motor mathematical model and rotor flux observer model are built separately. The rotor flux field oriented vector control method is implemented based on these models in system software, some of the simulation results with Matab/Simulink are given. The simulation results show that the vector control system for EV induction motor drive system has better static and dynamic performance, and the rotor flux field oriented vector control method was practically verified. 展开更多
关键词 vector control induction motor electric vehicle
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Learning control of nonhonolomic robot based on support vector machine 认领 引用 被引量：2
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作者 冯勇 葛运建 +1 位作者 曹会彬 孙玉香 《Journal of Central South University》 SCIE EI CAS 2012年第12期3400-3406,共7页
A learning controller of nonhonolomic robot in real-time based on support vector machine(SVM)is presented.The controller includes two parts:one is kinematic controller based on nonlinear law,and the other is dynamic c... A learning controller of nonhonolomic robot in real-time based on support vector machine(SVM)is presented.The controller includes two parts:one is kinematic controller based on nonlinear law,and the other is dynamic controller based on SVM.The kinematic controller is aimed to provide desired velocity which can make the steering system stable.The dynamic controller is aimed to transform the desired velocity to control torque.The parameters of the dynamic system of the robot are estimated through SVM learning algorithm according to the training data of sliding windows in real time.The proposed controller can adapt to the changes in the robot model and uncertainties in the environment.Compared with artificial neural network(ANN)controller,SVM controller can converge to the reference trajectory more quickly and the tracking error is smaller.The simulation results verify the effectiveness of the method proposed. 展开更多
关键词 nonhonolomic robot learning control support vector machine nonlinear control law dynamic control
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Nonlinear decoupling controller design based on least squares support vector regression 认领 引用 被引量：3
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作者 文香军 张雨浓 +1 位作者 阎威武 许晓鸣 《Journal of Zhejiang University-SCIENCE A》 EI CAS 2006年第2期275-284,共10页
Support Vector Machines (SVMs) have been widely used in pattern recognition and have also drawn considerable interest in control areas. Based on a method of least squares SVM (LS-SVM) for multivariate function estimat... Support Vector Machines (SVMs) have been widely used in pattern recognition and have also drawn considerable interest in control areas. Based on a method of least squares SVM (LS-SVM) for multivariate function estimation, a generalized inverse system is developed for the linearization and decoupling control of a general nonlinear continuous system. The approach of inverse modelling via LS-SVM and parameters optimization using the Bayesian evidence framework is discussed in detail. In this paper, complex high-order nonlinear system is decoupled into a number of pseudo-linear Single Input Single Output (SISO) subsystems with linear dynamic components. The poles of pseudo-linear subsystems can be configured to desired positions. The proposed method provides an effective alternative to the controller design of plants whose accurate mathematical model is un- known or state variables are difficult or impossible to measure. Simulation results showed the efficacy of the method. 展开更多
关键词 Support Vector Machine （SVM） Decoupling control Nonlinear system Generalized inverse system
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Flatness intelligent control via improved least squares support vector regression algorithm 认领 引用 被引量：2
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作者 张秀玲 张少宇 +1 位作者 赵文保 徐腾 《Journal of Central South University》 SCIE EI CAS 2013年第3期688-695,共8页
To overcome the disadvantage that the standard least squares support vector regression(LS-SVR) algorithm is not suitable to multiple-input multiple-output(MIMO) system modelling directly,an improved LS-SVR algorithm w... To overcome the disadvantage that the standard least squares support vector regression(LS-SVR) algorithm is not suitable to multiple-input multiple-output(MIMO) system modelling directly,an improved LS-SVR algorithm which was defined as multi-output least squares support vector regression(MLSSVR) was put forward by adding samples' absolute errors in objective function and applied to flatness intelligent control.To solve the poor-precision problem of the control scheme based on effective matrix in flatness control,the predictive control was introduced into the control system and the effective matrix-predictive flatness control method was proposed by combining the merits of the two methods.Simulation experiment was conducted on 900HC reversible cold roll.The performance of effective matrix method and the effective matrix-predictive control method were compared,and the results demonstrate the validity of the effective matrix-predictive control method. 展开更多
关键词 least squares support vector regression multi-output least squares support vector regression flatness effective matrix predictive control
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New adaptive vector control methods for induction motors with simpler structure and better performance 认领 引用 被引量：1
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作者 Kang-Zhi LIU Masashi YOKOO +1 位作者 Keiichiro KONDO Tadanao ZANMA 《Control Theory and Technology》 EI CSCD 2015年第2期173-183,共11页
This paper deals with the vector control, including both the direct vector control(DVC) and the indirect vector control(Id VC),of induction motors. It is well known that the estimation of rotor flux plays a fundamenta... This paper deals with the vector control, including both the direct vector control(DVC) and the indirect vector control(Id VC),of induction motors. It is well known that the estimation of rotor flux plays a fundamental role in the DVC and the estimation of rotor resistance is vital in the slip compensation of the Id VC. In these estimations, the precision is significantly affected by the motor resistances. Therefore, online estimation of motor resistances is indispensable in practice.For a fast estimation of motor resistances, it is necessary to slow down the convergence rate of the current estimate. On the other hand, for a fast estimation of the rotor flux, it is necessary to speed up its convergence rate. It is very difficult to realize such a trade-off in convergence rates in a full order observer.In this paper, we propose to decouple the current observer from the flux observer so as to realize independent convergence rates. Then, the resistance estimation algorithm is applied to both DVC and Id VC. In particular, in the application to Id VC the flux observer needs not be used, which leads to a simpler structure. Meanwhile, independent convergence rates of current observer and flux observer yield an improved performance. A superior performance in the torque and flux responses in both cases is verified by numerous simulations. 展开更多
关键词 Induction motor current observer flux observer parameter adaptation indirect vector control direct vector control
End-point dynamic control of basic oxygen furnace steelmaking based on improved unconstrained twin support vector regression 认领 引用 被引量：1
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作者 Chuang Gao Ming-gang Shen +2 位作者 Xiao-ping Liu Nan-nan Zhao Mao-xiang Chu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2020年第1期42-54,共13页
In order to improve the end-point hit rate of basic oxygen furnace steelmaking,a novel dynamic control model was proposed based on an improved twin support vector regression algorithm.The controlled objects were the e... In order to improve the end-point hit rate of basic oxygen furnace steelmaking,a novel dynamic control model was proposed based on an improved twin support vector regression algorithm.The controlled objects were the end-point carbon content and temperature.The proposed control model was established by using the low carbon steel samples collected from a steel plant,which consists of two prediction models,a preprocess model,two regulation units,a controller and a basic oxygen furnace.The test results of 100 heats show that the prediction models can achieve a double hit rate of 90%within the error bound of 0.005 wt.%C and 15℃.The preprocess model was used to predict an initial end-blow oxygen volume.However,the double hit rate of the carbon con tent and temperature only achieves 65%.Then,the oxygen volume and coolant additi ons were adjusted by the regulation units to improve the hit rate.Finally,the double hit rate after the regulation is reached up to 90%.The results indicate that the proposed dynamic control model is efficient to guide the real production for low carbon steel,and the modeling method is also suitable for the applications of other steel grades. 展开更多
关键词 Steelmaking Basic oxygen furnace End-point control Twin support vector regression Wavelet transform
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Robustly stable model predictive control based on parallel support vector machines with linear kernel 认领 引用 被引量：4
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作者 包哲静 钟伟民 +1 位作者 皮道映 孙优贤 《Journal of Central South University of Technology》 2007年第5期701-707,共7页
Robustly stable multi-step-ahead model predictive control (MPC) based on parallel support vector machines (SVMs) with linear kernel was proposed. First, an analytical solution of optimal control laws of parallel SVMs ... Robustly stable multi-step-ahead model predictive control (MPC) based on parallel support vector machines (SVMs) with linear kernel was proposed. First, an analytical solution of optimal control laws of parallel SVMs based MPC was derived, and then the necessary and sufficient stability condition for MPC closed loop was given according to SVM model, and finally a method of judging the discrepancy between SVM model and the actual plant was presented, and consequently the constraint sets, which can guarantee that the stability condition is still robust for model/plant mismatch within some given bounds, were obtained by applying small-gain theorem. Simulation experiments show the proposed stability condition and robust constraint sets can provide a convenient way of adjusting controller parameters to ensure a closed-loop with larger stable margin. 展开更多
关键词 parallel support vector machines model predictive control stability robustness
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Support vector machine based nonlinear model multi-step-ahead optimizing predictive control 认领 引用 被引量：10
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作者 钟伟民 皮道映 孙优贤 《Journal of Central South University of Technology》 2005年第5期591-595,共5页
A support vector machine with guadratic polynomial kernel function based nonlinear model multi-step-ahead optimizing predictive controller was presented. A support vector machine based predictive model was established... A support vector machine with guadratic polynomial kernel function based nonlinear model multi-step-ahead optimizing predictive controller was presented. A support vector machine based predictive model was established by black-box identification. And a quadratic objective function with receding horizon was selected to obtain the controller output. By solving a nonlinear optimization problem with equality constraint of model output and boundary constraint of controller output using Nelder-Mead simplex direct search method, a sub-optimal control law was achieved in feature space. The effect of the controller was demonstrated on a recognized benchmark problem and a continuous-stirred tank reactor. The simulation results show that the multi-step-ahead predictive controller can be well applied to nonlinear system, with better performance in following reference trajectory and disturbance-rejection. 展开更多
关键词 nonlinear model predictive control support vector machine nonlinear system identification kernel function nonlinear optimization
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