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Impact of Skin Temperature Control Variable on the Assimilation of Microwave Temperature-sounding Channels in Regional Numerical Weather Prediction 认领 引用 被引量：1
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作者 Yaodeng CHEN Qihang YANG +3 位作者 Luyao QIN Yuanbing WANG Deming MENG Xusheng YAN 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2025年第3期564-578,共15页
Accurate skin temperature is one of the critical factors in successfully assimilating satellite radiance data over land.However,model-simulated skin temperature may not be accurate enough.To address this issue,an exte... Accurate skin temperature is one of the critical factors in successfully assimilating satellite radiance data over land.However,model-simulated skin temperature may not be accurate enough.To address this issue,an extended skin temperature control variable(TSCV) approach is proposed in a variational assimilation framework,which also considers the background error correlation between skin temperature and atmospheric variables.A series of single observation tests and a 10-day cycling assimilation experiment were conducted to evaluate the impact of the TSCV approach on the assimilation of AMSU-A and ATMS(Advanced Technology Microwave Sounder) microwave temperature-sounding channels over land.The results of the single observation tests show that by applying the TSCV approach,not only the direct analysis of skin temperature is realized,but also the interaction between skin temperature and atmospheric variables can be achieved during the assimilation process.The results of the cycling experiment demonstrate that the TSCV approach improves the skin temperature analysis,which in turn reduces the RMSE of the surface variables and low-level air temperature forecasts.The TSCV approach also reduces the difference between the observed and simulated brightness temperatures of both microwave and infrared window channels over land,suggesting that the approach can facilitate the radiance simulation of these channels,thus contributing to the assimilation of window channels. 展开更多
关键词 radiance assimilation skin temperature control variable microwave temperature-sounding numerical weather prediction
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Evaluation of Two Momentum Control Variable Schemes and Their Impact on the Variational Assimilation of Radar Wind Data:Case Study of a Squall Line 认领 引用 被引量：12
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作者 Xin LI Mingjian ZENG +3 位作者 Yuan WANG Wenlan WANG Haiying WU Haixia MEI 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2016年第10期1143-1157,共15页
Different choices of control variables in variational assimilation can bring about different influences on the analyzed atmospheric state. Based on the WRF model＇s three-dimensional variational assimilation system, t... Different choices of control variables in variational assimilation can bring about different influences on the analyzed atmospheric state. Based on the WRF model＇s three-dimensional variational assimilation system, this study compares the be- havior of two momentum control variable options-streamfunction velocity potential （ψ-χ） and horizontal wind components （U-V）-in radar wind data assimilation for a squall line case that occurred in Jiangsu Province on 24 August 2014. The wind increment from the single observation test shows that the ψ-χ control variable scheme produces negative increments in the neighborhood around the observation point because streamfunction and velocity potential preserve integrals of velocity. On the contrary, the U-V control variable scheme objectively reflects the information of the observation itself. Furthermore, radial velocity data from 17 Doppler radars in eastern China are assimilated. As compared to the impact of conventional observation, the assimilation of radar radial velocity based on the U-V control variable scheme significantly improves the mesoscale dynamic field in the initial condition. The enhanced low-level jet stream, water vapor convergence and low-level wind shear result in better squall line forecasting. However, the ψ-χ control variable scheme generates a discontinuous wind field and unrealistic convergence/divergence in the analyzed field, which lead to a degraded precipitation forecast. 展开更多
关键词 three-dimensional variational assimilation momentum control variable Doppler radar data squall line
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Background Error Covariance Statistics of Hydrometeor Control Variables Based on Gaussian Transform 认领 引用 被引量：1
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作者 Tao SUN Yaodeng CHEN +1 位作者 Deming MENG Haiqin CHEN 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2021年第5期831-844,共14页
Use of data assimilation to initialize hydrometeors plays a vital role in numerical weather prediction(NWP).To directly analyze hydrometeors in data assimilation systems from cloud-sensitive observations,hydrometeor c... Use of data assimilation to initialize hydrometeors plays a vital role in numerical weather prediction(NWP).To directly analyze hydrometeors in data assimilation systems from cloud-sensitive observations,hydrometeor control variables are necessary.Common data assimilation systems theoretically require that the probability density functions(PDFs)of analysis,background,and observation errors should satisfy the Gaussian unbiased assumptions.In this study,a Gaussian transform method is proposed to transform hydrometeors to more Gaussian variables,which is modified from the Softmax function and renamed as Quasi-Softmax transform.The Quasi-Softmax transform method then is compared to the original hydrometeor mixing ratios and their logarithmic transform and Softmax transform.The spatial distribution,the non-Gaussian nature of the background errors,and the characteristics of the background errors of hydrometeors in each method are studied.Compared to the logarithmic and Softmax transform,the Quasi-Softmax method keeps the vertical distribution of the original hydrometeor mixing ratios to the greatest extent.The results of the D′Agostino test show that the hydrometeors transformed by the Quasi-Softmax method are more Gaussian when compared to the other methods.The Gaussian transform has been added to the control variable transform to estimate the background error covariances.Results show that the characteristics of the hydrometeor background errors are reasonable for the Quasi-Softmax method.The transformed hydrometeors using the Quasi-Softmax transform meet the Gaussian unbiased assumptions of the data assimilation system,and are promising control variables for data assimilation systems. 展开更多
关键词 hydrometeors control variables data assimilation background error covariance Gaussian transform
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Efficient Electrical Discharge Machining of Titanium Alloy by Multiple Variable Adaptive Control System 认领 引用
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作者 Xin Mu Ming Zhou Jun Zhang 《Journal of Harbin Institute of Technology(New Series)》 CAS 2026年第2期31-43,共13页
In electrical discharge machining of titanium alloys,the1400-1600℃melting points of titanium alloysr equire the input of sufficient discharge energy to melt and vaporize the titanium alloy.However,because of low ther... In electrical discharge machining of titanium alloys,the1400-1600℃melting points of titanium alloysr equire the input of sufficient discharge energy to melt and vaporize the titanium alloy.However,because of low thermo-c onduction,the input energy can easily raise the temperature of the gap liquid to a high enough level.Usually,thee levated temperature of the gap liquid resulted in a reduction of the gap breakdown strength,so that the liquid dielectricd eionization after pulse discharging tends to be incomplete and causes occurrences of large arcing pulses,burning thew orkpiece surface and causing electrode wear.This contradiction hinders the machining of titanium alloy by Electrical Discharge Machining(EDM).To solve this issue,this study thoroughly analyzed the factors influencing gap liquidb reakdown strength during EDM and identified two key elements:gap distance and amount of chips left in gap.Based ont his analysis,a solution was proposed,which involved the development of a multiple variable adaptive control system.T his system adjusted the gap servo voltage in proportion to the gap distance to control the discharge types of pulses,r egulated the electrode discharge time to the quantity of chips left in the gap in an electrode discharge time.By dynamically adjusting these two variables,the system maintained an optimal liquid breakdown strength,facilitatinge ffective machining while preventing arcing in machining.Experimental validation confirmed that this multiple variable control system significantly enhanced the EDM process for titanium alloys,even under challenging conditions,d emonstrating its practical utility. 展开更多
关键词 electrical discharge machining adaptive control titanium alloy multiple variable control
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A Fuzzy Variable Admittance Control Strategy Based on Bilateral Motion Intention for Upper Limb Rehabilitation Exoskeleton 认领 引用
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作者 Peimin Xie Zeyu Lin Longhan Xie 《Journal of Bionic Engineering》 SCIE EI CSCD 2026年第3期1551-1570,共20页
Bilateral robotic training offers a promising solution for upper-limb motor recovery;however,conventional Mirror Therapy(MT)systems typically provide fixed assistance and rely solely on the motion of the unimpaired li... Bilateral robotic training offers a promising solution for upper-limb motor recovery;however,conventional Mirror Therapy(MT)systems typically provide fixed assistance and rely solely on the motion of the unimpaired limb.This paper presents a bilateral intention-driven control strategy for an upper-limb rehabilitation exoskeleton that fuses motor intentions from both the healthy and affected arms.By integrating inertial signals,surface Electromyography(sEMG),and interaction torque,the system employs a fuzzy variable admittance controller combined with sliding mode control to generate adaptive assistive torque that reflects the user’s physical engagement.Experiments involving 4 healthy participants and 11 post-stroke patients were conducted under three control conditions:no interlimb coupling,fixed admittance,and variable admittance.Compared to fixed-parameter control,the proposed variable admittance strategy improved bilateral coordination by 18.6%,reduced interlimb motion lag from 1.19 s to 0.54 s,enhanced intention consistency by 18.33%,and increased average interaction torque by 23.13%.These results demonstrate that combining bilateral intention fusion with adaptive admittance control can significantly enhance movement synchronization and voluntary engagement,offering a promising control paradigm to enhance patient engagement and motion coordination for rehabilitation robotics. 展开更多
关键词 Bilateral intention fusion Variable admittance control Upper limb exoskeleton Mirror Therapy
Multivariable Control Performance Assessment Based on Generalized Minimum Variance Benchmark 认领 引用 被引量：14
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作者 赵宇 苏宏业 +1 位作者 褚健 古勇 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2010年第1期86-94,共9页
This paper is concerned with the control performance assessment based on the multivariable generalized minimum variance benchmark.An explicit expression for the feedback controller-invariant(the generalized minimum va... This paper is concerned with the control performance assessment based on the multivariable generalized minimum variance benchmark.An explicit expression for the feedback controller-invariant(the generalized minimum variance)term of the multivariable control system is obtained,which is used as a standard benchmark for the assessment of the control performance for multi input multi output(MIMO)process.The proposed approach is based on the multivariable minimum variance benchmark.In comparison with the minimum variance benchmark, the developed method is more reasonable and practical for the control performance assessment of multivariable systems.The approach is illustrated by a simulation example and an industrial application. 展开更多
关键词 control performance assessment generalized minimum variance minimum variance control multi- variable control system
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Variable Structure Control of Catastrophic Course in Airdropping Heavy Cargo 认领 引用 被引量：33
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作者 Zhang Huiyuan Shi Zhongke 《Chinese Journal of Aeronautics》 SCIE EI CAS 2009年第5期520-527,共8页
The mathematical model of a transport aircraft would be subjected to a sudden change when heavy cargo is dropped off in airdropping,which exerts serious influences upon the safety of the aircraft.A variable structure ... The mathematical model of a transport aircraft would be subjected to a sudden change when heavy cargo is dropped off in airdropping,which exerts serious influences upon the safety of the aircraft.A variable structure controller is specially designed for handling the airdrop process.The nonlinear system is linearized by input-output feedback linearization using differential geometry theories.On this basis,an inner loop system for velocity and attitude tracking control is designed by using the exponentially approaching rule of the variable structure theory.The whole flight control system is integrated with the outer loop flight altitude control.Digital simulation evidences the applicability of the system to potentially catastrophic course in airdropping heavy cargo and provides robustness against system parameter perturbation. 展开更多
关键词 flight control airdrop nonlinear control system variable structure control feedback linearization sliding mode control
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Adaptive variable structure control based on backstepping for spacecraft with reaction wheels during attitude maneuver 认领 引用 被引量：7
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作者 宋斌 马广富 李传江 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2009年第1期138-144,共7页
An adaptive variable structure control method based on backstepping is proposed for the attitude maneuver problem of rigid spacecraft with reaction wheel dynamics in the presence of uncertain inertia matrix and extern... An adaptive variable structure control method based on backstepping is proposed for the attitude maneuver problem of rigid spacecraft with reaction wheel dynamics in the presence of uncertain inertia matrix and external disturbances. The proposed control approach is a combination of the backstepping and the adaptive variable structure control. The cascaded structure of the attitude maneuver control system with reaction wheel dynamics gives the advantage for applying the backstepping method to construct Lyapunov functions. The robust stability to external disturbances and parametric uncertainty is guaranteed by the adaptive variable structure control. To validate the proposed control algorithm, numerical simulations using the proposed approach are performed for the attitude maneuver mission of rigid spacecraft with a configuration consisting of four reaction wheels for actuator and three magnetorquers for momentum unloading. Simulation results verify the effectiveness of the proposed control algorithm. 展开更多
关键词 rigid spacecraft attitude maneuver backstepping variable structure control reaction wheel dynamic
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IMPLICIT ITERATIVE METHODS WITH VARIABLE CONTROL PARAMETERS FOR ILL-POSED OPERATOR EQUATIONS 认领 引用 被引量：3
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作者 贺国强 王新革 刘林先 《Acta Mathematica Scientia》 SCIE 2000年第4期485-494,共10页
This paper discusses a kind of implicit iterative methods with some variable parameters, which are called control parameters, for solving ill-posed operator equations. The theoretical results show that the new methods... This paper discusses a kind of implicit iterative methods with some variable parameters, which are called control parameters, for solving ill-posed operator equations. The theoretical results show that the new methods always lead to optimal convergence rates and have some other important features, especially the methods can be implemented parallelly. 展开更多
关键词 III-posed problems implicit iterative methods variable control parameters parallel algorith?
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Asymptotic Tracking Control for Wind Turbines in Variable Speed Mode 认领 引用 被引量：3
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作者 Wei Lin Zongtao Lu Wei Wei 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2017年第3期569-576,共8页
This paper presents a variable speed control strategy for wind turbines in order to capture maximum wind power.Wind turbines are modeled as a two-mass drive-train system with generator torque control.Based on the obta... This paper presents a variable speed control strategy for wind turbines in order to capture maximum wind power.Wind turbines are modeled as a two-mass drive-train system with generator torque control.Based on the obtained wind turbine model,variable speed control schemes are developed.Nonlinear tracking controllers are designed to achieve asymptotic tracking for a prescribed rotor speed reference signal so as to yield maximum wind power capture.Due to the difficulty of torsional angle measurement,an observer-based control scheme that uses only rotor speed information is further developed for global asymptotic output tracking.The effectiveness of the proposed control methods is illustrated by simulation results. 展开更多
关键词 Asymptotic tracking partial-state and output feedback two-mass drive-train model variable speed control wind turbines
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Adaptive Variable Structure Control of MIMO Nonlinear Systems with Time-varying Delays and Unknown Dead-zones 认领 引用 被引量：9
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作者 Tian-Ping Zhang Cai-Ying Zhou Qing Zhu 《International Journal of Automation and computing》 2009年第2期124-136,共13页
In this paper,adaptive variable structure neural control is presented for a class of uncertain multi-input multi-output(MIMO)nonlinear systems with state time-varying delays and unknown nonlinear dead-zones.The unknow... In this paper,adaptive variable structure neural control is presented for a class of uncertain multi-input multi-output(MIMO)nonlinear systems with state time-varying delays and unknown nonlinear dead-zones.The unknown time-varying delay uncer-tainties are compensated for using appropriate Lyapunov-Krasovskii functionals in the design.The approach removes the assumption of linear function outside the deadband without necessarily constructing a dead-zone inverse as an added contribution.By utilizing the integral-type Lyapunov function and introducing an adaptive compensation term for the upper bound of the residual and optimal approximation error as well as the dead-zone disturbance,the closed-loop control system is proved to be semi-globally uniformly ultimately bounded.In addition,a modified adaptive control algorithm is given in order to avoid the high-frequency chattering phenomenon.Simulation results demonstrate the effectiveness of the approach. 展开更多
关键词 Adaptive control neural networks(NNs) variable structure control dead-zone nonlinear time-varying delay systems.
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Feedforward Variable Structural Proportional-Integral-Derivative for Temperature Control of Polymerase Chain Reaction 认领 引用 被引量：3
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作者 邱宪波 袁景淇 汪志锋 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2006年第2期200-206,共7页
To track the rapidly changing temperature profiles of thermal cycling of polymerase chain reaction （PCR） accurately, an innovative feedforward variable structural proportional-integral-derivative （FVSPID） controll... To track the rapidly changing temperature profiles of thermal cycling of polymerase chain reaction （PCR） accurately, an innovative feedforward variable structural proportional-integral-derivative （FVSPID） controller was developed. Based on the step response test data of the heat block, a reduced first order model was estabfished at different operating points. Based on the reduced model, the FVSPID controller combined a feedforward path with the variable structural proportional-integral-derivative （PID） control. The modified feedforward action provided directly the optimal predictive power for the desired setpoint to speed up the dynamic response. To cooperate with the feedforward action, a variable structural PID was applied, where the P mode was used in the case of the largest errors to speed up response, whereas the PD mode was used in the case of larger errors to suppress overshoot, and finally the PID mode was applied for small error conditions to eliminate the steady state offset. Experimental results illustrated that compared to the conventional PID controller, the FVSPID controller can not only reduce the time taken to complete a standard PCR protocol, but also improve the accuracy of gene amplification. 展开更多
关键词 feedforward variable structural PID controller polymerase chain reaction thermal cycling temperature tracking
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Sliding Mode Variable Structure Control for Visual Servoing System 认领 引用 被引量：10
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作者 Fei Li Hua-Long Xie 《International Journal of Automation and computing》 2010年第3期317-323,共7页
A visual servoing tracking controller is proposed based on the sliding mode control theory in order to achieve strong robustness against parameter variations and external disturbances. A sliding plane with time delay ... A visual servoing tracking controller is proposed based on the sliding mode control theory in order to achieve strong robustness against parameter variations and external disturbances. A sliding plane with time delay compensation is presented by the pre-estimate of states. To reduce the chattering of the sliding mode controller, a modified exponential reaching law and hyperbolic tangent function are applied to the design of visual controller and robot joint controller. Simulation results show that the visual servoing control scheme is robust and has good tracking performance. 展开更多
关键词 Visual servoing sliding mode control variable structure control reaching law time delay.
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Fault detection and accommodation via neural network and variable structure control 认领 引用 被引量：6
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作者 Hao YANG Bin JIANG 《控制理论与应用（英文版）》 2007年第3期253-260,共8页
This paper proposes a novel idea that classifies faults into two different kinds： serious faults and small faults, and treats them with different strategies respectively. A kind of artificial neural network （ANN） i... This paper proposes a novel idea that classifies faults into two different kinds： serious faults and small faults, and treats them with different strategies respectively. A kind of artificial neural network （ANN） is proposed for detecting serious faults, and variable structure （VS） model-following control is constructed for accommodating small faults. The proposed framework takes both advantages of qualitative way and quantitative way of fault detection and accommodation. Moreover, the uncertainty case is investigated and the VS controller is modified. Simulation results of a remotely piloted aircraft with control actuator failures illustrate the performance of the developed algorithm. 展开更多
关键词 Fault detection Fault accommodation Neural network Variable structure control
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Design of Model Following Variable Structure Controller for Three-axle Vehicle 认领 引用 被引量：2
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作者 管西强 张建武 屈求真 《Journal of Donghua University(English Edition)》 EI CAS 2003年第1期100-104,共5页
An optimal control procedure is developed for the front and rear wheels of a three-axle vehicle moving on a complex typical road based on model following variable structure control strategy. The actual vehicle may be ... An optimal control procedure is developed for the front and rear wheels of a three-axle vehicle moving on a complex typical road based on model following variable structure control strategy. The actual vehicle may be considered as an uncertain system. Cornering stiffness of front and rear wheels and external disturbances are varied in a limited range. The model-following variable structure control method is used to control both front and rear wheels steering operations of the vehicle, so that steering responses of the vehicle follow from those of the reference model. By numerical results obtained from computer simulation, it is demonstrated that the control system model can cope with the effects of parameter perturbations and outside disturbances. 展开更多
关键词 Three-axle vehicle Model following control Variable structure control. Uncertain model.
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A Novel Genetic Algorithm and Its Application in Variable Structure Control of Robot 认领 引用 被引量：2
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作者 王建平 许春山 +1 位作者 孙兴进 赵锡芳 《Journal of Shanghai University(English Edition)》 2005年第3期255-260,共6页
A novel genetic algorithm (NGA) is proposed, which possesses micro-regulation and renascence operation. The optimized variable searching interval is regulated gradually according to the sub-group of excellent individu... A novel genetic algorithm (NGA) is proposed, which possesses micro-regulation and renascence operation. The optimized variable searching interval is regulated gradually according to the sub-group of excellent individuals. The NGA is used to optimize the parameters of the variable structure control (VSC), which satisfies the new reaching law and sliding mode. It is used in robot control systems. Simulation results are given. 展开更多
关键词 genetic algorithms variable structure control (VSC) reaching law sliding mode robot.
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Compensation for secondary uncertainty in electro-hydraulic servo system by gain adaptive sliding mode variable structure control 认领 引用 被引量：15
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作者 张友旺 桂卫华 《Journal of Central South University of Technology》 2008年第2期256-263,共8页
Based on consideration of the differential relations between the immeasurable variables and measurable variables in electro-hydraulic servo system,adaptive dynamic recurrent fuzzy neural networks(ADRFNNs) were employe... Based on consideration of the differential relations between the immeasurable variables and measurable variables in electro-hydraulic servo system,adaptive dynamic recurrent fuzzy neural networks(ADRFNNs) were employed to identify the primary uncertainty and the mathematic model of the system was turned into an equivalent linear model with terms of secondary uncertainty.At the same time,gain adaptive sliding mode variable structure control(GASMVSC) was employed to synthesize the control effort.The results show that the unrealization problem caused by some system's immeasurable state variables in traditional fuzzy neural networks(TFNN) taking all state variables as its inputs is overcome.On the other hand,the identification by the ADRFNNs online with high accuracy and the adaptive function of the correction term's gain in the GASMVSC make the system possess strong robustness and improved steady accuracy,and the chattering phenomenon of the control effort is also suppressed effectively. 展开更多
关键词 electro-hydraulic servo system adaptive dynamic recurrent fuzzy neural network（ADRFNN） gain adaptive slidingmode variable structure control（GASMVSC） secondary uncertainty
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Fuzzy variable structure delay control algorithms and their applications to AQM 认领 引用 被引量：1
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作者 王明政 李建华 +1 位作者 张文军 诸鸿文 《Journal of Southeast University(English Edition)》 EI CAS 2004年第3期289-296,共8页
This paper analyzes the fuzzy variable structure control algorithms for delay systems and describes the compensation mechanism of the integral factor to the effect of the delay. Based on the linearized model of the co... This paper analyzes the fuzzy variable structure control algorithms for delay systems and describes the compensation mechanism of the integral factor to the effect of the delay. Based on the linearized model of the congestion-avoidance flow-control mode of transmission control protocol (TCP), we present delay control algorithms for active queue management (AQM) and discuss the parameter tuning of the algorithms. The NS (network simulator) simulation results show that the proposed control scheme for the nonlinear TCP/AQM model has good performance and robustness with respect to the uncertainties of the round-trip time (RTT) and the number of active TCP sessions. Compared to other similar schemes, our algorithms perform better in terms of packet loss ratio, throughput and butter fluctuation. 展开更多
关键词 time delay compensation fuzzy variable structure control active queue management robustness
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Semiactive variable stiffness control for parametric vibration of cables 认领 引用 被引量：1
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作者 李惠 陈文礼 欧进萍 《Earthquake Engineering and Engineering Vibration》 EI 2006年第2期215-222,共8页
In this paper, a semiactive variable stiffness （SVS） device is used to decrease cable oscillations caused by parametric excitation, and the equation of motion of the parametric vibration of the cable with this SVS d... In this paper, a semiactive variable stiffness （SVS） device is used to decrease cable oscillations caused by parametric excitation, and the equation of motion of the parametric vibration of the cable with this SVS device is presented. The ON/OFF control algorithm is used to operate the SVS control device. The vibration response of the cable with the SVS device is numerically studied for a variety of additional stiffness combinations in both the frequency and time domains and for both parametric and classical resonance vibration conditions. The numerical studies further consider the cable sag effect. From the numerical results, it is shown that the SVS device effectively suppresses the cable resonance vibration response, and as the stiffness of the device increases, the device achieves greater suppression of vibration. Moreover, it was shown that the SVS device increases the critical axial displacement of the excitation under cable parametric vibration conditions. 展开更多
关键词 cable semiactive control semiactive variable stiffness control parametric vibration resonance nonlinearity
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VARIABLE STRUCTURE CONTROL APPLIED IN ELECTRO-HYDRAULIC SERVO SYSTEM WITH ANN 认领 引用 被引量：6
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作者 YAO Jianjun WANG Xiancheng +1 位作者 WU Zhenshun HAN Junwei 《Chinese Journal of Mechanical Engineering》 EI CAS 2006年第1期32-36,共5页
The variable structure control （VSC） theory is applied to the electro-hydraulic servo system here. The VSC control law is achieved using Lyapunov method and pole placement. To eliminate the chattering phenomena, a s... The variable structure control （VSC） theory is applied to the electro-hydraulic servo system here. The VSC control law is achieved using Lyapunov method and pole placement. To eliminate the chattering phenomena, a saturation function is adopted. The proposed VSC approach is fairly robust to load disturbance and system parameter variation. Since the distortion. including phase lag and amplitude attenuation occurs in the system sinusoid response, the amplitude and phase control （APC） algorithm, based on Adaline neural network and using LMS algorithm, is developed for distortion cancellation. The APC controller is simple and can on-line adjust, thus it gives accurate tracking. 展开更多
关键词 Variable structure control （VSC） Adaline neural network Pole placement LMS algorithm Amplitude and phase control （APC）
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