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Simplified K-linearization and dispersion compensation method for low-cost real-time serial sectioning-swept source optical coherence tomography 认领 引用 被引量：1
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作者 Wei Chen Lingxuan Meng +2 位作者 Xiuhua Zheng Shuaibin Chang Jianbo Tang 《Journal of Innovative Optical Health Sciences》 SCIE EI CSCD 2026年第3期82-89,共8页
Swept-Source Optical Coherence Tomography(SS-OCT)requires linear k-space sampling and dispersion compensation to achieve optimal axial resolution,typically necessitating expensive,high-speed data acquisition hardware.... Swept-Source Optical Coherence Tomography(SS-OCT)requires linear k-space sampling and dispersion compensation to achieve optimal axial resolution,typically necessitating expensive,high-speed data acquisition hardware.Existing numerical methods are computationally intensive,hindering real-time imaging.While phase linearization offers a simpler alternative,its applicability is limited to shallow depths.Here,we demonstrate that for serial sectioning and imaging,where the region of interest is confined to a few hundred micrometers,phase linearization is highly effective.We developed a simplified workflow that enables real-time reconstruction without added processing time.Using a commercial swept source,we maintained a sharp axial point spread function over a 700μm depth,sufficient for visualizing fine brain structures in mice.Our method allows for video-rate display using cost-effective,low-sampling-rate hardware. 展开更多
关键词 K-linearization dispersion compensation phase linearization
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Fixed-Structure Robust Feedback Linearization for Full Relative Degree Nonlinear Systems 认领 引用
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作者 Vlad Mihaly MirceaȘușcă Petru Dobra 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第10期2026-2039,共14页
The exact feedback linearization method implies an accurate knowledge of the model and its parameters.This assumption is an inherent limitation of the method,suffering from robustness issues.In general,the model struc... The exact feedback linearization method implies an accurate knowledge of the model and its parameters.This assumption is an inherent limitation of the method,suffering from robustness issues.In general,the model structure is only partially known and its parameters present uncertainties.The current paper extends the classical exact feedback linearization to the robust feedback linearization by adding an appropriatelydesigned robust control layer.This is then able to ensure robust stability and robust performance for the given uncertain system in a desired region of attraction.We consider the case of full relative degree input-affine nonlinear systems,which are of great practical importance in the literature.The inner loop contains the feedback linearization input for the nominal system and the resulting residual nonlinearities can always be characterized as inverse additive uncertainties.The constructive proofs provide exact representations of the uncertainty models in three considered scenarios:unmatched,fully-matched,and partially-matched uncertainties.The uncertainty model will be a descriptor system,which also represents one of the novelties of the paper.Our approach leads to a simplified control structure and a less conservative coverage of the uncertainty set compared to current alternatives.The end-to-end procedure is emphasized on an illustrative example,in two different hypotheses. 展开更多
关键词 Feedback linearization nonlinear control robustness uncertain nonlinear systems
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MHD flow of upper-convected Maxwell fluid over porous stretching sheet using successive Taylor series linearization method 认领 引用 被引量：4
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作者 S.S.MOTSA T.HAYAT O.M.ALDOSSARY 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2012年第8期975-990,共16页
This paper investigates the magnetohydrodynamic （MHD） boundary layer flow of an incompressible upper-convected Maxwell （UCM） fluid over a porous stretching surface. Similarity transformations are used to reduce th... This paper investigates the magnetohydrodynamic （MHD） boundary layer flow of an incompressible upper-convected Maxwell （UCM） fluid over a porous stretching surface. Similarity transformations are used to reduce the governing partial differential equations into a kind of nonlinear ordinary differential equations. The nonlinear prob- lem is solved by using the successive Taylor series linearization method （STSLM）. The computations for velocity components are carried out for the emerging parameters. The numerical values of the skin friction coefficient are presented and analyzed for various parameters of interest in the problem. 展开更多
关键词 upper-convected Maxwell （UCM） fluid boundary layer flow successivelinearization method successive Taylor series linearization method （STSLM）
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Impact angle control over composite guidance law based on feedback linearization and finite time control 认领 引用 被引量：9
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作者 ZHANG Xiaojian LIU Mingyong +1 位作者 LI Yang ZHANG Feihu 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2018年第5期1036-1045,共10页
The impact angle control over guidance(IACG) law against stationary targets is proposed by using feedback linearization control(FLC) and finite time control(FTC). First, this paper transforms the kinematics equation o... The impact angle control over guidance(IACG) law against stationary targets is proposed by using feedback linearization control(FLC) and finite time control(FTC). First, this paper transforms the kinematics equation of guidance systems into the feedbackable linearization model, in which the guidance law is obtained without considering the impact angle via FLC. For the purpose of the line of sight(LOS) angle and its rate converging to the desired values, the second-order LOS angle is considered as a double-integral system. Then, this paper utilizes FTC to design a controller which can guarantee the states of the double-integral system converging to the desired values. Numerical simulation illustrates the performance of the IACG, in contrast to the existing guidance law. 展开更多
关键词 guidance law impact angle feedback linearization finite time control global stabilization
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Flutter analysis of an airfoil with nonlinear damping using equivalent linearization 认领 引用 被引量：8
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作者 Chen Feixin Liu Jike Chen Yanmao 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2014年第1期59-64,共6页
The equivalent linearization method （ELM） is modified to investigate the nonlinear flut- ter system of an airfoil with a cubic damping. After obtaining the linearization quantity of the cubic nonlinearity by the ELM... The equivalent linearization method （ELM） is modified to investigate the nonlinear flut- ter system of an airfoil with a cubic damping. After obtaining the linearization quantity of the cubic nonlinearity by the ELM, an equivalent system can be deduced and then investigated by linear flut- ter analysis methods. Different from the routine procedures of the ELM, the frequency rather than the amplitude of limit cycle oscillation （LCO） is chosen as an active increment to produce bifurca- tion charts. Numerical examples show that this modification makes the ELM much more efficient. Meanwhile, the LCOs obtained by the ELM are in good agreement with numerical solutions. The nonlinear damping can delay the occurrence of secondary bifurcation. On the other hand, it has marginal influence on bifurcation characteristics or LCOs. 展开更多
关键词 Airfoil flutter Bifurcation Cubic damping Equivalent linearization Limit cycle oscillation
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Tracking control for air-breathing hypersonic cruise vehicle based on tangent linearization approach 认领 引用 被引量：7
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作者 Guangbin Cai Guangren Duan +1 位作者 Changhua Hu Bin Zhou 《Journal of Systems Engineering and Electronics》 SCIE EI 2010年第3期469-475,共7页
This paper is focused on developing a tracking controller for a hypersonic cruise vehicle using tangent linearization approach.The design of flight control systems for air-breathing hypersonic vehicles is a highly cha... This paper is focused on developing a tracking controller for a hypersonic cruise vehicle using tangent linearization approach.The design of flight control systems for air-breathing hypersonic vehicles is a highly challenging task due to the unique characteristics of the vehicle dynamics.Motivated by recent results on tangent linearization control,the tracking control problem for the hypersonic cruise vehicle is reduced to that of a feedback stabilizing controller design for a linear time-varying system which can be accomplished by a standard design method of frozen-time control.Through a proper model transformation,it can be proven that the tracking error of the designed closed-loop system decays exponentially.Simulation studies are conducted for trimmed cruise conditions of 110000 ft and Mach 15 where the responses of the vehicle to step changes in altitude and velocity are evaluated.The effectiveness of the controller is demonstrated by simulation results. 展开更多
关键词 hypersonic cruise vehicles tangent linearization tracking control nonlinear control.
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Sliding Mode Control of Hydraulic Pressure in Electro-Hydraulic Brake System Based on the Linearization of Higher-Order Model 认领 引用 被引量：3
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作者 Qiping Chen Haoyu Sun +2 位作者 Ning Wang Zhi Niu Rui Wan 《Fluid Dynamics & Materials Processing》 EI 2020年第3期513-524,共12页
The possibility to enhance the stability and robustness of electrohydraulic brake(EHB)systems is considered a subject of great importance in the automotive field.In such a context,the present study focuses on an actua... The possibility to enhance the stability and robustness of electrohydraulic brake(EHB)systems is considered a subject of great importance in the automotive field.In such a context,the present study focuses on an actuator with a four-way sliding valve and a hydraulic cylinder.A 4-order nonlinear mathematical model is introduced accordingly.Through the linearization of the feedback law of the high order EHB model,a sliding mode control method is proposed for the hydraulic pressure.The hydraulic pressure tracking controls are simulated and analyzed by MATLAB/Simulink soft considering separately different conditions,i.e.,a sine wave,a square wave and a square wave with superimposed sine disturbance.The results show that the proposed strategy can track the target within 0.25 s,and the mean observed error is less than 1.2 bar.Moreover,with such a strategy,faster response and less overshoot are possible,which should be regarded as significant advantages. 展开更多
关键词 EHB hydraulic pressure feedback linearization sliding mode control
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Feedback linearization of the nonlinear model of a small-scale helicopter 认领 引用 被引量：7
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作者 Baoquan SONG Yunhui LIU Caizhi FAN 《控制理论与应用（英文版）》 2010年第3期301-308,共8页
In order to design a nonlinear controller for small-scale autonomous helicopters, the dynamic characteristics of a model helicopter are investigated, and an integrated nonlinear model of a small-scale helicopter for h... In order to design a nonlinear controller for small-scale autonomous helicopters, the dynamic characteristics of a model helicopter are investigated, and an integrated nonlinear model of a small-scale helicopter for hovering control is presented. It is proved that the nonlinear system of the small-scale helicopter can be transformed to a linear system using the dynamic feedback linearization technique. Finally, simulations are carried out to validate the nonlinear controller. 展开更多
关键词 Feedback linearization Nonlinear model Model helicopter
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Statistical Linearization on 2 DOFs Hydropneumatic Suspension with Asymmetric Non-linear Stiffness 认领 引用 被引量：2
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作者 DONG Mingming LUO Zhenxing 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2015年第3期504-510,共7页
Most references on hydropneumatic suspension analysis regard it as harden Duffing spring and take the white noise as the system input, which is quite different from real physical model. It will introduce considerable ... Most references on hydropneumatic suspension analysis regard it as harden Duffing spring and take the white noise as the system input, which is quite different from real physical model. It will introduce considerable errors to the analytical result compared with the numerical simulation which makes it impossible to give a good depiction of the hydropneumatic suspension dynamics. In this paper, the dynamic response of the hydropneumatic suspension is worked out using statistical linearization based on 2 DOFs nonlinear suspension model. The damping of the suspension and the tire stiffness are both regarded as linear components and the real road roughness spectrum is used to work out the system input. The explicit analytical equivalent stiffness, dynamic mean value offset from statistic equilibrium position and the sprung acceleration varied with parameters of hydropneumatic spring, road roughness and vehicle velocity are worked out by substituting the nonlinear stiffness of hydropneumatic spring with its first three terms Tyler series at the static equilibrium position using James formula. The comparison of the numerical simulation and analytical result both on statistical parameters and distribution shows the validity of the analysis. The explicit form provides a concise and valid method on hydropneumatic suspension design and optimization. 展开更多
关键词 hydropneumatic suspension asymmetry stiffness nonlinear stochastic vibration statistical linearization equivalent stiffness
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Research of robust adaptive trajectory linearization control based on T-S fuzzy system 认领 引用 被引量：3
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作者 Jiang Changsheng Zhang Chunyu Zhu Liang 《Journal of Systems Engineering and Electronics》 SCIE EI 2008年第3期537-545,共9页
A robust adaptive trajectory linearization control （RATLC） algorithm for a class of nonlinear systems with uncertainty and disturbance based on the T-S fuzzy system is presented. The unknown disturbance and uncertai... A robust adaptive trajectory linearization control （RATLC） algorithm for a class of nonlinear systems with uncertainty and disturbance based on the T-S fuzzy system is presented. The unknown disturbance and uncertainty are estimated by the T-S fuzzy system, and a robust adaptive control law is designed by the Lyapunov theory. Irrespective of whether the dimensions of the system and the rules of the fuzzy system are large or small, there is only one parameter adjusting on line. Uniformly ultimately boundedness of all signals of the composite closed-loop system are proved by theory analysis. Finally, a numerical example is studied based on the proposed method. The simulation results demonstrate the effectiveness and robustness of the control scheme. 展开更多
关键词 nonlinear system trajectory linearization control robust adaptive control T-S fuzzy system.
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Equilibrium Control Theory and Direct Method of Feedback Linearization for Nonlinear Time Varying Systems  认领 引用 被引量：2
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作者 王庆林 陈悦 《Journal of Beijing Institute of Technology》 EI CAS 1999年第3期306-311,共6页
Aim To present a simple and effective method for the design of nonlinear and time varying control system. Methods A new concept of dynamic equilibrium of a system and its stability were presented first. It was pointed... Aim To present a simple and effective method for the design of nonlinear and time varying control system. Methods A new concept of dynamic equilibrium of a system and its stability were presented first. It was pointed out that what is controlled directly by the input of a control system is the system's dynamic equilibrium rather than the states. Based on it, a new feedback linearization method for nonlinear system based on the Lyapunov direct method was given. Simulation studies were also carried out. Results The example and simulation show that by use of the method, the controller design becomes very simple and the control effect is quite satisfying. Conclusion The new method unifies the stabilizing problem(regulating problem) with the tracking problem. It is a very simple and effective method for the design of nonlinear and time varying control system. 展开更多
关键词 dynamic equilibrium feedback linearization nonlinear system time varying system stability
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Sliding Mode Control Approach for Electrically Controllable Clutch of AMT Based on the Feedback Linearization 认领 引用 被引量：1
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作者 程东升 张建武 +1 位作者 叶晓峰 黄维纲 《Journal of Donghua University(English Edition)》 EI CAS 2003年第3期88-93,共6页
A sliding mode control approach based on the feedback linearization is proposed for the electrically controllable clutch of AMT vehicles. The nonlinear dynamic model for the hydraulic actuator associated with clutch i... A sliding mode control approach based on the feedback linearization is proposed for the electrically controllable clutch of AMT vehicles. The nonlinear dynamic model for the hydraulic actuator associated with clutch is established. By means of the exact feedback linearization procedure of differential geometry, an equivalent, fully controllable and linear model is derived via a homomorphic transformation for the AMT clutch system.Furthermore, a sliding mode control is introduced to improve robustness. The tracking tests are performed using the sliding mode control on a Santana LX passenger car, and the experimental results prove that this nonlinear controller is of fine robustness and high degree of tracking accuracy. 展开更多
关键词 electrically controllable clutch exact feedback linearization sliding mode control robustness
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Neural Network Based Feedback Linearization Control of an Unmanned Aerial Vehicle 认领 引用 被引量：3
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作者 Dan Necsulescu Yi-Wu Jiang Bumsoo Kim 《International Journal of Automation and computing》 2007年第1期71-79,共9页
This paper presents a flight control design for an unmanned aerial vehicle （UAV） using a nonlinear autoregressive moving average （NARMA-L2） neural network based feedback linearization and output redefinition techn... This paper presents a flight control design for an unmanned aerial vehicle （UAV） using a nonlinear autoregressive moving average （NARMA-L2） neural network based feedback linearization and output redefinition technique. The UAV investigated is non- minimum phase. The output redefinition technique is used in such a way that the resulting system to be inverted is a minimum phase system. The NARMA-L2 neural network is trained off-line for forward dynamics of the UAV model with redefined output and is then inverted to force the real output to approximately track a command input. Simulation results show that the proposed approaches have good performance. 展开更多
关键词 Nonlinear unmanned aerial vehicle （UAV） flight control non-minimum phase output redefinition neural network basedfeedback linearization.
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New trajectory linearization control for nonlinear systems undergoing harmonic disturbance 认领 引用 被引量：1
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作者 Zhu Liang Chen Li +1 位作者 Jing Zhongliang Hu Shiqiang 《Journal of Systems Engineering and Electronics》 SCIE EI 2009年第3期571-576,共6页
This paper presents a new trajectory linearization control scheme for a class of nonlinear systems subject to harmonic disturbance.It is supposed that the frequency of the disturbance is known,but the amplitude and th... This paper presents a new trajectory linearization control scheme for a class of nonlinear systems subject to harmonic disturbance.It is supposed that the frequency of the disturbance is known,but the amplitude and the phase are unknown.A disturbance observer dynamics is constructed to estimate the harmonic disturbance,and then the estimation is used to implement a compensation control law to cancel the disturbance.By Lyapunov's direct method,a rigorous poof shows that the composite error of the closed-loop system can approach zero exponentially.Finally,the proposed method is illustrated by the application to control of an inverted pendulum.Compared with two existing methods,the proposed method demonstrates better performance in tracking error and response time. 展开更多
关键词 nonlinear control system harmonic disturbance trajectory linearization control
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CONTROLLING CHAOTIC OSCILLATIONS OF VISCO-ELASTIC PLATESBY THE LINEARIZATION VIA OUTPUTFEEDBACK 认领 引用 被引量：1
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作者 陈立群 程昌钧 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1999年第12期1324-1330,共7页
Controlling chaotic oscillations of viscoelastic plates are investigated in this paper. Based on the exact linearization method in nonlinear system control theory, a nonlinear feedback control law is presented for a c... Controlling chaotic oscillations of viscoelastic plates are investigated in this paper. Based on the exact linearization method in nonlinear system control theory, a nonlinear feedback control law is presented for a class of non_affine control systems. The mathematical model describing motion of nonlinear viscoelastic plates is established, and it is simplified by the Galerkin method. The phase space portrait and the power spectrum are employed to demonstrate chaos in the system. The deflection is treated as an output, and is controlled to given periodic goals. 展开更多
关键词 controlling chaos linearization via output feedback viscoelastic plate nonlinearity
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Trajectory linearization control of an aerospace vehicle based on RBF neural network 认领 引用 被引量：6
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作者 Xue Yali Jiang Changsheng 《Journal of Systems Engineering and Electronics》 SCIE EI 2008年第4期799-805,共7页
An enhanced trajectory linearization control （TLC） structure based on radial basis function neural network （RBFNN） and its application on an aerospace vehicle （ASV） flight control system are presensted. The infl... An enhanced trajectory linearization control （TLC） structure based on radial basis function neural network （RBFNN） and its application on an aerospace vehicle （ASV） flight control system are presensted. The influence of unknown disturbances and uncertainties is reduced by RBFNN thanks to its approaching ability, and a robustifying itera is used to overcome the approximate error of RBFNN. The parameters adaptive adjusting laws are designed on the Lyapunov theory. The uniform ultimate boundedness of all signals of the composite closed-loop system is proved based on Lyapunov theory. Finally, the flight control system of an ASV is designed based on the proposed method. Simulation results demonstrate the effectiveness and robustness of the designed approach. 展开更多
关键词 adaptive control trajectory linearization control radial basis function neural network aerospace vehicle.
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Composite Control of Nonlinear Singularly Perturbed Systems via Approximate Feedback Linearization 认领 引用 被引量：1
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作者 Aleksey Kabanov Vasiliy Alchakov 《International Journal of Automation and computing》 CSCD 2020年第4期610-620,共11页
This article is devoted to the problem of composite control design for continuous nonlinear singularly perturbed(SP)system using approximate feedback linearization(AFL)method.The essence of AFL method lies in the feed... This article is devoted to the problem of composite control design for continuous nonlinear singularly perturbed(SP)system using approximate feedback linearization(AFL)method.The essence of AFL method lies in the feedback linearization only of a certain part of the original nonlinear system.According to AFL approach,we suggest to solve feedback linearization problems for continuous nonlinear SP system by reducing it to two feedback linearization problems for slow and fast subsystems separately.The resulting AFL control is constructed in the form of asymptotic composition(composite control).Standard procedure for the composite control design consists of the following steps:1)system decomposition,2)solution of control problem for fast subsystem,3)solution of control problem for slow subsystem,4)construction of the resulting control in the form of the composition of slow and fast controls.The main difficulty during system decomposition is associated with dynamics separation condition for nonlinear SP system.To overcome this,we propose to change the sequence of the design procedure:1)solving the control problem for fast state variables part,2)system decomposition,3)solving the control problem for slow state variables part,4)construction of the resulting composite control.By this way,fast feedback linearizing control is chosen so that the dynamics separation condition would be met and the fast subsystem would be stabilizable.The application of the proposed approach is illustrated through several examples. 展开更多
关键词 Approximate feedback linearization(AFL) composite control nonlinear singularly perturbed system order reduction decomposition
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Gain Scheduling Control of Nonlinear Shock Motion Based on Equilibrium Manifold Linearization Model 认领 引用 被引量：1
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作者 Cui Tao Yu Daren Bao Wen Yang Yongbin 《Chinese Journal of Aeronautics》 SCIE EI CAS 2007年第6期481-487,共7页
The equilibrium manifold linearization model of nonlinear shock motion is of higher accuracy and lower complexity over other models such as the small perturbation model and the piecewise-linear model. This paper analy... The equilibrium manifold linearization model of nonlinear shock motion is of higher accuracy and lower complexity over other models such as the small perturbation model and the piecewise-linear model. This paper analyzes the physical significance of the equilibrium manifold linearization model, and the self-feedback mechanism of shock motion is revealed. This helps to describe the stability and dynamics of shock motion. Based on the model, the paper puts forwards a gain scheduling control method for nonlinear shock motion. Simulation has shown the validity of the control scheme. 展开更多
关键词 shock motion equilibrium manifold linearization gain scheduling control
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Dual-Wavelength Linearization of Radio-over-Fiber Link for Broadband Access and Ubiquitous Sensing 认领 引用
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作者 Wu Zhongle Lv Qiang +1 位作者 Dai Yitang Lin Jintong 《China Communications》 SCIE CSCD 2012年第1期20-24,共5页
Radio-over-Fiber （RoF） technologies have been considered to be a promising solution to broadband access and ubiquitous sensing. We present a novel approach using dual-wavelength lights to suppress the nonlinear inte... Radio-over-Fiber （RoF） technologies have been considered to be a promising solution to broadband access and ubiquitous sensing. We present a novel approach using dual-wavelength lights to suppress the nonlinear intermodulation distortion in intensity-modulated RoF link both theoretically and experimentally. The system we proposed rminly consists of two Laser Diodes （LDs） at different wavelengths, a commercial available Mach-Zehnder Modulator （MZM） and a Photo Detector （PD）. More than 25 dB suppression of the Third-order Interrnodulation Distortion （IMD3） is achieved by adjusting the wavelength and opti- cal power of the laser. Besides, the output of the MZM is then sent to the photodetector via a single fiber, which simplifies the system complexity for distrbution of RF signals over long distances. 展开更多
关键词 RoF optical linearization IMD3 intensity modulator
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Investigation on full vehicle height control algorithm using feedback linearization method 认领 引用
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作者 陈思忠 刘畅 +2 位作者 吴志成 杨林 赵玉壮 《Journal of Beijing Institute of Technology》 EI CAS 2016年第2期172-180,共9页
Aiming to improve the control accuracy of the vehicle height for the air suspension system,deeply analyzing the processes of variable mass gas thermodynamics and vehicle dynamics,a nonlinear height control model of th... Aiming to improve the control accuracy of the vehicle height for the air suspension system,deeply analyzing the processes of variable mass gas thermodynamics and vehicle dynamics,a nonlinear height control model of the air suspension vehicle was built. To deal with the nonlinear characteristic existing in the lifting and lowering processes,the nonlinear model of vehicle height control was linearized by using a feedback linearization method. Then,based on the linear full vehicle model,the sliding model controller was designed to achieve the control variables. Finally,the nonlinear control algorithm in the original coordinates can be achieved by the inverse transformation of coordinates. To validate the accuracy and effectiveness of the sliding mode controller,the height control processes were simulated in Matlab,i. e.,the lifting and lowering processes of the air suspension vehicle were taken when vehicle was in stationary and driving at a constant speed. The simulation results show that,compared to other controllers,the designed sliding model controller based on the feedback linearization can effectively solve the ＂overshoot＂problem,existing in the height control process,and force the vehicle height to reach the desired value,so as to greatly improve the speed and accuracy of the height control process. Besides,the sliding mode controller can well regulate the roll and pitch motions of the vehicle body,thereby improving the vehicle＇s ride comfort. 展开更多
关键词 full vehicle height control feedback linearization sliding model control
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