The main objective of this paper is to perform a robust controller design using discrete-time sliding mode control (DSMC). In the control scheme, two-degree-of-freedom (2-DOF) control strategy turns the DSMC, which ge...
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ISBN:
(纸本)9781479978632
The main objective of this paper is to perform a robust controller design using discrete-time sliding mode control (DSMC). In the control scheme, two-degree-of-freedom (2-DOF) control strategy turns the DSMC, which generally utilized state feedback into output feedback controller. The designed control scheme is considered with feedback and feedforward combination by implementing the zero phase error tracking control (ZPETC), which particularly intended for the nonminimum phase electro-hydraulic actuator (EHA) system application. In the experimental works, a sinusoidal trajectory with different frequencies is employed to assess the DSMC performance under nonlinear and uncertain condition. Experimental results show the DMSC with perfect tracking control approach is capable to reduce the phase lag occurred due to nonlinear phenomenon. The proposed controller also is highly robust under various points of trajectories and significantly shows enhancement in tracking control performance as compared to the conventional controllers.
An increasing number of applications require the integration of data from various disciplines, which leads to problems with the fusion of multi-source information. In this paper, a special information structure formal...
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Recently due to the increase in electric power generated by wind and its feeding into the power network, even 1000MW ultra-supercritical units are required to operate in variable load conditions. This puts forward hig...
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Using translated X-factorable phase space transformations and nonlinear variable transformations a dynamically similar linear ODE model is associated to the Lotka-Volterra system models with a positive equilibrium poi...
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The conventional variable-pressure hydraulic pump can only work at two or three pressure levels. The outlet pressure is conducted to a piston changing the angle of the wash plate inside the pump by a control valve. A ...
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The conventional variable-pressure hydraulic pump can only work at two or three pressure levels. The outlet pressure is conducted to a piston changing the angle of the wash plate inside the pump by a control valve. A novel design proposed here makes the pump be capable of changing the pressure level continuously. The basic idea is adding a proportional solenoid into the control valve, and the stable pressure level can be determined by the input current rate. Some novel structures are designed to reduce the driving force upon the valve spool. The detailed mathematical model is established, and the dynamics of the system is carefully studied. Using the multi-disciplinary modeling and simulation, the effectiveness of the proposed design is validated and a good performance of changing pressure level is obtained.
This paper considers the consensus problem of linear multi-agent systems with actuator *** communication topology is undirected ***,an observer is designed to estimate each agent's states and *** on the general fa...
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ISBN:
(纸本)9781479970186
This paper considers the consensus problem of linear multi-agent systems with actuator *** communication topology is undirected ***,an observer is designed to estimate each agent's states and *** on the general faulty agent model and the observer's states,we then propose fault tolerant control protocol and the corresponding conditions to achieve ***,numerical examples are given to illustrate the theoretical results.
We present an adaptive control scheme of accumulative error to stabilize the unstable fixed point for chaotic systems which only satisfies local Lipschitz condition, and discuss how the convergence factor affects the ...
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We present an adaptive control scheme of accumulative error to stabilize the unstable fixed point for chaotic systems which only satisfies local Lipschitz condition, and discuss how the convergence factor affects the convergence and the characteristics of the final control strength. We define a minimal local Lipschitz coefficient, which can enlarge the condition of chaos control. Compared with other adaptive methods, this control scheme is simple and easy to implement by integral circuits in practice. It is also robust against the effect of noise. These are illustrated with numerical examples.
Hydraulic actuation control system demonstrates instability in several parameter regions. A nonlinear mathematical model of hydraulic rudder control system in airplane is established. Non-dimensional analysis is emplo...
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Hydraulic actuation control system demonstrates instability in several parameter regions. A nonlinear mathematical model of hydraulic rudder control system in airplane is established. Non-dimensional analysis is employed to analyze the regions of initial Hopf bifurcation which may lead to oscillations of hydraulic actuation system under the effect of load. Taking the system damping coefficient parameter as a reference, the load force of hydraulic actuators has great implications on the system stability. Numerical simulation using ODE solver indicates that stable impacting limit cycle exists at several particular parameters. The analysis in this paper can support the design and vibration control of the hydraulic rudder control system.
In this paper, the finite-time stabilization problem for second-order systems subject to mismatched disturbances is studied. By integrating the homogeneous control technique and the finite-time disturbance observer to...
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ISBN:
(纸本)9781467374439
In this paper, the finite-time stabilization problem for second-order systems subject to mismatched disturbances is studied. By integrating the homogeneous control technique and the finite-time disturbance observer together, a kind of feedforwardfeedback composite controllers are proposed. These controllers globally finite-time stabilize the disturbed systems. Moveover,the composite control method is also used to solve the finite-time consensus problem of leaderless second-order systems with mismatched disturbances. Simulations demonstrate the effectiveness of the proposed control algorithms.
In the contribution new results in a control design of a general three-dimensional non-holonomic integrator(NHI) including drift terms is *** global asymptotic stability(GAS) proposed non-linear controller assure also...
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ISBN:
(纸本)9781479970186
In the contribution new results in a control design of a general three-dimensional non-holonomic integrator(NHI) including drift terms is *** global asymptotic stability(GAS) proposed non-linear controller assure also minimal input norm during transients and in steady states and high dynamic in output response for a piecewise constant reference *** to appropriate input modulation internal states follow natural periodic orbits necessary to fulfill non-holonomic *** a non-linear transformation that describe error dynamics feedback stability is proven by using Lyapunov *** value of the proposed design is illustrated on the example of induction machine torque control along with a simulation and experimental results.
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