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For an air-breathing hypersonic vehicle model subject to input constraints, this paper is concerned with the application of linear control theory to design its flight control system. In the framework of integral quadratic constraints (IQCs), the standard linear parameter-varying (LPV) control method is generalized to deal with the parametric, dynamic uncertainties and saturation nonlinearities associated...
The ubiquity of PID controllers in the industry has remained mysterious until now. We provide here a mathematical explanation of this strange phenomenon by comparing their sampling with the the one of “intelligent” PID controllers, which were recently introduced. Some computer simulations nevertheless confirm the superiority of the new intelligent feedback design.
This paper presents an active queue management (AQM) scheme based on sliding mode control (SMC) in order to solve the problem of congestion control in TCP communication. First, sliding mode observer is designed for input delay network system, a sufficient condition is given for the existence of such an observer in terms of linear matrix inequality (LMI). Then, based on estimated system state, a controller...
This paper presents investigations into the development of hybrid control schemes for trajectory tracking and anti-swaying control of a double-pendulum-type overhead crane (DPTOC) system. A nonlinear DPTOC system is considered and the dynamic model of the system is derived using the Euler-Lagrange formulation. To study the effectiveness of the controllers, initially nominal characteristics following...
In this paper controller synthesis based on standard and dynamic sliding modes for an uncertain nonlinear MIMO three tank System is presented. Two types of sliding mode controllers are synthesized; first controller is based on standard first order sliding modes while second controller uses dynamic sliding modes. Sliding manifolds for both controllers are designed in-order to ensure finite time convergence...
We propose an underactuated mechanical system named inverted pendulum on a cart beam system. The proposed system has three degrees-of-freedom and one control input. The mathematical model is derived using Lagrangian method and the stabilization is achieved with constraints using a linear controller designed based on linear matrix inequality approach. Simulation results are presented to validate the...
A novel control strategy based on passivity theory was proposed with special attention to trajectory tracking and robust control of rigid robot. In this paper, robot model was divided into nominal model and uncertainty part. Based on the backstepping approach, feedback passivity was used to design controller for the nominal model. A variable structure concentrated compensation controller was adopted...
Because of the strong non-linearity, uncertainty and typical underactuated properties, as well as the restraints of rudder, the design of ship tracking controller is yet a challenge work. In this paper, the problem was investigated by utilizing the active disturbance rejection control (ADRC) method. Firstly, the ADRC was introduced briefly and the characteristics of ship tracking motion were analyzed...
Aiming at time constraint and trajectory phase angle constraint of aeroassisted space rendezvous, a approach guidance method belonging to the nominal guidance was presented. Due to initial trajectory errors and external disturbances existing in atmospheric flight, linear quadratic regulator was designed and computation method of weighted coefficient matrixes was given. Mathematic simulation example...
The main contribution of this paper is a robust and precise position control method based on sliding mode for a pneumatic cylinder. The controller is implemented on a DSP system. The main challenge is the higher accuracy than 10 mum, which can be ensured with wide range of variation of the load (disturbance) and pressure in the entire operation area. The paper describes the nonlinear model of the...
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