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In this paper, Fuzzy PID and Fuzzy PD+I controller are designed for a nonlinear quarter car suspension system. The main aim of these controllers is to decrease vertical car body displacement and control signal, therefore provides more comfortable conditions for passengers. Simulation results show excellent efficiency of the proposed controller.
A design method of seam tracking system according to planned welding track in advance was proposed based on teaching and playback and real-time control, and a variable parameter PID controller which adapt to the changing welding line form and the working condition was designed for the system, and the control model was established too. The control strategy was simulated in MATLAB environment, and the...
Generally,in order to improve dynamic performance,second-order systems generally decrease oscillation and overshoot of output response by increasing equivalent damping ratio with velocity feedback.But output response will be dull and system's speediness property will be worse because of damping ratio's increment. Variable damping ratio control by fuzzy adaptive PID may adjust system's damping ratio...
Moving from antagonistic pneumatic Air Muscle actuation to motor-based actuation requires a distinctly different design of motor component. This design is presented in the context of recent developments on the Shadow Dextrous Hand. Antagonistic systems provide certain advantages, but the constant load on the system produces wear and as it is well known, pneumatics offers its own control and mobility...
Many model-based tuning methods for PI(D) controllers, especially - but not exclusively - in the process control domain, employ models with delay. Doing so has advantages, basically in terms of tuning rules' simplicity, but also potential drawbacks, especially from the standpoint of performance (and sometimes robustness). This manuscript aims at initiating and fostering a critical discussion on the...
A two-degree-of-freedom control scheme is proposed for enhanced control performance of integrating and unstable processes with time delay. The two controllers in the scheme are well placed to tune from the setpoint and disturbance. The design steps of these two controllers are independent. The H2 optimal control method is used to design the set-point tracking controller and an optimal internal model...
Proportional Integral Derivative (PID) controller is the most preferable controller in industries that does not require precise analytical model of the system to be controlled. This paper presents a design and implementation of PID (Proportional-Integral-Derivative) controller based on FPGA (Field-Programmable Gate Arrays) for low voltage synchronous buck Converter. Matlab/Simulink environment is...
This paper presents design, modeling and simulation of a low-power digitally controlled synchronous rectifier (SR) buck converter. Due importance is given in the model to the effect of non-linear parameters in low voltage converters, such as equivalent series resistance ESL of the inductor, ESR of capacitor and RDS(on) of MOSFET switches. A digital PID controller is design adopting direct digital...
The aim of this paper is to present a method for on-line tuning of PID controller for stable processes. Without breaking closed-loop control, an explicit process model is developed from a single relay test and then controller gains are re-tuned non-iteratively to improve the performance. An explicit tuning rules are derived with special emphasis on minimizing the control efforts. Examples are given...
Electro-hydraulic system (EHS) consists of several dynamic parts which are widely used in motion control application. These dynamic parts need to be controlled to determine direction of the motion. Mathematical model of EHS is required in order to design a controller for the system. In this paper, system identification technique is used for system modeling. Model of the system is estimated by using...
In this thesis, based on the analysis on the transform processes of wind energy and electric energy, considering the characteristics as the complexity of the mathematical model for the wind power generating system, strong time-varying volatility, the existence of coupling between parameters, the severity of disturbance from the environment and the difficulty of realizing the controllers etc, by Inner...
PID controller has been widely applied in engineering area. In this paper, multi-objective differential evolution (MODE) is used to design a multi-objective robust PID controller for two MIMO systems known as distillation column plant and longitudinal control system of the super maneuverable F18/HARV fighter aircraft. Multi-objective robust PID controller problem is formulated by minimizing integral...
In the process industry the loop problem is how to choose a suitable set of PID parameters because of their influence on the asymptotic stability of the system. This paper develops a PID control algorithm based on Internal Model Control (IMC) design for linear and nonlinear control systems in the discrete-time domain under satisfactory performance. Compared with traditional feedback controllers, IMC...
This paper deals with architecture and algorithm design of networked control systems (NCSs) to cope with network outages. A Networked PID controller and an internal model control based tuning scheme is proposed, using the jitter margin to ensure stability despite dropped packets. For longer periods of disconnection, an outage heuristic is proposed. The control design and outage heuristic need only...
In this paper several optimal control strategies are proposed for the power management subsystem of a hybrid fuel cell/supercapacitor power generation system. The control strategies are based on different control configurations involving the power converters associated to the hybrid source. Given certain desired performances, Linear Matrix Inequalities methods are used to solve the controller design...
Aiming at the problem that it is difficult to confirm the parameters of the PID controller and the parameters can not be changed once identified, an intelligent PID control method is proposed. According to the size of the system error, this algorithm controls the system with different subsections of different parameters, by using the particle swarm optimization (PSO) to optimize the parameters of...
This paper presents the design, development and implementation of an automation system of batch process suitable for vulcanization accelerator production applications. The unique feature of the accelerator production process is that it has complex nonlinear, time-varying and large time-delay characteristics. Based on its kinetics characteristics and technical analysis of the batch process, adaptive...
This work describes a novel modeling and simulation approach of brushless DC motor control system depended on analysis of it's mathematical model. The brushless DC motor ontology model, the voltage type inverter circuit model, the hysteresis current tracking comparative model and the PID speed controller model were constructed in the Simulink environment of Matlab. S-function was used in modeling...
In this paper, a program-controlled current source system which is based on direct digital frequency synthesis technology has been proposed. The system adopts PIC16F877 microcontroller as the control center, chooses the AD9850 chip to achieve the program. Through closed-loop design, software use discrete incremental digital PID algorithm to realize precise control of output current system of small...
This paper presents design of a robust hovering controller for a quad tilt-wing UAV to hover at a desired position under external wind and aerodynamic disturbances. Wind and the aerodynamic disturbances are modeled using the Dryden model. In order to increase the robustness of the system, a disturbance observer is utilized to estimate the unknown disturbances acting on the system. Nonlinear terms...
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