Design and robust tuning of control scheme based on the PD controller plus Disturbance Observer and low-order integrating first-order plus dead-time model

2009 ◽  
Vol 48 (4) ◽  
pp. 410-416 ◽  
Author(s):  
M.R. Mataušek ◽  
A.I. Ribić
Keyword(s):  
Disturbance Observer ◽  
Dead Time ◽  
Pd Controller ◽  
Time Model ◽  
First Order ◽  
Control Scheme ◽  
Low Order

scholarly journals Discrete-Time First-Order Plus Dead-Time Model-Reference Trade-off PID Control Design

2019 ◽  
Vol 9 (16) ◽  
pp. 3220 ◽  
Author(s):  
Ryo Kurokawa ◽  
Takao Sato ◽  
Ramon Vilanova ◽  
Yasuo Konishi
Keyword(s):  
Discrete Time ◽  
Pid Control ◽  
Continuous Time ◽  
Dead Time ◽  
Design Method ◽  
Control Design ◽  
The Other ◽  
Time Model ◽  
Trade Off ◽  
First Order

The present study proposes a novel proportional-integral-derivative (PID) control design method in discrete time. In the proposed method, a PID controller is designed for first-order plus dead-time (FOPDT) systems so that the prescribed robust stability is accomplished. Furthermore, based on the control performance, the relationship between the servo performance and the regulator performance is a trade-off relationship, and hence, these items are not simultaneously optimized. Therefore, the proposed method provides an optimal design method of the PID parameters for optimizing the reference tracking and disturbance rejection performances, respectively. Even though such a trade-off design method is being actively researched for continuous time, few studies have examined such a method for discrete time. In conventional discrete time methods, the robust stability is not directly prescribed or available systems are restricted to systems for which the dead-time in the continuous time model is an integer multiple of the sampling interval. On the other hand, in the proposed method, even when a discrete time zero is included in the controlled plant, the optimal PID parameters are obtained. In the present study, as well as the other plant parameters, a zero in the FOPDT system is newly normalized, and then, a universal design method is obtained for the FOPDT system with the zero. Finally, the effectiveness of the proposed method is demonstrated through numerical examples.

Two composite guidance laws based on the backstepping control and disturbance observers with autopilot lag

2019 ◽  
Vol 41 (10) ◽  
pp. 2957-2969 ◽  
Author(s):  
Chaoyuan Man ◽  
Zhenxing Zhang ◽  
Shihua Li
Keyword(s):  
Disturbance Observer ◽  
Three Dimensional ◽  
Simulation Studies ◽  
Missile Guidance ◽  
Nonlinear Disturbance Observer ◽  
First Order ◽  
Guidance Law ◽  
Control Scheme ◽  
Backstepping Controller ◽  
Guidance Laws

A composite three-dimensional (3D) missile guidance law is proposed for manoeuvering targets with the consideration of the first-order autopilot dynamics without any linearization. This guidance law consists of a backstepping controller and a feedforward compensation based on disturbance observers. In this control scheme, the unknown target acceleration is regarded as part of the lumped disturbance, estimated by a disturbance observer, and then feedforward compensated. The backstepping controller is introduced to deal with unmatched disturbances. Moreover, both the nonlinear disturbance observer (NDOB) and the generalized proportional integral observer (GPIO) are employed in the derivation. Simulation studies demonstrate the effectiveness of the proposed guidance law, and compare the guidance performance of the two composite guidance laws with different disturbance observers.

Robust Predictive PI Controller Based on First-Order Dead Time Model

2008 ◽  
Vol 41 (2) ◽  
pp. 5808-5813 ◽  
Author(s):  
F. Arousi ◽  
U. Schmitz ◽  
R. Bars ◽  
R. Haber
Keyword(s):  
Dead Time ◽  
Pi Controller ◽  
Time Model ◽  
First Order

A composite anti-disturbance control scheme for attitude stabilization and vibration suppression of flexible spacecrafts

2015 ◽  
Vol 23 (15) ◽  
pp. 2470-2477 ◽  
Author(s):  
Zhen Wang ◽  
Zhong Wu ◽  
Lijun Li ◽  
Jun Yuan
Keyword(s):  
Attitude Control ◽  
Disturbance Observer ◽  
Vibration Suppression ◽  
Disturbance Attenuation ◽  
Pd Controller ◽  
Parameter Uncertainties ◽  
Performance Simulation ◽  
Attitude Stabilization ◽  
Multiple Disturbances ◽  
Control Scheme

Abstract: There exist multiple disturbances resulting from the structural vibrations of flexible appendages, unknown external and internal disturbances, and parameter uncertainties, which affect the attitude control performance seriously. To enhance the disturbance attenuation performance and vibration suppression ability, a composite anti-disturbance control scheme (CADCS) based on disturbance observer is proposed for attitude stabilization and vibration reduction of flexible spacecraft. The CADCS combines a composite disturbance observer (CDO) and a PD controller with feedforward. The multiple disturbances are equivalent to slowly varying disturbance and harmonic disturbance. The CDO can estimate two types of disturbance and compensate for them through feedforward. The PD controller realizes the asymptotic convergence by compensating the disturbance from CDO. The CADCS based on CDO and PD controller is not only simple and easy to realize, but also yields better vibration suppression and anti-disturbance performance. Simulation results of a certain spacecraft demonstrate the effectiveness of the proposed CADCS.

scholarly journals Performance evaluation of two degree of freedom conventional controller adopting the smith principle for first order process with dead time

2019 ◽  
Vol 9 (4) ◽  
pp. 3002 ◽  
Author(s):  
Belinda Sharon Bright ◽  
R. Swarnalatha
Keyword(s):  
Degrees Of Freedom ◽  
Dead Time ◽  
Smith Predictor ◽  
System Structure ◽  
Order Process ◽  
First Order ◽  
Time Uncertainty ◽  
Control Scheme ◽  
Control Schemes ◽  
Two Degree Of Freedom

The Proportional Integral Derivative Controller is a typical controller implemented frequently in many services and integrating the Smith predictor is an extremely useful control system structure for processes with dead time. This paper has evaluated two control schemes with the modified structures of the Smith predictor incorporating dead time compensators and conventional controllers for first order process with dead time. The disturbance response and the set point response for both the control schemes were decoupled from each other. Therefore two degrees of freedom control design was formulated, and hence the responses could be designed separately. The two control schemes have mainly two variables to be adjusted that decide the robustness and closed-loop behaviour. This paper also contains the calculation of various parameters that were used in each scheme. A comparison of the two control schemes along with the general Smith predictor control scheme was made using Simulink/Matlab. The conclusion is the second control scheme gave better response overall for the processes with dead time having dead time uncertainty and for the processes with dead time without dead time uncertainty.

scholarly journals Anti-Windup Starting-Time Control Strategy for a First-Order-Plus-Dead-Time Model

2003 ◽  
Vol 123 (6) ◽  
pp. 696-702
Author(s):  
Hitoshi Onogaki ◽  
Syuichi Yokoyama ◽  
Hiroto Hamane
Keyword(s):  
Control Strategy ◽  
Dead Time ◽  
Time Model ◽  
First Order ◽  
Starting Time ◽  
Time Control
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