Characterization of Fixed Modes in a Structurally Constrained Control System with Input and Output Delays

2011 ◽  
Vol 44 (1) ◽  
pp. 2552-2557 ◽  
Author(s):  
Ahmadreza Momeni ◽  
Amir G. Aghdam
Keyword(s):  
Control System ◽  
Constrained Control ◽  
Input And Output

The Power Plant Boiler Automatic Control Based on PLC

2012 ◽  
Vol 235 ◽  
pp. 176-180 ◽  
Author(s):  
Yao Yuan Zhang ◽  
Zi Sheng Zhang ◽  
Jie Yu ◽  
Wei Guo ◽  
Zhi Qing Liu
Keyword(s):  
Control System ◽  
Power Plant ◽  
Automatic Control ◽  
Heat Energy ◽  
Total Power ◽  
Time Data ◽  
Input And Output ◽  
Communication Program ◽  
Power Plant Boiler ◽  
Plant Boiler

The power plant boiler automatic control system is designed on the basis of Siemens S7-200 in this paper. Based on the introduction of the Siemens S7-200 and the works of the boiler, the total power plant boiler control system is designed in details. Besides the initialized program is designed based on the input and output address of all the switches. The communication program is achieved, including the initialization of the program running parameters, the call of the system subroutine, the calculation of the checksum, the real-time data receiving process, etc. Finally, the heat energy is successfully and automaticly converted to the electricity in the boiler based on the PLC.

Operator-Based Control System Analysis and Design for Nonlinear System with Input and Output Constraints

2018 ◽  
Vol 30 (6) ◽  
pp. 950-957
Author(s):  
Shuhui Bi ◽  
Lei Wang ◽  
Shengjun Wen ◽  
Liyao Ma ◽  
◽  
...  
Keyword(s):  
Control System ◽  
Nonlinear System ◽  
System Analysis ◽  
Sufficient Conditions ◽  
Input Constraint ◽  
Analysis And Design ◽  
Input And Output ◽  
Output Constraints ◽  
The Stability ◽  
Output Constraint

Smart material-based actuators and sensors have been widely used in practice owing to their various advantages. However, in the working process of these actuators and sensors, their output responses always deduce non-smooth nonlinear constraints. The constraint resulting from the actuator is called the input constraint and the constraint caused by the sensor is called the output constraint. These input and output constraints may induce inaccuracies and oscillations, severely degrading system performance. Therefore, the input and output constraints brought about by actuators and sensors should be considered in control system design. In this paper, system analysis for a nonlinear system with input and output constraints will be considered. The effect from the input constraint to the internal signal in the control system will be discussed. Moreover, the influence of the output constraint on the whole system will be studied. Further, the sufficient conditions for maintaining the stability of the system are obtained. Then, by using the robust right coprime factorization approach, an operator-based internal model like control structure is proposed for mitigating the input and output constraints. Finally, the effectiveness of the proposed design scheme will be confirmed through numerical simulation.

Robustness of adaptive discrete-time LQG control for first-order systems

2010 ◽  
Vol 58 (1) ◽  
pp. 89-97
Author(s):  
A. Królikowski ◽  
D. Horla
Keyword(s):  
Control System ◽  
Discrete Time ◽  
Point Of View ◽  
Constrained Control ◽  
Certainty Equivalence ◽  
First Order ◽  
Lqg Control ◽  
Self Tuning ◽  
And Performance ◽  
Performance Robustness

Robustness of adaptive discrete-time LQG control for first-order systemsThe discrete-time adaptive LQG control of first-order systems is considered from robustness point of view. Both stability and performance robustness are analyzed for different control system structures. A case of amplitude-constrained control is presented, and application of certainty equivalence for self-tuning implementation is also discussed.

Energy Based Characterization of Fatigue Behaviour of Cyclically Unstable Materials

2009 ◽  
Vol 147-149 ◽  
pp. 512-517 ◽  
Author(s):  
Ewald Macha ◽  
Jacek Slowik ◽  
Roland Pawliczek
Keyword(s):  
Control System ◽  
Laboratory Tests ◽  
Fatigue Behaviour ◽  
Loop Control ◽  
New Energy ◽  
Loop Control System ◽  
Definition Of ◽  
Close Loop Control ◽  
Close Loop Control System

The paper presents a definition of a new energy based parameter which allows to better describe fatigue proprieties of materials, especially cyclically unstable materials in comparison with the Lagoda-Macha parameter. The proposed parameter distinguishes positive and negative work of external force and depends on the sign of the stresses in paths of strain in materials. It is used in laboratory tests for control of a fatigue process on hydraulic stand. A close-loop control system has been equipped with computer program based on MATLAB/Simulink module.

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