Stability of Control System
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Stability of Control System (1)
- Bu sahifa navigatsiya:
- Stability of Control System
- Introduction
- Now, what are unbounded signals
- Types of Stable System
- The figure shown below represents the step response of an absolutely stable system
- The figure below represents an unstable system
Stability of Control System FERPI STUDENT OF GROUP 69-20 USMONALIYEV OTABEK OF TECHNOLOGICAL PROCESSES AND DEVICES INDEPENDENT WORK Stability of Control System The stability of a control system is defined as the ability of any system to provide a bounded output when a bounded input is applied to it. More specifically, we can say, that stability allows the system to reach the steady- state and remain in that state for that particular input even after variation in the parameters of the system. Introduction In order to get the specified output, the various parameters of the system must be controlled. Along with this, the system must be stable enough so that the output must not get affected by the undesirable variations in the parameter of the system or disturbances. Thus we can say that a stable system is designed so as to get the desired response of the system without any intolerable variation with the changes in the system parameters. It is to be noted here that stability or instability is the characteristic property of the control system and thus depends on the closed-loop poles of the system. 01 02 03 Stability of Control System We have already discussed that a stable system generates bounded output for bounded input (BIBO). Now, what are unbounded signals? So, generally, the signals whose graph shows continuous rise thereby showing infinite value such as ramp signal are known as unbounded signals. The figure shown below represents the unbounded signal: 01 02 03 04 When the poles of the transfer function of the system are located on the left side of the s-plane then it is said to be a stable system. However, as the poles progress towards 0 or origin, then, in this case, the stability of the system decreases. If for a system, the poles are present in the imaginary axis and are non-repetitive in nature, then it is said to be a marginally stable system. Types of Stable System Absolutely stable system: An absolutely stable system is the one that provides bounded output even for the variation in the parameters of the system. This means it is such a system whose output after reaching a steady-state does not show changes irrespective of the disturbances or variation in the system parameter values. The figure shown below represents the step response of an absolutely stable system: The nature of poles for the absolutely stable condition must be real and negative. The figure below represents an unstable system: Conditionally stable system: A conditionally stable system gives bounded output for the only specific conditions of the system that is defined by the parameter of the system. REFERENCE Google.com Download 0.81 Mb. Do'stlaringiz bilan baham: |
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