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Lecture_1 - ME 451: Linear Control Systems Lecture 1:...

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ME 451: Linear Control Systems Lecture 1: Preliminaries
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Definitions and Concepts t l t d i h bj ti f t ti t l d i i t Control system design: The objective of an automatic control design is to influence a system in such a way that it performs satisfactorily the tasks presented by the designer. Definition: A system is an arrangement of components connected together acting as a unit Definition: A control system is an arrangement of components connected in such a way as to command itself or another system Examples: Temperature control in a room, an autopilot of an airplane, control of a distillation column, population of a species (fish, mosquitoes), price control A control system is defined by the relation between its input and output signals. In control system terminology these signals are referred to as manipulated and controlled variables
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Representation of Control Systems A control system system is schematically defined by a functional diagram that denotes the relationship between input and output signals. Note: Functional diagram represents a flow of information and not operation on any physical quantity Flow of information System Input Output m c (manipulated variable) (controlled variable) Functional Diagram
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Example: Control of Room Temperature q t f l e heat flow steam flow rate v steam temperature T s T- r room temperature Environmental temperature T e Room heat balance (manipulated variable) (controlled variable) flow rate v Room temperature T 0 Steam temperature T s Note: Variables T s and T e are not input or output signals but influence system’s behavior
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This note was uploaded on 07/20/2009 for the course AME 451 taught by Professor Flashner during the Fall '07 term at USC.

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Lecture_1 - ME 451: Linear Control Systems Lecture 1:...

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