Order & Poles: Basics of Control Engineering

AI Thread Summary
In control engineering, the order of a system is defined by the number of poles, both at the origin and elsewhere. This classification is significant because the arrangement of poles affects system response and design considerations. The transfer function format, particularly the s^m term in the denominator, serves to highlight the poles' impact on system behavior. Understanding the distinction between order and type is crucial for interpreting control systems effectively. Clarifying these concepts can enhance the design and analysis of control systems.
dhruv.tara
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Homework Statement


In control engg. we define the order of the system as (or atleast as far as I have understood as) Nu/s^m*(s+a)(s+b)...

I cannot understand the base for such classification? Why are we classifying systems based on the number of poles they have on origin?


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No, the order of the system is the number of poles (at the origin and elsewhere).
 
CEL is correct.

Something to add however is the way you have written the transfer function - it's done for a purpose. In controls seeing how many poles are at the origin, you're s^m part of the denomenator, has many ramifications that can be crucial when interpreting a system response or designing for one. So in seeing, and perhaps formatting a transfer function in this fashion, it is an aesthetic move but can make things easier.
 
thanks guys I was confusing myself with the order and type of the system... good I could get that clear just in time :)
 

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