Order of system

dhruv.tara

1. The problem statement, all variables and given/known data
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?


2. Relevant equations



3. The attempt at a solution

CEL

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

Ecthelion

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.

dhruv.tara

thanks guys I was confusing myself with the order and type of the system... good I could get that clear just in time :)