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How to understand the concept of DOF in control system?

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Hello experts,
Here DOF stands for Degree Of Freedom which often appears in control system design related document. I am confused about its definition. Anyone could explain it in a simple way?
Thanks in advance.
 

Some definitions found in the internet:

[a]
Any of the minimum number of coordinates required to specify completely the motion of a mechanical system.


Any of independent thermodynamic variables, such as pressure, temperature, or composition, required to specify a system with a given number of phases and components.

[c]
The number of degrees of freedom in a problem, distribution, etc., is the number of parameters which may be independently varied.
 

Within the viewpoint of contorl systems theory a degrre of freedom og a controller specifies that a controller can be divided in subcontrollers (each one of the is a degree of freedom) this subcontroller process especifical inputs of a controlled system.
 

read Control systems by nagrath /gopal,
whole theory is explained there
 

control systems by---Norman S. Nise

This book is excellent!!. It is well presented and easy to understand. It did not assume that the reader knows the basic and explains the essence that is needed to follow through the subject
 

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