Find Transfer Function for 2-Input System

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SUMMARY

The discussion focuses on deriving the transfer function for a two-input system, where one input is a constant reference (Vdc(ref)) and the other is a measured value (Vdc(measu)). The user employs block reduction techniques to formulate the output equation, which includes terms involving K1 and K2. The final goal is to express the relationship between V(output) and Vdc(ref) while determining the controller gains K1 and K2. The user seeks assistance in simplifying the equation to isolate Vdc(ref).

PREREQUISITES
  • Understanding of transfer functions in control systems
  • Familiarity with block reduction techniques
  • Knowledge of Laplace transforms and their application
  • Basic concepts of control system stability and gain
NEXT STEPS
  • Study the principles of block diagram reduction in control systems
  • Learn about Laplace transform applications in deriving transfer functions
  • Research methods for isolating variables in transfer function equations
  • Explore controller design techniques for determining gains K1 and K2
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Control engineers, systems analysts, and students studying control theory who are involved in designing and analyzing multi-input systems.

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I have a system with two inputs one is reference (constant and known) and another is measured its value and i need to know the transfer function for all the system.

Please anyone help me to find the transfer function because I needed it so necessary.

thanks a lot.
 

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You can use block reduction techniques to find overall transfer function of any system.
As far as given system is considered Vop is summation of two things. First one (K1 + K2/S) multiplied by (V-Vdc) and second one V*S
 
n.karthick said:
You can use block reduction techniques to find overall transfer function of any system.
As far as given system is considered Vop is summation of two things. First one (K1 + K2/S) multiplied by (V-Vdc) and second one V*S
Thank you for your reply.

I really worked like that and got the following equation:V(output) = Vdc (ref) *S + ( Vdc(ref) – Vdc(measu)(k1 + k2/S)

V(output) = Vdc(ref) *S + Vdc(ref) (k1 + k2/S) - Vdc(measu) *(k1 + k2/S) but I could not get the final equation between V(output) and Vdc(ref), Because the last term of the equation does not contain Vdc(ref).

Can you help me to get the final transfer function, where I want to find the gain of the controller (K1, K2 ).

Thank you very much.
 

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