basics of measurement and control notes

BMC

The systems need to be controled because there are disturbances that are created which deviate the system from its set point or say set parameters.

Kind of disturbances:-

1) stoichistic

2) deterministic

Control systems:- The system consisting of various componenets that are connected logically is a control system.

optimality:- Minimum input + [error--->0] = optimality (optimal control)

Transfer function:- relation between input and output.

TF :- laplace(output)/laplace(input) |initial condition zero

Superposition:-

U1 + U2 —-> control system —-> Y

for U1=0 –> Y=Y1

for U2=0 –> Y=Y2

then for a linear system Y=Y1+Y2, this is superposition theorem.

Homogenity:- if input is 0 then output is zero is the priciple of homogenity.

then a simple example based on laplace transformation was solved in the class, to find the TF(transfer function)