Intro Flashcards
An industrial process that deals with the monitor and adjustment of input parameters to attain the desired output
Process control
Value of the desired output
Set point
Parameter being manipulated to achieve the desired output
Controlled variable
A variable that causes the control variable to maintain the desired output
Manipulated variable
Any system input that will cause changes in the controlled variable
Disturbance
Ability to maintain the process variable at its desired value in spite of disturbances that might be experience.
Disturbance rejection
Ability to move the process variable from one setting to a new desired setting
Set point tracking
Checks if there is a need to manipulate the variables.
Error
The controller automatically acts to restore the control variable back to the desired value
Closed-loop feedback control system
Measurement signal disconnected first from the controller, then the controller output manually adjusted to attain the desired variable
Open-loop feedback control system
Type of controller that automatically turns on or off depending on the error values.
“On/Off” control
Controller that changes the input value in proportion to the error value. The input maintains its value when error is zero.
Proportional control
type of control system wherein the information about the state of the system were “fed back” to a controller, prompting changes if certain error value is achieved.
Feedback control
How do control system check if there is a need to manipulate the variables?
By measuring error
What is the value of error?
𝐸𝑟𝑟𝑜𝑟 = (𝑆𝑒𝑡 𝑝𝑜𝑖𝑛𝑡 𝑣𝑎𝑙𝑢𝑒) − (𝑀𝑒𝑎𝑠𝑢𝑟𝑒𝑚𝑒𝑛𝑡 𝑠𝑖𝑔𝑛𝑎𝑙 𝑜𝑓 𝑡h𝑒 𝑐𝑜𝑛𝑡𝑟𝑜𝑙𝑙𝑒𝑑 𝑣𝑎𝑟𝑖𝑎𝑏𝑙𝑒)
Numerical method for solving the system of differential equations (data points were presented instead of particular solution)
Runge-Kutta
Derived from Euler method at 4th order (increasing the order will make the data points more accurate, as long as the h value is very small).
Runge-Kutta
a mathematic equation that can predict the dependent variable at any values of the independent variable.
function
If a function has two possible outcomes, with each outcomes has different set of conditions, the function is said to be
piecewise function
states that if 𝐹(𝑠) is the Laplace transform of 𝑓(𝑡) ,then
lim [𝑓𝑡] t→ infinity =lim [𝑠𝐹𝑠] s→0
provided that 𝑠𝐹 𝑠 does not become infinite for any value of s.
Final Value Theorem
states that if 𝐹 𝑠 is the Laplace transform of 𝑓 𝑡 , then
lim𝑓𝑡 =lim𝑠𝐹𝑠 !→% $→#
Initial Value Theorem
