Assuming that there are presently no disturbances in our system, and the measured variable is at...
Assuming that there are presently no disturbances in our system, and the measured variable is at the set point value, what should the controller output signal look like (should it be at a steady value, increasing, decreasing or oscillating)?
With a particular set of (PB) and (I) values, you observe that the response is underdamped, should you increase the value of (PB) or decrease the (PB) to increase the level of damping?
With a particular set of (PB) and (I) values, you observe that the response is underdamped, should you increase the value of (I) or decrease the value of (I) to increase the level of damping?
With a particular set of (PB) and (I) values you observe that the response is underdamped, should you increase (PB) or decrease (PB), while keeping (I) constant?
With a particular set of (PB) and (I) values you observe that the response is underdamped, should you increase (I) or decrease (I), while keeping (PB) constant?
While keeping the values of (PB) and (I) constant, what would be the effect of a high or low value of the derivative term (D) on a system that is currently underdamped or overdamped?
Homework Answers
Answer a - If no disturbance in the system and measured variable is at set point value then controller output will be at steady state because when there is no disturbance means till that system is at steady state and controller has nothing to do in this situation so controller output signal is steady state.
Answer b- You have some value of PB and I and your system is underdamped and you need to increase the level of damping means you need to increase the damping factor. To achieve this you should decrease the value of Kc means increase the value of PB to achieve the increased damping, PB is inversely proportional to Kc.
Answer c- To increase the damping you should increase the value of I because as I increases damping factor increases so damping increases.
Answer d- While keeping I constant you should increase the value of PB to increase the damping of the system.
Answer e- While keeping PB constant you should increase the value of I to increase the damping of the system.
Answer f- If you have fixed value of PB and I and your system is underdamped then increasing the value of D increases the value of damping factor and system can be overdamped and decreasing the value of D reduces damping factor and your system will be more underdamped system. if your system is overdamped then increasing value of D increases the damping factor and system will become more damped and if you decrease the value of D damping factor decreases so system will be less damped as compared to the previous.
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