Tuning Exam Flashcards
When to carry out test on system?
- System performance is suspect
- Any major component is changed
- IAW planned maintenance schedules
What does a test need for it to be a valid test?
- Test should mirror the actual system performance
- there should be a ‘perfect’ set of results available under same test conditions
When would you tune a system?
only when out of tolerance
‘carried out when ‘testing results’ are known to be incorrect and overall system performance is outside tolerances.
what is tuning the system?
process of obtaining the designed optimum overall performance of a servo or system by suitable adjustments of control variables
What are the testing/tuning parameters?
Accuracy (what is the tolerance of Theta E)
Oscillating (how big is Theta E)
What are the two tuning methods?
Analytical
Comparative
Define Comparative tuning.
Particular critical aspects of a system performance are examined, then compared with a profile found with practice to correspond with the acceptable margin of stability and accuracy
Define Analytical tuning.
Analytical tuning is a way to set up control systems using math formulas to get the best performance without guessing.
Define ‘Step’ input
Demands that a load changes its position from one angle to another at an instant in time
Define ‘Ramp’ (constant speed) Input.
Input demands that a load changes its position at a constant rate
Define ‘Constant Acceleration’
Input demand that the load changes its position at a constant acceleration
Define simple harmonic motion.
Inputs demand that the load changes its position sinusoidally
Can you tune out backlash in a SHM?
No
Define undamped.
When, in response to a step input, the output oscillates about the input with no reduction in the magnitude of successive overshoots
Define underdamped
A system is said to be underdamped when, in response to a step input, the output overshoots alignment at least once
