Workshop 4: Feedback control

WORKSHOP 4 FEEDBACK CONTROL Table W4.3 PID controller optimization... 

We have seen in Workshop 3 that the process itself is able to attenuate with no control, i.e. open loop. We have just tuned our feedback controller for various levels of capacitance and can now determine what the process plus control (closed loop) is able to attenuate. By subtracting the open loop attenuation from the total attenuation we can determine what the controller itself contributes to the overall process attenuation. 

This workshop will show how the response of feedback control loops can be improved through the use of other control methods. These other methods include measuring common disturbances and taking action before they affect the controlled variable (feedforward control) and using a faster responding loop to decrease the response time of a system with a large time constant (cascade control). You will determine what conditions are necessary for feedforward or cascade control to be useful and identify which parameters reduce the effectiveness of these control methods. 

Meggers, J., Schuba, M. Analysis of feedback error control schemes for block based video communication. In Proceedings of the International Packet Video Workshop (PV 99), New York, USA, IEEE Computer Society Press, Los Alamitos (1999)... 

If a su estion program is used, the leadership team should ensure that collection points, both hardcopy and digital resources are checked frequently. All su estions and/or comments should be reviewed and feedback provided to employees in a timely manner. Su estion pregrams can be just dust collectors or a waste of time without a positive emphasis and routine foUow-up (Oregon OSHA Workshop Materials, Hazard Identification and Control, n.d.). 

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