Thought Questions

Open Ended Problems

The Federal government in a country wants to establish timely compensation for each of the following changes.  Describe some likely disturbances and appropriate feedforward controllers for each.


  • Health care for retired citizens

  • Maintenance of a viable population of wildlife (e.g., fish) that are harvested for human consumption.

  • Electrical power generation capacity where the population and industry are changing.













Feedforward provides rapid compensation for disturbances. The continuous feedforward compensation described for process control might not be appropriate where the "
costs of adjustments" are substantial.  Describe a modified feedforward strategy for the systems below.


  • Chemical process control when changing an extruder requires stopping production.
  • Social Systems providing health care facilities and personnel.
  • Ecological systems correcting for effects of global warming.