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Feedback control system

  • US 7,679,306 B2
  • Filed: 03/15/2007
  • Issued: 03/16/2010
  • Est. Priority Date: 03/16/2006
  • Status: Expired due to Fees
First Claim
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1. Test apparatus for testing a moveable member subject to a load in use, the apparatus comprising:

  • a load actuator to apply a load to the moveable member,a load controller that controls operation of the load actuator so as to apply a predetermined load to the moveable member as it is moved, anda damping controller that is responsive to a condition of the moveable member as it is moved and that generates a corresponding damping signal to control the damping effect of the load actuator on movement of the moveable member,whereinthe load controller includes a load sensor that senses the load applied by the load actuator to the moveable member and generates a load feedback signal, a load command generator that generates a load command signal dependent upon the position of the moveable member, and a comparator that combines the load feedback signal and load command signal to generate a load control signal that determines the load applied by the load actuator.

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