Feedback control system
First Claim
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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Accused Products
Abstract
A closed loop control system for controlling an actuator operating on a moveable member, includes a control device controlling operation of the actuator, a sensor responsive to a condition such as loading of the moveable member as it is moved by the actuator and adapted to generate a corresponding feedback control signal SL, and a damping device having a damping effect on the response of the actuator to the feedback control signal, the damping effect being varied in accordance with the movement of the moveable member so as to vary the response of the actuator. The damping effect is increased in the region of stationary states to render the system more stable, and reduced therebetween to make the system more responsive at increased speeds, and thereby more conformal to a required performance profile. The position or velocity of the moveable member can be used to control the damping effect, or a timer can be used to control the damping effect.
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Citations
7 Claims
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1. Test apparatus for testing a moveable member subject to a load in use, the apparatus comprising:
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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, and a 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, wherein the 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification