Electromagnetic active vibration control system and electromagnetic actuator
First Claim
1. A low frequency vibration control system, comprising:
- an electromagnetic actuator for selectively applying forces to a controlled structure, said actuator consisting essentially of an armature, a magnet coil and a flux sensor; and
a digital control system for causing a force-linearized flux to be generated in a gap between said armature and said magnetic coil, as a function of sensed vibration; and
wherein said flux sensor sends signals to said digital control system representative of the flux generated in said gap between said armature and said magnetic coil.
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Abstract
A multi-sensor, multi-actuator control system for controlling vibration in a mechanical structure. The system employs feedforward and feedback control strategies in tandem. Outputs from adaptive feedforward and modal feedback control loops are added to each other. The control system may be dynamically adapted to the changing physical characteristics of the controlled structure. For example, the plant transfer function estimates for the feedforward unit and the gain for the feedback unit may be calculated as functions of sensed physical parameters (location, mass, etc.), and the plant transfer function estimates may be dynamically modified to reflect time-varying feedback control gains. If desired, the control system may be used to cancel low frequency vibrations (<20 Hz) in industrial processes. The actuators may be formed of electromagnets, fixed armatures and interposed flux sensors. In a preferred embodiment of the invention, the robust actuators are sealed so as to be impervious to fluids and dust.
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Citations
22 Claims
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1. A low frequency vibration control system, comprising:
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an electromagnetic actuator for selectively applying forces to a controlled structure, said actuator consisting essentially of an armature, a magnet coil and a flux sensor; and
a digital control system for causing a force-linearized flux to be generated in a gap between said armature and said magnetic coil, as a function of sensed vibration; and
wherein said flux sensor sends signals to said digital control system representative of the flux generated in said gap between said armature and said magnetic coil. - View Dependent Claims (2, 3)
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4. A vibration control system for a variable-state structure, said system comprising:
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electromagnetic actuators for selectively applying forces to said variable-state structure; and
a digital control system for operating said actuators as a function of sensed vibration of said variable-state structure, sensed vibration of a feedforward reference, and the variable state of said variable-state structure. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 20, 21, 22)
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13. A method of controlling vibration of a variable-state structure, said method comprising the steps of:
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obtaining first data representative of the vibration of said variable-state structure;
obtaining second data representative of variable mechanical characteristics of said variable-state structure; and
selectively applying electromagnetic forces to said variable-state structure as a function of said first data and said second data.
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19. A vibration control system, comprising:
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an actuator for applying a force to a variable-state structure, said actuator including an electromagnet, an armature and a magnetic flux density sensor, and wherein said magnetic flux density sensor is operatively located so as to sense the magnetic flux between said electromagnet and said armature;
a data input device for inputting data representative of the variable state of said variable-state structure; and
a processor for applying signals to said electromagnet, said processor being operatively connected to said data input device and said magnetic flux density sensor.
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Specification