Adjustable force damper for passive vibration control
First Claim
1. A structure comprising:
- a mass, the mass having at least a first surface and a second surface, the mass being arranged to transfer vibratory energy; and
a vibration damper, the vibration damper including a force adjuster, the vibration damper further including a first energy dissipator and a second energy dissipator, the vibration damper being positioned about the mass such that the first energy dissipator is in contact with the first surface of the mass and the second energy dissipator is in contact with the second surface of the mass, the first energy dissipator and the second energy dissipator being arranged to absorb the vibratory energy transferred by the mass, wherein the force adjuster is arranged to adjust force on the first energy dissipator and force on the second energy dissipator.
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Accused Products
Abstract
Methods and apparatus for damping out vibrations associated with a structure are disclosed. According to one aspect of the present invention, a structure includes a mass and a vibration damper. The mass has a first surface and a second surface, and is arranged to transfer vibratory energy. The vibration damper includes a force adjuster, as well as a first energy dissipator and a second energy dissipator. The vibration damper is positioned about the mass so that the first energy dissipator is in contact with the first surface and the second energy dissipator is in contact with the second surface. The first energy dissipator and the second energy dissipator absorb the vibratory energy transferred by the mass, while the force adjuster adjusts force on the first energy dissipator and force on the second energy dissipator. In one embodiment, the mass is a beam.
13 Citations
34 Claims
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1. A structure comprising:
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a mass, the mass having at least a first surface and a second surface, the mass being arranged to transfer vibratory energy; and
a vibration damper, the vibration damper including a force adjuster, the vibration damper further including a first energy dissipator and a second energy dissipator, the vibration damper being positioned about the mass such that the first energy dissipator is in contact with the first surface of the mass and the second energy dissipator is in contact with the second surface of the mass, the first energy dissipator and the second energy dissipator being arranged to absorb the vibratory energy transferred by the mass, wherein the force adjuster is arranged to adjust force on the first energy dissipator and force on the second energy dissipator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A structure comprising:
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a mass, the mass having at least a first surface and a second surface, the mass being arranged to transfer vibratory energy, the vibratory energy being arranged to cause the mass to vibrate; and
a force damper, the force damper including a first absorber and a second absorber, the force damper being positioned about the mass such that the first absorber is in contact with the first surface of the mass when the force damper applies a first force to the first surface of the mass and the second absorber is in contact with the second surface of the mass when the force damper applies a second force to the second surface of the mass, the first absorber and the second absorber being arranged to absorb the vibratory energy transferred by the mass when the force damper applies the first force and the second force, wherein the first force substantially opposes the second force. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A stage assembly suitable for use in wafer processing, comprising:
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a base;
a stage;
a mount, the mount being coupled to the base, the mount being arranged to transfer vibratory energy, the mount having a first surface and a second surface;
a sensor, the sensor being coupled to the mount, the sensor being arranged to measure a position of the stage; and
a force damper, the force damper including a first absorber and a second absorber, the force damper being positioned about the mount such that the first absorber is in contact with the first surface of the mount when the force damper applies a first force to the first surface of the mount and the second absorber is in contact with the second surface of the mount when the force damper applies a second force to the second surface of the mount, the first absorber and the second absorber being arranged to absorb the vibratory energy transferred by the mount when the force damper applies the first force and the second force, wherein the first force substantially opposes the second force. - View Dependent Claims (21, 22, 23, 25, 26, 27, 29, 30)
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24. A stage assembly, comprising:
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a stage, the stage being arranged to transfer vibratory energy, the stage having a first surface and a second surface; and
a force damper, the force damper including a first absorber and a second absorber, the force damper being positioned about the stage such that the first absorber is in contact with the first surface of the stage when the force damper applies a first force to the first surface of the stage and the second absorber is in contact with the second surface of the stage when the force damper applies a second force to the second surface of the stage, the first absorber and the second absorber being arranged to absorb the vibratory energy transferred by the stage when the force damper applies the first force and the second force, wherein the first force substantially opposes the second force.
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28. A method for suppressing vibrations in a structure, the structure including a mass, the mass having a first surface and a second surface, the mass having vibratory energy, the method comprising:
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providing a first absorber on the first surface;
providing a second absorber on the second surface;
applying a first force to the first absorber, the first force having a first magnitude, wherein the first absorber is arranged to absorb a first amount of the vibratory energy; and
applying a second force to the second absorber, the second force having a second magnitude, the second magnitude being approximately equal to the first magnitude, wherein the second absorber is arranged to absorb a second amount of the vibratory energy.
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31. A method for positioning an object, the method comprising:
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moving the object along a predetermined direction;
measuring a position of the object using a sensor connected to a sensor mount;
applying a first force to a first surface of the sensor mount, the first force having a first magnitude; and
applying a second force to a second surface of the sensor mount, the second force having a second magnitude that is substantially equal to the first magnitude. - View Dependent Claims (32, 33, 34)
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Specification