# US 9,752,642 B2 · Tunable vibration dampers and methods of manufacture and tuning

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- Number: US 9,752,642 B2
- Document ID: US9752642B2
- Status: Granted
- Kind: B2
- Application number: 14/484,210
- Filed: 2014-09-11
- Published: 2014-12-25
- Granted: 2017-09-05
- Earliest claimed: 2010-12-29
- Assignees: Newport Corporation
- Applicants: Newport Corporation
- Inventors: Vyacheslav M. Ryaboy
- Web page: https://patentgrep.com/patent/US9752642B2

## CPC

- F16F 15/02: Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems ({F16F15/005 takes precedence } ; layered products B32B; suppression of vibration in ships B63; {relieving load on bearings, using magnetic means F16C39/06})
- B23P 6/00: Restoring or reconditioning objects (straightening or restoring form of sheet metal, metal rods, metal tubes, metal profiles, or specific articles made therefrom B21D1/00, B21D3/00; repairing defective or damaged objects by casting techniques B22D19/10)
- F16F 7/104: the inertia member being resiliently mounted {(F16F7/1022 takes precedence)}
- F16F 7/116: on metal springs
- G01M 5/0066: {by exciting or detecting vibration or acceleration (vibration testing of structures G01M7/00)}
- Y10T 29/49718: Repairing
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Embodiments are directed to tunable damper embodiments and methods of using the same for damping resonant and non-resonant vibrations present within an object that the tunable damper is secured to. In some cases, the tunable damper may be tuned before, during or after being secured to an object.

## Claims

### Claim 1

A method of damping an object, comprising:
a. providing a tunable damper assembly including:
i. a frame that provides structural rigidity between a base plate and a cover plate,
ii. a moveable damper mass disposed in the frame between the base plate and cover plate,
iii. a flexible mass engaging member configured to elastically support the movable damper mass,
iv. a mass engaging device disposed between the flexible mass engaging member and moveable damper mass, and
v. a load mechanism operatively coupled to a load plate and an engaging member support such that the load mechanism, load plate and engaging member support are configured to apply a biasing force to the flexible mass engaging member and adjust the mechanical compliance of the mass engaging member, the engaging member support comprising a sloped surface which allows for a change in a contact area between the sloped surface and a highly damped element as a result of a change in the biasing force with the highly damped element being disposed on the flexible mass engaging member between the engaging member support and the flexible mass engaging member;
b. determining a resonance frequency of the object;
c. adjusting the load mechanism to match a resonance frequency range of the tunable damper assembly and the resonance frequency of the object so as to change the effective flexibility of the flexible mass engaging member by changing the contact area between the sloped surface and the highly damped element; and
d. securing the tunable damper assembly to the object.

### Claim 2 (depends on 1)

The method of claim 1, wherein adjusting the load mechanism comprises turning a threaded member of the load mechanism so as to adjust the biasing force to the mass engaging member and adjust the mechanical compliance of the mass engaging member.

### Claim 3 (depends on 1)

The method of claim 1 wherein securing the tunable damper assembly to the object comprises securing the tunable damper assembly to an optical table.

### Claim 4 (depends on 1)

The method of claim 1 further comprising reducing the effective flexibility of the flexible mass engaging member by increasing the contact area between the sloped surface and the highly damped element.

### Claim 5 (depends on 1)

The method of claim 1 further comprising locking a lock mechanism after adjusting the load mechanism to match a resonance frequency range of the tunable damper assembly and the resonance frequency of the object.

### Claim 6 (depends on 1)

The method of claim 1 wherein adjusting the load mechanism to match a resonance frequency range of the tunable damper assembly and the resonance frequency of the object further comprises accessing the load mechanism through an access port which is in communication with the load mechanism.