Claims
- 1. A nutation damper for a high-speed spinning body comprising:
- a hollow ring-shaped container installed concentrically to the axis of spin of a high-speed spinning body and rotating therewith, and
- a viscous liquid fluid sealed inside, and partially filling, the container so as to leave a gap, said viscous fluid having a volume which is determined as less than or equal to 1/2 of the volume enclosed by the outer wall of said container, said container containing only said viscous liquid fluid, except for said gap.
- wherein said viscous fluid has a viscosity of more than or equal to 1.0 cSt with little fluctuation of viscosity with temperature and is one from the group consisting of a silicone oil and a fluorinated oil,
- whereby a circumferential wave is formed in said viscous fluid during rotation of said spinning body and nutation energy is damped by said centrifugal wave when the centrifugal wave frequency matches the nutation frequency.
- 2. The nutation damper according to claim 1 wherein said viscous fluid is a silicone oil liquid having a viscosity of more than or equal to 1.0 cSt.
- 3. The nutation damper according to claim 2 wherein said silicone oil liquid is methyl silicone.
- 4. The nutation damper according to claim 1 wherein said viscous fluid is a fluorinated oil liquid.
- 5. A nutation damper according to claim 4 wherein said fluorinated oil liquid is perfluoro polyether.
- 6. The nutation damper according to claim 4 wherein said fluorinated oil liquid is perfluoroalkyl polyether.
- 7. The nutation damper according to claim 4 wherein said fluorinated oil liquid is ethylene chloride trifluoride.
- 8. A nutation damper for a high-speed spinning body comprising:
- a hollow ring-shaped container installed concentrically to the axis of spin of a high-speed spinning body and rotating therewith, and
- a viscous liquid fluid sealed inside, and partially filling, the container so as to leave a gap, said viscous fluid having a volume which is determined as less than or equal to 1/2 of the volume enclosed by the outer wall of said container, said container containing only said viscous liquid fluid, except for said gap,
- wherein said viscous fluid has a viscosity of more than or equal to 5 cSt with little fluctuation of viscosity with temperature,
- whereby a circumferential wave is formed in said viscous fluid during rotation of said spinning body and nutation energy is damped by said centrifugal wave when the centrifugal wave frequency matches the nutation frequency.
- 9. The nutation damper of claim 8 wherein said viscous fluid has a viscosity of at least 10 cSt.
Priority Claims (1)
Number |
Date |
Country |
Kind |
61-63216 |
Mar 1986 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 026,195, filed Mar. 16, 1987, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
2403478 |
Burnat |
Jul 1946 |
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3716206 |
Lynch et al. |
Feb 1973 |
|
Foreign Referenced Citations (3)
Number |
Date |
Country |
0140941 |
Aug 1982 |
JPX |
1303813 |
Jan 1973 |
GBX |
2100388 |
Dec 1982 |
GBX |
Non-Patent Literature Citations (2)
Entry |
Ehrich, F. F. (1967), The Influence of Trapper Fluids on High Speed Rotor Vibration, Trans. ASME., vol. 89, Ser. B, No. 4, pp. 806-812. |
Wolf, J. A. Jr., (1968), Whirl Dynamics of a Rotor Partially Filled with Liquid, Trans. ASME., vol. 35, Ser. E, No. 4, pp. 676-682. |
Continuations (1)
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Number |
Date |
Country |
Parent |
26195 |
Mar 1987 |
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