# US 11,078,984 B1 · Structure movement damping system using tension element

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- Number: US 11,078,984 B1
- Document ID: US11078984B1
- Status: Granted
- Kind: B1
- Application number: 17/063,319
- Filed: 2020-10-05
- Granted: 2021-08-03
- Earliest claimed: 2020-10-05
- Applicants: United States of America as represented by the Administrator of NASA
- Inventors: Frederick Scott Gant; Robert E. Berry; W. Neill Myers; Jeffrey Lee Lindner; John S. Townsend
- Web page: https://patentgrep.com/patent/US11078984B1

## CPC

- F16F 15/022: {using dampers and springs in combination}
- F16F 15/1201: {for damping of axial or radial, i.e. non-torsional vibrations (F16F15/13107 takes precedence)}
- F16F 2222/04: Friction
- F16F 2222/06: Magnetic or electromagnetic
- F16F 2222/12: Fluid damping
- F16F 2232/02: Rotary
- F16F 2232/08: Linear
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION

## Abstract

A damping system includes a spool about which a tension line is wound. The line's first end is coupled to a first structure subject to forces causing unwanted movement thereof. A damper is coupled to a second structure not subject to the unwanted movement of the first structure. The damper is coupled to the spool for engagement with the spool to slow a rotational speed thereof when the spool rotates in a first direction. The damper is disengaged from the spool when the spool rotates in a second direction in opposition to the first direction. A device, coupled to the line's second end and to the second structure, applies a tension force to the line's second end. The tension force is exceeded when the first structure moves to place the line in tension, and is not exceeded when the first structure moves to place the line in compression.

## Claims

### Claim 1

A damping system for structures, comprising:
a spool;
a line for exhibiting rigidity in tension and flexibility in compression, said line including a first end adapted to be coupled to a first structure subject to forces causing unwanted movement thereof, said line wound around said spool and extending to a second end of said line;
a one-way clutch coupled to said spool for rotation therewith;
a shaft coupled to said clutch wherein said shaft is engaged for rotation therewith when said spool and said clutch rotate in a first direction as caused by said line being in tension, and wherein said shaft is disengaged from said clutch when said spool and said clutch rotate in a second direction in opposition to said first direction as caused by said line being in compression;
a damper coupled to said shaft for slowing rotational speed of said shaft rotating in said first direction; and
a spring coupled to said second end of said line and adapted to be coupled to a second structure not subject to the unwanted movement of the first structure, said spring applying a tension force to said second end of said line, wherein said tension force is exceeded when the first structure moves to place said line in tension, and wherein said tension force is not exceeded when the first structure moves to place said line in compression.

### Claim 2 (depends on 1)

A damping system as in claim 1, wherein said damper comprises a rotating damper.

### Claim 3

A damping system for structures, comprising:
a spool;
a line for exhibiting rigidity in tension and flexibility in compression, said line including a first end adapted to be coupled to a first structure subject to forces causing unwanted movement thereof, said line wound around said spool and extending to a second end of said line;
a one-way clutch coupled to said spool for rotation therewith;
a shaft coupled to said clutch wherein said shaft is engaged for rotation therewith when said spool and said clutch rotate in a first direction, and wherein said shaft is disengaged from said clutch when said spool and said clutch rotate in a second direction in opposition to said first direction;
a damper coupled to said shaft for slowing rotational speed of said shaft rotating in said first direction, wherein said damper comprises a plurality of linear dampers; and
a spring coupled to said second end of said line and adapted to be coupled to a second structure not subject to the unwanted movement of the first structure, said spring applying a tension force to said second end of said line, wherein said tension force is exceeded when the first structure moves to place said line in tension, and wherein said tension force is not exceeded when the first structure moves to place said line in compression.

### Claim 4 (depends on 3)

A damping system as in claim 3, further comprising a support structure coupled to said shaft for supporting said rotation thereof, said support structure being isolated from the unwanted movement of the first structure.

### Claim 5 (depends on 3)

A damping system as in claim 3, wherein said line is wound around said spool in a single-layer wrap.

### Claim 6

A damping system for structures, comprising:
a spool;
a line for exhibiting rigidity in tension and flexibility in compression, said line including a first end adapted to be coupled to a first structure subject to forces causing unwanted movement thereof, said line wound around said spool and extending to a second end of said line;
a damper adapted to be coupled to a second structure not subject to the unwanted movement of the first structure, said damper coupled to said spool for engagement with said spool to slow a rotational speed thereof when said spool rotates in a first direction and for disengagement from said spool when said spool rotates in a second direction in opposition to said first direction, wherein said damper comprises a plurality of linear dampers; and
a device coupled to said second end of said line and adapted to be coupled to the second structure, said device applying a tension force to said second end of said line, wherein said tension force is exceeded when the first structure moves to place said line in tension, and wherein said tension force is not exceeded when the first structure moves to place said line in compression.

### Claim 7 (depends on 6)

A damping system as in claim 6, wherein said line is wound around said spool in a single-layer wrap.

### Claim 8 (depends on 6)

A damping system as in claim 6, wherein said device comprises a spring.

### Claim 9

A damping system for structures, comprising:
a spool;
a line for exhibiting rigidity in tension and flexibility in compression, said line including a first end adapted to be coupled to a first structure subject to forces causing unwanted movement thereof, said line wound around said spool and extending to a second end of said line;
a one-way clutch coupled to said spool for rotation therewith;
a shaft adapted to be mechanically and rotationally supported at a second structure not subject to the unwanted movement, said shaft coupled to said clutch wherein said shaft is engaged for rotation therewith when said spool and said clutch rotate in a first direction, and wherein said shaft is disengaged from said clutch when said spool and said clutch rotate in a second direction in opposition to said first direction;
a damper coupled to said shaft for slowing rotational speed of said shaft rotating in said first direction, wherein said damper comprises a plurality of linear dampers; and
a spring coupled to said second end of said line and adapted to be coupled to a second structure not subject to the unwanted movement of the first structure, said spring applying a constant tension force to said second end of said line, wherein said constant tension force is exceeded when the first structure moves to place said line in tension, and wherein said constant tension force is not exceeded when the first structure moves to place said line in compression.

### Claim 10 (depends on 9)

A damping system as in claim 9, wherein said line is wound around said spool in a single-layer wrap.