Apparatus and methods for determining balance of a cylindrical vehicle

• US 5,168,749 A
• Filed: 08/28/1991
• Issued: 12/08/1992
• Est. Priority Date: 08/28/1991
• Status: Expired due to Fees

• Current Assignee: The United States of America As Represented By The Secretary of Agriculture
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Nugent, David M.
• Primary Examiner(s): Goldstein, Herbert
• Assistant Examiner(s): DOUGHERTY, ELIZABETH L
• Application Number:
  US07/750,998
• Time in Patent Office: 468 Days
• Field of Search: 73/65
• US Class Current: 73/65.04
• CPC Class Codes: G01M 1/12 Static balancing; Determining position of centre of gravity by determining imbalance G01M1/14
• CPC Class Codes: G01M 1/122 Determining position of centre of gravity

Abstract

Apparatus and methods for determining balance of a cylindrical vehicle, thepparatus comprising a frame adapted for horizontal disposition, first and second support assemblies mounted on the frame for receiving the vehicle, first and second load cells mounted, respectively, on the first and second support assemblies, whereby upon placement of the vehicle on the support assemblies the load cells are adapted to provide readings indicative of the weight of the vehicle, from which may be determined the center of gravity of the vehicle. A torsion cell assembly is mounted on the frame and adapted for connection to the vehicle and for providing indications of righting moment and static heel of the vehicle.

Claims

1. Apparatus for determining balance of a cylindrical vehicle, said apparatus comprising a frame oriented in a horizontal disposition, first and second cradles mounted on said frame and moveable vertically for engaging and for supporting said vehicle, said first and second cradles being connected to and extending from, respectively, first and second load cells on said frame, whereby upon vertical movement of said cradles with engagement and support of said vehicle by said first and second cradles, with said first and second load cells each a selected distance from a forward end of said vehicle, said loadcells are adapted to provide readings indicative of the weight of said vehicle from which may be determined the lengthwise center of gravity of said vehicle.

2. The apparatus in accordance with claim 1 wherein said first cradle and said first load cell are disposed in a first support assembly, said second cradle and said second load cell are disposed in a second support assembly, said first support assembly upstands from said frame proximate and removed from a first end of said frame, and said second support assembly upstands from said frame further removed from said first end of said frame.

3. The apparatus in accordance with claim 2 wherein said first and second support assemblies are respectively provided with first and second receiving means, said first receiving means being adapted to receive a forward portion of said vehicle and said second receiving means being adapted to receive an after portion of said vehicle and wherein said cradles are adapted to be moved to and retained in a position below said receiving means whereby said receiving means supports said vehicle, and are adapted to be moved to and retained in a second position elevated above said receiving means whereby said cradles are adapted to lift said vehicle off said receiving means for supporting said vehicle independently of said receiving means.

4. The apparatus in accordance with claim 3 wherein each of said receiving means comprises rollers adapted to receive said vehicle, axes of said rollers being parallel to the axis of said vehicle when said vehicle is disposed on said rollers.

5. The apparatus in accordance with claim 3 wherein each of said receiving mean comprises first and second rollers adapted for rotation about parallel axes of equal distance from said frame, said first and second rollers being in side by side alignment and adapted to receive said vehicle such that said forward portion of said vehicle is disposed on said first and second rollers of said first receiving means and said after portion of said vehicle is disposed on said first and second rollers of said second receiving means.

6. The apparatus in accordance with claim 4 wherein said apparatus further comprises mounting means upstanding from said frame closer to said first end of said frame than said first support assembly, a torsion load cell assembly mounted on said mounting means, said torsion load cell assembly comprising first locking means for fixing said forward end of said vehicle to said torsion load cell assembly, turning tool receiving means for engagement with a tool by which portions of said torsion load cell assembly, including said first locking means, and thereby said vehicle fixed thereto, may be turned, second locking means for locking said vehicle at a selected turned position, and torque sensor means in said assembly for providing an indication of the force required to turn said vehicle to said selected position, from which may be determined the righting moment of said vehicle.

7. The apparatus in accordance with claim 6 wherein said torsion load cell assembly is subject to a biasing force engendered by said vehicle having a propensity to return to a generally upright position, such that upon turning of said torsion load cell assembly said biasing force urges movement of said vehicle, and thereby said torsion load cell assembly, to a position of equilibrium, and upon release of said second locking means, said vehicle and said torsion load cell assembly move in response to said bias to said position of equilibrium, indicator means for display of degrees difference between said position of equilibrium and a selected ideal upright position, whereby to provide an indication of static heel of said vehicle.

8. Apparatus for determining balance of a cylindrical vehicle, said apparatus comprising a frame adapted for horizontal disposition, first and second support assemblies mounted on said frame for receiving said vehicle, said support assemblies being adapted to support said vehicle for rotation thereon about the axis of said vehicle, a torsion load cell assembly mounted on said frame, first locking means on said load cell assembly for attachment to said vehicle, turning tool receiving means on said load cell assembly for engagement by a tool by which portions of said load cell assembly, including said first locking means, and thereby said vehicle, may be turned, second locking means for holding said load cell assembly and said vehicle at a selected turned position, and torque sensor means in said load cell assembly for providing an indication of the force required to turn said vehicle to said selected position, from which may be determined the righting moment of said vehicle.

9. The apparatus in accordance with claim 8 wherein said first support assembly upstands from said frame proximate and removed from a first end of the frame, and said second support assembly upstands from said frame further removed from said first end of said frame.

10. The apparatus in accordance with claim 9 wherein said first and second support assemblies are respectively provided with first and second receiving means, said first receiving means being adapted to receive a forward portion of said vehicle and said second receiving means being adapted to receive an after portion of said vehicle.

11. The apparatus in accordance with claim 10 wherein each of said receiving means comprises rollers adapted to receive said vehicle, axes of said rollers being parallel to the axis of said vehicle when said vehicle is disposed on said rollers.

12. The apparatus in accordance with claim 11 wherein said rollers of each of said receiving means comprise first and second rollers, said axes of said rollers being of equal distance from said frame, said first and second rollers being in side by side alignment.

13. The apparatus in accordance with claim 10 wherein said torsion load cell assembly is subject to a biasing means engendered by said vehicle seeking return to its upright position of equilibrium, such that upon turning of said torsion load cell assembly a force generated by said biasing means urges return of said vehicle, and thereby said torsion load cell assembly, to a position of equilibrium, and upon release of said second locking means said vehicle and said torsion cell assembly move in response to said bias to said position of equilibrium.

14. The apparatus in accordance with claim 13 and further comprising indicator means for display of degrees of difference between said position of equilibrium and a selected position, whereby to provide an indication of static heel of said vehicle.

15. Apparatus for determining balance of a cylindrical vehicle, said apparatus comprising a frame adapted for horizontal disposition, a first support assembly upstanding from said frame proximate and removed from a first end of said frame, a second support assembly upstanding from said frame proximate a second end of said frame, each of said first and second support assemblies including first and second rollers, said first and second rollers being adapted for rotation about parallel axes of equal distance from said frame, said first and second rollers being in side by side alignment, and a torsion load cell assembly mounted on said frame, said torsion load cell assembly comprising means for fixing a forward end of said vehicle to said torsion load cell assembly, turning tool receiving means by which portions of said torsion load cell assembly and said vehicle fixed thereto may be turned on said rollers, locking means for locking said vehicle at a selected turned position, and torque sensor means for providing an indication of force required to turn said vehicle, from which may be determined the righting moment of said vehicle.

16. Apparatus for determining balance of a cylindrical vehicle, said apparatus comprising a frame adapted for horizontal disposition, a first support assembly upstanding from said frame proximate and removed from a first end of said frame, a second support assembly upstanding from said frame further removed from said first end of said frame than said first support assembly, each of said support assemblies including roller means for supporting a vehicle and permitting rotation of said vehicle thereon, turning means for rotating said vehicle on said roller means for determining righting moment and static heel, and each of said support assemblies including cradle means movable from a first position removed from said vehicle to a second position in which said cradle means support said vehicle removed from and raised over said rollers for determining weight and lengthwise center of gravity of said vehicle.

17. The apparatus in accordance with claim 16 wherein said apparatus further comprises turning tool receiving means mounted on said frame to facilitate turning of said vehicle on said rollers.

18. A method for determining weight of a generally cylindrical vehicle, said method comprising providing a substantially horizontal frame, mounting first and second cradles on said frame, mounting first and second receiving means on said frame for receiving said vehicle, providing said first and second cradles, respectively, with first and second load cells adapted to indicate weight placed upon the respective cradles, moving said cradles from positions beneath the level of the receiving means into vehicle supporting positions above the level of said receiving means, to remove the vehicle from the receiving means, and adding the weight indications of said first and second cradles.

19. A method for determining weight and lengthwise center of gravity of a generally cylindrical vehicle, said method comprising providing a substantially horizontal frame, maintaining said frame in a fixed horizontal disposition, fixing first and second load cells on said frame, providing first and second cradles, respectively, extending from said first and second load cells, providing means on said frame for receiving said vehicle, moving said cradles to lift said vehicle off said receiving means, said load cells being adapted to indicate weight supported by the respective cradles, determining the distance of said first load cell from an end of said vehicle, determining the distance of said second load cell from said end of said vehicle, and by using the weight indication of said first load cell and the distance of said first load cell from said end of said vehicle, and the weight indication of said second load cell and the distance of said second load cell from said end of said vehicle, computing the lengthwise position of said center of gravity of said vehicle in terms of distance from said end of said vehicle.

20. A method for determining righting moment of a generally cylindrical vehicle, said method comprising providing a substantially horizontal frame, mounting first and second support assemblies on said frame, providing said support assemblies with roller means for receiving said vehicle and facilitating turning of said vehicle about its axis on said roller means, mounting a torsion load cell assembly on said frame, providing first locking means on said assembly and therewith locking said assembly to an end of said vehicle, providing turning tool receiving means on said assembly, applying a turning tool to said turning tool receiving means to turn portions of said assembly and said vehicle through a selected number of degrees, and providing indicating means on said assembly for indicating the force required for said turn of said vehicle, determining the radius of said vehicle, and multiplying said radius by said force to obtain said righting moment.

21. The method for determining righting moment in accordance with claim 20 and further including providing a second locking means for holding said assembly and said vehicle in its turned position.

22. A method for determining static heel of a generally cylindrical vehicle, said method comprising providing a substantially horizontal frame, mounting first and second support assemblies on said frame, providing said support assemblies with roller means for receiving said vehicle and facilitating turning of said vehicle about its axis, mounting a vehicle turning means on said frame and connecting said turning means to said vehicle, operating said turning means to rotate said vehicle a selected number of degrees from an ideal upright position, holding said vehicle in its rotated position and releasing said vehicle such that said vehicle seeks a position of equilibrium and of its own accord turns to said position of equilibrium, and providing means for indicating the degrees difference between said ideal upright position and said position of equilibrium, thereby to provide an indication of static heel.