FORCE BALANCING MOBILE ROBOT AND ROBOTIC SYSTEM

• US 20120130540A2
• Filed: 05/21/2009
• Published: 05/24/2012
• Est. Priority Date: 05/21/2008
• Status: Abandoned Application

• Current Assignee: Georgia Tech Research Corporation (University System of Georgia)
• Original Assignee: Georgia Tech Research Corporation (University System of Georgia)
• Inventors: Stilman, Michael
• Application Number:
  US12/993,650
• Publication Number:
  US 20110071677A1
• Time in Patent Office: Days
• US Class Current: 700/254
• CPC Class Codes: B25J 19/002 using counterweights
• CPC Class Codes: B25J 5/007 mounted on wheels
• CPC Class Codes: B25J 9/0084 comprising a plurality of manipulators

Abstract

A force balancing robotic system and related methods are disclosed. The robotic system can include a body, a balancing member, and a balancing system. The robotic system can be statically unstable, which can be a result of having a statically unstable body. The balancing member can be connected to the body by a joint. The balancing system can have one or more sub-systems utilized to dynamically balance the robotic system. Such subsystems can include a repositioning system, an accelerating system, and a driving system. The repositioning system can reposition the balancing members to position the center of mass over a target. The accelerating system can accelerate the balancing members to produce a target torque. The driving system can drive the wheels of the robotic system to maintain balance. While retaining balance, the robotic system can absorb external force and apply forces to external objects.

Claims

1. A statically unstable self-balancing robotic system comprising:

one or more balancing members; and

a balancing system for providing dynamic stability to the robotic system while the robotic system maintains an approximately constant velocity across a surface, the balancing system repeatedly repositioning at least one of the balancing members to move the center of mass of the robotic system to a target, wherein the target is selected to balance the robotic system.

2. The self-balancing robotic system of claim 1, the balancing system selecting a first subset of the balancing members for repositioning, and retaining a second subset of the balancing members at their current positions.

3. The self-balancing robotic system of claim 1, the balancing system calculating a target torque for balancing the robotic system.

4. The self-balancing robotic system of claim 3, the balancing system accelerating the balancing member to produce the target torque on the robotic system.

5. The self-balancing robotic system of claim 1, the balancing system utilizing feedback linearization to determine how to reposition the balancing members.

6. The self-balancing robotic system of claim 1, wherein the balancing system calculates how to reposition the balancing members by mapping a desired velocity vector of the center of mass of the robotic system to a set of target member velocity vectors for the balancing members.

8. The self-balancing robotic system of claim 1, the balancing system configured to prioritize repositioning of a first balancing member over repositioning of a second balancing member.

9. The self-balancing robotic system of claim 1, the balancing system applying a set of weights to the balancing members corresponding to contributions of each balancing member to repositioning of the center of mass.

7. (canceled)

10. (canceled)

11. A statically unstable self-balancing robotic system comprising:

one or more balancing members; and

a balancing system for providing dynamic stability to the robotic system while the robotic system maintains an approximately constant velocity across a surface, the balancing system repeatedly accelerating at least one of the balancing members to produce a target torque on the robotic system, wherein the target torque is calculated to balance the robotic system.

12. The self-balancing robotic system of claim 11, further comprising a wheeled ground-contacting assembly for supporting the robotic system over a surface.

14. The self-balancing robotic system of claim 12, the ground-contacting assembly comprising no more than two wheels.

15. The self-balancing robotic system of claim 12, further comprising a base, wherein the balancing system drives the ground-contacting assembly to repeatedly reposition the base under the center of mass of the robotic system.

18. The self-balancing robotic system of claim 11, further comprising a sensing system for sensing indicia of a pitch of a portion of the robotic system, the sensing system comprising at least one of the group consisting of a gyroscope and an accelerometer.

19. The self-balancing robotic system of claim 11, further comprising a force sensor for sensing an external force applied to the robotic system, wherein the balancing system is configured to produce an equal and opposite force of the external force to retain balance of the robotic system.

21. The self-balancing robotic system of claim 11, wherein the approximately constant velocity of the robotic system across the surface has a magnitude of approximately zero.

22. The self-balancing robotic system of claim 11, the approximately constant velocity of the robotic system being selectable by a user.

24. The self-balancing robotic system of claim 11, the balancing members being arranged in serial and connected together by arm joints to form an articulated arm.

26. The self-balancing robotic system of claim 11, the balancing members being controllable by two or more actuators.

29. The self-balancing robotic system of claim 11, further comprising a body from which at least one of the balancing members extends, the body comprising:

a base;

a torso; and

a waist joint coupled to a waist actuator, the waist joint moveably attaching the torso to the base of the body.

13. (canceled)

16. (canceled)

17. (canceled)

20. (canceled)

23. (canceled)

25. (canceled)

27. (canceled)

28. (canceled)

30. (canceled)

31. (canceled)

32. A statically unstable robotic system having a constant velocity, the robotic system comprising:

one or more balancing members;

a first state in which the center of mass of the robotic system is stable;

a second state in which the center of mass of the robotic system is unstable, wherein stability is restored to the center of mass by moving the center of mass to a target.

33-47. -47. (canceled)