Force bias device for an actuator system
The present disclosure discusses an active seating system that includes a load leveling mechanism. The load leveling mechanism includes a force bias actuator assembly, a roll actuator assembly, a heave actuator assembly, a first torsion rod connected to the force bias actuator and the roll actuator, and a second torsion rod connected to the force bias actuator and the heave actuator. Each of the force bias actuator assembly, roll actuator assembly, and heave actuator assemblies comprises a housing, a DC motor disposed within the housing, and a ball screw with a driveshaft, the driveshaft of the ball screw being coaxial with a rotor of the DC motor. The active seating system also includes a seat top and an interface configured to mount the seat top to the load leveling mechanism.
1. An active seat suspension system, comprising:
a load leveling mechanism, comprising:
a force bias actuator assembly comprising a force bias actuator;
a roll actuator assembly comprising a roll actuator;
a heave actuator assembly comprising a heave actuator;
a first torsion rod connected to the force bias actuator and the roll actuator; and
a second torsion rod connected to the force bias actuator and the heave actuator;
a seat top; and
an interface configured to mount the seat top to the load leveling mechanism;
wherein each of the force bias actuator assembly, the roll actuator assembly, and the heave actuator assembly comprises a housing, a DC motor disposed within the housing, and a ball screw with a driveshaft, the driveshaft of the ball screw being coaxial with a rotor of the DC motor.
2. The active seat suspension system of claim 1 , wherein the load leveling mechanism is configured to support a mass of approximately 35 kg to 180 kg.
3. The active seat suspension system of claim 1 , wherein at least one of the force bias actuator, the roll actuator, and the heave actuator are non-backdriveable.
4. The active seat suspension system of claim 1 , wherein the force bias actuator is configured to wind the first torsion rod and the second torsion rod.
5. The active seat suspension system of claim 4 , wherein the force bias actuator is configured to wind the first torsion rod in a clockwise direction and the second torsion rod in a counterclockwise direction.
6. The active seat suspension system of claim 1 , wherein the force bias actuator is mounted on a floating reference.
7. The active seat suspension system of claim 1 , wherein the force bias actuator is configured to apply a preload to return a running average force output of the roll actuator and the heave actuator to zero.
8. The active seat suspension system of claim 1 , wherein at least one selected from the force bias actuator assembly, the roll actuator assembly, and the heave actuator assembly occupies a volume of between approximately 400 cc to 600 cc as the at least one selected from the force bias actuator assembly, the roll actuator assembly, and the heave actuator assembly moves between a compressed state and an extended state.
9. The active seat suspension system of claim 1 , wherein an effective spring rate at the seat top is configured to be between approximately 25 N/mm and 90 N/mm.
10. A load leveling mechanism, comprising;
a force bias actuator assembly comprising a force bias actuator;
a roll actuator assembly comprising a roll actuator;
a heave actuator assembly comprising a heave actuator;
a first torsion rod connected to the force bias actuator and the roll actuator; and
a second torsion rod connected to the force bias actuator and the heave actuator;
wherein each of the force bias actuator assembly, the roll actuator assembly, and the heave actuator assembly comprises a housing, a DC motor disposed within the housing, and a ball screw with a driveshaft, the driveshaft of the ball screw being coaxial with a rotor of the DC motor.
11. The load leveling mechanism of claim 10 , wherein the load leveling mechanism has an effective spring rate of between approximately 25 N/mm and 90 N/mm.
12. The load leveling mechanism of claim 10 , wherein at least one of the force bias actuator, the roll actuator, and the heave actuator are non-backdriveable.
13. The load leveling mechanism of claim 10 , wherein the force bias actuator is configured to wind the first torsion rod and the second torsion rod.
14. The load leveling mechanism of claim 13 , wherein the force bias actuator is configured to wind the first torsion rod in a clockwise direction and the second torsion rod in a counterclockwise direction.
15. The load leveling mechanism of claim 10 , wherein the force bias actuator is mounted on a floating reference.
16. The load leveling mechanism of claim 10 , wherein the force bias actuator is configured to apply a preload to return a running average force output of the roll actuator and the heave actuator to zero.
17. The load leveling mechanism of claim 10 , wherein at least one selected from the force bias actuator assembly, the roll actuator assembly, and the heave actuator assembly occupies a volume of between approximately 400 cc to 600 cc as the at least one selected from the force bias actuator assembly, the roll actuator assembly, and the heave actuator assembly moves between its compressed state and its extended state.
18. An active seat suspension system, comprising:
a load leveling mechanism, comprising:
a force bias actuator assembly comprising a force bias actuator;
a roll actuator assembly comprising a roll actuator;
a heave actuator assembly comprising a heave actuator;
a first torsion rod connected to the force bias actuator and the roll actuator; and
a second torsion rod connected to the force bias actuator and the heave actuator;
a seat top; and
an interface configured to mount the seat top to the load leveling mechanism, wherein the force bias actuator is mounted on a floating reference.
19. The active seat suspension system of claim 18 , wherein the force bias actuator is configured to move proportional with roll motions.
20. The active seat suspension system of claim 18 , wherein each of the force bias actuator assembly, roll actuator assembly, and heave actuator assemblies comprises a housing, a DC motor disposed within the housing, and a ball screw with a driveshaft, the driveshaft of the ball screw being coaxial with a rotor of the DC motor.
21. The active seat suspension system of claim 18 , wherein at least one of the force bias actuator, the roll actuator, and the heave actuator are non-backdriveable.
22. The active seat suspension system of claim 18 , wherein the force bias actuator is configured to wind the first torsion rod and the second torsion rod.
23. The active seat suspension system of claim 22 , wherein the force bias actuator is configured to wind the first torsion rod in a clockwise direction and the second torsion rod in a counterclockwise direction.
24. The active seat suspension system of claim 18 , wherein the force bias actuator is configured to apply a preload to return a running average force output of the roll actuator and the heave actuator to zero.
25. The active seat suspension system of claim 18 , wherein at least one selected from the force bias actuator assembly, the roll actuator assembly, and the heave actuator assembly occupies a volume of between approximately 400 cc to 600 cc as the at least one selected from the force bias actuator assembly, the roll actuator assembly, and the heave actuator assembly moves between its compressed state and its extended state.
26. The active seat suspension system of claim 18 , wherein an effective spring rate at the seat top is configured to be between approximately 25 N/mm and 90 N/mm.
27. The active seat suspension system of claim 18 , wherein the load leveling mechanism is configured to support a mass of approximately 35 kg to 180 kg.
28. An active seat suspension system, comprising:
a load leveling mechanism, comprising:
a force bias actuator assembly comprising a force bias actuator;
a roll actuator assembly comprising a roll actuator;
a heave actuator assembly comprising a heave actuator;
a first torsion rod connected to the force bias actuator and the roll actuator;
a second torsion rod connected to the force bias actuator and the heave actuator;
a seat top; and
an interface configured to mount the seat top to the load leveling mechanism, wherein the force bias actuator is configured to apply a preload to return a running average force output of the roll actuator and the heave actuator to zero.
29. The active seat suspension system of claim 28 , wherein the load leveling mechanism is configured to support a mass of approximately 35 kg to 180 kg.
30. The active seat suspension system of claim 28 , wherein each of the force bias actuator assembly, roll actuator assembly, and heave actuator assemblies comprises a housing, a DC motor disposed within the housing, and a ball screw with a driveshaft, the driveshaft of the ball screw being coaxial with a rotor of the DC motor.
31. The active seat suspension system of claim 28 , wherein at least one of the force bias actuator, the roll actuator, and the heave actuator are non-backdriveable.
32. The active seat suspension system of claim 28 , wherein the force bias actuator is configured to wind the first torsion rod and the second torsion rod.
33. The active seat suspension system of claim 32 , wherein the force bias actuator is configured to wind the first torsion rod in a clockwise direction and the second torsion rod in a counterclockwise direction.
34. The active seat suspension system of claim 28 , wherein the force bias actuator is mounted on a floating reference.
35. The active seat suspension system of claim 28 , wherein at least one selected from the force bias actuator assembly, the roll actuator assembly, and the heave actuator assembly occupies a volume of between approximately 400 cc to 600 cc as the at least one selected from the force bias actuator assembly, the roll actuator assembly, and the heave actuator assembly moves between its compressed state and its extended state.
36. The active seat suspension system of claim 28 , wherein an effective spring rate at the seat top is configured to be between approximately 25 N/mm and 90 N/mm.