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Hydraulic Ankle Foot Orthosis: First Platform

Hydraulic Ankle Foot Orthosis: First Platform. Torque: 90 N-m (600 lbs force for a 3cm moment arm) Small packaging space Weight: < 1 kg Portability: untethered Longevity: 10,000 steps Peak power: 250 W. Artist rendering.

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Hydraulic Ankle Foot Orthosis: First Platform

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  1. Hydraulic Ankle Foot Orthosis: First Platform Torque: 90 N-m (600 lbs force for a 3cm moment arm) Small packaging space Weight: < 1 kg Portability: untethered Longevity: 10,000 steps Peak power: 250 W Artist rendering

  2. Many System Level Questions Need to Be Answered Before Specifying Each Component Electric Motor Battery Pump Conduits Actuators Piston? or Vane? Long? or Short? Linear? or Rotary? Gearhead? or Not?

  3. The Efficiency and Weight of Each Component Can Be Modeled Analytically Gear-head Efficiency Electric DC Motor Weight Hydraulic Cylinder Weight Axial-Piston Pump Efficiency

  4. The Established Efficiency and Weight Models Can Identify the AFO Configuration Power Pack

  5. Design Variables Can Be Expressed by Known Parameters* Pump displacement (cc/rev): Num. of pistons Pitch radius Pump piston area (m^2): Swash-plate angle Pump piston bore (m): Pump efficiency: * Key pump design variable: pump displacement, pump piston bore and pump efficiency. To simplify the design problem, other pump parameters were adopted from the three-piston Oildyne pump.

  6. Design Variables Can Be Plotted on P-n Plot

  7. The Hydraulic AFO Components Can Be Specified Based on the Design Map

  8. Conclusions System level analyses are necessary to identify the design guidelines for the hydraulic AFO. The analytical efficiency and weight models for the system level analyses are achievable. For the hydraulic AFO, the actuators would better be separated from the power source, similar to an excavator. The analytical efficiency and weight models are also needed to specify each component in the hydraulic AFO system.

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