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Actuation Selection for Assistive Exoskeletons: Matching Capabilities to Task Requirements
Summary
Designers can optimize assistive exoskeleton actuators by combining motors, gears, and elastic elements. This approach reduces actuator oversizing, leading to lighter and more effective assistive devices for tasks like lifting.
Area of Science:
- Robotics
- Biomechanics
- Mechanical Engineering
Background:
- Selecting actuators for assistive exoskeletons presents conflicting design requirements.
- Oversized actuators increase system weight and reduce transparency, hindering device adoption.
- Parallel elastic elements can reduce actuator torque and power demands.
Purpose of the Study:
- To introduce a methodology for evaluating actuator selection in assistive exoskeletons.
- To assess combinations of motors, reduction gears, and parallel stiffness profiles.
- To match actuator capabilities with specific task requirements.
Main Methods:
- Development of a graphical tool to visualize design choices and their impact on the overall actuator.
- Analysis of actuator performance considering motor, gear, and parallel stiffness parameters.
- Case study application to a back-support exoskeleton for lifting tasks.
Main Results:
- The methodology provides a systematic approach to actuator selection.
- Design choices significantly influence the overall actuator characteristics.
- The graphical tool aids in understanding trade-offs between different component combinations.
Conclusions:
- The proposed methodology facilitates informed actuator selection for assistive exoskeletons.
- Integrating parallel elastic elements is a viable strategy to mitigate actuator oversizing.
- Optimized actuator design is crucial for developing lightweight, transparent, and effective assistive devices.
