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Analyzing and Considering Inertial Effects in Powered Lower Limb Prosthetic Design

Beckerle, Philipp and Wojtusch, Janis and Seyfarth, André and Stryk, Oskar von and Rinderknecht, Stephan (2015):
Analyzing and Considering Inertial Effects in Powered Lower Limb Prosthetic Design.
In: Proceedings of IEEE International Conference on Rehabilitation Robotics, In: IEEE International Conference on Rehabilitation Robotics, Singapore, 11 - 14 August 2015, [Conference or Workshop Item]

Abstract

Powered lower limb prostheses are designed to restore the biomechanical functionality of missing parts of their users’ bodies. However, they do not yet meet the versatility and efficiency of the biological counterpart. A crucial open issue is how the prosthetic system and its actuator should be designed to achieve an energy efficient operation. This paper proposes a novel methodology for the design and optimization of elastically actuated lower limb prostheses. In contrast to other studies, actuator inertia is considered in this paper. Further, the approach considers the inertial parameters of the prosthesis after initial design to revise the requirements and redesign the system. The design procedure is described and presented for the example of a powered prosthetic knee. In this, considering actuator inertia enables to find optimal stiffness values for walking that are not to be found with common methods and altered optimal values for other gait types. Further, the consideration of the inertial properties of the pre-designed prosthesis in a gait simulation lead to distinctly lower requirements for peak power. For walking those are decreased by about 10% while in running a reduction of over 30% is observed. Analyzing those results, the potential of considering actuator and prosthetic inertia in design and thus the benefits due to the presented method are pointed out.

Item Type: Conference or Workshop Item
Erschienen: 2015
Creators: Beckerle, Philipp and Wojtusch, Janis and Seyfarth, André and Stryk, Oskar von and Rinderknecht, Stephan
Title: Analyzing and Considering Inertial Effects in Powered Lower Limb Prosthetic Design
Language: English
Abstract:

Powered lower limb prostheses are designed to restore the biomechanical functionality of missing parts of their users’ bodies. However, they do not yet meet the versatility and efficiency of the biological counterpart. A crucial open issue is how the prosthetic system and its actuator should be designed to achieve an energy efficient operation. This paper proposes a novel methodology for the design and optimization of elastically actuated lower limb prostheses. In contrast to other studies, actuator inertia is considered in this paper. Further, the approach considers the inertial parameters of the prosthesis after initial design to revise the requirements and redesign the system. The design procedure is described and presented for the example of a powered prosthetic knee. In this, considering actuator inertia enables to find optimal stiffness values for walking that are not to be found with common methods and altered optimal values for other gait types. Further, the consideration of the inertial properties of the pre-designed prosthesis in a gait simulation lead to distinctly lower requirements for peak power. For walking those are decreased by about 10% while in running a reduction of over 30% is observed. Analyzing those results, the potential of considering actuator and prosthetic inertia in design and thus the benefits due to the presented method are pointed out.

Title of Book: Proceedings of IEEE International Conference on Rehabilitation Robotics
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Mechatronic Systems in Mechanical Engineering (IMS)
20 Department of Computer Science
20 Department of Computer Science > Simulation, Systems Optimization and Robotics Group
Interdisziplinäre Forschungsprojekte
Zentrale Einrichtungen
Interdisziplinäre Forschungsprojekte > Forschungsprojekte Prothetik
Event Title: IEEE International Conference on Rehabilitation Robotics
Event Location: Singapore
Event Dates: 11 - 14 August 2015
Date Deposited: 28 Aug 2015 15:08
Identification Number: BeckerleICORR:2015
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