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Design and evaluation of a hybrid passive–active knee prosthesis on energy consumption
- Source :
- Mechanical Sciences, Vol 11, Pp 425-436 (2020)
- Publication Year :
- 2020
- Publisher :
- Copernicus GmbH, 2020.
-
Abstract
- The existing lower limb prostheses with passive knees have disadvantages, causing an asymmetric gait and higher metabolic cost during level walking which is in contrast with a normal gait. However, most existing active knee prostheses need a significant amount of energy. In this paper, a novel hybrid passive–active knee prosthesis (HPAK) that allows passive and active operating modes is proposed, which contains an active motor unit and a novel hydraulic damper with an electrically controlled valve that adjusts the damping torque dynamically during each gait cycle. An energy consumption model was built to evaluate the energy consumption when walking on level ground in three different simulation conditions to, respectively, simulate the complete HPAK, an ordinary active prosthesis (AKP) and an ordinary passive prosthesis (PKP). The results show that, in a cycle, the HPAK consumes only 16.19 J, which is 3.6 times lower than the AKP (58.95 J), and the PKP consumes only 1.24 J due to the novel spring–hydraulic damper structure designed and presented in this paper. These results indicate that the proposed novel hybrid passive–active knee prosthesis can have a positive effect on reducing energy consumption and improving the approximation of healthy gait characteristics when walking on level ground, contrasting with active or passive knee prostheses.
- Subjects :
- 0209 industrial biotechnology
Computer science
medicine.medical_treatment
02 engineering and technology
Prosthesis
Industrial and Manufacturing Engineering
Damper
020901 industrial engineering & automation
Gait (human)
0203 mechanical engineering
Knee prosthesis
lcsh:TA401-492
medicine
Damping torque
Simulation
Civil and Structural Engineering
Fluid Flow and Transfer Processes
Mechanical Engineering
Energy consumption
Metabolic cost
020303 mechanical engineering & transports
Mechanics of Materials
Control and Systems Engineering
lcsh:Materials of engineering and construction. Mechanics of materials
human activities
Energy (signal processing)
Subjects
Details
- ISSN :
- 2191916X
- Volume :
- 11
- Database :
- OpenAIRE
- Journal :
- Mechanical Sciences
- Accession number :
- edsair.doi.dedup.....6cdbf01c1a257268690c072be104e359