Design optimization of a knee joint for an active transfemoral prosthesis for weight reduction

Ahn, Hyoung-Jong; Lee, Kwang-Hee; Lee, Chulhee

doi:10.1007/s12206-017-1134-9

Cited by 9 publications

(5 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, if papers contained significant criteria and (additionally) structural performance criteria, this was recorded. The criterion which appeared most frequently (16 hits) in this dimension was improve working performance; either to improve the acceleration of a production machine (inter alia Schleinkofer et al, 2018), to improve the handling of a product or the ergonomics of a prosthesis (Ahn et al, 2017). When improving performance by reducing the mass of a product, lightweight design usually comes with higher costs, which are tolerated to a certain extent (Friedrich, 2017).…”

Section: Figure 3 Papers With References To Criteria For Identifyingmentioning

confidence: 99%

Derivation of Criteria for Identifying Lightweight Potential – A Literature Review

Laufer¹,

Roth²,

Binz³

2019

Proc. Int. Conf. Eng. Des.

View full text Add to dashboard Cite

Lightweight potential is a powerful indicator – but not as powerful as it could be. Current methods for analyzing a product's potential to be reduced in mass only deal with a few of the most important criteria for lightweight design. The amount of literature dealing with lightweight design is significant, yet it can help to understand these versatile criteria. Firstly, the literature on this topic will therefore be reviewed to derive a broad set of criteria used in contemporary lightweight design. Secondly, a further review will reveal the criteria used to derive lightweight potential. Subsequently, both sets will be compared to identify the missing criteria used for the derivation of lightweight potential. This will support designers in two ways. On the one hand, matching and combining both criteria sets will enable the most representative criteria for a particular design case to be chosen, thus leading to a more comprehensible derivation of lightweight potential. On the other hand, the combination set will provide a basis for designers and design teams to refine their understanding of their own motivations for conducting lightweight design.

show abstract

Section: Figure 3 Papers With References To Criteria For Identifyingmentioning

confidence: 99%

Derivation of Criteria for Identifying Lightweight Potential – A Literature Review

Laufer¹,

Roth²,

Binz³

2019

Proc. Int. Conf. Eng. Des.

View full text Add to dashboard Cite

show abstract

“…In [11], a powered prosthetic knee actuated by brushless dc motor and a hierarchical finite state machine control approach is presented. Ahn et al [12] discussed the optimization problem for the degree-of-freedom active knee joint actuated by a flat brushless DC electric motor for overcoming complex walking environment. The first commercial active prosthetic knee was the Ossur power knee, which utilized an echo-control strategy to mimic the movements of the subject's strong side leg.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Robust Force Position Control for Flexible Active Prosthetic Knee Using Gait Trajectory

et al. 2020

View full text Add to dashboard Cite

Active prosthetic knees (APKs) are widely used in the past decades. However, it is still challenging to make them more natural and controllable because: (1) most existing APKs that use rigid actuators have difficulty obtaining more natural walking; and (2) traditional finite-state impedance control has difficulty adjusting parameters for different motions and users. In this paper, a flexible APK with a compact variable stiffness actuator (VSA) is designed for obtaining more flexible bionic characteristics. The VSA joint is implemented by two motors of different sizes, which connect the knee angle and the joint stiffness. Considering the complexity of prothetic lower limb control due to unknown APK dynamics, as well as strong coupling between biological joints and prosthetic joints, an adaptive robust force/position control method is designed for generating a desired gait trajectory of the prosthesis. It can operate without the explicit model of the system dynamics and multiple tuning parameters of different gaits. The proposed model-free scheme utilizes the time-delay estimation technique, sliding mode control, and fuzzy neural network to realize finite-time convergence and gait trajectory tracking. The virtual prototype of APK was established in ADAMS as a testing platform and compared with two traditional time-delay control schemes. Some demonstrations are illustrated, which show that the proposed method has superior tracking characteristics and stronger robustness under uncertain disturbances within the trajectory error in ± 0 . 5 degrees. The VSA joint can reduce energy consumption by adjusting stiffness appropriately. Furthermore, the feasibility of this method was verified in a human–machine hybrid control model.

show abstract

“…Active prostheses have been proposed to advance functionality beyond the limits of passive prostheses (Ahn et al, 2017;Rupar et al, 2017;Pieringer et al, 2017). Sup et al (2009) designed a self-contained anthropomorphic active knee prosthesis.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, active prostheses provide the capability to perform activities with active power, but substantial deficiencies due to energy consumption, weight and battery life, in turn, decrease their acceptability and clinical feasibility (Park et al, 2016). Novel designs are required to lower the energy consumption of active prostheses while still allowing wearers to complete a wider variety of activities than traditional passive prostheses (Andrade et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Design and evaluation of a hybrid passive–active knee prosthesis on energy consumption

Wang¹,

Meng²,

Zhang³

et al. 2020

Mech. Sci.

View full text Add to dashboard Cite

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.

show abstract

Design optimization of a knee joint for an active transfemoral prosthesis for weight reduction

Cited by 9 publications

References 17 publications

Derivation of Criteria for Identifying Lightweight Potential – A Literature Review

Derivation of Criteria for Identifying Lightweight Potential – A Literature Review

Adaptive Robust Force Position Control for Flexible Active Prosthetic Knee Using Gait Trajectory

Design and evaluation of a hybrid passive–active knee prosthesis on energy consumption

Contact Info

Product

Resources

About