DYNAMIC COUPLING CHARACTERISTICS OF A SEMI-ACTIVE KNEE PROSTHESIS

Conventional designs of an above-knee prosthesis are based on mechanisms with mechanical properties (such as friction, spring and damping coefficients) that remain constant during changing cadence. These designs are unable to replace natural legs due to the lack of active knee joint control. Since the nonlinear and time-varying dynamic coupling between the thigh and the prosthetic limb is high during swing phase, an adaptive control is employed to control the knee joint motion. Two dimensional simulation indicates that the adaptive controller can improve the appearance of gait pattern. It is adaptable to walking speed and can compensate for the variations of hip moment, hip trajectory and toe-off conditions.

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Dynamic Coupling Characteristics of the Crankshaft System

DEStech Transactions on Environment Energy and Earth Science ◽

10.12783/dteees/edep2016/5947 ◽

2017 ◽

Author(s):

Yi-Ping LI

Keyword(s):

Dynamic Coupling ◽

Coupling Characteristics

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Dynamic Coupling Characteristics of Slender Suspension Footbridges with Wind-Resistant Ropes

Dynamics and Control of Advanced Structures and Machines ◽

10.1007/978-3-319-90884-7_21 ◽

2019 ◽

pp. 193-204

Author(s):

Y. B. Yang ◽

J. D. Yau

Keyword(s):

Dynamic Coupling ◽

Coupling Characteristics

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Research on Dynamic Coupling Characteristics of Electrostatic Actuated Micro Beam Considering Gas Film Damping

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.411.437 ◽

2011 ◽

Vol 411 ◽

pp. 437-441

Author(s):

Wei Dong Wang ◽

Xiang Ji ◽

Xiang Yu Niu

Keyword(s):

Reynolds Equation ◽

Rarefied Gas ◽

System Modeling ◽

Great Influence ◽

Linear Vibration ◽

Dynamic Coupling ◽

Small Deflection ◽

Vibration Model ◽

Modified Reynolds Equation ◽

Coupling Characteristics

It has been proved by large number of experiments that gas film damping has great influence on MEMS structures. Based on the elastic and material mechanics, this paper built a linear-vibration model for the electrostatic actuated micro-beam. According to the rarefied gas dynamics theory, a kind of modified Reynolds equation is adopted in the system modeling. In view of the study on small deflection of micro-beam has been investigated already by many researchers, this paper focus the research on large beam deflections, i.e. the mid-point deflection can be compared with the thickness of the gas film. The dynamic characteristics of micro-beam are investigated through coupling the dynamic vibration equation with the modified Reynolds equation. Through the finite difference method, the discrete form of the coupled dynamic equations has been obtained.

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