Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Nonlinear Damper Model for the Quantification of joint Mechanical Properties

관절계 역학적 특성의 정량화를 위한 비선형 댐퍼모델

  • 엄광문 (건국대학교 의과대학 의학공학부) ;
  • 이창한 (건국대학교 의과대학 의학공학부) ;
  • 김철승 (건국대학교 의과대학 의학공학부) ;
  • 허지운 (건국대학교 의과대학 의학공학부)
  • Published : 2005.04.01
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Abstract

The purpose of this paper is to develop a more precise damper model of the joint for the quantification of the joint mechanical properties. We modified the linear damper model of a knee joint model to nonlinear one. The normalized RMS errors between the simulated and measured joint angle trajectories during passive pendulum test became smaller with the nonlinear damper model than those of the linear one which indicates the nonlinear damper model is better in precision and accuracy. The error between the experimental and simulated knee joint moment also reduced with the nonlinear damper model. The reduction in both the trajectory error and the moment error was significant at the latter part of the pendulum test where the joint angular velocity was small. The nonlinearity of the damper was significantly greater at thin subject group and this indicates the nonlinearity is a useful index of joint mechanical properties.

Keywords

References

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