نتایج جستجو برای: uncertain kinematics

تعداد نتایج: 86110  

Abstract: Using robot manipulators for high accuracy applications require precise value of the kinematics parameters. Since measurement of kinematics parameters are usually associated with errors and accurate measurement of them is an expensive task, automatic calibration of robot link parameters makes the task of kinematics parameters determination much easier. In this paper a simple and easy ...

2002
Pengcheng Shi Huafeng Liu

A stochastic finite element method (SFEM) based framework is proposed for the simultaneous estimation of cardiac kinematics functions and material model parameters. While existing biomechanics studies of myocardial material constitutive laws have assumed known kinematics, and image analyses of cardiac kinematics have relied on chosen constraining models (mathematical or mechanical), we believe ...

2010
Chien Chern Cheah Saing Paul Hou Yu Zhao Jean-Jacques E. Slotine

In force control applications of robots, it is difficult to obtain an exact model of a constraint surface. In presence of the constraint uncertainty, the robot needs to adapt to the uncertainty in external parameters due to the environment, in addition to the uncertainties in internal parameters of the robot kinematics and dynamics. In this paper, a visually servoed adaptive controller is propo...

2002
Huafeng Liu Edward W. B. Lo Pengcheng Shi

There have been many efforts using image analysis algorithms to study cardiac kinematics, or using biomechanics strategies to study myocardial material properties. In this paper, we propose a novel stochastic mechanics strategy and an extended Kalman filter (EKF) computational framework to estimate the cardiac kinematics functions and material model parameters simultaneously, given a particular...

Uncertainty theory is a mathematical methodology for dealing withnon-determinate phenomena in nature. As we all know, uncertainprocess and uncertain integral are important contents of uncertaintytheory, so it is necessary to have deep research. This paperpresents the definition and discusses some properties of strongcomonotonic uncertain process. Besides, some useful formulas ofuncertain integr...

Journal: :Foot & ankle international 2017
Daniel R Sturnick Constantine A Demetracopoulos Scott J Ellis Robin M Queen Jayme C B Kolstov Jonathan T Deland Josh R Baxter

BACKGROUND Arthrodesis is an effective and reliable treatment for end-stage ankle arthritis; however, many patients develop ipsilateral adjacent joint arthritis following surgery. The mechanism that drives adjacent joint arthritis remains uncertain. Cadaveric simulation permits direct investigation of the effects of both arthrodesis and movement strategy on adjacent joints during simulated walk...

Journal: :Journal of neurophysiology 2011
Angela L Hewitt Laurentiu S Popa Siavash Pasalar Claudia M Hendrix Timothy J Ebner

Encoding of movement kinematics in Purkinje cell simple spike discharge has important implications for hypotheses of cerebellar cortical function. Several outstanding questions remain regarding representation of these kinematic signals. It is uncertain whether kinematic encoding occurs in unpredictable, feedback-dependent tasks or kinematic signals are conserved across tasks. Additionally, ther...

Journal: :iranian rehabilitation journal 0
hassan shakeri tehran university of medical sciences, tehran, iran. roshanak keshavarz university of social welfare and rehabilitation sciences, tehran, iran. amir masoud arab university of social welfare and rehabilitation sciences, tehran, iran. farhad tabatabai ghosheh university of kashan, kashan, iran. ailin talimkhani university of social welfare and rehabilitation sciences, tehran, iran.

objectives: the purpose of this study was to compare scapular kinematics during elevation phase of abduction, flexion, and scapular plane elevation phase between fifteen persons with shoulder impingement syndrome (sis) and thirteen persons without it. methods: values of scapular kinematics include scapular superior and lateral translations, upward rotation, external rotation, and posterior tipp...

اکبرزاده توتونچی, علیرضا, خوشرفتار, ناهید, مقیمی, سحر, کلانی, هادی,

Many efforts have been done in recent years to decrease the required time for analysis of FKP (Forward Kinematics Problem) of parallel robots.This paper starts with developing kinematics of a parallel robot and finishes with a suggested algorithm to solve forward kinematics of robots. In this paper, by combining the artificial neural networks and a 3rd-order numerical algorithm, an improved ...

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