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Tracking Control for Optical Manipulation With Adaptation of Trapping Stiffness
IEEE Transactions on Control Systems Technology, 2016In the optical manipulation problem of biological cells, the optical trap works only in a small neighborhood around the centroid of a focused light beam. Due to the Gaussian distribution of light intensity, the trapping stiffness is dependent on the distance between the cell and the centroid of the laser beam.
Xiang Li 0009, Chien Chern Cheah
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Force and position tracking: parallel control with stiffness adaptation
IEEE Control Systems, 1998Force and position control strategies are aimed at handling the interaction of a robot manipulator with the environment. Among them, the parallel force/position control approach offers good performance in the face of uncertainty on the geometry of the contact surface.
S. CHIAVERINI +2 more
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Evaluation of Track Support Stiffness and Track Impact factor for Ballast and Concrete Type Tracks
Journal of the Korean Society for Railway, 2018궤도지지강성은 열차하중에 대한 궤도구조의 정, 동적 지지성능을 나타내는 궤도성능 및 품질 평가의 지표로서, 궤도구조형식 별로 다양한 특성치를 갖는 특정 궤도시스템의 고유특성이며, 궤도시스템별 구조특성 및 탄성범위와 선로구조물, 접속부 등 선로조건에 직접적인 영향을 받는다. 궤도충격계수는 열차속도에 따라 변화하는 동적 하중에 의한 영향을 고려하는 궤도해석 및 설계의 주요변수로, 동적 윤중변동률의 확률론적 해석으로 산출되며, 열차주행에 따라 변동되는 차륜-레일의 상호작용력 수준과 궤도구조에 작용하는 동적하중의 증폭수준을 평가할 수 있다.
Gwang-Tae Noh +3 more
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Effect of Foundation Stiffness on Track Buckling
Journal of the Engineering Mechanics Division, 1976The present paper deals with the effect of releasing the constraining assumption of using an infinitely rigid foundation in the analysis of vertical buckling of a railroad track due to constrained thermal expansion. The chosen foundation is of the Winkler type.
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Retracted: Influence of Track Support Stiffness of Railway Tracks on Track Impact Factor
Journal of Engineering Mechanics, 2014AbstractTrack support stiffness (TSS) is used as a quality index of railway tracks to assess their performance and bearing capacity. TSS depends on the elastic stiffness of the elastic materials and the structural characteristics of the track system. The theoretically designed track impact factor (TIF), which is used to design ballasted and slab tracks
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The Effect of Track Stiffness on Track Performance
2013What is track stiffness? There is not a complete consensus on definitions of track stiffness. The most general understanding defines track stiffness as the elastic rail deflection that takes place under a wheel loading.
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Behaviour of train–track interaction in stiffness transitions
Proceedings of the Institution of Civil Engineers - Transport, 2012In the present study, the problem of railway stiffness transitions, for example, railway tracks near bridge abutments or tunnels, was investigated numerically in terms of track deterioration and passenger comfort utilising two types of analysis. The first analysis employed a train–transition curve model which simulates the response of the train to ...
Meysam Banimahd +3 more
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Continuous assessment of the stiffness of tracks at line speed
5th IET Conference on Railway Condition Monitoring and Non-Destructive Testing (RCM 2011), 2011Track sub-structural stiffness is a major factor in the deterioration of track geometric quality as a result of the rail traffic that passes over it. Whilst track geometric quality has been measured at normal line speed for many years, determination of the condition of the substructure has only been possible at discrete locations using stationary ...
J. Amoore +4 more
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Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 2010 This article investigates the effect of vertical track stiffness, and its variations along the track, on track performance with focus on dynamic responses of the track due to parametric excitations. Two approaches for calculating global track stiffness,
M X D Li, E G Berggren
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Tracking Controller for Systems Containing a Stiff Nonlinearity
IFAC Proceedings Volumes, 1993Abstract In this paper, we present a method for designing a robust tracking controller for systems containing a nondifferentiable nonlinearitiy. It is also assumed that state variables are only partially observable for feedback and so the controller must be based on the observable vector only.
Dong H. Chyung +2 more
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