Designing a closed loop system to achieve real-time evaluation and manipulation of state anxiety while walking in virtual reality

A robust nonfragile observer-based controller for a linear time-invariant system with structured uncertainty is introduced. The [Formula: see text] robust stability of the closed-loop system is guaranteed by use of the Lyapunov theorem in the presence of undesirable disturbance. For the sake of addressing the fragility problem, independent sets of time-dependent gain-uncertainties are assumed to be existing for the controller and the observer elements. In order to satisfy the arbitrary H2-normed constraints for the control system and to enable automatic determination of the optimal [Formula: see text] bound of the performance functions in disturbance rejection control, additional necessary and sufficient conditions are presented in a linear matrix equality/inequality framework. The [Formula: see text] observer-based controller is then transformed into an optimization problem of coupled set of linear matrix equalities/inequality that can be solved iteratively by use of numerical software such as Scilab. Finally, concerning the evaluation of the performance of the controller, the control system is implemented in real time on a mechanical system, aiming at vibration suppression. The plant under study is a multi-input single-output clamped-free piezo-laminated smart beam. The nominal mathematical reduced-order model of the beam with piezo-actuators is used to design the proposed controller and then the control system is implemented experimentally on the full-order real-time system. The results show that the closed-loop system has a robust performance in rejecting the disturbance in the presence of the structured uncertainty and in the presence of the unmodeled dynamics.

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Simple closed-loop system for real-time optical phase measurement

Optics Letters ◽

10.1364/ol.4.000131 ◽

1979 ◽

Vol 4 (5) ◽

pp. 131 ◽

Cited By ~ 24

Author(s):

Arthur D. Fisher ◽

Cardinal Warde

Keyword(s):

Real Time ◽

Closed Loop ◽

Phase Measurement ◽

Loop System ◽

Closed Loop System ◽

Optical Phase

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An Event-Driven Closed-Loop System for Real-Time FES Control

2019 26th IEEE International Conference on Electronics, Circuits and Systems (ICECS) ◽

10.1109/icecs46596.2019.8965153 ◽

2019 ◽

Author(s):

Fabio Rossi ◽

Paolo Motto Ros ◽

Sofia Cecchini ◽

Andrea Crema ◽

Silvestro Micera ◽

...

Keyword(s):

Real Time ◽

Closed Loop ◽

Loop System ◽

Closed Loop System ◽

Event Driven

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New Digital Method of Reverse Engineering about Free from Surface

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.295-297.1065 ◽

2011 ◽

Vol 295-297 ◽

pp. 1065-1069 ◽

Cited By ~ 1

Author(s):

Xue Ming He ◽

Ying Xue ◽

Cheng Gang Li ◽

Chen Liang Hua ◽

Yi Lu

Keyword(s):

Reverse Engineering ◽

Real Time ◽

Surface Reconstruction ◽

Closed Loop ◽

Measuring Method ◽

Loop System ◽

Reconstruction Method ◽

Closed Loop System ◽

Reconstructed Surface ◽

Time Update

In this paper, it is proposed a new method of free-from surface’s reverse engineering, making data acquisition and surface reconstruction form closed loop system, solving no feedback problems in the measuring and modeling process, shortening the time of the whole reverse engineering, improving the quality of reconstructed models. The core of this paper is used the CMM adaptive measuring method and non-uniform b-spline surface reconstruction method, integrating the free-from surface measuring and modeling in a closed loop system, realizing the CMM real-time online measurement and reconstructed surface real-time update.

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