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A New Identification Method Based on open loop Step response of Overdamped System

REVISTA IBEROAMERICANA DE AUTOMATICA E INFORMATICA INDUSTRIAL 2017年第1期14卷 31-43页

作者： Mora, Luis A. Amaya, Jhon E. Univ Nacl Expt Tachira Lab Instrumentac Control & Automatizac Av Univ San Cristobal 5001 Venezuela Univ Nacl Expt Tachira Lab Comp Alto Rendimiento Av Univ San Cristobal 5001 Venezuela

In this paper a new process identification method based in open loop step response of overdamped systems is presented. Initially the transient behavior of transfer functions with multiple real poles is analyzed, establishing analytical formulas to estimate the time it takes for these systems to reach certain points of his reaction curve to stimuli of the step type, including settling time for error criteria of 2 % and 5 %. Subsequently developed a method of identification using 3 points characteristic of the reaction curve (t(k), y(k)), allowing estimate the order process N, the time constant T of multiple poles and delay time L of the approximate model. To evaluate the performance of the proposed method, 3 minimum phase and 1 non mimium phase transfer functions are used to compare the proposed method with other of identification methods found in the literature, as well as also, one model of a non-isothermal chemical reactor;establishing as efficiency index the root mean square error (RMSE) of the transient response and the frequency resposne of the identified models with respect to the original transfer functions with different signal to noise ratio (SNR) values. From the results obtained show that the proposed method achieves excellent approximation of the transient responses and frequency compared to other methods. From the results, it was observed that the proposed method obtains good approximations of the transient and frequency responses, being a simple method and requires a low computational load compared with others methods.

关键词： Process Identification Step function responses Multiple realpoles Root mean square error Transient responses Signal-to-noise ratio open-loop response Step input

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Unraveling Negative Feedback Translations: Gains, Peaking, Stability, and loop Variations

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 2025年第3期72卷 454-458页

作者： Zhao, Tiancheng Rincon-Mora, Gabriel A. Georgia Inst Technol Sch Elect & Comp Engn Atlanta GA 30332 USA

This brief develops a quick, precise, and insightful method for analyzing the closed-loop frequency response, peaking, and stability of complex negative feedback systems. loop variations are explored to simplify analysis for complex feedback loops. The proposed method improves on the state-of-the-art by emphasizing circuit intuition, reducing algebraic complexity, simplifying complex feedback loops, while preserving the accuracy of the exact solution. The result shows that the closed-loop response follows the lowest forward translation across frequencies, verified by SPICE and MATLAB simulations.

关键词： Gain Feedback loop Poles and zeros Negative feedback Frequency response Circuit stability Stability criteria Steady-state Oscillators Mathematical models frequency response transfer function closed-loop response loop gain stability peaking open-loop response poles zeros phase margin

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An open source model of a parabolic trough solar field

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COMPUTERS & CHEMICAL ENGINEERING 2019年 125卷 514-531页

作者： Lin, Bosong Wiesner, Theodore Texas Tech Univ Dept Chem Engn Lubbock TX 79409 USA

Commercial simulation software for solar plants is readily available, but source codes are not. Many articles in the open literature give governing equations and algorithms for solar plant simulations, but adopters must program them themselves. This paper presents an open-source, ready-to-run, model of a parabolic trough solar field with a user-friendly interface in the Simulink (R) environment. The intention is to provide a foundational tool for the solar thermal research community, similar to the Tennessee Eastman Challenge Problem employed for chemical processes. The flow rate of the heat transfer fluid (HTF) and the angle of incidence are the manipulated variables of the model. The size of the solar field may be altered. Both open- and closed-loop responses to disturbances may be investigated. The source code of the model is freely available at the open Educational Resource Commons (URL: https://***/courseware/module/47498), which investigators can utilize and extend. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： open-source model Simulink Parabolic trough solar field open-loop response PI control

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SMOOTH-PURSUIT INITIATION IN THE PRESENCE OF A TEXTURED BACKGROUND IN MONKEY

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VISION RESEARCH 1986年第6期26卷 943-955页

作者： KELLER, EL KHAN, NS RUHR UNIV BOCHUM LEHRSTUHL PHYSIOL 2 D-4630 BOCHUM 1 GERMANY DEPT ELECT ENGN & COMP SCI BERKELEY SAN FRANCISCO CA 94115 USA

Smooth pursuit eye movements in the monkey were studied by measuring the average eye acceleration in the first 100 msec of the ocular response to suddenly moving constant velocity discrete visual targets. The tracking target''s motion was initiated on or eccentric to the fovea against a very dimly lit homogeneous background or an illuminated, highly textured, large-field background. The effect of the textured background was always to reduce the initial eye acceleration as compared to that present in the homogeneous background case. Movement of the background in the opposite direction to target spot movement also reduced the initial eye acceleration. In contrast, steady-state tracking measured several hundred msec after the onset of pursuit under the same conditions was only marginally reduced by the presence of the textured background.

关键词： Smooth pursuit Textured backgrounds Pursuit initiation open-loop response Motion detection Eye movements Monkey Macaque

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Ventilatory stability to transient CO2 disturbances in hyperoxia and normoxia in awake humans

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JOURNAL OF APPLIED PHYSIOLOGY 1997年第2期83卷 466-476页

作者： Lai, J Bruce, EN UNIV KENTUCKY CTR BIOMED ENGNWENNER GREN LABLEXINGTONKY 40506

Modarreszadeh and Bruce (J. Appl. Physiol. 76: 2765-2775, 1994) proposed that continuous random disturbances in arterial Pco(2) are more likely to elicit ventilatory oscillation patterns that mimic periodic breathing in normoxia than in hyperoxia. To test this hypothesis experimentally, in nine awake humans we applied pseudorandom binary inspired CO2 fraction stimulation in normoxia and hyperoxia to derive the closed-loop and open-loop ventilatory responses to a brief CO2 disturbance in terms of impulse responses and transfer functions. The closed-loop impulse response has a significantly higher peak value [0.143 +/- 0.071 vs. 0.079 +/- 0.034 (SD) ***(-1).0.01 l CO2-1, P = 0.014] and a significantly shorter 50% response duration (42.7 +/- 13.3 vs. 72.3 +/- 27.6 s, P = 0.020) in normoxia than in hyperoxia. Therefore, the ventilatory responses to transient CO2 disturbances are less damped (but generally not oscillatory) in normoxia than in hyperoxia. For the closed-loop transfer function, the gain in normoxia increased significantly (P < 0.0005), while phase delay decreased significantly (P < 0.0005). The gain increased by 108.5, 186.0, and 240.6%, while phase delay decreased by 26.0, 18.1, and 17.3%, at 0.01, 0.03, and 0.05 Hz, respectively. Changes in the same direction were found for the open-loop system. Generally, an oscillatory ventilatory response to a small transient CO2 disturbance is unlikely during wakefulness. However, changes in parameters that lead to additional increases in chemoreflex loop gain are more likely to initiate oscillations in normoxia than in hyperoxia.

关键词： periodic breathing central chemoreflex peripheral chemoreflex closed-loop response open-loop response impulse response transfer function pseudorandom binary sequence

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Can I reach that? Blind reaching as an accurate measure of estimated reachable distance

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CONSCIOUSNESS AND COGNITION 2018年 64卷 121-134页

作者： Weast, Rebecca A. T. Proffitt, Dennis R. Univ Virginia Charlottesville VA 22904 USA

Judgments of one's reach extent have been repeatedly found to be overestimated by about 10%. In 3 studies, a new dependent measure was employed in which participants viewed targets, closed their eyes, and then touched the location of the remembered target or pointed to its location if out of reach. This experimental paradigm yielded a much smaller but still present bias to over-estimate by about 2%. In addition, participants often reached for and touched target locations that were actually out of reach in a manner indicative of the typical 10% over-estimation bias. Surprisingly, participant response accuracy improved significantly and consistently across experimental trials even without visual or tactile feedback. This suggests that the proprioceptive information about the arm in space coupled with the remembered visual information about target location were sufficient to facilitate learning.

关键词： Perception Action Reaching Reachability open-loop response Action boundary

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