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A novel trajectory-based online controller design approach to fault accommodation in NREL’s 5MW wind turbine systems

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Control theory and Technology 2014年第2期12卷 122-131页

作者： Tushar JAIN Joseph J.YAME Dominique SAUTER Aalto University School of Chemical Technology P. O. Box 16100 F1-00076 Aalto Finland Centre de Recherche en Automatique de Nancy Universite de Lorraine 54506 Vandoeuvre-les-Nancy France

This paper presents a real-time mechanism to tolerate faults occurring in a wind turbine （WT） system. This system is composed of a FAST coded simulator designed by the U.S. National Renewable Energy Laboratory. The demonstrated mechanism lies under the taxonomy of active fault-tolerant control （FTC） systems, namely online redesign based approach. In the proposed approach, we do not use any a priori information about the model of the turbine in real-time. In fact, we use online measurements generated by the WT. Based on the given control specifications, and the observed measurement an occurred fault is accommodated by reconfiguring the online controller such that the WT generates rated power even under faulty conditions. Second, no explicit fault diagnosis （FD） module is used in this approach. As a result, issues of model uncertainty, false alarms, etc. associated with an integrated FD and controller reconfiguration approach to FTC systems are not experienced here.

关键词： Fault-tolerant control behavioral theory Wind turbines Online controller redesign

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A New Fault Detection Method From Data-Based Dissipativity theory

A New Fault Detection Method From Data-Based Dissipativity T...

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第40届中国控制会议

作者： Wangyan Li Jie Bao Guoliang Wei College of Science University of Shanghai for Science and Technology School of Chemical Engineering The University of New South Wales (UNSW Sydney)

In this paper,a novel fault detection scheme for linear process systems using data-based dissipativity theory is *** data-based dissipativity is learned from the available input/output *** of a process is an input/output property,which may not be valid when a fault *** light of this fact,in the proposed approach,the dissipativity of a process is tailored such that it is fault-sensitive,i.e.,no longer valid when faults *** adopting the storage functions and supply rates in the quadratic difference form,the dissipativity conditions are represented as quadratic functions of the input/output trajectories of the process,which captures much more detailed dynamical features compared to traditional *** dissipativity properties are determined offline by solving an optimization problem with linear matrix inequality *** online diagnosis algorithm involves checking of inequalities on input/output trajectories only,which makes the design much *** proposed approach is illustrated using a case study of fault detection of a heat exchanger.

关键词： Index Terms—Data-based fault detection dissipativity quadratic difference form behavioral theory

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The Influence of Emotions and behavioral Theories behind Hand Hygiene in COVID-19 Pandemic

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Open Journal of Preventive Medicine 2021年第7期11卷 299-307页

作者： Sheng Chuu Anne Kiew Jia Lin Jacklyn Yek Prit Anand Singh Rajkumar Chandran Department of Anesthesiology and Intensive Care Unit Changi General Hospital Singapore

Background: Hand hygiene (HH) is essential in preventing healthcare-associated infections, especially during the COVID-19 pandemic, where SARS-CoV2 has shown the ability to survive on surfaces for days. In this study, we explore HH compliance rate and the factors associated with its increase during COVID-19 pandemic. Methods: HH compliance was assessed amongst doctors in Anesthesia and Surgical Intensive Care Unit by direct observation between 2018 and 2021. An anonymous survey was then sent to the doctors to understand factors influencing the observed improvement in HH compliance during the pandemic. Results: Compliance towards the five moments of HH has shown a statistically significant rising trend from a median HH compliance of 60% in 2018, to 70% in 2019 to 94% in 2020. However, HH compliance subsequently declined in the first quarter of 2021 to median of 87%. The follow-up survey had a response rate of 96% (n = 53). 90% of survey participants responded that their HH frequency had increased during the COVID-19 pandemic with 47% stating they were performing HH 11 - 20 times/day. 64% responded that this increased frequency had affected their skin condition. 62% responded that this increased frequency was sustainable even after the pandemic ends. Participants ranked considerations influencing HH compliance. “Prevent transmitting the infection to vulnerable patients” was ranked highest followed by “High infection rate”, “Fear of contracting COVID-19” and lastly, “Public health guidelines”. Conclusions: Despite the absence of new campaigns, HH compliance reached an all-time high. The pandemic has provided opportunity for behavioral change through “reflective” drivers of behavior such as emotions (“Fear”) and knowledge (“High infection rate”). Understanding the motivations behind current increased HH compliance and riding on the increased initial uptake of behavior may help convert HH into a habitual

关键词： Pandemics Hand Hygiene Infection Control Healthcare Associated Infection Fear Compliance behavioral theory

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