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International Smart Grid Workshop and Certificate Program (ISGWCP)

作者： Boussaid Ibrahim Harrouz Abdelkader Merahi Farid Ibrahim Yaichi Ilhami Colak Korhan Kayisli Virgil Dumbrava Electrical Engineering Department Laboratory of sustainable development and computer science (LDDI) University of Adrar Adrar Algeria Laboratory of sustainable development and computer science (LDDI) University of Adrar Adrar Algeria Electrical Engineering Department Automatic Laboratory of Setif University of Ferhat Abbas Setif1 Setif Algeria Department of Electrical Electronics Eng. Faculty of Engineering Architecture Nisantasi University Istanbul Turkey Department of Electric Power Systems Polytechnic University of Bucharest Bucharest Romania

This article presents a novel method for controlling a doubly fed induction generator (DFIG) wind energy system in the presence of variable wind speeds. In order to achieve decoupling control of the active and reactive power, the rotor-side converter (RSC) of the DFIG is controlled using field-oriented control (FOC). The system is very complicated and nonlinear, making it challenging to adjust the PI gains appropriately. The present research proposes the utilization of the Grey Wolf Optimization (GWO) algorithm as an approach to optimize the gains of a Proportional-Integral (PI) regulator. The simulation results demonstrate that the GWO-PI provides a lower criterion value and an improved response than the conventional PI.

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Time-Delay Feedback Control of a Suspended Cable Driven by Subharmonic and Superharmonic Resonance

SSRN

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SSRN 2024年

作者： Peng, Jian Li, Yanan Li, Luxin Lenci, Stefano School of Civil Engineering Hunan University of Science and Technology Hunan Xiangtan411201 China Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control Hunan University of Science and Technology Hunan Xiangtan411201 China School of Civil Engineering and Communication North China University of Water Resources and Electric Power Zhengzhou450045 China Department of Civil and Building Engineering and Architecture Polytechnic University of Marche Ancona60131 Italy

The longitudinal time-delay feedback control strategy is adopted to suppress the subharmonic and superharmonic responses of the suspended cable. Based on the Hamilton variational principle and the longitudinal time-delay feedback strategy, the in-plane nonlinear differential equations for a suspended cable are formulated, and Galerkin method is utilized to transform the equations into delayed differential equations. By using the method of multiple scales, approximate solutions for the 1/2-subharmonic and second-order superharmonic resonance responses of the controlled suspended cable were derived. The effects of the time delay and control gain are obtained through numerical examples. The research results demonstrate that by adjusting the control gain and time delay, resonance regions can be avoided, effectively suppressing the large-amplitude vibrations of the suspended cable and achieving favorable control performance. © 2024, The Authors. All rights reserved.

关键词： Time delay

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Estimation of the probability of cracking of facade coatings

Estimation of the probability of cracking of facade coatings

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International Conference on Intelligent Manufacturing and Materials, IMM 2021

作者： Loganina, Valentina Fediuk, Roman Taranov, Daniil Amran, Y.H. Mugahed Department of Quality Management and Construction Technologies Penza State University of Architecture and Construction 28 Titov Street Penza440028 Russia Polytechnic Institute Far Eastern Federal University 10 Ajax Bay Russky Island Vladivostok690922 Russia Department of Civil Engineering College of Engineering Prince Sattam Bin Abdulaziz University Alkharj11942 Saudi Arabia Department of Civil Engineering Faculty of Engineering and IT Amran University Amran9677 Yemen

ISBN: (纸本)9783035718348

Information on the stress state of protective and decorative coatings during the curing process, in particular on the cohesive state of destruction, is given. The influence of the type of substrate on the change in internal stresses in the coating is considered. It was revealed that the greatest value of shear stresses is observed in coatings on a heavyweight concrete substrate. The subsequent increase in temperature after curing to 50°C leads to an increase in the value of the normal stresses. The probability of cracking of coatings during thermal aging is estimated. It was revealed that during aging there is an exponential decrease in the cohesive strength of coatings and an increase in internal stresses. Aging tends to increase the likelihood of cracking of coatings. The change in stresses in coatings as a result of seasonal fluctuations in air temperature is considered. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Curing

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Correction: Essential dynamic characterization of a historical bridge: integrated experimental and numerical investigations

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Journal of Civil Structural Health Monitoring 2024年第8期14卷 1935-1935页

作者： Mansour, Sulyman Rizzo, Fabio Giannoccaro, Nicola Ivan La Scala, Armando Sabbà, Maria Francesca Foti, Dora Department of Architecture Construction and Design Polytechnic University of Bari Bari Italy Department of Engineering for Innovation University of Salento Lecce Italy

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Hidden mechanical oscillatory state in a carbon nanotube revealed by noise

arXiv

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arXiv 2023年

作者： Belardinelli, P. Yang, W. Bachtold, A. Dykman, M.I. Alijani, F. Department of Construction Civil Engineering and Architecture Polytechnic University of Marche Ancona Italy ICFO - Institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology Castelldefels Barcelona08860 Spain Department of Physics and Astronomy Michigan State University East LansingMI48824 United States Department of Precision and Microsystems Engineering Delft University of Technology Mekelweg 2 Delft2628CD Netherlands

Carbon nanotubes are devices of choice for investigating the interplay between electronic transport and nanomechanical motion. In this work, we report the co-existence of thermal vibrations and large-amplitude self-sustained oscillations in a carbon nanotube that originates from electron tunneling and thermal effects. The measured transitions between the two states are described by a Poisson process, revealing that the interstate switching is induced by noise. We observe the coexistence of the stable low-amplitude thermal state and the stable large-amplitude state (limit cycle) over a finite parameter range, which points to an isola bifurcation. We propose a minimalistic model based on nonlinear friction to account for the isola. Our work provides evidence for a new type of bifurcation leading to self-sustained oscillations that largely differs from the classical Hopf bifurcation, since these large-amplitude oscillations are a hidden state that can be unveiled via stochastic switching. We envision that this new dynamical regime and the means to reveal it will be of interest for various mesoscopic vibrational systems. Copyright © 2023, The Authors. All rights reserved.

关键词： Carbon nanotubes

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A Holistic methodology for lifecycle energy consumption of heritage buildings 1

A Holistic methodology for lifecycle energy consumption of h...

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1st International Conference on Fundamental, Applied Sciences and Technology, ICoFAST 2021

作者： Al-Sakkaf, A. Abdelkader, E.M. El-Zahab, S. Bagchi, A. Zayed, T. Dept. of Architecture and Environmental Planning College of Engineering and Petroleum Hadhramout University Mukalla Yemen Dept. of Building Civil and Environmental Engineering Concordia University Montreal Canada Structural Engineering Department Faculty of Engineering Cairo University Egypt Dept. of Engineering Management University of Balamand Kalhat El Koura Lebanon Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong

Heritage buildings are historically exceptional in their landscape and specific attention must be paid to their architectural element and components. Recently, the techniques that are utilized for the study and protection of cultural heritage have been on the rise in the research field. Studies have shown that project life cycle phases can be implemented to determine the performance of a given building in general. However, heritage buildings and their need were not considered. The project life cycle phases include: 1) planning, 2) manufacturing, 3) transportation, 4) construction, 5) operation and 6) maintenance phases. In addition, there is a need for an encompassing rating system that is capable of determining the most optimal pathway for rehabilitating heritage buildings. Hence, this article aims to present a comprehensive life cycle energy analysis model that optimizes expenditure over all building components by optimizing the budget. Furthermore, as a proof of concept, two case studies are applied in this research-GN in Canada and MP in the KSA. © Published under licence by IOP Publishing Ltd.

关键词： Energy utilization

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Beach morphodynamic characteristics and classifications on the straight coastal sectors in the west Guangdong

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Journal of Geographical Sciences 2020年第7期30卷 1179-1194页

作者： DING Yuanting YU Jitao CHENG Huangxin School of Environmental Studies China University of GeosciencesWuhan 430074China School of Surveying and Land Information Engineering Henan Polytechnic UniversityJiaozuo 454000HenanChina Department of Landscape Architecture China University of GeosciencesWuhan 430074China

Currently beach morphodynamic classification is the most important foundation to conduct associated coastal geomorphological *** paper carried out beach morphodynamic classifications for 12 straight beaches on headland-bay coasts based on field survey and evaluated the applicability of the most widely used dimensional fall velocity parameter(Ω)and relative tidal range parameter(RTR).One reflective,five intermediate and six non-barred dissipative beaches were visually classified and sand size seemed to be a key factor to differentiate these *** studied beaches were in relatively low wave energy environments(Hs<1 m)and the absolute deep-water wave energy level of P0=3 KWm-1 was supposed to a critical threshold to characterize the applicability of theΩand RTR *** two morphodynamic parameters were applicable for the beaches with P0>3 KWm-1 and MSR<2 *** was found that the model of the traditional winter-and-summer profiles was not applicable in the study area in despite of distinct wave *** studied beaches were more possible to hover around a limited range due to relatively low background wave environments and variability without considering typhoon impacts,which needs further research on actual breaker wave conditions and beach morphodynamic type responses to typhoon events.

关键词： beach morphodynamic type dimensionless fall velocity relative tidal range wave power level straight beaches

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STGCN-LSTM FOR OLYMPIC MEDAL PREDICTION: DYNAMIC POWER MODELING AND CAUSAL POLICY OPTIMIZATION

arXiv

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arXiv 2025年

作者： Wang, Yiquan Wang, Jiaying Huang, Tin-Yeh Yang, Jingyi Xu, Zihao College of Mathematics and System Science Xinjiang University Xinjiang Urumqi830046 China Shenzhen X-Institute Shenzhen518055 China College of Architecture and Environment Sichuan University Chengdu610065 China Department of Industrial and Systems Engineering Faculty of Engineering The Hong Kong Polytechnic University Hong Kong SAR 999077 China School of Design and Art Hunan Institute of Engineering Xiangtan411104 China Faculty of Science and Engeerning The University of Nottingham-Ningbo Ningbo315100 China

This paper proposes a novel hybrid model, STGCN-LSTM, to forecast Olympic medal distributions by integrating the spatio-temporal relationships among countries and the long-term dependencies of national performance. The Spatial-Temporal Graph Convolution Network (STGCN) captures geographic and interactive factors-such as coaching exchange and socio-economic links-while the Long Short-Term Memory (LSTM) module models historical trends in medal counts, economic data, and demographics. To address zero-inflated outputs (i.e., the disparity between countries that consistently yield wins and those never having won medals), a Zero-Inflated Compound Poisson (ZICP) framework is incorporated to separate random zeros from structural zeros, providing a clearer view of potential breakthrough performances. Validation includes historical backtracking, policy shock simulations, and causal inference checks, confirming the robustness of the proposed method. Results shed light on the influence of coaching mobility, event specialization, and strategic investment on medal forecasts, offering a data-driven foundation for optimizing sports policies and resource allocation in diverse Olympic contexts. © 2025, CC BY-NC-SA.

关键词： Resource allocation

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Wind tower based on unexploited industrial chimneys of St. Petersburg 2

Wind tower based on unexploited industrial chimneys of St. P...

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2nd International Scientific Conference on BuildInTech BIT 2021. Innovations and Technologies in Construction, BUILDINTECH BIT 2021

作者： Krasnozhen, S.E. Cherenkov, V.S. Ivanova, V.A. Elistratov, V.V. Higher School of Hydraulic and Power Engineering Construction Civil Engineering Institute Peter the Great St. Petersburg Polytechnic University St. Polytechnicheskaya 29 St. Petersburg194064 Russia Department of Industrial and Civil Construction Institute of Construction and Architecture Moscow State University of Civil Engineering Yaroslavskoye Shosse 26 Moscow129337 Russia

Due to the expansion of St. Petersburg from the beginning of the 20th century, the city has formed a Gray Belt of unexploited factories, some of which are architectural heritage. The modern solution to the problem of the Gray Belt is the creation of lofts and public spaces from them, however, it is also practiced transforming former factories into a site for generating "green energy". Because of the finiteness of the extracted minerals, the use of renewable resources is the most favourable way of producing electricity. The purpose of this work is to consider the possibility of using an industrial pipe to generate energy on the example: one of the highest unexploited pipes in Grey Belt - a steamshop's chimney (100m), built-in 1955. The result of the study is to determine the inexpediency of using the principle of a wind tube in chimneys in the Gray belt in ***, because, based on the calculations, according to the developed method, the height required for the wind turbine to start moving is 154 m in the summertime in St. Petersburg. During the consideration of the highest pipe in the Leningrad Region (320m), there was concluded that it can provide electricity for 31 people. © Published under licence by IOP Publishing Ltd.

关键词： Chimneys

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To compute or not to compute?

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Journal of Traffic and Transportation engineering(English Edition) 2019年第1期6卷 85-93页

作者： Alessandra Fiore Ivo Vanzi Camillo Nuti Cristoforo Demartino Rita Greco Bruno Briseghella Department of Engineering and Geology University of Chieti-Pescara "G.d'Annunzio" DICAR Department of Civil Engineering and Architecture Polytechnic University of Bari College of Civil Engineering Fuzhou University Department of Architecture Roma Tre University College of Civil Engineering Nanjing Tech University DICATECH Department of Civil Engineering Environment Territory Building and Chemical Polytechnic University of Bari

In a previous paper "to retrofit or not to retrofit?"(Nuti and Vanzi, 2003) a straightforward procedure able to forecast the economic return of seismic structural upgrading was presented. More recently, the authors realized that the final mathematical results can be much simplified so as to allow back-of-an-envelope computation. The title of this paper tries to highlight precisely this aspect, namely that for many a regular seismic structural upgrading cases, nearly no computation is needed(apart from one subtraction and one multiplication) to assess their economic convenience. These findings are presented and discussed in this paper, together with a state of the art on the cost-studies available in literature and technical codes. The mathematical formulation leading to the proposed approximation is suitably explained, underlining its applicability field and comparing it with the rigorous solution. Also a table and a formula are furnished that alternatively allows to calculate the maximum estimation errors, in order to obtain an upper and lower bound for the maximum amount of money which should be allocated for seismic structural upgrading.

关键词： Seismic retrofitting Structural reliability Safety Optimization Cost minimization

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