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Probabilistic fatigue life prediction for ship structures using fracture mechanics

NAVAL ENGINEERS JOURNAL 2000年第5期112卷 88-88页

作者： Gifford, LN [?]1Gilberto F. M. de Souza is an assistant professor at the department of Mechanical Engineering at the University of S?o Paulo Brazil. He completed his B.S. and M.S. degrees in naval architecture and marine engineering in 1985 and 1990 respectively at the University of Sao Paulo and completed his Ph.D. degree in mechanical engineering in 1994 at the University of S?o Paulo. He is also a visiting scholar in the Center of Technology and System Management at the University of Maryland at College Park. He is conducting research with professor Bilal M. Ayyub in the area of development of fatigue fracture reliability-based design of ship structures. He has authored or co-authored several papers and reports. He has taken part in research developed for the Brazilian Navy and Petrobras—Brazilian Petroleum Company in the area of structural analysis and design of marine structures.

The design of steel structures against fatigue requires the consideration of fatigue damage accumulation in the form of fatigue crack growth analysis and prediction. Fatigue is an important criterion to evaluate the adequacy of ship structural details, and the methods for prediction of fatigue life taking into account the crack growth are becoming of great interest This paper provides a methodology for ship structure fatigue analysis based on probabilistic linear elastic fracture mechanics. Probabilistic analysis requires the use of reliability methods for assessing fatigue life by considering the crack propagation process and the uncertainties associated with it The limit state function that governs fatigue crack growth is developed based on Paris law by considering as random variables the coefficient of the curve that describes the rate of change of crack size due to loading cycles and its relationship to stress level and initial crack size and the stresses induced by external loading. As an improvement to the traditional fatigue fracture probabilistic approach, this paper presents a methodology for probabilistic analysis of ship structure fatigue failure considering the effects of the residual stresses induced by hull fabrication process over the crack growth rate.

关键词： Shipbuilding

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Bibliographic Exploration of Application of Machine Learning and Artificial Intelligence in Solar Energy

Bibliographic Exploration of Application of Machine Learning...

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2024 International Conference on Science, Engineering and Business for Driving Sustainable Development Goals, SEB4SDG 2024

作者： Ajibade, Samuel-Soma M. Bashir, Faizah Mohammed Dodo, Yakubu Aminu Oyebode, Oluwadare Joshua Culpable, Rex V. De La Calzada, Limic M. Adediran, Anthonia Oluwatosin Ajibade, Temiloluwa Iyanuoluwa Sunway University Dept of Computing and Information Systems Selangor Malaysia Istanbul Ticaret Univ Dept of Comp. Engineering Turkey University of Hail Department of Decoration and Interior Design Hail55467 Saudi Arabia Najran University Architectural Engineering Department Najran66426 Saudi Arabia Afe Babalola University Civil and Environmental Engineering Ekiti State Ado-Ekiti Nigeria Cebu Technological University College of Technology Cebu Philippines Cebu Technological University College of Engineering Cebu Philippines Federal University of Uberlandia Faculty of Architecture and Urban Design Brazil Scholar School System Dept of Business Management Birmingham United Kingdom

ISBN: (纸本)9798350358155

Solar energy could mitigate global warming and climate change. Solar energy faces economic, environmental, and technical challenges. Machine learning solves these technical issues. Despite several studies, machine learning in photovoltaics and solar energy is understudied. This study examines publishing patterns and bibliometrics to critically evaluate machine learning applications in photovoltaics and solar energy research. Scopus uses PRISMA. International publishing, citations, and collaboration are high. The Chinese Ministry of Education employs famous scholars like G. E. Georghiou and Haibo Ma. China is most active due to funding schemes like the National Natural Science Foundation and the National Key Research and Development Programme. This study examines publication patterns by country, institution, and funding organisation from 2014 to 2022, spanning topic categories and indicators. Examining author-keyword data to group publishing themes and identify influential journals. Increasing understanding of machine learning applications in photovoltaics and solar energy research. This project will examine the potential for significant development and the hurdles that must be overcome to leverage Cognitive Computing's benefits in cancer and tumour research. In response to the rising amount of malware, phishing, and intrusion attacks on global energy and grid infrastructure, photovoltaic and solar energy system cybersecurity may be studied. © 2024 IEEE.

关键词： Malware

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A study on the intrinsic motivation program in the workshop - Trial and verification on the workshop for the welfare service worker

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AIJ Journal of Technology and design 2012年第38期18卷 381-386页

作者： Mizukami, Satoko Awahara, Tomoko Sakurai, Yasuhiro System Design Eng. Course Graduate School of Eng. Univ. of Fukui B. Liberal Arts Japan Faculty of Education and Regional Studies Univ. of Fukui Japan Architecture and Civil Eng. Course Graduate School of Eng. Univ. of Fukui Japan

For the increase of the civil consciousness and the ability to act as a citizen, it is important to develop the people's independence by an intrinsic motivation, where it is essential that each person satisfies three psychological desires of ability, autonomy, and relation. The workshop adopting the trial program developed those desires and resulted in the increase of motivation and the change of willingness and action. Verifying the methodology of the workshop has shown an effective way to enhance citizens' intrinsicness.

关键词： Citizen Independence Citizenship education Facilitation Intrinsic motivation Workshop methodology

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Analysis and Area Zoning on Nontraditional Water Resources Utilization Characteristics in China

Analysis and Area Zoning on Nontraditional Water Resources U...

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International Conference on Environmental Pollution and Public Health(EPPH 2012) Vol1

作者： Junling Wang Na Zhang Yajun Zhang Wei Han Xianguo Zhang Key Laboratory of Urban Stormwater System and Water Environment (Beijing University of Civil Engineering and Architecture) Ministry of Education Beijing Changping Water Supply Co.Ltd. Beijing Capital Co. Ltd. Planning and Design Institute of Forest Products Industry

This study analysized the characteristics of 31 provinces of China for utilization of nontraditional water resources, which is helpful to evaluate the potentials and development for using the nontraditional water resources. Then it used cluster analysis on the research for the features of nontraditional water resources utilization, based on the seven key factors that reflect the utilization of nontraditional water resources in various regions, and the result was shown that it is appropriate to divide the 31 provinces into seven clusters. The area zoning result can provide scientific support for making right policy associated with the use of nontraditional water resources in China.

关键词： Nontraditional water resources, cluster analysis, zoning

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designing navy hull forms for fuel economy

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NAVAL ENGINEERS JOURNAL 2004年第2期116卷 43-54页

作者： Karafiath, G McCallum, D Hendrix, D GABOR KARAFIATH is a group leader in the Resistance and Powering Department (Code 5200) at the Carderock Division of NSWC. He graduated from the University of Michigan where he earned a BSE in naval architecture and aerospace engineering in 1970 and an MS in naval architecture in 1972. He has been with David Taylor since leaving Michigan. He specializes in tank testing analysis and in high performance ship designs. He is responsible for all Navy ship model testing and initial design and has many years of experience both nationally and internationally. Mr. Karafiath has been a member of ASNE since 1985. DONALD MCCALLUM has worked as a naval architect for about 45 years in Scotland Canada and the U.S. He graduated from the University of Strathclyde Glasgow in 1959 and later obtained a masters in naval architechture from the University of Michigan. For 24 years he worked in the Hydrodynamics Group at NAVSEA producing hull form designs of combatants carriers trawlers oilers etc. His specialties are hull form design ship stabilization and stack design. Mr. McCallum has been the co-developer along with the British Ministry of Defense of the Hull Design Database System. Now retired he consults with the U.S. Navy on ship design. Mr. McCallum has been a member of ASNE since 1983. DR. DANE HENDRIX has been employed at the David Taylor Model Basin Carderock Division NSWC since 1984. He holds a BS degree in naval architecture and marine engineering from Webb Institute (1984) and an MS degree in mechanical engineering from Catholic University (1987). In 1995 he received his Ph.D. from the University of Maryland in mechanical engineering. His areas of interest are primarily in free-surface hydrodynamics and hull form design. Dr. Hendrix is a visitor at ASNE.

During initial bull form design, a multitude of requirements need to be met. Among these are mission, ship size, armament, communications, stability, speed, sea keeping, etc. Tools such as ASSET are used to arrive at a design solution that will satisfy all these requirements. However, at this early design stage, attention needs to be given to the bull form shape, and its impact upon fuel consumption. Rising fuel costs and the need to conserve energy have mandated that Navy designs become more "energy efficient." This paper documents a new design metric "C-PE" for evaluating the resistance of any bull design. A C-PE database is developed from historic model test data residing in the U.S. Navy Hull design Database system (HDDS). C-PE compares the resistance of a bull form to that of a similar Taylor Standard Series bull form. The paper also introduces a new bull form optimization computer program developed by Naval Surface Warfare Center (NSWC) and applies this program to show the potential for hull form improvement and fuel cost savings.

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TRIMARAN SHIPS - THE CONFIGURATION FOR THE FRIGATE OF THE FUTURE

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NAVAL ENGINEERS JOURNAL 1995年第3期107卷 77-93页

作者： ANDREWS, DJ ZHANG, JW David Andrews:is the Professor of Naval Architecture at University College London. He is a member of the Royal Corps of Naval Constructors and has spent his career in submarine and surface ship design and procurement projects. He graduated from UCL in 1970 and obtained his MSc in Naval Architecture in 1971. During his tour year appointment to UCL as Lecturer in Naval Architecture he obtained his PhD in Naval Architecture and Ocean Engineering for his thesis ‘Synthesis in Ship Design’ in 1984. From 1986 to 1990 he was the Warship Project Manager for the Royal Navy's Replacement Amphibious Programme (LPD and LPH) and for the Aviation Training Ship (RFA ARGUS) as well as the in-service Steam Powered Warships Group. Before returning to UCL in 1993 he was the Head of Preliminary Design in the Future Projects Directorate where he was responsible for studies into future submarines and surface ships including unconventional hull forms. At UCL he directs the naval architecture undergraduate and MSc courses whilst heading up the Naval Architecture Research Group's programmes in computer aided preliminary design trimaran research combat system integration and ship design methodology. He is a Chartered Engineer and Fellow of the Royal Institution of Naval Architects for whom he Chairs the Membership Committee and is a Member of Council and the Executive Committee

This paper follows on from two previous papers from UCL. The first describes a student ship design for an advanced technology frigate, configured with three hulls, whilst the second, given by the first author's predecessor at UCL and the second author at the RINA in 1994, described the reseach undertaken at University College London into the naval architecture of Trimaran Ships. The paper commences with a resume of the origins of the Trimaran concept, its first power boat example, the Ilan Voyager, and the Advanced Technology Frigate design which adapted the trimaran configuration to a modern warship requirement. The other UCL design studies, ranging from an offshore patrol vessel to a small aircraft carrier, are outlined. The various naval architectural considerations of powering, stability, structures and manoeuvring are then described. Particular attention is focused on the seakeeping analysis which is being undertaken jointly by UCL and DRA Haslar from the autumn of 1994 although the submission date for publication precludes inclusion of model and analytical results. Finally, on work in hand, preliminary results on a spatial analysis of the Trimaran configuration and the advantages this appears to provide in a more spacious upper deck and main deck arrangement in the central portion of the ship is outlined. The paper concludes by postulating that, in respect of the capabilities likely to be most significant in the requirements for frigate designs in the future, the Trimaran would appear to have distinct advantages over the monohull and other unconventioanl hull forms.

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Speaker's Emotions Recognition Module Based on the GoogleLeNet Neural Network

Speaker's Emotions Recognition Module Based on the GoogleLeN...

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2022 International Conference on Smart Information systems and Technologies, SIST 2022

作者： Tereikovskyi, Ihor Tereikovska, Liudmyla Kryvoruchko, Olena Tereikovskyi, Oleh Tyshchenko, Dmytro Franchuk, Tamara National Technical University Of Ukraine Igor Sikorsky Kyiv Polytechnic Institute Dept. Of System Programming And Specialized Computer Systems Kyiv Ukraine Kyiv National University Of Construction And Architecture Dept. Of Information Technology For Design And Applied Mathematics Kyiv Ukraine Kyiv National University Of Trade And Economics Dept. Of Software Engineering And Cyber Security Kyiv Ukraine National Technical University Of Ukraine Igor Sikorsky Kyiv Polytechnic Institute Dept. Of Department Of Computer Engineering Kyiv Ukraine

ISBN: (数字)9781665467902

ISBN: (纸本)9781665467902

The article is devoted to the development of means for recognition of the emotions of the speaker, based on the neural network analysis of fixed fragments of the voice signal. The possibility of improving recognition tools through the use of a convolutional neural network of the GoogLeNet type is shown. The expediency of training the network on the examples of the TESS database is determined. A procedure for representing a voice signal in the form of a square grayscale image has been developed. Based on the use of the specified database, the modification of the GoogLeNet network was carried out. The architecture and software implementation of the recognition module have been developed. With the help of computer experiments, it has been established that after 150 epochs of training on a fairly limited training sample, the modified GoogLeNet makes it possible to achieve an accuracy of recognition of the speaker's emotions of approximately 0.97 on test examples. The obtained accuracy is comparable to the accuracy of the best modern systems of this purpose and confirms the promise of using neural network models like GoogLeNet for emotion recognition based on voice signal analysis. The need for further research aimed at reducing the resource intensity of the neural network model is shown. © 2022 IEEE.

关键词： Emotion Recognition

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Effects of Organosilane-modified PCE on the Fluidity and Hydration Properties of Cement-Fly Ash Composite Binder

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Journal of Wuhan University of Technology(Materials Science) 2020年第6期35卷 1081-1089页

作者： HE Yan LIU Shuhua JI Tao KONG Yaning SHUI Liangliang School of Civil Engineering Suzhou University of Science and TechnologySuzhou 215011China State Key Laboratory of Green Building Materials China Building Materials AcademyBeijing 100024China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Water System Science for Sponge City Construction Wuhan UniversityWuhan 430072China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China School of Architecture and Engineering Nanjing Institute of TechnologyNanjing 211167China China West Construction Academy of Building Materials Chengdu 610000China Shanghai Municipal Engineering Design Institute(Group)Co.Ltd. Shanghai 200092China

Effects of organosilane-modified PCE (OS-PCE) on the fluidity and the hydration properties of cement-fly ash (FA) composite binder were systematically *** experimental results show that OS-PCE possesses respectively 36.98% and 36.67% higher saturated adsorption amount on cement and FA,in comparison with ordinary PCE,and can contribute to higher fluidity of cement-FA composite *** addition of OS-PCE retards hydration process of cement-FA composite binder proportionally with the dosage of OS-PCE,but promotes the hydration kinetics of the composite *** reactivity enhancement is attributed to the well-dispersed FA by OS-PCE,which provides more nucleation sites for the reaction of heterogeneous C-S-H and enhances the contact with water to react with CH forming pozzolanic ***-distributed hydration products are exhibited in the hardened binder added with OS-PCE,with a large number of hydrated gels uniformly fill in the pores and gaps,which improves the compaction of the hardened structure.

关键词： cement fly ash organosilane-modified PCE fluidity hydration properties

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MGSO: Monocular Real-time Photometric SLAM with Efficient 3D Gaussian Splatting

arXiv

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arXiv 2024年

作者： Hu, Yan Song Abboud, Nicolas Ali, Muhammad Qasim Yang, Adam Srebrnjak Elhajj, Imad Asmar, Daniel Chen, Yuhao Zelek, John S. Vision and Image Processing Lab The Faculty of System Design Engineering The University of Waterloo 200 University Avenue West WaterlooON Canada Vision and Robotics Lab Maroun Semaan Faculty of Engineering and Architecture American University of Beirut Riad El Solh Beirut1107 2020 Lebanon

Real-time SLAM with dense 3D mapping is computationally challenging, especially on resource-limited devices. The recent development of 3D Gaussian Splatting (3DGS) offers a promising approach for real-time dense 3D reconstruction. However, existing 3DGS-based SLAM systems struggle to balance hardware simplicity, speed, and map quality. Most systems excel in one or two of the aforementioned aspects but rarely achieve all. A key issue is the difficulty of initializing 3D Gaussians while concurrently conducting SLAM. To address these challenges, we present Monocular GSO (MGSO), a novel real-time SLAM system that integrates photometric SLAM with 3DGS. Photometric SLAM provides dense structured point clouds for 3DGS initialization, accelerating optimization and producing more efficient maps with fewer Gaussians. As a result, experiments show that our system generates reconstructions with a balance of quality, memory efficiency, and speed that outperforms the state-of-the-art. Furthermore, our system achieves all results using RGB inputs. We evaluate the Replica, TUM-RGBD, and EuRoC datasets against current live dense reconstruction systems. Not only do we surpass contemporary systems, but experiments also show that we maintain our performance on laptop hardware, making it a practical solution for robotics, A/R, and other real-time applications. © 2024, CC BY-NC-SA.

关键词： SLAM robotics

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A Logic Cell design and routing Methodology Specific to VNWFET

A Logic Cell Design and routing Methodology Specific to VNWF...

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Annual IEEE Northeast Workshop on Circuits and systems (NEWCAS)

作者： Arnaud Poittevin Ian O’ Connor Cé dric Marchand Alberto Bosio Cristell Maneux Chhandak Mukherjee Guilhem Larrieu Abhishek Kumar Heterogeneous System Design Lyon Institute of Nanotechnology (INL) Lyon France Institut de l&#x2019 int&#x00E9 gration du Mat&#x00E9 riau au Syst&#x00E8 me (IMS) Bordeaux France Laboratoire d&#x2019 Analyse et d&#x2019 Architecture des Syst&#x00E8 mes (LAAS) Toulouse France

ISBN: (数字)9781665401050

ISBN: (纸本)9781665401067

New emerging Vertical NanoWire Field-Effect Transistors (VNWFET) appear promising for compact energy efficient computing architectures, still, we notice a lack of technology aware and coherent design methodologies. Such tools would enable a thorough exploration of the benefits of these new technologies at the circuit level. This paper explores a complete methodology for designing a logic cell library using VNWFET. The methodology includes low-level logic cells Technology Computer Aided design (TCAD) simulations, Parasitic Extraction (PEX) of predictive devices and 3D physical design rules and cell *** this design method, we focus on the standard CMOS logic cells, with up to 12 transistors and detail the inter-transistor routing. The various cells generated using this method are tested using TCAD and selected based on their PEX results. The whole process is performed on logic cell examples and in the light of the current design context, results show an improvement in footprint area optimization.

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