Relevant bibliographies by topics / FTA diagram

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'FTA diagram'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "FTA diagram"

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Jiang, Wei, and Wei Han. "Analysis of “2·28” KEEPER Chemical Industries Hazardous Chemical Explosion Accident Based on FTA and HFACS." International Journal of Environmental Research and Public Health 15, no. 10 (September 30, 2018): 2151. http://dx.doi.org/10.3390/ijerph15102151.

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On 28 February 2012, a guanidine nitrate explosion occurred at HEBEI KEEPER Chemical Industries Co., Ltd., China, resulting in 25 deaths, with 4 missing individuals and 46 injured. In order to explore the causal relationship hidden behind this accident, fault tree analysis (FTA) and the Human Factors Analysis and Classification System (HFACS) were used to systematically analyze the incident. Firstly, FTA was used to analyze the causes of the accident in depth, until all the basic causal events causing the guanidine nitrate explosion were identified, and a fault tree diagram of the guanidine nitrate explosion was drawn. Secondly, for the unsafe acts in the basic causal events, the HFACS model was used to analyze the three levels of factors that lead to unsafe acts, including the preconditions for unsafe acts, unsafe supervision, and organizational influences. Finally, based on the analysis results of FTA and HFACS, a complete logic diagram of the causes of the accident was obtained. The FTA and HFACS accident analysis methods allowed for the identification of human factors and the accident evolution process in the explosion accident and provide a reference for accident investigation.
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Libošvárová, Adriána, and Peter Schreiber. "Optimization of Technical System by Using FTA and Genetic Algorithm." Applied Mechanics and Materials 693 (December 2014): 135–40. http://dx.doi.org/10.4028/www.scientific.net/amm.693.135.

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The main aim of the paper lies in providing a proposal of technical system optimization in terms of maximizing its reliability when a certain sum of maintenance costs is given, or minimizing maintenance costs to achieve the defined reliability. The technical system is analyzed using the method called fault tree analysis (FTA) and the final diagram is represented by a tree structure. At the top of the diagram, there is an undesired event which represents the system failure. This top event is analyzed and branched into several other events in order to obtain all possible faults of system elements and their combinations which lead to the system failure. Each primary event contains basic information as minimal and maximal reliability and the corresponding maintenance costs. As a result, it is possible to calculate the total probability of system failure, respectively to its reliability, and the total costs needed to ensure the required system reliability. Genetic algorithms are used and applied in the diagram created by FTA. The paper contains the whole proposal of using a genetic algorithm in order to optimize costs and system reliability on the basis of defined conditions. The described proposal is implemented within a functional application and then tested using real data. The results form an integral part of this paper.
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Fei, Shuai, Xiangdong Li, and Yali Fan. "Safety evaluation for bridge crane based on FTA and AHP." MATEC Web of Conferences 207 (2018): 03014. http://dx.doi.org/10.1051/matecconf/201820703014.

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Starting from the development status of the lifting machinery industry, this paper analyzes the data about safety accidents of bridge cranes, and identifies the assessment indicators affecting the safety performance of bridge cranes based on fault tree analysis (FTA), including fatigue factors, human factors, environmental factors, and management factors. Then, the weights of safety evaluation indicators are determined based on analytic hierarchy process (AHP). Finally, the safety evaluation system is established and demonstrated with use case diagram and role flow chart.
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Fazlollahtabar, Hamed, and Seyed Taghi Akhavan Niaki. "Integration of fault tree analysis, reliability block diagram and hazard decision tree for industrial robot reliability evaluation." Industrial Robot: An International Journal 44, no. 6 (October 16, 2017): 754–64. http://dx.doi.org/10.1108/ir-06-2017-0103.

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Purpose This paper aims to conduct a comprehensive fault tree analysis (FTA) on the critical components of industrial robots. This analysis is integrated with the reliability block diagram (RBD) approach to investigate the robot system reliability. Design/methodology/approach For practical implementation, a particular autonomous guided vehicle (AGV) system was first modeled. Then, FTA was adopted to model the causes of failures, enabling the probability of success to be determined. In addition, RBD was used to simplify the complex system of the AGV for reliability evaluation purpose. Findings Hazard decision tree (HDT) was configured to compute the hazards of each component and the whole AGV robot system. Through this research, a promising technical approach was established, allowing decision-makers to identify the critical components of AGVs along with their crucial hazard phases at the design stage. Originality/value As complex systems have become global and essential in today’s society, their reliable design and determination of their availability have turned into very important tasks for managers and engineers. Industrial robots are examples of these complex systems that are being increasingly used for intelligent transportation, production and distribution of materials in warehouses and automated production lines.
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Ye, Shi Feng, Dong Xiang Chen, Tai Yong Wang, and Dan Wang. "Petri Nets in the Emu Pantograph Application of Fault Tree Analysis (FTA)." Key Engineering Materials 693 (May 2016): 1385–90. http://dx.doi.org/10.4028/www.scientific.net/kem.693.1385.

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This paper presents the fault mode and barb causality diagram of the pantograph of the emu, by settling and counting fault information of the pantograph. And fault analysis of the pantograph is used to establish the fault tree. The Petri net model of the pantograph is simplified on the base of the principle of duality and resorption by combining the modeling theory of Petri net and the fault tree. The minimum cut set is obtained by solving the above simplified model with incidence matrix. Compared to common solution of the fault tree, this integrated model efficiently simplifies computation of complicated fault tree. The method raised here saves the time of computation which increases the efficiency of analysis, and improves the accuracy of fault diagnosis.
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Fazlollahtabar, Hamed, and Seyed Taghi Akhavan Niaki. "Fault Tree Analysis for Reliability Evaluation of an Advanced Complex Manufacturing System." Journal of Advanced Manufacturing Systems 17, no. 01 (March 2018): 107–18. http://dx.doi.org/10.1142/s0219686718500075.

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In this paper, minimal paths and cuts technique is developed to handle fault tree analysis (FTA) on the critical components of industrial robots. This analysis is integrated with the reliability block diagram (RBD) approach in order to investigate the robot system reliability. The model is implemented in a complex advanced manufacturing system having autonomous guided vehicles (AGVs) as material handling devices. FTA grants cause and effects and hierarchical properties to the model. On the other hand, RBD simplifies the complex system of the AGVs for reliability evaluation. The results show that due to the filtering of the paths in a manufacturing system for AGVs, the reliability is highly dependent on the mostly occupied paths by AGVs. The failure probability for the AGV is considered to follow the exponential probability distribution and thus the whole system reliability using minimal paths and cuts method is obtained 0.8741.
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Antonov, A. V., E. Yu Galivets, V. A. Chepurko, and A. N. Cherniaev. "Fault tree analysis in the R programming environment. Treatmentof common cause failures." Dependability 18, no. 3 (September 5, 2018): 3–9. http://dx.doi.org/10.21683/1729-2646-2018-18-3-3-9.

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Aim. This paper is the continuation of [1] that proposes using the R programming language for fault tree analysis (FTA). In [1], three examples are examined: fault tree (FT) calculation per known probabilities, dynamic FT calculation per known distributions of times to failure for a system’selements. In the latter example, FTA is performed for systems with elements that are described by different functional and service models. Fault tree analysis (FTA) is one of the primary methods of dependability analysis of complex technical systems. This process often utilizes commercial software tools like Saphire, Risk Spectrum, PTC Windchill Quality, Arbitr, etc. Practically each software tool allows calculating the dependability of complex systems subject to possible common cause failures (CCF). CCF are the associated failures of a group of several elements that occur simultaneously or within a short time interval (i.e. almost simultaneously) due to one common cause (e.g. a sudden change in the climatic service conditions, flooding of the premises, etc.). An associated failure is a multiple failure of several system elements, of which the probability cannot be expressed simply as the product of the probabilities of unconditional failures of individual elements. There are several generally accepted models used in CCF probability calculation: the Greek letters model, the alpha, beta factor models, as well as their variations. The beta factor model is the most simple in terms of associated failures simulation and further dependability calculation. The other models involve combinatorial search associated events in a group of n events, that becomes labor-consuming if the number n is large. Therefore, in the above software tools there are some restrictions on the n, beyond which the probability of CCF is calculated approximately. In the current R FaultTree package version there are no above CCF models, therefore all associated failures have to be simulated manually, which is not complicated if the number of associated events is small, as well as useful in terms of understanding the various CCF models. In this paper, for the selected diagram a detailed analysis of the procedure of associated failures simulation is performed for alpha and beta factor models. The Purposeof this paper consists in the detailed analysis of the alpha and beta factor methods for a certain diagram, in the demonstration of fault tree creation procedure taking account of ССF using R’s FaultTree package. Methods. R’s FaultTree scripts were used for the calculations and FTA capabilities demonstration.Conclusions. Two examples are examined in detail. In the first example, for the selected block diagram that contains two groups of elements subject to associated failures, the alpha factor model is applied. In the second example, the beta factor model is applied. The deficiencies of the current version of FaultTree package are identified. Among the main drawbacks we should indicate the absence of some basic logical gates.
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Gong, Jian Chun, Deng Rong Zhou, Zong Biao Lu, and Zhong Fa Mao. "Based on the FTA of Electronic-Control Engine Start Fault Diagnosis Analysis." Applied Mechanics and Materials 303-306 (February 2013): 871–75. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.871.

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Based on the analysis and the induction of electronic control fuel injection engine common failure which can't start, and according to the engine’s working principle and failure mechanism, established the electronic control fuel injection engine’s fault tree, and having made qualitative analysis about the working reliability of the engine by using the fault tree analysis method. This paper offered the electronic control fuel injection engine’s failure form which can’t start in classification, discussed the process of establishing the fault tree at length, even built and mapped the engine’s fault tree which can’t start; According to the natural gas compressor’s fault tree diagram, and applying the descending method to get the fault’s minimal cut sets. By making qualitative analysis, finding out the main influence factors of failure, and putting forward quite perfect methods of removing fault, which providing electronic fuel injection engine maintenance with the beneficial reference.
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Syahabuddin, Agus, and Marjuki Zulziar. "Analisis Defect Produk Viro Core Collection dengan Metode Fault Tree Analysis, Analisis Faktor dan Perbandingan." Jurnal INTECH Teknik Industri Universitas Serang Raya 7, no. 1 (April 19, 2021): 23–29. http://dx.doi.org/10.30656/intech.v7i1.2695.

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PT. Polymindo Permata adalah perusahaan ekstrusi plastik yang memproduksi rotan sintetis. Salah satu produk fast moving andalannya adalah Viro Core Collection (VCC) yang menyumbang 50% dari total order. Defect produk VCC masih jauh lebih tinggi dari target 3%. Tujuan penelitian ini adalah untuk meningkatkan kualitas dan mengurangi waste dengan pendekatan sistematis menggunakan metode Fault Tree Analysis (FTA), analisis faktor dan analisis perbandingan. Hasil diagram Pareto menunjukan penyebab cacat tertinggi adalah warna belang mencapai 23.24 % dari total produk cacat. Hasil analisis FTA dan analisis faktor diketahui faktor penyebab defect warna belang disebabkan karena metode mixing material untuk mesin Co-extruder setiap Setter yang berbeda-beda, ekstrusi material IHMB menggunakan mesin Single Screw Extruder, sistem mesin Co-extruder tidak berfungsi maksimal, dan Heater tidak berfungsi maksimal. Setelah improvement diterapkan kemudian dilakukan analisis perbandingan Independent-Sample T-Test. Hasil penelitian menunjukkan bahwa metode mixing material untuk mesin Co-extruder setiap Setter yang berbeda-beda sebelum ada SOP dibanding setelah ada SOP berbeda signifikan, sehingga faktor ini adalah paling dominan untuk meningkatkan kualitas dan menurunkan defect.
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Gangga Putra Mahardika, Agus Tjahjono, and Sumardi. "IDENTIFIKASI PENYEBAB RUSAKNYA HEAVY LIQUID CHAMBER PADA LO PURIFIER MITSUBISHI SJ25T DI MV. JINGU DENGAN METODE FTA." Dinamika Bahari 7, no. 2 (May 31, 2017): 1662–65. http://dx.doi.org/10.46484/db.v7i2.43.

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Minyak lumas merupakan kebutuhan yang sangat penting dalam pengoperasian permesinan di kapal baik untuk Mesin Induk maupun permesinan bantu. Maka dari itu sebagian besar kapal niaga dilengkapi dengan pesawat yang dapat menjaga kualitas minyak lumas yang disebut Lube Oil Purifier. Dimana pesawat ini fungsinya untuk membersihkan kotoran maupun kandungan air pada minyak lumas dengan proses purifikasi. Dalam penelitian ini penulis mempunyai beberapa masalah yang menjadi tujuan penulisan: faktor penyebab rusaknya heavy liquid chamber pada Lube Oil Purifier pada saat beroperasi, penilaian dengan metode FTA terhadap pencegahan terjadinya trouble pada Purifier saat beroperasi, dan langkah yang harus dilakukan jika mendeteksi abnormalitas pada purifier untuk mencegah kerusakan Lube Oil Purifier tersebut. Agar faktor yang dapat menyebabkan rusaknya heavy liquid chamber pada Lube Oil Purifier dan pencegahan terjadinya trouble serta kerusakan dapat diketahui maka dalam karya tulis ini penulis menggunakan analisa dengan metode Fault Tree Analysis (FTA). Metode FTA digunakan dalam menganalisa kejadian kegagalan dalam sistem. Metode FTA dapat didefinisikan sebagai analisa untuk mencari penyebab terjadinya masalah dari masalah puncak hingga menuju akar permasalahan menggunakan diagram pohon kegagalan dengan tujuan mencari faktor terkecil baik dari mesin maupun manusia yang dapat menyebabkan terjadinya suatu kegagalan tersebut. Dari hasil penelitian menggunakan metode FTA maka didapatkan faktor yang dapat menyebabkan kerusakan pada heavy liquid chamber dan trouble yang terjadi pada Lube Oil Purifier. Maka perawatan dan perbaikan pada setiap komponen perlu lebih diperhatikan, hal tersebut dapat dilakukan dengan mengikuti sistem perawatan berencana yang terdapat di setiap kapal yang telah ditentukan oleh perusahaan berdasarkan kebijakan perusahaan, instruction book dan makers. Selain itu pengawasan pada Lube Oil Purifier yang sedang beroperasi juga diperlukan untuk memantau kondisi pengoperasian. Pada kesimpulan dan saran dikemukakan tentang pentingnya mengadakan perawatan dan pemeriksaan secara rutin terhadap semua bagian yang beresiko menimbulkan trouble dan kerusakan pada Lube Oil Purifier. Bila didapati adanya trouble pada pengoperasian Lube Oil Purifier maka pengoperasian harus segera dihentikan dan dilakukan pengecekan.
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Dissertations / Theses on the topic "FTA diagram"

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Haluska, Lukáš. "Využití fuzzy clusteringu při modelování vlastností ztvrdlých betonů." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-233172.

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Compressive strength is one of the most monitored parameter of hardened concrete and it is usually determinated by destructive testing. Non-destructive testing applied on existing constructions uses regression analysis to estimate compressive strength. High variability of outputs and eventually failure of necessary requirements for using regression analysis complicate these methods. The aim of this thesis is to show posibility of using fuzzy clustering in this topic and to compare outputs with classic methods.
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Plíšek, Martin. "Nástroj pro podporu analýzy rizik v informační bezpečnosti." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2012. http://www.nusl.cz/ntk/nusl-236450.

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The master thesis deals with the development of the tool for risk analysis support in information security. At first we perform a theoretical basis for security development of lifecycle process (SDL). Afterwards the theory of risk analysis based on fault tree analysis is described. Considering this knowledge base system was designed and implemented. Next chapter describes the best practice refer to the typical example of use and presents the potencial using of this tool in practice. Final chapter deals with the possibility of future expansion of this application.
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Dvořáková, Tereza. "Funkční analýza konstrukce a vhodnosti použitého materiálu tepelného štítu turbodmychadla z hlediska spolehlivosti v podmínkách provozu běžného silničního motorového vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-402528.

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Diploma thesis deals with solving of the problem with heat shield used in a turbocharger for heavy duty vehicles. The description of the problem origin with focus on environmental standarts and therefore a need of changes in turbocharger construction, is included. Further, the procedure for finding the component failure causes using the results of stress tests and analyses performed is described step by step. Most of the practical part is focused on a use of quality tools for finding a root cause of heat shield failure and also on advanced material analysis, verifying the results from quality analysis performed. An the end of the thesis there are suggested and accepted measures for elimination of similar failure recurrence and recommendations for further development.
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Friberg, Adam. "Matrix Integrals : Calculating Matrix Integrals Using Feynman Diagrams." Thesis, Uppsala universitet, Teoretisk fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227928.

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In this project, we examine how integration over matrices is performed. We investigate and develop a method for calculating matrix integrals over the set of real square matrices. Matrix integrals are used for calculations in several different areas of physics and mathematics; for example quantum field theory, string theory, quantum chromodynamics, and random matrix theory. Our method consists of ways to apply perturbative Taylor expansions to the matrix integrals, reducing each term of the resulting Taylor series to a combinatorial problem using Wick's theorem, and representing the terms of the Wick sum graphically with the help of Feynman diagrams and fat graphs. We use the method in a few examples that aim to clearly demonstrate how to calculate the matrix integrals.
I detta projekt undersöker vi hur integration över matriser genomförs. Vi undersöker och utvecklar en metod för beräkning av matrisintegraler över mängden av alla reell-värda kvadratiska matriser. Matrisintegraler används för beräkningar i ett flertal olika områden inom fysik och matematik, till exempel kvantfältteori, strängteori, kvantkromodynamik och slumpmatristeori. Vår metod består av sätt att applicera perturbativa Taylorutvecklingar på matrisintegralerna, reducera varje term i den resulterande Taylorserien till ett kombinatoriellt problem med hjälp av Wicks sats, och att representera termerna i Wicksumman grafiskt med hjälp av Feynmandiagram. Vi använder metoden i några exempel som syftar till att klart demonstrera hur beräkningen av matrisintegraler går till.
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El, Mendoub El Bahloul Jakse Noël. "Etude théorique du diagramme de phases liquide-vapeur par les équations intégrales application aux fluides modèles /." Metz : Université Metz, 2008. ftp://ftp.scd.univ-metz.fr/pub/Theses/2008/El_Mendoub.El_Bahloul.SMZ0814.pdf.

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Yazi, Abdelilah GASSER JEAN GEORGES. "Contribution à l'étude des propriétés de transport électronique des alliages liquides de gallium à diagramme de phase métastable et à lacune de miscibilité AU-GA, GA-IN, GA-SN, CD-GA ET GA-HG /." [S.l.] : [s.n.], 1997. ftp://ftp.scd.univ-metz.fr/pub/Theses/1997/Yazi.Abdelilah.SMZ9729.pdf.

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Books on the topic "FTA diagram"

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Altman, Tracy A. FDA and USDA nutrition labeling guide: Decision diagrams, checklists, and regulations. Lancaster, Pa: Technomic Pub. Co., 1998.

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Book chapters on the topic "FTA diagram"

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Chishti, Irfan, Artie Basukoski, Thierry Chaussalet, and Neeraj Beeknoo. "Transformation of UML Activity Diagram for Enhanced Reasoning." In Proceedings of the Future Technologies Conference (FTC) 2018, 466–82. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-02683-7_33.

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Priss, Uta. "Set Visualisations with Euler and Hasse Diagrams." In Lecture Notes in Computer Science, 72–83. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72308-8_5.

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AbstractThis paper discusses set visualisations with concept lattices in the sense of Formal Concept Analysis (FCA) in contrast to visualisations with Euler diagrams. Both types of visualisations have advantages and disadvantages. Because of the connection between both fields and the body of knowledge that exists in both fields it is of interest to investigate whether results from either field can contribute to the other.
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Sanz, P. D., A. D. Molina-García, J. A. Carrasco, and F. Fernández-Martín. "Pressure Temperature Phase Diagrams of Some Fat Containing Foodstuffs: Milk Cream, Milk Fat." In Advances in High Pressure Bioscience and Biotechnology, 469–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60196-5_106.

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Márquez, Fausto Pedro García, Alberto Pliego Mangurán, and Noor Zaman. "Fault Tree Analysis (FTA) via Binary Diagram Decision (BDD) for Information Systems Design." In Software Development Techniques for Constructive Information Systems Design, 308–19. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-3679-8.ch016.

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A fault tree analysis (FTA) is presented as a qualitative method for studying the state of the WT as a system considering to its different sub-systems. The quantitative analysis of the FTA is done by Binary Diagram Decision (BDD). The size of the BDD generated by the transformation from FTA to BDD will depend of the ordering of the FTA events. This work employed the top-down-left-right, the level, and the “and” methods for listing the events. Finally, a classification of the events is done based on their importance measures. The importance measures has been calculated by the Birnbaum (1969), Critically and Structural heuristic methods. A comparative analysis is done, and the main results are presented.
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Pinheiro, Thiago, Danilo Oliveira, Rubens Matos, Bruno Silva, Paulo Pereira, Carlos Melo, Felipe Oliveira, Eduardo Tavares, Jamilson Dantas, and Paulo Maciel. "The Mercury Environment: A Modeling Tool for Performance and Dependability Evaluation." In Intelligent Environments 2021. IOS Press, 2021. http://dx.doi.org/10.3233/aise210075.

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It is important to be able to judge the performance or dependability metrics of a system and often we do so by using abstract models even when the system is in the conceptual phase. Evaluating a system by performing measurements can have a high temporal and/or financial cost, which may not be feasible. Mathematical models can provide estimates about system behavior and we need tools supporting different types of formalisms in order to compute desired metrics. The Mercury tool enables a range of models to be created and evaluated for supporting performance and dependability evaluations, such as reliability block diagrams (RBDs), dynamic RBDs (DRBDs), fault trees (FTs), stochastic Petri nets (SPNs), continuous and discrete-time Markov chains (CTMCs and DTMCs), as well as energy flow models (EFMs). In this paper, we introduce recent enhancements to Mercury, namely new SPN simulators, support to prioritized timed transitions, sensitivity analysis evaluation, several improvements to the usability of the tool, and support to DTMC and FT formalisms.
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Arévalo, Juan, Patricia Zamora, Vicente F. Mena, Naiara Hernández-Ibáñez, Victor Monsalvo-Garcia, and Frank Rogalla. "Design of the MIDES plant." In Microbial Desalination Cells for Low Energy Drinking Water, 93–104. IWA Publishing, 2021. http://dx.doi.org/10.2166/9781789062120_0093.

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Abstract This chapter presents the full design of two microbial desalination cells (MDCs) at pilot-plant scale from the MIDES project. The final MDC pilot unit design was based on the knowledge gained through up scaling of the MDC from lab- to prepilot scale. The MDC pilot plant consists of one stack of 15 MDC pilot units with 0.4 m2 electrode area. This chapter also presents the piping and instrumentation diagram (P&ID) and layout of the MDC pilot plant. The MIDES pilot plants are comprised of an MDC pilot plant housed in a 40-ft container with the rest of the peripheral elements. Finally, this chapter presents the improvement made from the first to the second MDC stack in terms of stability and the chemical compatibility of the end plates.
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Zinn-Justin, Jean. "Renormalization group approach to matrix models." In From Random Walks to Random Matrices, 493–500. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198787754.003.0025.

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Chapter 25 discusses how, in the mid–1980s, it was realized that some ensembles of random matrices in the large size and double scaling limit could be used as toy models for two–dimensional quantum gravity coupled to conformal matter and string theory, or as examples of critical statistical models (like the critical Ising model) on continuum random surfaces. The method is based on a perturbative expansion in terms of fat Feynman diagrams associated with tessalated surfaces, organized as a topological expansion. A tremendous development of random matrix theory followed, and a number of matrix models have been solved exactly. The solutions exhibit a universal behaviour with respect to changes of the matrix potential. Therefore, it is tempting to use renormalization group (RG) ideas to determine universal properties, without solving models explicitly. Approximate RG equations have been derived, yielding interesting results, but a strategy for systematic improvement is lacking.
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Wan, Benli, Bin Hu, Yuntao Li, and Yuhong Zhu. "Study on Effect of Electromagnetic Characteristics of Deformed 304 Stainless Steel on Eddy Current Testing." In Studies in Applied Electromagnetics and Mechanics. IOS Press, 2020. http://dx.doi.org/10.3233/saem200003.

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The induced ferrite and other high magnetic microstructures content changes are studied when 304 austenitic stainless steel stripe specimens are tested under different uniaxial tension deformation, namely its deformation less than 50%. Furtherly, the correlation is plotted between the resulting magnetic permeability or coercivity caused by these microstructures and deformation. Meanwhile, the optimal eddy current excitation frequency under different deformation was obtained, which was consistent with 3-D finite element analysis (FEA). Besides, other various factors affecting the quality of eddy current testing (ECT), such as temperature and conductivity, are also considered comprehensively during the tensile test. The results of the experiment and simulation calculation show that when the deformation is within 50% that necking deformation has occurred, the magnetic permeability of specimens increases with deformation, and gradually begin to have the magnetic properties of weak ferromagnetic materials, which also changes the optimal excitation frequency, which varies from 60 kHz to 110 kHz. Because of the electromagnetic response noise increase, the impedance plane diagrams of defects distort simultaneously, which leads to the quantitative evaluation error of defects.
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Conference papers on the topic "FTA diagram"

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Hu, Wensheng, Zhouhui Deng, and Yi Hong. "A method of FTA base on UML use case diagram." In 2011 9th International Conference on Reliability, Maintainability and Safety (ICRMS 2011). IEEE, 2011. http://dx.doi.org/10.1109/icrms.2011.5979366.

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Zhou, Zhenxu, Hao Nie, and Qin Zhang. "Design and Development of DeRisk: A Fault Tree Analysis Program Package." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-81291.

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Fault tree analysis (FTA) has been proven to be a very important tool and has been successfully applied to safety/reliability studies in nuclear, chemical, military, space industries/systems. Hitherto, several useful and popular FTA software/program packages have been developed, like CAFTA+, FAUNET, RiskSpectrum, SAPHIRE, RiskA etc. Minimum Cut Set (MCS) method is the most commonly used traditional FTA method. However, it suffers from low efficiency when solving remarkably large fault trees (FTs). To overcome the shortcomings of the traditional method, several new techniques are proposed such as Binary Decision Diagram (BDD), Zero-suppressed Binary Decision Diagram, (ZBDD) Petri Net (PN), Bayesian Network (BN) and Dynamic Uncertain Causality Graph (DUCG). DUCG is a newly presented Probabilistic Graphic Model to deal with systems with dynamics, uncertainties and logic cycles. DUCG is a good choice to analyze large FTs, in our previous papers, we have proved that any FT can be mapped into a DUCG graph and additional modeling and analytical power can be achieved. DeRisk is a DUCG embedded risk analysis program package written in C# for FTA and is designed as a powerful tool to assist reliability engineers. In this paper, the design schema and the main algorithms of DeRisk are introduced. DeRisk contains five parts: (1) A Graphical User Interface (GUI) Module which interacts with users; (2) A Preprocessing Module which preprocesses FTs (3) An Input Module which allows user to input necessary data by file or by command line; (4) A Calculation Module which offers qualitative/quantitative analysis; (5) An Output Module which outputs the results required by users. Some illustrative examples are used to verify the correctness and effectiveness of DeRisk.
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Murakami, Tamotsu, Yosuke Kikuchi, and Youji Hiraoka. "Knowledge Management for Fault Tree Analysis Based on Quantity Dimension Indexing." In ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/detc2008-49734.

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In this paper, the authors propose computerized support for fault tree analysis (FTA) based on a new design knowledge management approach called quantity dimension indexing. FTA is a method of analyzing and visualizing the causes of fault events by expanding a fault event hierarchically to its possible cause events and constructing a tree diagram representing the entire structure of the problem. When a designer finds or encounters a problem during a product design and development process, an effective way of ensuring the security and safety of the product is to identify all the possible causes of the problem by FTA and fix them. Although FTA is an effective method, it is not easy for a designer to construct a complete fault tree without any misunderstanding or oversight. A promising approach for supporting FTA is to utilize a computerized knowledge management method. Although many knowledge management techniques for literal expression have been developed, they are not necessarily suitable for managing the engineering design knowledge of physical phenomena. To solve this problem, the authors propose a new design knowledge management approach called quantity dimension indexing and computerized support for FTA such as the verification of consistency of a fault tree and fault tree construction advice. By analyzing fault tree examples based on actual design activities in a company, the possible feasibility and future promise of the proposed approach are indicated.
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Khayyati, Ahmad, and Mohammad Pourgol-Mohammad. "Developing an Efficient Approach for Unmanned Aerial Vehicle Reliability Analysis." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24079.

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Abstract Unmanned Aerial Vehicles (UAV) are increasingly get popularity in many applications. Their operation requires high level of safety and reliability to accomplish successful missions. In this study, the reliability was comparatively analyzed by different available approaches to select the efficient method. First, failure model of the system is developed. Then, three different scenarios are considered to study the effect of redundancies on the system reliability results. In the first scenario, there is no redundancy where in the second scenario there is only one redundant component and in the third scenario, there are three redundant components. Static reliability analysis such as Fault Tree Analysis (FTA), Reliability Block Diagram (RBD), Markov Chain (MC), and Bayesian Networks (BN) are applied on proposed scenarios and results are obtained. Regarding to time dependencies between redundant components, a dynamic-based methodology is also developed in this study through applying Dynamic Fault Tree (DFT) analysis. Proposed static and dynamic approaches are applied on an UAV as a case study and results are discussed. Finally, characteristics of each methodology and related conditions are clarified for selecting the efficient reliability analysis approach.
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Anderson, Richard G., Shannon L. Conner, Kathryn J. Demetri, So¨nke Holla¨nder, Andrea Maioli, and Thomas F. Timmons. "AP1000 Plant Availability Analysis in Accordance With the EUR." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75415.

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As part of the European Passive Pressurized Water reactor (EPP) Program, AP1000 plant availability analyses and studies were performed to show compliance with the European Utility Requirements (EUR) goal of an overall plant availability greater than 90%. The EUR annual Design Availability Factor averaged over a 20-year period is defined as a function of the reference duration and number of a pre-defined set of normal outages (e.g., regular refueling and maintenance, 10 years in-service inspection, turbine overhaul) as well as a function of expected forced outages. Reference duration for the regular outages has been evaluated on a deterministic basis using current experience tailored for the AP1000 18 month fuel cycle. Provision for special work has been addressed, also in a deterministic fashion, by assuming a steam generator replacement. Estimation of the annual forced outage has been addressed in a two-fold probabilistic fashion: the expected unavailability due to generic balance of plant and support systems have been derived on a system-level basis from historic operational data, relying on AP600 based information and on updated European operating plant historical information provided by European utilities participating in the EPP Program. Such system-specific analyses also addressed the evolution from the AP600 to the AP1000 design as well as EPP-specific issues (such as the increased Reactor Coolant Pumps (RCP) unavailability due to continuous use of a variable speed driver on a 50 Hz grid). A selected set of AP1000 front end systems have then been analyzed with a fully probabilistic approach by means of Fault Tree Analysis (FTA) and Reliability Block Diagram (RBD) techniques, using reliability data (i.e., failure rates and Mean Time To Repair (MTTR)) for basic components. Again, the evolution of the design from the AP600 and the previous EPP availability analysis has been factored into these studies. The result of the evaluation leads to an overall AP1000 Annual Design Availability of 93.7% averaged over a 20-year period. This exceeds the 90% EUR availability goal.
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Hamze, Ahmad Ali, Rasha Al-Taher, Anas Taji, Dana Yazbak, and Farid Abed. "Developing Interaction Diagram for BFRP-RC Short Columns using FEA." In 2019 8th International Conference on Modeling Simulation and Applied Optimization (ICMSAO). IEEE, 2019. http://dx.doi.org/10.1109/icmsao.2019.8880416.

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Oyamada, Kenji, and Shinji Konosu. "Development of Simplified Plastic Collapse Assessment Procedure for Elbow With an External Surface Flaw Simultaneously Subjected to Internal Pressure and External Bending Moment." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61162.

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A simplified assessment procedure using the p-M (internal pressure ratio and external bending moment ratio) diagram, which can evaluate the plastic collapse load for an elbow with an external surface flaw simultaneously subjected to internal pressure, p, and external bending moment, M, due to earthquake, etc., is derived. The p-M diagram evaluation is an easy way to visualize the status of components with a flaw. For an elbow with an external surface flaw, the already-proposed p-M diagram by one of authors for the cylindrical part of pressure equipment such as vessels, pipes, etc. with a surface flaw can be applied if the parameters proposed in this paper are used. The plastic collapse loads derived from the p-M diagram method are being verified by comparison with existing experimental and FEA results.
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Ribeiro Machado da Silva, Vinicius, Matheus Costa dos Santos, and Mario Alfredo Vignoles. "Lean Global Analysis of Marine Slender Structures With Machine Learning." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95147.

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Abstract The new age of oil and gas industry is being driven by cost effective solutions, aiming to provide cheaper, faster and better products/services. The industry 4.0 brings an opportunity to transform systems and processes to be more efficient, making use of digitalization and new technologies, including the use of artificial intelligence algorithms applied to engineering problems. In Brazilian offshore fields, the operating conditions for flexible riser applications (deep-water, mean wave frequencies, floating units and corrosive fluids) make the metallic layer’s fatigue failure mode one of the drivers in its design. In a daily basis, nonlinear dynamic finite element analysis uses regular wave scatter diagrams as an equivalent way to model the wave elevation, avoiding the time consuming irregular wave representation. The analysis performed with regular waves are faster but carries conservatisms with it. In a deep-water scenario, the wave height and period ranges of the wave scatter diagram can be refined to improve the fatigue results obtained, leading to a considerable increase in the total amount of wave classes that need to be evaluated. Great part of the wave classes has a very low participation in the total fatigue damage, spending an unnecessary time to analyze them. Helped by a robust design of simulation experiment (DoSE) and machine learning regressors, a lean representation of the regular wave scatter can be done, where some of them are simulated and the rest of the results can be accurately predicted. This paper presents the application of supervised learners that are used to predict riser fatigue damage at different riser locations, given partial simulations of a regular wave scatter diagram. The techniques support the strategy to reduce the total amount of fatigue analysis required within a project design phase. The focus stays on the evaluation of the fatigue of metallic layers at two main critical regions, bend stiffener and touch down zone. Hidden patterns inside each scatter diagram are discovered, minimizing the total number of finite element analysis (FEA) required. The amount of the wave class reduction starts from 50% going up to 75%, maintaining a good level of accuracy on the predicted damage values.
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Chell, Graham, Brian Gardner, Chong Rhee, and Pedro Vargas. "J-Based Failure Assessment Diagrams for Axially Cracked Pipes Under Pressure." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77145.

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This paper describes the results of performing a comprehensive matrix of J-based finite element analyses (FEA) of external and internal surface axial cracks in pressurized pipes. The computations were performed for a range of stress-strain behaviors and pipe sizes typical of gas and liquid transmission pipelines. The J results for the deepest and surface points on flaws are presented in the form of failure assessment curves (FACs) plotted on failure assessment diagrams (FADs). The FACs are consistent with the Level 3C and material specific Level 2B FADs used in BS 7910. Yield pressures derived from the FEA results are used to evaluate the FAD parameter Lr (= pressure/yield pressure) for the Level 3C FACs. This choice of yield pressures facilitates the collapse of the Level 3C FACs in the fully plastic region of the FAD onto material specific curves relatively independent of geometric features. The Level 3C FACs generated from the FEA J results show a strong dependence on crack size in the elastic-plastic part of the FADs, particularly for long flaws. In these cases, the Level 3C FACs fall inside the corresponding material specific FACs derived according to Level 2B procedures. The reason for this is thought related to the development of local and global yield mechanisms and the incorporation in Level 3C FACs of geometry dependencies which are ignored in Level 2B. It is concluded that the Level 2B procedures may not always be conservative for long deep axial flaws in pressurized pipes when used in conjunction with accurate (e.g. determined from FEA) global yield pressures. Similarly, account has to be taken of the transition from local to global yielding in J estimation schemes that are formulated as the sum of elastic and plastic components if these are not to be non-conservative in the transition from elastic to fully plastic behavior. A method is suggested for incorporating the local to global yielding transition in J estimation schemes that also reduces the geometry dependence of Level 3C FADs to facilitate their representation by approximately material specific (Level 2B-type) FADs applicable to axially flawed pipelines.
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Oyamada, Kenji, Shinji Konosu, and Takashi Ohno. "Discussion on a Comparative Study Among FFS Rules." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77606.

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Remaining Strength Factor (RSF) approach in Part 5 of API 579-1/ASME FFS-1 is an assessment method for a cylindrical component with a local metal loss based on surface correction factors. Also, reference stress solutions that are applied in the Failure Assessment Diagram (FAD) method for a cylindrical component with a crack-like flaw are provided in Annex D using surface correction factors. In the p-M diagram method that has been recently developed, reference stress solution for local metal loss evaluation in a cylindrical component is derived using bulging factors, which are similar but not identical to the surface correction factors used in API 579-1/ASME FFS-1. This paper describes the results of a comparative study among the RSF approach, reference stress solutions for the FAD method, and the p-M diagram method, in terms of plastic collapse evaluation of a cylindrical component. These results were compared with the FEA and experimental results to confirm how those estimated stresses could be validated. The results of the study also contain proposals for prospective modifications of API 579-1/ASME FFS-1.
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