Relevant bibliographies by topics / System Influence Diagrams (SIDs)

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

Academic literature on the topic 'System Influence Diagrams (SIDs)'

Author: Grafiati
Published: 25 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "System Influence Diagrams (SIDs)"

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Celik, Gokhan, Bilgin Kaftanoğlu, and Celalettin Karadogan. "Investigation of Influence Parameters on Forming Limit Diagrams of Aluminum Alloy-AA2024." Key Engineering Materials 473 (March 2011): 382–89. http://dx.doi.org/10.4028/www.scientific.net/kem.473.382.

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Sheet metal forming technology is the keyword for many industries such as aerospace, aeronautics and automobile industries. Customer expectations, quality and safety requirements and market competitions require sheet metal forming operations to be well analyzed before the process to fulfill all these requirements. In this study, combination of FEA (finite element analysis) and mechanical material characterization were used in order to improve sheet metal forming operations while considering cost and quality. On the material characterization side of the studies, simple uniaxial tensile tests were conducted to obtain anisotropy parameters and yield points along different directions and hydraulic bulge test (HBT) was performed to obtain plastic behavior of the material up to 0.7 strains. Deformation measurements were conducted using optical measurement system GOM-ARAMIS while a 60-ton hydraulic press; Zwick/Roell BUP600 was used to deform the sheet part AA2024-0 aluminum alloy. Effects of process parameters, which are initial material thickness, lubrication and punch speed, on sheet metal formability and forming limit diagrams (FLDs) were investigated. On the study of thickness effects, sheet metals those having 0.81mm, 1.27mm and 1.60mm thickness were tested. Punch velocities of 250mm/min, 500mm/min and 750mm/min were used to investigate effect of punch speed on formability of sheet metals. Finally, PTFE (Polytetrafluoroethylene), paraffin lubricated and dry conditions were presented to obtain friction effects. FE analyses were performed to simulate experiments and to obtain friction coefficients of different lubricants. Good correlations were observed between numerical simulations and experimental results.
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Neamt, Liviu, Alina Neamt, and Olivian Chiver. "Improved Procedure for Earth Fault Loop Impedance Measurement in TN Low-Voltage Network." Energies 14, no. 1 (January 2, 2021): 205. http://dx.doi.org/10.3390/en14010205.

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The difficulties and uncertainties related to earth fault loop impedance measurement are addressed in this paper. Based on the presentation of the measurement procedure implemented in the test equipment (diagrams and measured quantities, respectively, interpretation of results), the shortcomings and errors that accompany it are highlighted. The position in the power system, the influence of power transformers, and the use of effective quantities instead of phasors are important sources of errors, but, as will be seen, the switching of loads at the consumer sides and/or the occurrence of fault regimes during measurements can lead to the most serious impairment of the accuracy in the impedance assessment. The clarification of these aspects is achieved, both starting from the equivalent diagrams of the measurement circuits and the analytical interpretation of the phenomena associated with the measurements, as well as based on the modeling and simulation of TN low-voltage electrical distribution networks, in a specialized program, Eaton xSpider, which allows the complete and complex analysis of a large number of scenarios. Thus, essential conclusions were drawn regarding the level of errors and their causes, obviously, with the research coming with solutions to be implemented at the level of the measurement protocols of the devices used.
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Oprea, Corneliu I., Petre Panait, Zahraa M. Essam, Reda M. Abd El-Aal, and Mihai A. Gîrțu. "Photoexcitation Processes in Oligomethine Cyanine Dyes for Dye-Sensitized Solar Cells—Synthesis and Computational Study." Nanomaterials 10, no. 4 (April 2, 2020): 662. http://dx.doi.org/10.3390/nano10040662.

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We report density functional theory (DFT) calculations of three newly synthesized oligomethine cyanine-based dyes as potential TiO2-sensitizers in dye-sensitized solar cells. The three dyes have π-symmetry and the same acceptor side, terminating in the carboxylic anchor, but they differ through the π-bridge and the donor groups. We perform DFT and time-dependent DFT studies and present the electronic structure and optical properties of the dyes alone as well as adsorbed to the TiO2 nanocluster, to provide some predictions on the photovoltaic performance of the system. We analyze theoretically the factors that can influence the short circuit current and the open circuit voltage of the dye-sensitized solar cells. We examine the matching of the absorption spectra of the dye and dye-nanocluster system with the solar irradiation spectrum. We display the energy level diagrams and discuss the alignment between the excited state of the dyes and the conduction band edge of the oxide as well as between the redox level of the electrolyte and the ground state of the dyes. We determine the electron density of the key molecular orbitals and analyze comparatively the electron transfer from the dye to the semiconducting substrate. To put our findings in the right perspective we compare the results of our calculations with those obtained for a coumarin-based dye used in fabricating and testing actual devices, for which experimental data regarding the photovoltaic performance are available.
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Zhang, Nan, Yaoyao Shi, Zhen Chen, Hongxia Chen, Jia Liu, and Pan Zhao. "Chatter reliability prediction of side milling blisk." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 39, no. 1 (February 2021): 111–18. http://dx.doi.org/10.1051/jnwpu/20213910111.

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During the blisk side milling, the blade is thin and the tool suspension length is large, which is easy to occur milling system chatter. The wavy surface left by chatter has great effect on the surface roughness and service performance of the aero-engine blisk. To accurately predict the stability of the blisk side milling, the influence of random variables on the machining stability was considered. In this paper, the chatter reliability model of the blisk side milling system was established using the first-order second-moment method. The model takes structural parameters and spindle speed as random variables and chatter frequency as intermediate variables. The chatter reliability model was used to draw the reliability lobe diagram, which can be used to divide the machining reliability area. The effectiveness of this method was verified by experiments and compared with Monte Carlo method. The validation results showed that the reliability lobe diagram can be used to determine the stability probability prediction of blisk side milling and can replace the traditional stability lobe diagram.
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Rashid, H. S. J., C. S. Place, D. Mba, R. L. C. Keong, A. Healey, W. Kleine-Beek, and M. Romano. "Reliability model for helicopter main gearbox lubrication system using influence diagrams." Reliability Engineering & System Safety 139 (July 2015): 50–57. http://dx.doi.org/10.1016/j.ress.2015.01.021.

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Hsiao, Te Ching, and Shyh Chour Huang. "The Effect of Cutting Process Parameters on the Stability in Milling." Advanced Materials Research 887-888 (February 2014): 1200–1204. http://dx.doi.org/10.4028/www.scientific.net/amr.887-888.1200.

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In the milling process, the dynamic system in the cutting process is composed of the tool, workpiece, and machine tools themselves. Therefore the mill geometric parameter, workpiece material behavior, and the modal parameters of the cutting system all will influence the stability in milling. Using FLN method and convolution force model to predict the chatter stability of milling process, and discussing the effect of milling parameter on the stability in this article. According to the result: with the increase of the tool diameter, stiffness, damping ratio or the reducing of tangential cutting force coefficient and radial width of cut, the stability lobe diagram tends to move upward. With the increase of natural frequency, the stability lobe diagram tends to move to right side. With the increase of the number of tooth, the stability lobe diagram tends to move downward.
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Rashid, H. S. J., C. S. Place, D. Mba, R. Lim, A. Healey, W. Kleine-Beek, and M. Romano. "Helicopter MGB oil system failure analysis using influence diagrams and random failure probabilities." Engineering Failure Analysis 50 (April 2015): 7–19. http://dx.doi.org/10.1016/j.engfailanal.2014.12.013.

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Keita, G., A. Ricard, R. Audebert, E. Pezron, and L. Leibler. "The poly(vinyl alcohol)-borate system: influence of polyelectrolyte effects on phase diagrams." Polymer 36, no. 1 (January 1995): 49–54. http://dx.doi.org/10.1016/0032-3861(95)90674-q.

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Li, Hong-Tao, Gang Zhao, Ying-Xin Ji, and Yi-Chen Zhang. "Heat generation and side milling stability of titanium alloy." Thermal Science 24, no. 6 Part B (2020): 4033–40. http://dx.doi.org/10.2298/tsci2006033l.

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In this paper, the thermal generation and milling stability of titanium alloy during machining are investigated mainly. A new definition of processing behavior is given based on the principles of minimization, entity expression and combination, and a model of side milling behavior is constructed. Through a series of side milling orthogonal experiments on Ti-6Al-4V titanium alloy, the cutting forces under different process parameters are obtained. Further, the cutting force coefficients of the model is calculated by the complete average algorithm and the peak average algorithm, and the milling stability of the system is analyzed by a stability lobe diagram. The results show that the different cutting parameters have important influences on the milling stability of titanium alloy.
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Gregorczyk, Magdalena, and Andrzej Rysak. "The influence of the Lorenz system fractionality on its recurrensivity." MATEC Web of Conferences 252 (2019): 02006. http://dx.doi.org/10.1051/matecconf/201925202006.

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In this work, we investigate the recurrensivity of the Lorenz system with fractional order of derivatives occurring in its all three differential equations. Several solutions of the system for varying fractional orders of individual derivatives were calculated, which was followed by an analysis of changes in the selected recurrence quantifiers occurring due to modifications of the fractional orders {q1, q2, q3}. The results of the recurrence analysis were referred to the time series plots, phase diagrams and FFT spectra. The obtained results were finally used to examine the influence of fractional derivatives on the chaos - periodicity transition of the system dynamics.
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Dissertations / Theses on the topic "System Influence Diagrams (SIDs)"

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Alverson, Charlotte Y. "Exploring differences in teachers', administrators', and parents' preferences for data display and whether type of graphic display influences accuracy when extracting information /." Connect to title online (ProQuest), 2008. http://proquest.umi.com/pqdweb?did=1617305601&sid=4&Fmt=2&clientId=11238&RQT=309&VName=PQD.

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Thesis (Ph. D.)--University of Oregon, 2008.
Typescript. Includes vita and abstract. Includes bibliographical references (leaves 147-151). Also available online in ProQuest, free to University of Oregon users.
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De, Swardt Cecilia Jacoba. "A qualitative study of the competencies that should be covered by a specialised undergraduate degree in risk management." Diss., 2021. http://hdl.handle.net/10500/27531.

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Purpose The purpose of the research was firstly, to determine the competencies required of risk managers and secondly, to consider the implications of such competencies in determining possible modules for inclusion in the design of a specialised undergraduate qualification in Risk Management. Methodology A qualitative research approach was followed, involving focus group interview sessions as part of an Interactive Qualitative Analysis (IQA) research study. Focus Group 1 comprised of academics teaching risk management at public universities in South Africa, and Focus Group 2 comprised of risk management practitioners in South Africa. Findings The competencies identified are business management and risk management knowledge; attributes such as assertiveness and courage; values such as ethics and integrity; as well as people, business and technical skills. Research implications The unique contribution of the current research was the innovative use of IQA for data collection, the removal of subjectivity and the rigour in analysing and presenting the results. The results are a starting point or foundation for the design of a specialised undergraduate degree in risk management that will both meet the requirements of the risk management profession and will equip learners with the best possible combination of knowledge, skills, attributes, values and attitudes to effectively manage risk in organisations. The implications for further research are that a study of the design, benchmarking and validation of a curriculum framework for a specialised undergraduate degree in risk management could be conducted. The development of a curriculum framework or curriculum did not form part of the scope of this study.
Okokuqala inhloso yocwaningo, ukuthola amakhono adingekayo kubaphathi bezinhlekelele kanti okwesibili, ukubheka imiphumela yalokho kusebenza ekunqumeni amamojuli angafakwa ekwakhiweni kweziqu ezikhethekile ezingakaphothulwa ngabafundi ku-Risk Management. Kwalandelwa indlela yocwaningo efanelekile, ebandakanya izikhathi zokuxoxisana zamaqembu njengengxenye yocwaningo lwe-Interactive Qualitative Analysis (IQA). I-Focus Group yoku-1 inabafundi abafundisa ukulawulwa kwezinhlekelele emanyuvesi vi kahulumeni aseNingizimu Afrika, kanye neFocus Group yesi-2 inabasebenzi bokulawulwa kobungozi eNingizimu Afrika. Amakhono ahlonziwe ukuphathwa kwebhizinisi nolwazi lokulawulwa kobungozi; anezimpawu ezinjengokuzethemba kanye nokuba nesibindi; ubugugu obufana nokuziphatha nobuqotho; kanye nabantu, amakhono ebhizinisi nezobuchwepheshe.
Die doel van die studie was eerstens om die bekwaamhede waaroor risikobestuurders moet beskik te bepaal, en tweedens, wat die implikasies van sodanige bekwaamhede inhou vir die modules vir insluiting in die ontwerp van ‘n gespesialiseerde voorgraadse kwalifikasie in Risikobestuur. Die studie het ‘n kwalitatiewe navorsingsbenadering gevolg deur gebruik te maak van fokusgroepsessies as deel van ‘n Interaktiewe Kwalitatiewe Ontleding (IKO) navorsingstudie. Fokusgroep 1 het bestaan uit akademici wat risikobestuur by openbare universiteite in Suid-Afrika doseer, en Fokusgroep 2 het uit risikobestuurpraktisyns in Suid-Afrika bestaan. Die bekwaamhede wat identifiseer is, is kennis van ondernemingsbestuur en risikobestuur; eienskappe soos selfgeldendheid en moed; waardes soos etiek en integriteit; asook mense, sake en tegniese vaardighede.
Finance, Risk Management and Banking
M. Com. (Risk Management)
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Hinds, David Meade. "The dual credit teaching experience on high school and college campuses from the perspective of community college faculty." Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-05-5171.

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Hundreds of thousands of students earn credit toward both high school and college each year through dual credit programs. This research project used qualitative methods to elicit the story, the shared reality, of faculty who spend their time with these students. It is an important story to tell as legislators, community college and public school administrators, parents, and students are motivated to see these programs not only continue, but grow. System influence diagrams (SIDs) depicting the dual credit teaching experience on high school and college campuses were developed for two separate groups of community college faculty. The models were used for comparing the high school and college dual credit teaching environments. The results of this study support other research, suggesting there are important differences between the high school and college environments when teaching dual credit students. From an overall perspective, faculty found the community college campus environment superior to teaching on the high school campus for reasons related to facilities and technology, a sense of belonging in the larger organization, and the integration of dual credit students into a more traditional college environment.
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Tsai, Hsing-Kuo, and 蔡興國. "The Study of the Influence of the System Schema Teaching Strategy on Correcting the High School Students’ Misconceptions of Force and Enhancing their Drawing Ability of Force Diagrams." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/13585824895341911047.

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博士
國立彰化師範大學
科學教育研究所
100
The purpose of this study was to develop a system schema teaching strategy, and to explore the influence of this strategy on improving the high school students’ conceptions of force, correcting their misconceptions of force, and enhancing their drawing ability of force diagrams. In addition, the students’ acceptance of the system schema was also investigated. Quasi-experimental research method and semi-structured interview were implemented in the study. The subjects consisted of two classes of 11th graders. The researcher’s class consisting of 48 students was the experimental group that received the system schema instruction. Instructional materials included the introduction and working sheets of the system schema in addition to the physics textbook. The training of analyzing the force on system qualitatively was stressed in the experimental group. Another teacher’s class consisting of 49 students, the control group, received the traditional expository instruction. Instructional materials included only the physics textbook. The training of solving quantitative problems was stressed in the control group. Interviews with 10 students on the conceptions of force and 11 students on the force diagrams from the experimental group were conducted respectively to understand the influence of the teaching strategy on improving students’ conceptions of force, correcting their misconceptions of force, and enhancing the drawing ability of force diagrams. The research tools included “the Force Concept test”, “the outline of the interview on the Force Concept test”, “the Force Diagram test”, “the outline of the interview on the Force Diagram test”, and “the System Schema Acceptance questionnaire”.The results of the study were as follows: (1) System schema teaching strategy can improve the high school students’ conceptions of force, correct their misconceptions of force, and enhance the drawing ability of force diagrams; (2) Most students who received the system schema instruction thought system schemas could help to learn the concepts of force and draw force diagrams; (3) The lower students scored on the Force Concept pretest, the larger they made progress on the Force Concept learning through the system schema instruction; (4) Most students used system schemas to solve problems only when they encountered unfamiliar problems.
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Book chapters on the topic "System Influence Diagrams (SIDs)"

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Coyle, R. G. "Influence diagrams." In System Dynamics Modelling, 18–47. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4899-2935-8_2.

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Cooper, Hal James, Garud Iyengar, and Ching-Yung Lin. "Deep Influence Diagrams: An Interpretable and Robust Decision Support System." In Business Information Systems, 450–62. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20485-3_35.

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de Campos, Luis M., Juan M. Fernández-Luna, Juan F. Huete, and Alfonso E. Romero. "Influence Diagrams and Structured Retrieval: Garnata Implementing the SID and CID Models at INEX’06." In Comparative Evaluation of XML Information Retrieval Systems, 165–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-73888-6_17.

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Hsieh, Yen-Hao, and Soe-Tsyr Yuan. "Using System Dynamics to Analyze Customer Experience Design." In Technological Applications and Advancements in Service Science, Management, and Engineering, 264–81. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-1583-0.ch015.

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Today, customer experience design is an emerging research direction in the experience economy where good customer experiences can lead service providers to achieve their business goals. Customer expectation, another key point for designing service experiences, affects how customers really feel during service experience delivery, while service operation is another important factor must be taken into account. System dynamics, as an analytic tool, can provide designers with a different way of thinking by integrating these factors for customer experience design. Accordingly, this study not only models the process of customer experience design by using causal loop diagrams and stock and flow diagrams, but also analyzes how the feedback and time delay factors influence customer experience design based on the simulation results of system dynamics. According to the macro viewpoint of system dynamics, this paper analyzes these important factors within customer experience design.
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Heremans, Karel, and Koen Goossens. "Pressure-Tuning Spectroscopy of Proteins: Fourier Transform Infrared Studies in the Diamond Anvil Cell." In High Pressure Effects in Molecular Biophysics and Enzymology. Oxford University Press, 1996. http://dx.doi.org/10.1093/oso/9780195097221.003.0007.

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The effect of hydrostatic pressure on the secondary structure of proteins can be followed by Fourier transform infrared (FTIR) spectroscopy in the diamond anvil cell. Pressure-induced changes in the amide I’ region of the deconvolved spectrum are used to follow the features of the secondary structure up to 20 kbar. The changes in the side chains such as tyrosine also can be followed. A self-deconvolution and fitting procedure is presented that allows the determination of both pressure-induced and temperature-induced changes in the secondary structure of proteins. The method takes into account the elastic, as well as the possible conformational, effects on the spectral bands of the protein. Applications are presented on pressure-induced changes in several proteins. Attention is also given to the influence of inert cosolvents. The fundamental principles of the phase diagram of proteins are presented to clarify their importance for understanding the behavior of proteins under pressure at different temperatures. Our results show that the infrared technique explores unique aspects of the behavior of proteins under these extreme conditions. The study of the effects of pressure has received considerable attention in recent years (Balny et al., 1992; Silva & Weber, 1993). In general, low pressures induce reversible changes such as the dissociation of protein-protein complexes, the binding of ligands, and conformational changes. Pressures higher than about 5 kbar induce denaturation, which in most cases is irreversible. However, reports on a few proteins indicate that such high pressures may also cause reversible changes. One such protein is horse scrum albumin (Chen & Heremans, 1990). A molecular interpretation of these phenomenon is based on the fact that pressure mainly affects the volume of a system, thus damping the molecular fluctuations. Temperature effects are known to affect both the kinetic energy and the volume of the system. Early in this century, it was shown that one can cook an egg by subjecting it to high pressure (Bridgman, 1914). The appearance of the pressure-induced coagulum of egg white is quite different from the coagulum induced by temperature.
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"5.5 The institutions of the European Community The Treaty of Rome set up a range of institutions to make the European Community function. The number of institutions has steadily increased in the intervening decades and currently some of the most important and relevant for your purposes are: • the European Parliament; • the European Commission; • the Council of Ministers; • the European Court of Justice; • the Court of Auditors; • the European Central Bank (ECB); • the European Investment Bank (EIB) 5.5.5.1 The European Council (now known as the Council of the European Union) This is an important group and is often confused with the Council of Ministers (and of course the name makes it ripe for confusion with the Council of Europe discussed in 5.4.1.1, above, in relation to the ECHR). The Council of the European Union is made up of the heads of government of Member States with representatives from the Commission of the Union. Whilst such a group has been core in the idea of the Community from the beginning it is not part of the legal or executive institutions of the Union. It is purely composed of those with loyalty to the Member State but desiring to forward their own agenda alongside the Union. They meet twice a year or more if necessary and have the power to agree new treaties. What appears to be happening is that the Council of the European Union is exerting increasing power and influence on the policy of the Union whilst standing outside the institutions. 5.5.5.2 The important law making institutions Several institutions within the EC have essential roles in the law making process either as initiators of legislation or with the authority to make law. You will, of course, learn about these in detail in English legal system, EU and public law courses. The main ones are as follows: • the European Parliament; • the European Commission; • the Council of Ministers; • the European Council; • the ECB. These areas will be covered in detail in specific subjects such as English legal system and constitutional law but they will be discussed briefly and sometimes illustrated with tables or diagrams for two reasons: • to provide a quick overview that will hopefully aid reading set texts covering these areas; and." In Legal Method and Reasoning, 154. Routledge-Cavendish, 2012. http://dx.doi.org/10.4324/9781843145103-122.

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Conference papers on the topic "System Influence Diagrams (SIDs)"

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Ruiping Yuan, Bingwu Liu, and Jiansheng Zhang. "Software project risk analysis based on extended influence diagrams." In 2012 7th International Conference on System of Systems Engineering (SoSE). IEEE, 2012. http://dx.doi.org/10.1109/sysose.2012.6333582.

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Serva, M. A., J. Cooprider, and R. Lee. "Using influence diagrams for representing organizational and political factors in information system design." In Proceedings of the Twenty-Fifth Hawaii International Conference on System Sciences. IEEE, 1992. http://dx.doi.org/10.1109/hicss.1992.183512.

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Zhang, Enjie, Yinghou Jiao, Zhaobo Chen, Wenchao Mo, and Shuai Wang. "Parametric Influences on the Nonlinear Dynamic Responses of a Rotor-Bearing-Foundation-Labyrinth Seal System." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70920.

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The modern engineering industries rely heavily on the reliable operation of rotating machinery, e.g., steam turbine and gas turbine. These rotating machineries are inevitable to be excited by the unbalance mass forces, the oil film forces and seal forces. Moreover, the turbines installed in an aircraft as well as vessel are also excited by the base vibration. In order to retain the healthy operation and prolong the interval between overhauls, an enormous amount of experimental and theoretical investigations have been focused on the dynamic behaviors of the rotor system. The dynamic characteristics of the rotor system influenced by the single source of vibration, such as unbalance, flowing lubricating oil, sealing medium etc., and combined sources of vibration have also been thoroughly researched. However, the dynamic responses of the rotor-bearing-foundation system subjected to labyrinth seal forces have seldom been studied. Furthermore, the previous analyses of the rotor dynamics mostly were linear. In fact, the fluid film forces are strongly nonlinear functions of the displacement and velocity of the rotor. As a result, the rotordynamics of the turbine is highly nonlinear. It is not accurate enough to be considered from a linear point of view. Applying the energy method, this paper established a dynamic model of the rotor-bearing-foundation-labyrinth seal system. The influences of the geometrical parameters and operating conditions, such as mass eccentricities, inlet pressure and rotational speed etc., on the nonlinear dynamic behaviors of the rotor system are numerically studied. The responses of the same system excited by one side of and both sides of base movement are also comparatively analyzed by means of spectrum cascades, bifurcation diagrams and whirl orbits as well as Poincaré maps.
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Luo, Jian, Huayi Yin, Bo Li, and Changqing Wu. "Path planning for automated guided vehicles system via interactive dynamic influence diagrams with communication." In 2011 9th IEEE International Conference on Control and Automation (ICCA). IEEE, 2011. http://dx.doi.org/10.1109/icca.2011.6137906.

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Li, Cong, Jingliang Gu, and Haiqing Hu. "A new influence diagrams approach based on grey rough set for interval valued information system." In 2017 Chinese Automation Congress (CAC). IEEE, 2017. http://dx.doi.org/10.1109/cac.2017.8242727.

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Mo, Wenchao, Yinghou Jiao, Zhaobo Chen, and Enjie Zhang. "Stability Influence of Different Eccentric Phases in a Rotor-Bearing System." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70528.

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A dynamic model of a rotor–bearing system with two discs is proposed in this study. The effect of eccentric phases of two discs on the oil-film stability is investigated. Considering the gyroscopic effect, the nonlinear dynamic behavior of the rotor-bearing system with two discs is analyzed based on the Finite Element Method. Two sliding bearings are simulated by the unsteady nonlinear oil-film force based on the assumption of short bearing model. The Newmark integration method is adopted to solve the equation. The research focuses on the stable region considering the eccentric phases of two discs and nonlinear responses of the rotor–bearing system by using the Poincaré maps, bifurcation diagrams and spectrum cascades. The results indicate the influence of different eccentric phases of two discs on dynamic response. The relationship between the stable region of the rotor-bearing system and eccentric phases of two discs is obtained, which is very important for the design of the rotor-bearing system.
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Osborn, Mark, and LiJie Yu. "Decision Support for Remote Monitoring and Diagnostics of Aircraft Engine Using Influence Diagrams." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-28331.

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FAA regulations require the monitoring of all commercial aircraft engines to ensure airworthiness. In doing so, it provides economic advantages to engine owners to monitor engine performance and resolve identified issues in a timely manner to reduce operational costs or avoid secondary damage. Various remote monitoring and diagnostics service providers exist in the marketplace. However, a common understanding among most of them is that given limited time and information, it is an extremely difficult task to make quick and optimized decisions. Difficulties arise from the fact that an aircraft engine is a complex system and demands considerable expertise to diagnose, but also due to the uncertainty in estimating an engine’s true physical state because of measurement and process noise. Therefore, it is often difficult to decide what action to take in order to achieve the most desirable outcome. In this paper, a cost sensitive engine diagnostic and decision making methodology is described. Diagnostic tool performance at various decision thresholds is estimated over a large set of validated historical cases to evaluate sensitivity, specificity and other quality indices. These quality indices and a set of cost functions are utilized in influence diagrams to derive the optimized decision model in order to minimize costs given the uncertain engine condition and noisy parametric data.
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Wright, Leah, and Trevor Townsend. "SOCIODEMOGRAPHIC CHARACTERISTICS AS IT RELATES TO TRAVEL BEHAVIOUR IN SIDS: A CASE STUDY IN TRINIDAD." In International Conference on Emerging Trends in Engineering & Technology (IConETech-2020). Faculty of Engineering, The University of the West Indies, St. Augustine, 2020. http://dx.doi.org/10.47412/cpyi3065.

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The objective of this research was to analyse the relationship between sociodemographic characteristics and the travel behaviour of Trinidadians. Many studies have shown that a relationship exists between the socio-economic and sociodemographic characteristics of an individual and their travel patterns. A better understanding of this relationship can influence transportation policy decisions and therefore, aid in improvement to the overall transportation structure. This understanding of travel behaviour is of particular importance in developing countries and SIDS, where there is limited geographical space, economic constraints and an influx of competitive unregulated paratransit modes into the transportation system. Trinidad, like other developing countries and SIDS, has a public transportation system that is dominated by paratransit modes. More notably, there is increasing penetration of illegally operated paratransit modes, that are aggressively competing in the market and gaining a lot of traction. Data was collected in January 2018 using a revealed preference survey of commuters’ work-based tours in, Trincity, a middle-income housing area with good highway and public transportation access. Results showed that income, age, distance from workplace and gender all affect the likelihood of public transport usage as a primary mode of a work tour and there were gender-based differences in the incidence of walking as part of the tour. Additionally, although most public transportation users considered the government bus service as the safest and illegal paratransit services as the least safe, the usage of such services was more than five times that of the bus. The research points to important service and policy actions which need to be taken to encourage and support shifts to more sustainable modes.
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Maturana, Marcos Coelho, Victor Rafael Souza, Valentina Clavijo Mesa, Marcelo Ramos Martins, Anderson Takehiro Oshiro, and Adriana Miralles Schleder. "MIL and MIRO Diagrams for Risk-Based Positioning of Drilling Rigs With Dynamic Positioning System." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-18834.

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Abstract Currently, most offshore oil exploration operations are performed by Dynamically Positioned (DP) units; in Brazil, the use of these units is traditional in drilling operations (DP drilling rigs). The advent of DP systems, which allow the vessel to maintain a certain position without the need for anchor lines, has brought great flexibility to the oil field; however, usually in drilling areas, there are a large number of operations being performed simultaneously and subject to weather conditions and a failure of the DP system may cause these vessels to drift, which may occasionally result in a collision with other field equipment or vessels, causing material, personal and environmental damage. In this context, it is necessary to analyze what would be the best positioning points for these units according to the configuration of potential obstacles present in the area (such as risers, anchor systems and floating production systems), the characteristics of the DP unit and the expected environmental conditions. It is vital to know the risk of collision associated with the positioning of these units. The risk of collision will depend mainly on the meteo-oceanographic variables of the operating region, the hydrodynamic characteristics of the unit, the DP system reliability and its repair time, and the distribution of obstacles in the area. The objective of the ongoing research is the development of a methodology to define the risk associated with the positioning of the DP units, through a statistical method and a validated drift mathematical model under the influence of environmental agents. The proposed methodology allows us to demonstrate compliance with a widely accepted RAC (Risk Acceptance Criterion). The developed methodology proposes the use of two instruments: Location Iso-Probability Maps (MIL) and Operational Iso-Risk Maps (MIRO), to synthesize the information to the decision making about the operation of the DP units at a specific location, considering the overall collision risk (at MIRO) and the probability of the rig being at a specific location (at MIL).
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Bayles, Brenda K. Krkosska. "Recognize and Manipulate Pressure to Influence How Components Will Self-Assemble." In ASME 2013 2nd Global Congress on NanoEngineering for Medicine and Biology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/nemb2013-93047.

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How can we engineer components to assemble into complex structures in a reliable manner? Experimental methods rely on interactions such as surface properties, magnetic dipoles, charge, and polarizability. Here pressure is shown to have the power to hold a system together, or to take it apart. Specific diagrams give visual clues to the nature of the pressure that is present. The ability to identify the properties of pressure will allow researchers to manipulate pressure’s power to their advantage. DNA base pairing, polynucleotide chain properties, and an enzyme-catalyzed reaction are used as examples of self-assembling structures conforming to laws of pressure.
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