Bibliographies thématiques / DYNAMIC TROUBLESHOOTING

Littérature scientifique sur le sujet « DYNAMIC TROUBLESHOOTING »

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Publié le 26 octobre 2023

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Articles de revues sur le sujet "DYNAMIC TROUBLESHOOTING"

Jia, Mingxing, Zhiheng Pan, Guanghai Li, Chunhua Chen et Chen Wang. « A Fast Diagnosis Method of Escalator Reversal Faults Based on Dynamic Information and Multiattribute Decision-Making ». Journal of Mathematics 2021 (20 décembre 2021) : 1–10. http://dx.doi.org/10.1155/2021/6294869.

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There are many reasons for escalator reversal failure, and the reasons are distributed in different locations. It is difficult to locate the specific location of the fault in the actual fault troubleshooting. At the same time, the information related to the failure is not used in the troubleshooting, so there is a problem of inefficient troubleshooting. To this end, this paper proposes a multiattribute decision-making method that integrates dynamic information and gives the optimal troubleshooting order to improve the efficiency of the troubleshooting. First of all, according to the structure of the escalator components, the escalator reversal fault tree is established. Secondly, a static decision matrix is established by comprehensively considering the failure probability, search cost, and influence degree of the bottom event of the fault tree. Finally, the influence matrix of information on each attribute is given by the dynamic information obtained in troubleshooting, the static decision fusion influence matrix determines the dynamic decision matrix, the dynamic decision matrix is weighted and normalized, and the Technique for Order Preference by Similarity to Ideal Solution is used to determine the optimal troubleshooting order. Taking the reversal failure of a certain type of escalators as an example, the method of multiattribute decision-making of fusion dynamic information is used to shorten the troubleshooting time, improve the efficiency of troubleshooting, and verify the effectiveness of this method.

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Ariff, Idzham Fauzi Mohd, et Mardhiyah Bakir. « Dynamic Simulation of Petrochemical Wastewater Treatment Using Wastewater Plant Simulation Software ». MATEC Web of Conferences 203 (2018) : 03005. http://dx.doi.org/10.1051/matecconf/201820303005.

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A dynamic simulation model was developed, calibrated and validated for a petrochemical plant in Terengganu, Malaysia. Calibration and validation of the model was conducted based on plant monitoring data spanning 3 years resulting in a model accuracy (RMSD) for effluent chemical oxygen demand (COD), ammoniacal nitrogen (NH3-N) and total suspended solids (TSS) of ±11.7 mg/L, ±0.52 mg/L and ± 3.27 mg/L respectively. The simulation model has since been used for troubleshooting during plant upsets, planning of plant turnarounds and developing upgrade options. A case study is presented where the simulation model was used to assist in troubleshooting and rectification of a plant upset where ingress of a surfactant compound resulted in high effluent TSS and COD. The model was successfully used in the incident troubleshooting activities and provided critical insights that assisted the plant operators to quickly respond and bring back the system to normal, stable condition.

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Fath, J. L., C. M. Mitchell et T. Govindaraj. « An ICAI architecture for troubleshooting in complex, dynamic systems ». IEEE Transactions on Systems, Man, and Cybernetics 20, n^o 3 (1990) : 537–58. http://dx.doi.org/10.1109/21.57268.

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Jesse Huang, H. « An Adaptive Troubleshooting Model for Complex and Dynamic System ». IFAC Proceedings Volumes 28, n^o 15 (juin 1995) : 571–74. http://dx.doi.org/10.1016/s1474-6670(17)45293-1.

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Mobki, Hamed, Morteza Homayoun Sedighi, Aydin Azizi et Mir Mohammad Eskandari. « DESIGNING AN EFFICIENT OBSERVER FOR THE NON-LINEAR LIPSCHITZ SYSTEM TO TROUBLESHOOT AND DETECT SECONDARY FAULTS CONSIDERING LINEARIZING THE DYNAMIC ERROR ». Facta Universitatis, Series : Mechanical Engineering 20, n^o 3 (30 novembre 2022) : 677. http://dx.doi.org/10.22190/fume220528043m.

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The presence of faults in a system leads to a lower value for efficiency, accuracy and speed, and, in some cases, even a complete breakdown. Thus, early fault detection is a major factor in efficiency and productivity of the procedure. In recent decades, many research studies have been conducted on troubleshooting and secondary fault detection. The current work presents an efficient and novel observer design capable of stabilizing the residue and dynamic error for the nonlinear Lipschitz systems with faults as well as a troubleshooting analysis and determining the formation of secondary faults in defective systems. The observer is designed based on linearizing dynamic error considering uncertainty, disturbance, and defects by employing non-linear gain factors instead of using state transformation. The dynamic error and residue stabilization of a non-linear faulty system have been discussed as well as the likelihood of secondary fault generation. The results indicate that the observer is able to determine fault-emergence, fault-disappearance and secondary fault formation well and quite fast.

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Niu, Dapeng, Chenshu Qi, Guanghai Li, Hongru Li et Hali Pang. « Rapid Fault Diagnosis Method of Elevator System Based on Multiattribute Decision Making ». Shock and Vibration 2021 (8 octobre 2021) : 1–9. http://dx.doi.org/10.1155/2021/9939493.

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Fault tree analysis is often used in elevator fault diagnosis because of its simplicity and reliability. However, the traditional fault tree method has the problems of low efficiency due to ignoring location change of bottom events during troubleshooting. This paper proposes a rapid diagnosis method based on multiattribute decision making to solve the problem. The fault tree of the elevator system is constructed based on expert knowledge and multisource data, and the location-related matrix is constructed according to the complex vertical structure of the elevator. Then, the attributes of bottom events such as the failure probability, search cost, location time cost, and location-related attributes are comprehensively analyzed in this paper. Finally, the TOPSIS method for dynamic attributes is used based on the work above to achieve the optimal troubleshooting sequence of elevator vibration fault. The results show that the proposed method is more efficient when compared to the optimal troubleshooting sequence obtained by the traditional method.

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Wu, Song Lin, Shi Chao Li et Jun Zhao. « The Principle of Dynamic Diagnosis Based on Integrated Maintenance Information and its Application ». Applied Mechanics and Materials 385-386 (août 2013) : 1785–89. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.1785.

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Based on the concept of an integrated maintenance information system and related information environment, this paper discusses the process of troubleshooting in modern maintenance in detail, and gives a model of dynamic faults diagnosis, in which a reasoning program is designed through taking advantage of information fusion and time analysis. In the end, the authors present the logic process of dynamic diagnosis through a typical example, and propose a dynamic diagnostic system based on information fusion.

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Qin, S. Joe, Yingxiang Liu et Yining Dong. « Plant-wide troubleshooting and diagnosis using dynamic embedded latent feature analysis ». Computers & ; Chemical Engineering 152 (septembre 2021) : 107392. http://dx.doi.org/10.1016/j.compchemeng.2021.107392.

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Roldán-Pérez, Javier, Aurelio García-Cerrada, Juan Luis Zamora-Macho, Pedro Roncero-Sánchez et Enrique Acha. « Troubleshooting a digital repetitive controller for a versatile dynamic voltage restorer ». International Journal of Electrical Power & ; Energy Systems 57 (mai 2014) : 105–15. http://dx.doi.org/10.1016/j.ijepes.2013.11.054.

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Mircea, Alina, et Karl Popp. « Troubleshooting in Studying the Behavior of Ballast Stones using Molecular Dynamic Simulation ». PAMM 5, n^o 1 (décembre 2005) : 209–10. http://dx.doi.org/10.1002/pamm.200510082.

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Thèses sur le sujet "DYNAMIC TROUBLESHOOTING"

Krč, Pavel. « POMDPs for dynamic troubleshooting ». Master's thesis, 2010. http://www.nusl.cz/ntk/nusl-286390.

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Dynamic troubleshooting is a process of analysing a running system in real time, predicting or detecting possible problems, correcting them and acting so as to avoid them. When realised by a computer in its most generic form it is an optimum decision problem. The framework of partially observable Markov decision processes (POMDPs) is well suited for such problems as it allows modelling the uncertainty of the future evolution of the process as well as the limited knowledge about the current state and enables to presume its own future choices of actions that alter the system or gain knowledge about it. In this work the author provides an introduction to the theory of POMDPs and describes current POMDP solution algorithms with respect to their applicability for dynamic troubleshooting. Further he presents a speci c dynamic troubleshooting problem, solves it using generic POMDP solutions and proposes his own heuristic for it which can be easily generalised to a wider class of POMDP problems. He creates a Python programming language framework for solving POMDPs, implements the mentioned algorithms within it and tests them on the presented problem.

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PANCHAL, ANUJ. « DYNAMIC TROUBLESHOOTING OF SPECIFIC ETR -290 ALARMS IN A MPEG TRANSPORT STREAM ». Thesis, 2015. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14367.

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ABSTRACT The current scenario of Transport stream Monitoring and Analyzing is such that we are doing the analysis of the Transport Stream at the output end i.e. the Streams are analyzed at the receiver end and then the Troubleshooting is done by manually doing the required change and therefore is not dynamic. In this project the work has been done to analyze the output Transport stream just after the multiplexer output, and make changes to the transport stream after analyzing the stream for a specific ETR 290, Priority 1 alarm . All this is done without manual interception. For the real-time environment , the generated stream after Satellite Transmission are received back via a Ku,C band antenna and then are analyzed.. In this project the real time environment is simulated in the Multiplexing code itself .The Analyzer monitors the Multiplexed stream for a specific ETR-290 alarm and will make necessary changes in the repetition frequency of the that specific PID packet. The specific ETR-290 alarm we have taken here is PAT_error. The entire process takes place within the same Block wherein we don’t have to Increase or Decrease the Frequency of reception of a PAT packet by manually inserting the time frame. Here the Analyzer itself measure the PAT packet frequency and itself makes the adjustment whether to increase or decrease the frequency of that PAT packet by looping back to the multiplexer which generate PAT Packet..

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PANCHAL, ANUJ. « DYNAMIC TROUBLESHOOTING OF SPECIFIC ETR-290 ALARMS IN A MPEG TRANSPORT STREAM ». Thesis, 2011. http://dspace.dtu.ac.in:8080/jspui/handle/repository/19700.

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The current scenario of Transport stream Monitoring and Analyzing is such that we are doing the analysis of the Transport Stream at the output end i.e. the Streams are analyzed at the receiver end and then the Troubleshooting is done by manually doing the required change and therefore is not dynamic. In this project the work has been done to analyze the output Transport stream just after the multiplexer output, and make changes to the transport stream after analyzing the stream for a specific ETR 290, Priority 1 alarm . All this is done without manual interception. For the real-time environment , the generated stream after Satellite Transmission are received back via a Ku,C band antenna and then are analyzed.. In this project the real time environment is simulated in the Multiplexing code itself .The Analyzer monitors the Multiplexed stream for a specific ETR-290 alarm and will make necessary changes in the repetition frequency of the that specific PID packet. The specific ETR-290 alarm we have taken here is PAT_error. The entire process takes place within the same Block wherein we don’t have to Increase or Decrease the Frequency of reception of a PAT packet by manually inserting the time frame. Here the Analyzer itself measure the PAT packet frequency and itself makes the adjustment whether to increase or decrease the frequency of that PAT packet by looping back to the multiplexer which generate PAT Packet..

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Livres sur le sujet "DYNAMIC TROUBLESHOOTING"

IBM Data Management Solutions Education Services. Troubleshooting IBM INFORMIX Dynamic server. [United States?] : IBM Data Management Solutions Education Services, 2001.

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Dörfler, Peter. Flow-Induced Pulsation and Vibration in Hydroelectric Machinery : Engineer’s Guidebook for Planning, Design and Troubleshooting. London : Springer London, 2013.

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Flowinduced Pulsation And Vibration In Hydroelectric Machinery Engineers Guidebook For Planning Design And Troubleshooting. Springer, 2012.

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Sick, Mirjam, Peter Dörfler et André Coutu. Flow-Induced Pulsation and Vibration in Hydroelectric Machinery : Engineer's Guidebook for Planning, Design and Troubleshooting. Springer, 2012.

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Dörfler, Peter. Flow-Induced Pulsation and Vibration in Hydroelectric Machinery : Engineer's Guidebook for Planning, Design and Troubleshooting. Springer, 2014.

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Chapitres de livres sur le sujet "DYNAMIC TROUBLESHOOTING"

Racic, Zlatan, et Marin Racic. « Interpretation of Dynamic Data Plots for Troubleshooting and Resolving Vibration in Large Rotating Machinery ». Dans Mechanisms and Machine Science, 58–73. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99268-6_5.

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Rudvin, Mette. « Cross-cultural dynamics in community interpreting. Troubleshooting ». Dans Claims, Changes and Challenges in Translation Studies, 271–83. Amsterdam : John Benjamins Publishing Company, 2004. http://dx.doi.org/10.1075/btl.50.23rud.

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Huang, H. Jesse. « AN ADAPTIVE TROUBLESHOOTING MODEL FOR COMPLEX AND DYNAMIC SYSTEM ». Dans Analysis, Design and Evaluation of Man–Machine Systems 1995, 571–74. Elsevier, 1995. http://dx.doi.org/10.1016/b978-0-08-042370-8.50037-9.

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Mobley, R. Keith. « TROUBLESHOOTING HYDRAULIC SYSTEMS ». Dans Fluid Power Dynamics, 171–77. Elsevier, 2000. http://dx.doi.org/10.1016/b978-075067174-3/50061-5.

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Mobley, R. Keith. « TROUBLESHOOTING PNEUMATIC CIRCUITS ». Dans Fluid Power Dynamics, 264–73. Elsevier, 2000. http://dx.doi.org/10.1016/b978-075067174-3/50072-x.

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Recker, Margaret M., T. Govindaraj et Vijay Vasandani. « Troubleshooting Strategies in a Complex, Dynamical Domain ». Dans Proceedings of the Sixteenth Annual Conference of the Cognitive Science Society, 739–44. Routledge, 2019. http://dx.doi.org/10.4324/9781315789354-128.

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Williams, Monnica T., Erin C. Nghe, John Hart et Chad T. Wetterneck. « Troubleshooting Common Problems, Issues, and Resources ». Dans Sexual Obsessions in Obsessive-Compulsive Disorder, 285–312. Oxford University Press, 2019. http://dx.doi.org/10.1093/med-psych/9780190624798.003.0009.

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Practitioners working with OCD sufferers are sometimes presented with complicated issues that make it difficult to see significant progress within a client’s treatment. Being skilled at recognizing when treatment is at a standstill is important in and of itself. It is impossible to predict all of the problems that can arise, but being mindful of common glitches can support therapists in recognizing the barriers that sometimes make clients and therapists feel stuck. Discord within a client’s sense of self, fear, lack of trust, time management, family dynamics, and comorbidities are some of the common themes therapists see come up for their clients. There are also matters related to logistics and ethics that therapists may face. This chapter includes illustrations of real-life situations that therapists can take note of, as well as suggestions on how to address the obstacles to better support clients in reaching their goals for OCD wellness. Also included is a list of books, articles, and other resources.

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Hai-Jew, Shalin. « Real-Time in Cyberspace ». Dans Handbook of Research on E-Learning Applications for Career and Technical Education, 128–43. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-739-3.ch010.

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Using live, synchronous time effectively in an instructor-led e-learning course requires a clear understanding of the dynamics of real-time, live interactivity. Synchronous interactivity enables live learning, demonstrations, collaborations, lab simulations, human-driven simulations, desktop simulations, live multi-data-stream events, and plenty of valuable learning and training. These may include webinars, online conventions, chat sessions, interactive television, and interactive lectures in CTE. These synchronous events may be non-human-facilitated or human-facilitated. To maximize synchronous time requires pedagogical preparation and the training of participants, setting the pace, troubleshooting technological challenges, and striving to create accessibility pre-, during- and post-event. This chapter will address some strategies for using live sessions in career and technical education to optimize the synergies of real-time.

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Actes de conférences sur le sujet "DYNAMIC TROUBLESHOOTING"

Pournaghshband, Hassan, et Chris S. Bullock. « The use of dynamic tracing for troubleshooting ». Dans the 43rd annual southeast regional conference. New York, New York, USA : ACM Press, 2005. http://dx.doi.org/10.1145/1167253.1167321.

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Wang, Yongsheng, Jiangming Ding, Zhirong Liu et Wenshan Xu. « Simulation of Dynamic Characteristics of Waterjet and its Application on Troubleshooting ». Dans Waterjet Propulsion 5. RINA, 2008. http://dx.doi.org/10.3940/rina.wp.2008.10.

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Chang, Kevin, Sung Kwon et Kasra Naghshineh. « Dynamic Systems With SES Process for Vehicle Integration ». Dans ASME 2009 Dynamic Systems and Control Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/dscc2009-2503.

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This paper describes an integrated engineering environment developed by BAE Systems which combines an integration and test process called Simulation-Emulation-Stimulation (SES) using physics-based high-fidelity dynamic simulation models. This environment creates real-time vehicle simulations of system and electrical control behavior that enable the visibility of electronic component messages and signals at subsystem and system level. It is used to integrate tactical software and electronic components as well as to test and verify vehicle subsystem and system level requirements and performance. To further enhance the SES environment capability, high fidelity electronics simulation models utilized during integration to extend internal signal visibility and aid troubleshooting. With this integrated environment, vehicle electronics and software integration issues can be identified and resolved in a lab before on-vehicle integration occurs. This significantly reduces overall project risk to both schedule and cost.

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Harker, Roger G., et Gary W. Handelin. « Enhanced On-Line Machinery Condition Monitoring Through Automated Start-Up/Shutdown Vibration Data Acquisition ». Dans ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-272.

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There are many benefits available through on-line machinery condition monitoring during steady state operation. However, certain dynamic vibration data is only available during a machine’s start-up and shutdown. In the past, we have limited acquisition and reduction of this dynamic data to start-up commissioning, or while troubleshooting a specific problem. This paper explores new techniques available to automate start-up and shutdown dynamic data acquisition. It then describes an effective on-line machinery information system using these techniques.

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Anand, Saurabh, Eadie Azahar B. Rosland, Elsayed Ouda Ghonim, Latief Riyanto, Khairul Azhar B. Abu Bakar, Nurul Asyikin Bt Mohd Radzuan, Nusheena Bt Mat Khair et Shazana M. Zaki. « Troubleshooting Cable Deployed Thru Tubing Electrical Submersible Pumps : A Case Study from South East Asia ». Dans SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205614-ms.

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Abstract PETRONAS had embarked on an ambitious thru tubing ESP journey in 2016 and had installed global first truly rig less offshore Thru Tubing ESP (TTESP) in 2017. To replicate the success of the first installation, TTESP's were installed in Field – T. However, all these three TTESP's failed to produce fluids to surface. This paper provides the complete details of the troubleshooting exercise that was done to find the cause of failure in these wells. The 3 TTESP's in Field – T were installed as per procedure and was ready to be commissioned. However, during the commissioning, it was noticed that the discharge pressure of the ESP did not build-up and the TTESP's tripped due to high temperature after 15 – 30 mins of operation. Hence none of the 3 TTESP's could be successfully commissioned. Considering the strategic importance of TTESP's in PETRONAS's artificial lift plans, detailed troubleshooting exercise was done to find the root cause of failure to produce in these three wells. This troubleshooting exercise included diesel bull heading which gave some key pump performance related data. The three TTESP's installed in Field – T were of size 2.72" and had the potential to produce an average 1500 BLPD at 80% water cut. The TTESP deployment was fully rigless and was installed using 0.8" ESP power cable. The ESP and the cable was hung-off from the surface using a hanger – spool system. The entire system is complex, and the installation procedure needs to be proper to ensure a successful installation. The vast amount of data gathered during the commissioning and troubleshooting exercise was used for determining the failure reason and included preparation of static and dynamic well ESP model. After detailed technical investigative work, the team believes to have found the root cause of the issue which explains the data obtained during commission and troubleshooting phase. The detailed troubleshooting workflow and actual data obtained will be presented in this paper. A comprehensive list of lessons learnt will also be presented which includes very important aspects that needs to be considered during the design and installation of TTESP. The remedial plan is finalized and will be executed during next available weather window. The key benefit of a TTESP installation is its low cost which is 20% – 30% of a rig-based ESP workover in offshore. Hence it is expected that TTESP installations will pick-up globally and it's important for any operator to fully understand the TTESP systems and the potential pain points. PETRONAS has been a pioneer in TTESP field, and this paper will provide details on the learning curve during the TTESP journey.

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Rahman, Brian M., Greg T. Busch, Qadeer Ahmed et Giorgio Rizzoni. « Structural Analysis-Based Fault Diagnosis of Pneumatic Systems ». Dans ASME 2016 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/dscc2016-9888.

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A significant cost in industrial fluid systems is associated with system maintenance and unexpected downtime due to the troubleshooting and repair of system faults. In large complex systems, faults are often difficult to identify and predict, but recent advances in technology have enabled low-cost wireless-capable sensors, which can provide an unprecedented amount of data to system owners. Combining this data with knowledge of the system dynamics, and a methodical structural analysis-based fault diagnosis approach, provides new opportunities in the field of fault diagnostics. The goal of the project described in this paper is to develop methods to detect and diagnose faults in industrial fluid systems in order to minimize downtime costs and energy losses, with minimum system capital cost in mind. This paper summarizes a portion of the first phase of this project, which focuses on fault modeling of a small-scale compressed-air test bench. Specifically, the design of the test bench, creation and validation of a flow model used to understand the test bench system dynamics, fault and structural analysis of an element of the test bench (an orifice-pipe combination), and the generation of a sensor installation guide that indicates what type and where to place sensors to detect and isolate faults that may occur. The sensor installation guide provided insight that all faults in the orifice-pipe element were detectable and isolable to the desired level with only a pressure sensor in the orifice and pipe. Orifice and orifice pressure sensor faults were uniquely isolable, but pipe and pipe pressure sensor faults were only isolable.

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Ali, Ahmed Maher, Mohamed Nagy Negm, Hatem Mohamed Darwish et Khaled Mohamed Mansour. « Strategic Modelling Approach for Optimizing and Troubleshooting Gas Lifted Wells : Monitoring, Modelling, Problems Identification and Solutions Recommendations ». Dans Gas & Oil Technology Showcase and Conference. SPE, 2023. http://dx.doi.org/10.2118/214053-ms.

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Abstract Offshore gas-lifted wells are challenging due to the numerous factors affecting performance, starting from the surface gas compression facility to reservoir performance. Mature oil fields add more challenges due to many flow assurance and mechanical problems. Real-time well monitoring is a must for early problem identification. Also, performance modeling is powerful and helpful for identifying and rectifying problems early. The work here emphasizes an optimization strategy for offshore gas-lifted wells. This paper introduces cases of offshore problematic gas-lifted wells and their full optimization and problems solving strategy to be utilized as an integrated approach for solving the problems of similar problematic gas-lifted wells in any field. The recommended strategy depends on studying problematic gas-lifting wells covering some commonly encountered problems. The recommended remedial actions for the selected problematic cases in this intensive study resulted in precious oil gains, cost savings, and gas lift usage optimization. The solution combines surveillance, multiphase simulation, data analytics, and operations. This paper discusses three major problems and the strategy to solve them: the first is wells with erroneous surface gas measurement and excessive gas injection; the second is unstable gas-lifted wells, and the third is optimizing low reservoir deliverability gas-lifted wells. In addition, other individual optimization cases, including integrated full-field cases, are introduced for the recommended strategy's completeness. This comprehensive study finds that the optimum approach for rectifying most gas-lifted wells problems must start with real-time monitoring, then modeling the case, and end by recommending possible solution scenarios and their impact on optimizing well performance. This study brings the significance of surveillance and dynamic simulations in the overall production cycle: planning to operations. Further, dynamic simulations also help arrive at operators’ guidelines on avoiding failed start-ups and ensuring stable operation. Finally, the power of integration between different disciplines is shown by incorporating several subsurface and surface information in the uncertainty study.

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Dorodnykh, N. O., Y. V. Kotlov, O. A. Nikolaychuk, V. M. Popov et A. Y. Yurin. « End-user development of knowledge bases for semi-automated formation of task cards ». Dans 3rd International Workshop on Information, Computation, and Control Systems for Distributed Environments 2021. Crossref, 2021. http://dx.doi.org/10.47350/iccs-de.2021.05.

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The complexity of creating artificial intelligence applications remains high. One of the factors that cause such complexity is the high qualification requirements for developers in the field of programming. Development complexity can be reduced by using methods and tools based on a paradigm known as End-user development. One of the problems that requires the application of the methods of this paradigm is the development of intelligent systems for supporting the search and troubleshooting onboard aircraft. Some tasks connected with this problem are identified, including the task of dynamic formation of task cards for troubleshooting in terms of forming a list of operations. This paper presents a solution to this problem based on some principles of End-user development: model-driven development, visual programming, and wizard form-filling. In particular, an extension of the Prototyping expert systems based on transformations technology, which implements the End-user development, is proposed in the context of the problem to be solved for Sukhoi Superjet aircraft. The main contribution of the work is as follows: expanded the main technology method by supporting event trees formalism (as a popular expert method for formalizing scenarios for the development of problem situations and their localization); created a domain-specific tool (namely, Extended event tree editor) for building standard and extended event trees, including for diagnostic tasks; developed a module for supporting transformations of XML-like event tree representation format for the knowledge base prototyping system – Personal knowledge base designer. A description of the proposed extension and the means of its implementation, as well as an illustrative example, are provided.

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Alves, Paul. « Modeling and Simulation : A User’s Perspective ». Dans 2000 3rd International Pipeline Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/ipc2000-275.

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Lighter structures, specialty materials, higher rotational speeds, greater flows, higher temperatures and horsepower, all lead to higher efficiencies and less pollution. The designs of mechanical systems are being pushed to great extremes and therefore call for much greater accuracy in modeling the systems. The work of the design engineer has been facilitated immensely over the past few years by the introduction of computerized modeling tools. Stress Finite Element Modeling, Rotordynamic Analysis, Computerized Fluid Dynamics and Modal Analysis are some of these tools. They are also used extensively in the audit of designs if troubleshooting of a dynamic system becomes a requirement. The primary intent of this paper is to give the reader, the ability to coordinate the modeling work in an intelligent and authoritative way when he/she is not the one actually entering the numbers. It should also offer a clear idea of what the objectives of such analyses are, and an understanding of how these modeling techniques work, with their limitations and requirements, and sufficient knowledge to make decisions about the acceptability of the design.

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Motriuk, Roman W., Timothy Schmidt, John Webster et Thangavel Thevar. « Determination of Dynamic Velocity and Strain Using Wide Field Holographic Interferometry : Verification ». Dans 2000 3rd International Pipeline Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/ipc2000-276.

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High power and high capacity turbo-compressor systems frequently sustain acoustically induced vibrations. Higher order acoustic modes generated by turbo-compressors often couple selectively with structural pipe resonances producing significant increase in pipe wall vibration. In some instances, these coincidences generate high local stress levels that fatigue pipe shell or pipe attachments. In order to judge the level of dynamic strain and stress in piping systems, elaborate theories are employed. However, these are frequently not practical and relatively difficult to use in industrial applications, for example, in troubleshooting process. First, the accuracy of predicted results depends on assumed boundary conditions. The boundary conditions for on-site cases are rarely known and always difficult to estimate. Second, strains and stresses are complex and often difficult to determine, since they vary in space and time and may be caused by a multimode frequency excitation. Therefore, the strain and stress can only be predicted in reasonable bounds through laborious sensitivity and error analyses, which add further complexity to the already convoluted mathematical predictions. The correct stress level prediction in a structure, by means of directly measured vibrational velocity levels, is very desirable. Therefore, accurate mapping of the vibrational field is necessary. Since the mapping or evaluating of complex vibrational fields is very tedious and expensive using conventional technology (ample number of strain gauges or accelerometers), an alternative technique has been developed: wide field pulsed holographic interferometry. This method provides three dimensional field images of vibrating structures allowing extraction of the actual vibrational responses (displacement and velocity), and calculation of dynamic strain and stress information. These are described by their gradient, peak and phase values obtained from the holograms documenting vibrational fields. This paper describes empirical verification of the wide field pulsed holographic technology which is used to predict a service life of the complex piping structure subjected to multimode frequency excitation. The experimental work was carried out on a sample thin wall vessel, which was either empty or partially filled with water and excited by the hammer or shaker. Through the conversion of vibrational response levels into strain (and stress level), and verification of the conversion against strain gauge measurement results, the technology is proven as a diagnostic tool. It is concluded that there are many advantages of using holography to evaluate complex vibrational fields. They include: i) ‘instant’ results, ii) non-intrusive nature (i.e. the machinery subject to testing can operate without interruptions), iii) satisfactory accuracy, iv) complete and permanent records, and v) significant savings of time and money due to reducing the analysis effort and implementation of suitable recommendations.

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