Academic literature on the topic 'C-ITS services simulation'
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Journal articles on the topic "C-ITS services simulation"
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Strzelecka, Anna, and Piotr Skworcow. "Modelling and Simulation of Utility Service Provision for Sustainable Communities." International Journal of Electronics and Telecommunications 58, no. 4 (December 1, 2012): 389–96. http://dx.doi.org/10.2478/v10177-012-0053-z.
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Abstract Utility service provision is designed to satisfy basic human needs. The main objective of the research is to investigate mathematical methods for evaluating the feasibility of using a more efficient approach for utility services provision, compared to the current diversity of utility products delivered to households. Possibilities for alternative utility service provision that lead to more sustainable solutions include reducing the number of delivered utility products, on-site recycling and use of locally available natural resources. The core of the proposed approach is the simulation system that enables carrying out feasibility study of so-called transformation graph, which describes direct transformations and indirect transformations of the utility products into defined services. The simulation system was implemented in C# and .NET 3.5, while the XML database was implemented using eXist-db. The XML database stores information about all devices, utility products, services and technologies that can be used to define and solve services-provision problems. An example of such problem and its solution is presented in this paper. This research is a part of the All-in-One Project.
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Obaid, Mohammed, and Zsolt Szalay. "A Novel Model Representation Framework for Cooperative Intelligent Transport Systems." Periodica Polytechnica Transportation Engineering 48, no. 1 (May 21, 2019): 39–44. http://dx.doi.org/10.3311/pptr.13759.
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Cooperative Intelligent Transport Systems is C-ITS a set of ITS technologies that can provide services supported by the permanent, real time, information circulation among the components of the system. The paper aims to give an overview related to the modelling and evaluation possibilities of cooperative intelligent transportation system and to clarify the definition of the C-ITS and its differences from the regular ITS solutions. The paper introduce a proposed architecture of C-ITS modelling framework by describing C-ITS components, transferred data and its applications.
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Goleva, Rossitza, Mariya Goleva, Dimitar Atamian, Tashko Nikolov, and Kostadin Golev. "Quality of Service System Approximation in IP Networks." Serdica Journal of Computing 2, no. 1 (March 17, 2008): 45–56. http://dx.doi.org/10.55630/sjc.2008.2.45-56.
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This paper presents Quality of Service analyses in wired and wireless IP networks based on the three popular techniques – RSVP, IntServ, and DiffServ. The analyses are based on a quick approximation schema of the traffic system with static and dynamic changes of the system bounds. We offer a simulation approach where a typical leaky bucket model is ap- proximated with a G/D/1/k traffic system with flexible bounds in waiting time, loss and priority. The approach is applied for two cascaded leaky buckets. The derived traffic system is programmed in C++. The simula- tion model is flexible to the dynamic traffic changes and priorities. Student criterion is applied in the simulation program to prove results. The results of the simulation demonstrate the viability of the proposed solution and its applicability for fast system reconfiguration in dynamic environmental circumstances. The simulated services cover a typical range of types of traffic sources like VoIP, LAN emulation and transaction exchange.
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Wang, Ranghui, Qing Peng, Weidong Zhang, Wenfei Zhao, Chunwei Liu, and Limin Zhou. "Ecohydrological Service Characteristics of Qilian Mountain Ecosystem in the Next 30 Years Based on Scenario Simulation." Sustainability 14, no. 3 (February 5, 2022): 1819. http://dx.doi.org/10.3390/su14031819.
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Mountain ecosystems have special ecohydrological services, and the study of water conservation and soil conservation services in the Qilian Mountain Ecosystem (QLME) in China has important theoretical value for scientific understanding of the ecological processes and mechanisms of mountain ecosystems. In this study, we quantitatively estimated the spatial-temporal changes of water conservation and soil conservation services in the QLME based on the Integrated Valuation of Ecosystem Services and Tradeoffs (InVEST) model and estimated the future ecosystem services (ESS) of the QLME under RCP4.5 (Representative Concentration Pathways) and RCP8.5 scenarios using the coupled Geosos-FLUS model. Firstly, the QLME ecohydrological service increased from 1985 to 2018, and its spatial heterogeneity was high in the east and low in the west. Among them, water conservation first decreased and then showed a trend of fluctuating increase, and soil conservation services decreased sharply from 2010 to 2015. Secondly, there are differences in the ecohydrological services of the QLME under different land-use types. The water conservation capacity in descending order is glacier snow, grassland, forest land, wetland, and cultivated land. The soil conservation intensity from strong to weak is woodland, grassland, arable land, glacier snow, and bare land. Thirdly, under different scenarios, QLME water conservation and soil conservation functions will increase to varying degrees over the next 30 years. The water conservation in the RCP4.5 scenario is higher than that in the RCP8.5 scenario, and the higher discharge scenario will lead to the decline of the water conservation service function. The increased rate of soil conservation was greater under the RCP8.5 scenario. With the development of Nationally Determined Contributions (NDCs) and scenarios below 2 °C, the future of QLME ecohydrological services will be further understood.
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Rafsyam, Yenniwarti, and Jonifan Jonifan. "PENDETEKSIAN KERUSAKAN MODUL PADA TRANSMISI SATELIT PT. TELKOM RO PADANG MENGGUNAKAN BORLAND C++." Elektron : Jurnal Ilmiah 1, no. 2 (December 18, 2009): 53–60. http://dx.doi.org/10.30630/eji.1.2.21.
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Detection of module damage at satellite transmission designed to be able to detect damage of transmission equipment especially at satellite transmission of PT. Telkom RO Padang. Module detected is a modem IDR (CDM 550). The system is an output of modem that will be an input at PC where its detection using interface RS-232 and C++. So that, from communications between modem with PC resulting file error.txt. That file containing of damage status from modem. This Simulation expected to help the technician to detect the damage at satellite transmission equipment. This system more economical and give the best services to customers.
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Shapovalova, Irina, and Alexander Pavlov. "Transformations in the Recruiting Services and Digitalization." SHS Web of Conferences 93 (2021): 04005. http://dx.doi.org/10.1051/shsconf/20219304005.
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The article discusses a scope of relevant issues concerning recruitment market; in particular, its analysis in the conditions of digitalization. It assesses the companies’ strategies of the economic behavior and defines their priority development strategies while focusing on the outcome of each applied strategy. The study determines the role of the employee in the digital economy and the role of the recruiting services in the service industry. Its main objective is to review and study the digital processes inherent to the recruitment industry as well as the tendencies in the recruitment market and to outline the principles of work and organization of recruitment agencies. The theoretical background of the study is based on the related publications by Russian and foreign researchers dedicated to a wide range of issues; the ones subject to analysis include development of Russia’s recruitment market in retrospect, current condition of the recruitment market, pros and cons of artificial intelligence technologies used in the field and prospects of gaining profit from using both artificial intelligence technologies and regular employees in the key areas of HR agencies’ work (staffing, training, job simulation). Much attention is paid to the distance work performed by HR agencies, specifically, to b-2-b and b-2-c concepts as well as to the digital platforms providing for the performance of such activities. Additionally, the research deals with the complexities and bottlenecks that recruitment agencies face with when working with the digital environment; it provides examples of the transformation processes that have been observed in the principles of the HR technologies application due to the digitalization effects and elicits the omnipresence of the digital environment in all the branches of the recruiting services while suggesting efficient tools, platforms and patterns that can be workable in the industry.
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Silva, Rodrigo, and Heitor Silvério Lopes. "A Benchmark for Multi-Objective Routing in Vehicle Ad-Hoc Networks Using The Ant Colony Optimization Algorithm." Learning and Nonlinear Models 19, no. 2 (December 31, 2021): 15–28. http://dx.doi.org/10.21528/lnlm-vol19-no2-art2.
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The growing number of vehicles in cities has a great impact on our quality of life, such as air and noise pollution, traffic jams and traffic accidents. Cooperative Intelligent Transportation System (C-ITS) relies on communication technologies to provide innovative services and applications for transportation and traffic management. In the C-ITS context, users, roadside infrastructure and vehicles need to be connected and, for this purpose, a wide variety of wireless technologies can be used (e.g, vehicular WiFi, cellular and visible light communication). In this work we consider a VANET (Vehicular Ad-hoc NETwork) using vehicular WiFi (based on 802.11p). The communications in VANET networks have been studied for years and several routing algorithms have been developed for such a kind of network. However, a benchmark to compare the performance of such algorithms is still lacking. To fill this gap, the present work proposes a benchmark composed by instances of data routing for different scenarios in the VANET. Moreover, we propose a multi-objective algorithm based on ACO (Ant Colony Optimization) to compare with such benchmark. The results of simulations show the impact of several factors in the VANET connectivity, such as vehicle density, geographical location, propagation and fading models. The results are promising and indicate the importance of choosing appropriated simulation models.
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Petrov, Tibor, Lukas Sevcik, Peter Pocta, and Milan Dado. "A Performance Benchmark for Dedicated Short-Range Communications and LTE-Based Cellular-V2X in the Context of Vehicle-to-Infrastructure Communication and Urban Scenarios." Sensors 21, no. 15 (July 28, 2021): 5095. http://dx.doi.org/10.3390/s21155095.
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For more than a decade, communication systems based on the IEEE 802.11p technology—often referred to as Dedicated Short-Range Communications (DSRC)—have been considered a de facto industry standard for Vehicle-to-Infrastructure (V2I) communication. The technology, however, is often criticized for its poor scalability, its suboptimal channel access method, and the need to install additional roadside infrastructure. In 3GPP Release 14, the functionality of existing cellular networks has been extended to support V2X use cases in an attempt to address the well-known drawbacks of the DSRC. In this paper, we present a complex simulation study in order to benchmark both technologies in a V2I communication context and an urban scenario. In particular, we compare the DSRC, LTE in the infrastructural mode (LTE-I), and LTE Device-to-Device (LTE-D2D) mode 3 in terms of the average end-to-end delay and Packet Delivery Ratio (PDR) under varying communication conditions achieved through the variation of the communication perimeter, message generation frequency, and road traffic intensity. The obtained results are put into the context of the networking and connectivity requirements of the most popular V2I C-ITS services. The simulation results indicate that only the DSRC technology is able to support the investigated V2I communication scenarios without any major limitations, achieving an average end-to-end delay of less than 100 milliseconds and a PDR above 96% in all of the investigated simulation scenarios. The LTE-I is applicable for the most of the low-frequency V2I services in a limited communication perimeter (<600 m) and for lower traffic intensities (<1000 vehicles per hour), achieving a delay pf less than 500 milliseconds and a PDR of up to 92%. The LTE-D2D in mode 3 achieves too great of an end-to-end delay (above 1000 milliseconds) and a PDR below 72%; thus, it is not suitable for the V2I services under consideration in a perimeter larger than 200 m. Moreover, the LTE-D2D mode 3 is very sensitive to the distance between the transmitter and its serving eNodeB, which heavily impacts the PDR achieved.
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Berecz, Antónia, and György Ágoston. "The Hungarian adaptation of ilias web-based L(C)MS and its use in information education with a special regard to services tailoring." Pollack Periodica 2, Supplement 1 (December 2007): 71–84. http://dx.doi.org/10.1556/pollack.2.2007.s.7.
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ARUTIUNIAN, I., N. DANKEVYCH, and D. SAIKOV. "EFFICIENCY EVALUATION OF ORGANISATIONAL PROCESSES SYSTEM IN A BUILDING PRODUCTION WITH SIMULATION MODELING FOR CONTRACTING COMPANIES." Bridges and tunnels: Theory, Research, Practice, no. 19 (July 27, 2021): 99–107. http://dx.doi.org/10.15802/bttrp2021/233993.
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Purpose. This paper presents the innovative scientifically-based method on efficiency evaluation of the building production management for contracting companies. Otimisation models are substantially aimed at reducing the influence of negative factors and increasing the quality indexes of the organisational process of construction production. Methodology. Methodological approaches of the organisational processes optimisation of construction production are based on the establishment of a well-defined interconnection between the units of the functional structure, the definition of strategies hierarchy of the contracting company.The correlation of duration t and cost c in building production, its influence on the economic appropriateness for projects realisation in civil engineering are analyzed. Findings. Using mathematical analysing methods for cumulative distribution function S(t,c) of two-dimensional random value of construction duration and cost, the basic principles are shown that allow to qualitatively and quantitatively determine the level of influence of the construction market external factors on the implementation of organisational processes in the construction industry, in which a large number of forming elements are involved. The implementation of this methodology permits to assess the real state of organisational processes system in building production, its stability, the degree of determinate indicators structuring in a single functional system, to generate an economic justification in complex. On basis of simulation modeling, efficiency of organisational processes system in building production S(t,c) was determined and graphically illustrated. Originality. The results of the present study demonstrate that it amounted to 58.08 % within the established limits of acceptable risk (LAR) between 0.35 and 0.65. Practical value. It has been shown an implementation practicability of using this methodology by contracting companies at decision-making stage for construction projects initiation with determinate indicators of duration Td and cost Cd. The creation of theoretical and methodological foundations for the development of structural efficiency evaluation algorithms for the organisation of construction production will allow to achieve for contractor companies the highest level of competitiveness in the market of construction services.
Book chapters on the topic "C-ITS services simulation"
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Kaiwartya, Omprakash, Pawan Kumar Tiwari, Sushil Kumar, and Mukesh Prasad. "Dynamic Vehicle Routing Solution in the Framework of Nature-Inspired Algorithms." In Designing and Implementing Global Supply Chain Management, 36–50. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-9720-1.ch003.
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Vehicle Routing Problem (VRP), a well-known combinatorial optimization problem had been presented by Dantzing and Hamser in 1959. The problem has taken its inspiration from the transport field. In real field environment, a lot of variants of the problem exist that actually belongs to the class of NP-hard problem. Dynamic Vehicle routing problem (DVRP) is one of the variant of VRP that varies with respect to time. In DVRP, new customer orders appear over time and new route must be reconfigured at any instantaneous time. Although, some exact algorithms such as dynamic programming methods, branch and bound etc. can be applied to find the optimal route of a smaller size VRP. But, These Algorithms fail to give the solution of existed model of VRP in real field environment under given real time constraints. Courier services, dial a ride services and express mail delivery etc. are the few examples of real field environment problems that can be formulated in the form of DVRP. In this chapter, A novel variants of DVRP named as DVRP with geographic ranking (DVRP-GR) has been proposed. In DVRP-GR, geographical ranking, customer ranking, service time, expected reachability time, customer satisfaction level have been optimized. A solution of DVRP-GR using seed based particle swarm optimization (S-DVRS-PSO) has been also proposed. The simulations have been performed using customized simulator developed in C++ environment. The data sets used in the simulations are OMK-01, OMK-02 and OMK-03 generated in real vehicular environment. The solution of the proposed algorithm has been compared with the randomized solution technique. Analysis of the simulation results confirms the effectiveness of the proposed solution in terms of various parameters considered viz. number of vehicles, expected reachability time, profit and customer satisfaction.
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Viti, Francesco, Marco Rinaldi, and Georgios Laskaris. "Optimal Management of Electrified and Cooperative Bus Systems." In Transportation Systems for Smart, Sustainable, Inclusive and Secure Cities [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.93892.
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This chapter presents an integrated management approach exploiting the potentials of the new Cooperative Intelligent Transportation Systems (C-ITS) to meet the requirements of the next generation Public Transport (PT). This approach considers the additional complexity of electrification—for instance electric busses need to periodically recharge during operation using dedicated infrastructure. This not only can impact service level, but also extend operating costs with complex electric charges. We develop new strategies explicitly optimizing the interactions within the PT ecosystem consisting of vehicles, traffic signals, and e-bus charging infrastructure. To achieve these goals, we rely on vehicle control rather than on the use of transit signal priority, which in congested urban scenarios can have negative effects on overall traffic performance. The main research challenges are in formulating and solving complex multi-objective optimization problems and real-time control. The proposed system is tested and evaluated in simulation showing the benefits of electrified and cooperative bus systems.
Conference papers on the topic "C-ITS services simulation"
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Acheampong, Samuel, William Ampomah, Jiawei Tu, Robert Balch, Matt Eales, Robert Trentham, Richard Esser, Candace Cady, Martha Cather, and El-Kaseeh George. "Development of Site Characterization and Numerical Modeling Workflow of Acid Gas Injection for MRV-45Q Application." In SPE Improved Oil Recovery Conference. SPE, 2022. http://dx.doi.org/10.2118/209416-ms.
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Abstract As part of the project funded under the Carbon Utilization and Storage Partnership (CUSP) of the Western United States, this paper demonstrates a workflow including site characterization and numerical simulation efforts of proposing a Monitoring, Reporting, and Verification (MRV) plan to the U.S. Environmental Protection Agency (EPA) for approval according to 40 CFR 98.440 (c)(1), Subpart RR of the Greenhouse Gas Reporting Program (GHGRP) to qualify for the tax credit in section 45Q of the federal Internal Revenue Services (IRS) Code. In this project, the injectors and treated acid gas (TAG) plant are located at the northern margin of the Delaware Basin, a highly productive hydrocarbon basin in southeastern New Mexico. The target injection zones are the Permian-aged Cherry Canyon Formation for the acid gas injection (AGI) #1 well and Siluro-Devonian formations for the AGI #2 well, storage zones above and beneath active hydrocarbon pay zones respectively. The storage zones and caprocks are characterized through well log examinations, formation fluid chemistry evaluation, faults identification and interpretation. Reservoir models were constructed and simulation performed to predict the extent of the TAG plume after 30 years of injection with 5 years of post-injection site care monitoring. The reservoir mapping and cross sections interpreted from well logs indicate that the area around AGI #1 does not contain visible faulting or offsets that might influence fluid migration, suggesting that injected fluid would spread radially from the point of injection with a small elliptical component to the south. In the Siluro-Devonian formation, where AGI #2 is planned to be completed. The induced-seismicity risk assessment shows that the operation of the proposed injection combined with the historic volume contributions of the regional saltwater disposal (SWD) wells is not anticipated to contribute significantly to injection-induced fault slip. This result demonstrates that acid gas can be injected as proposed while maintaining the minimal risk of induced seismicity. The water sample collected from a nearby well indicates that the formation waters are highly saline (180,000 ppm NaCl) and compatible with the proposed injection. The reservoir simulation results indicate that the TAG plume is predicted to extend a maximum of 1.2 km from the injector wellbore when the identified faults are treated as non-transmissive and 0.90 km when they are treated as transmissive. The pressure profiles demonstrate the strong potential for safe injection into both target formations. In December 2021, the United States Environmental Protection Agency (EPA) approved the Monitoring, Reporting, and Verification (MRV) plan, permitting Lucid Energy to sequester acid gas from its Red Hills gas processing complex in Lea County, New Mexico. This paper provides the industry with a critical roadmap for converting existing injectors into CO2 or TAG sequestration wells that may qualify for 45Q tax certification to comply with the current administrative regulations. As part of the project funded by Carbon Utilization and Storage Partnership (CUSP) of the Western United States, published data from this project is invaluable.
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Poole, W. J., M. Militzer, F. Fazeli, M. Maalekian, C. Penniston, and D. Taylor. "Microstructure Evolution in the HAZ of Girth Welds in Linepipe Steels for the Arctic." In 2010 8th International Pipeline Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ipc2010-31155.
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A critical aspect of building pipelines to transport natural gas will be development of suitable high strength steels and new economic welding procedures, e.g. dual torch welding, without compromising the pipeline’s structural integrity during its in-service performance. The objective of this project is to predict the microstructure and mechanical properties of the weld heat affected zone (HAZ) of an X80 linepipe steel as a function of its temperature-time history. The approach taken involves a combination of experimental techniques and advanced modelling approaches. On the experimental side, dual-torch weld trials for assessment of spatial and temporal variations of temperature in the HAZ were conducted. To simulate and investigate the microstructure evolutions in the HAZ, i.e. precipitate dissolution, austenite formation, grain growth and decompositions, Gleeble thermo-mechanical simulations were performed. These simulations include rapid heating and cooling tests at rates of up to 1000 °C/s. Notably, real-time monitoring of austenite grain growth was possible by using a novel laser ultrasonic technique. Further, bulk samples were produced using the Gleeble adopting the experimentally determined temperature time history. These bulk specimens were subsequently subjected to tensile and fracture resistance tests. A concise overview of these novel experimental activities, highlighting new insights, is presented and challenges associated with the measurements are discussed.
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Li, You, Zhiping Chen, and Hongfei Li. "Application of Different Data-Driven Methods in Material Performance Prediction of 2.25Cr-1Mo-0.25V Steel After Forming and Tempering." In ASME 2021 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/pvp2021-61529.
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Abstract 2.25Cr-1Mo-0.25V steel is the main material of hydrogenation reactor due to its good high temperature properties and hydrogen embrittlement resistance. As we all know, there is a great performance gap between virgin material and actual product. Nevertheless, current design methods cannot evaluate the impact of manufacturing. In engineering practice, tensile testing is widely implemented on online surveillance samples or experimentally simulated samples to acquire the actual material characteristics. However, sampling from service hydrogenation reactor, as well as simulating actual manufacturing process, is time-consuming, labor-intensive, and difficult. To systematically analyze the effect of fabrication on 2.25Cr-1Mo-0.25V steel, a prediction method that can consider manufacturing residual effects needs to be proposed. Nowadays, many data-driven methods, such as back propagation neural network (BPNN), support vector machine (SVM) and random forest (RF), are employed in predicting material behavior during hot forming, whereas they are scarcely applied on 2.25Cr-1Mo-0.25V steel. In this work, the mentioned three machine learning procedures were constructed to simulate the behavior of actually manufactured 2.25Cr-1Mo-0.25V steel in uniaxial tensile test. Firstly, tensile samples were extracted from different locations of an actually manufactured hydrogenation reactor, and stretched at 454 °C and 482 °C. Subsequently, BPNN, SVM and RF models were developed on the obtained tensile curves, respectively. Their inputs were manufacturing parameter, sampling location, service temperature and tensile strain, whereas their output was tensile stress. Finally, the predictability of models was evaluated by test set data which were not involved in model training process. The results show that the predictions of BPNN, SVM and RF all agree well with experimental data. BPNN exhibits lowest prediction error and highest generalization power, SVM is somewhere in between, while RF is the worst. This work will contribute to the application of data-driven methods in material property prediction of 2.25Cr-1Mo-0.25V steel.
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Heyn, Toby, Andrew Seidl, Hammad Mazhar, David Lamb, Alessandro Tasora, and Dan Negrut. "Enabling Computational Dynamics in Distributed Computing Environments Using a Heterogeneous Computing Template." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48347.
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This paper describes a software infrastructure made up of tools and libraries designed to assist developers in implementing computational dynamics applications running on heterogeneous and distributed computing environments. Together, these tools and libraries compose a so called Heterogeneous Computing Template (HCT). The heterogeneous and distributed computing hardware infrastructure is assumed herein to be made up of a combination of CPUs and GPUs. The computational dynamics applications targeted to execute on such a hardware topology include many-body dynamics, smoothed-particle hydrodynamics (SPH) fluid simulation, and fluid-solid interaction analysis. The underlying theme of the solution approach embraced by HCT is that of partitioning the domain of interest into a number of sub-domains that are each managed by a separate core/accelerator (CPU/GPU) pair. Five components at the core of HCT enable the envisioned distributed computing approach to large-scale dynamical system simulation: (a) a method for the geometric domain decomposition and mapping onto heterogeneous hardware; (b) methods for proximity computation or collision detection; (c) support for moving data among the corresponding hardware as elements move from subdomain to subdomain; (d) numerical methods for solving the specific dynamics problem of interest; and (e) tools for performing visualization and post-processing in a distributed manner. In this contribution the components (a) and (c) of the HCT are demonstrated via the example of the Discrete Element Method (DEM) for rigid body dynamics with friction and contact. The collision detection task required in frictional-contact dynamics; i.e., task (b) above, is discussed separately and in the context of GPU computing. This task is shown to benefit of a two order of magnitude gain in efficiency when compared to traditional sequential implementations. Note: Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not imply its endorsement, recommendation, or favoring by the US Army. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Army, and shall not be used for advertising or product endorsement purposes.
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Marshall, Michael, Meysam Akbari, Ji-Cheng Zhao, and Kevin Hoopes. "Design of an Additively Manufactured Recuperator With 800 °C Inlet Temperature for sCO2 Power Cycle Application." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-82301.
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Abstract Recuperators with design temperatures at and above 800 °C can further increase the thermal efficiency of supercritical CO2 power cycles by enabling higher turbine exhaust temperatures. Mar-M247 is a well-suited nickel-based superalloy for high temperature service due to its high creep strength that prevents excessive material thickness being required for pressure containment. While not compatible with the diffusion bonding process due to its low ductility, additive manufacturing using a high-speed laser directed energy deposition (DED) process presents a promising solution with the ability to produce non-conventional flow channels for enhanced heat transfer. A design process is presented that includes aerothermal and mechanical evaluation to maximize performance within the constraints of the manufacturing process. The conceptual design stage evaluates the feasibility of numerous heat transfer concepts from a unit cell perspective. A 2-D heat transfer network and pressure drop code allows prediction of flow distribution in each passage and its effect on overall thermal performance. Established literature correlations, along with CFD simulation, inform the prediction of heat transfer coefficients and friction factors for the flowpaths and enhancement features in the heat exchanger core. Sizing codes for the heat exchanger distribute wall thicknesses for pressure containment according to creep life data for Mar-M247. Mechanical evaluation using FEA modeling with the intent of the ASME BPVC Section VIII, Div 2 assesses the operational safety of the design. The capabilities of the laser DED process and the build strategy for minimizing total build time is discussed, along with the results of build trials that evaluate the settings of the powder nozzle and laser and their effect on deposition rate and susceptibility to build defects. Major considerations affecting the core geometry include the overhang angle of passage structures and the alignment of enhancement features for time efficient builds. The presented detailed design features annular finned passages that take advantage of helical flow paths to distribute the flow from separated headers to shared heat transfer surfaces. Performance predictions for the recuperator at a 50 kW scale provide insights on the feasibility of the AM process to produce recuperators on a commercial scale that extend existing operating envelopes.
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He, Xinxing, Kelin Wang, Wei Fan, Hongtao Liu, Yan Long, Junfeng Xie, Anqing Fu, Peng Deng, and Tianhong Jiang. "A Story of Material Selection For Completion Tubing in HPHT Gas Fields in the Past 20 Years, Western China." In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21416-ms.
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Abstract Kuqa foreland basin, which is located in the western of China, has the characteristics of HPHT with high CO2 partial pressure, and covered Yaha, Kela, Dina, Dabei, and Keshen gas fields. This story dated back to 2000 year that Yaha gas field was put into production, and the reservoir temperature 140°C, pressure 56 MPa, depth 4900-5300 m, and CO2 concentration 0.7-1.3 %. Carbon steel was selected for tubing material in the early stage of field development. After about 3 years, tubing perforation was caused by serious corrosion. Then carbon steel wasupgrade to 13Cr. However, it was found that there was serious corrosion in the connection part of tubing, and the corrosion was caused by the CO2 and condensate water. Based on the experience in Yaha gas field, the modified 13Cr tubing was used in the Dina2 gas fields, and the reservoir temperature 140C, pressure 110 MPa, depth 5200 m, and CO2 concentration 0.26-1.02 %. Although the well condition is less harsh, serious corrosion still occurred concentratedly on tubing pin end. Considering premium tubing leak in Dina field happened during acidification operations, and the results of series simulation tests conducted, the understandings were achieved that acid will cause serious corrosion to the inner wall of tubing, aslocal corrosion is dominant factor of stainless steel. The super 13Cr material was used in Keshen gas field which has reservoir temperature 150-188C, pressure 105-136 MPa, depth 6000-8038 m, and CO2 concentration 0.1-1.1 %. However, tubing fracture happened one by one, which originate from stress corrosion cracking caused by mixture of phosphate packer fluid and killing mud. Therefore, material selection needs to considerthe compatibility of different fluids, and formate was chosen as packer fluid. By December 2020,it has been used in 103 wells of Kuqa foreland basin, abnormal annular pressure is presented in 6 Wells, and the longest service time is six years. As the rapid exploration and development of Kuqa foreland basin, the proper material selection become more difficult for gas reservoir temperature more than 190C and its pressure greater than 140 MPa, the past practices about material selection may provide the reference, and the story about material selection will be continued.
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Mermertas, Ümit, Thomas Hagemann, and Clément Brichart. "Optimization of a 900 mm Tilting-Pad Journal Bearing in Large Steam Turbines by Advanced Modeling and Validation." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76766.
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Modernization of steam turbine components can extend the life of a power plant, decrease maintenance costs, increase service intervals and improve operational flexibility. However, this can also lead to challenging demands for existing components such as bearings, e.g., due to increased rotor weights. Therefore, a careful design and evaluation process of bearings is of major importance. This paper describes the advanced modeling methods applied for the optimization of a novel 900 mm three-pad tilting pad journal bearing followed by validation results that showed a high bearing temperature sensitivity to the fresh oil supply temperature during operation. The bearing was especially developed to cope with increased rotor weights within the framework of low pressure steam turbine modernizations at two similar 1000 MW nuclear power plants. With a static bearing load of approximately 2.7 MN at a rotor speed of 1500 rpm, it represents one of the highest loaded applications for tilting pad journal bearings in turbomachinery worldwide. After identification of the reasons for the sensitivity, advanced modeling methods were applied to optimize the bearing. For this purpose, a more comprehensive bearing model was developed taking into account the direct lubrication at the leading edge of the pads and the thermo-mechanical pad deformation. For the latter, a co-simulation between the bearing computation code and structural mechanics software was performed. The results of the entire analyses indicated modifications of bearing and pad clearance, pad pivot position, circumferential and axial pad length as well as pad thickness. Furthermore, the oil distribution into the pads was optimized by modifying the orifices within the bearing. The optimized bearing was then implemented on both units and proved its excellent operational behavior at increased fresh oil supply temperatures of up to 55°C. In addition, inspections during scheduled outages after 18 months of operation and subsequent restarts with reproducible bearing behavior confirmed the robustness of the optimized bearing. In conclusion, the application of advanced modeling methods proved to be the key success factor in the optimization of this bearing, which represents an optimal solution for large steam turbine and generator rotor train applications.
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Pervak, V. E. "РОЛЬ ИГРОПРАКТИКИ КАК ПСИХОЛОГИЧЕСКОГО ИНСТРУМЕНТА В КОНСУЛЬТИРОВАНИИ СПЕЦИЛИСТА (НА ПРИМЕРЕ ИГРОТРЕНИНГА ИроКом)." In ПЕРВЫЙ МЕЖКОНТИНЕНТАЛЬНЫЙ ЭКСТЕРРИТОРИАЛЬНЫЙ КОНГРЕСС «ПЛАНЕТА ПСИХОТЕРАПИИ 2022: ДЕТИ. СЕМЬЯ. ОБЩЕСТВО. БУДУЩЕЕ». Crossref, 2022. http://dx.doi.org/10.54775/ppl.2022.47.34.001.
Full textAbstract:
The present time in the midst of the current situation in the world, many professions are experiencing physical and psychological changes. Game practice also goes through its own psychological path of development, because it has been introduced into our lives as an effective psychological method of helping the people through various transformational board and online games. The psychological game "IgroCom" (authors: V. Pervak, M. Kovaleva, E. Danko, A. Muravyeva) is a simulator to train specialists in the field of game practice under the development program "Game practice for specialists of helping professions". It includes modern therapeutic and transformational gaming technologies that improve the quality of services and qualified assistance to the people. The 179 theoretical basis of the game includes the basic concepts: archetypes of C. Jung; stages of effective communication according to M. Forverg; coaching; resource psychology. The basic principles of coaching are orientation to the goal, future, result; directed questions in the game as a technique for modeling the future; search for the best strategies and solutions. The task for the specialist through the transformational game "IgroCom" is to help the participants of game training to realize what internal resources are necessary to achieve the goal; to find out which archetype is the most resourceful for the client, and what it can give them; to restore the participant's current state, to improve communication and negotiation skills; to explore the situation and to feel like to be a part of the team; to realize how this game reflects the events of life and what resource it gives. The game invites you to an exciting journey for the effective communication and resources. The motto of the game is The Fire of Life wants you to start the way! На современном этапе, в разгар сложившейся ситуации в мире, многие профессии переживают физические и психологические изменения. Игропрактика также проходит свой собственный психологический путь развития и устойчиво внедрилась в нашу жизнь как эффективный психологический метод помощи клиентам через трансформационные настольные и онлайн-игры. Психологическая игра "ИгроКом" (авторы: В. Первак, М. Ковалева, Е. Данько, А. Муравьева) является тренажером для обучения специалистов в сфере игропрактики по программе повышения кввалификации «Игропрактика для специалистов помогающих профессий». Она включает в себя современные терапевтические и трансформационные игровые технологии, позволяющие повысить качество оказания услуг и квалифицированной помощи населению. Теоретическая основа игры включает в себя основные концепции: архетипы К. Юнга; этапы эффективного общения по М. Форвергу; коучинг; ресурсную психологию. Основные принципы коучинга: ориентация на цель, будущее, результат; направленные вопросы в игре как техника моделирования будущего; поиск наилучших стратегий и решений. Задача специалиста через трансформационную игру «ИгроКом» помочь участникам игротренинга: осознать, какие внутренние ресурсы необходимы для достижения поставленной цели; выяснить, какой архетип самый ресурсный для клиента в данной ситуации, и что он может дать; восстановить текущее состояние участника; совершенствовать навыки общения, ведения переговоров; исследовать ситуацию и почувствовать себя частью команды; осознать, как эта игра отражает события жизни и какой ресурс это даёт. Игротренинг «ИгроКом» приглашает в увлекательное путешествие в горы за эффективным общением и ресурсами. Девиз игры: «Огонь Жизни» зовёт тебя в путь!