Готові списки джерел за темами / Realizability issue

Добірка наукової літератури з теми "Realizability issue"

Автор: Grafiati

Опубліковано: 14 березня 2023

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Статті в журналах з теми "Realizability issue"

Wu, Hongyu, Qiaozhu Zhai, Xiaohong Guan, Feng Gao, and Hongxing Ye. "Security-Constrained Unit Commitment Based on a Realizable Energy Delivery Formulation." Mathematical Problems in Engineering 2012 (2012): 1–22. http://dx.doi.org/10.1155/2012/178193.

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Security-constrained unit commitment (SCUC) is an important tool for independent system operators in the day-ahead electric power market. A serious issue arises that the energy realizability of the staircase generation schedules obtained in traditional SCUC cannot be guaranteed. This paper focuses on addressing this issue, and the basic idea is to formulate the power output of thermal units as piecewise-linear function. All individual unit constraints and systemwide constraints are then reformulated. The new SCUC formulation is solved within the Lagrangian relaxation (LR) framework, in which a double dynamic programming method is developed to solve individual unit subproblems. Numerical testing is performed for a 6-bus system and an IEEE 118-bus system on Microsoft Visual C# .NET platform. It is shown that the energy realizability of generation schedules obtained from the new formulation is guaranteed. Comparative case study is conducted between LR and mixed integer linear programming (MILP) in solving the new formulation. Numerical results show that the near-optimal solution can be obtained efficiently by the proposed LR-based method.

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Chuong, Vu, Truong, and Jung. "A Novel Design of Fractional PI/PID Controllers for Two-Input-Two-Output Processes." Applied Sciences 9, no. 23 (December 3, 2019): 5262. http://dx.doi.org/10.3390/app9235262.

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In this paper, a new formulation of fractional order proportional integral (PI)/ proportional integral derivative (PID) controller is proposed. The proposed controller will be justified for some well-known two-input-two-output (TITO) processes. In order to deal with interactions between process variables in a multivariable system, as well as multiple delay times in process transfer functions, the simplified decoupling Smith predictor (SDSP) structure is also used. The issue of decoupling realizability is solved by the PSO algorithm and fractional order processes are also suggested for model reduction. The tuning rules of the controller are derived in analytical terms based on the internal model control (IMC) structure. The effectiveness and robust stability of the proposed approach are illustrated by comparing it with other methods. To have a fair comparison, the robustness criterion using the M-Δ structure with μ-synthesis is adopted and the μ value of the proposed method is always kept smaller than the value of the others.

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Tabatabaei, Narges, Ramis Örlü, Ricardo Vinuesa, and Philipp Schlatter. "Aerodynamic Free-Flight Conditions in Wind Tunnel Modelling through Reduced-Order Wall Inserts." Fluids 6, no. 8 (July 27, 2021): 265. http://dx.doi.org/10.3390/fluids6080265.

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Parallel sidewalls are the standard bounding walls in wind tunnels when making a wind tunnel model for free-flight condition. The consequence of confinement in wind tunnel tests, known as wall-interference, is one of the main sources of uncertainty in experimental aerodynamics, limiting the realizability of free-flight conditions. Although this has been an issue when designing transonic wind tunnels and/or in cases with large blockage ratios, even subsonic wind tunnels at low-blockage-ratios might require wall corrections if a good representation of free-flight conditions is intended. In order to avoid the cumbersome streamlining methods especially for subsonic wind tunnels, a sensitivity analysis is conducted in order to investigate the effect of inclined sidewalls as a reduced-order wall insert in the airfoil plane. This problem is investigated via Reynolds-averaged Navier–Stokes (RANS) simulations, and a NACA4412 wing at the angles of attack between 0 and 11 degrees at a moderate Reynolds number (400 k) is considered. The simulations are validated with well-resolved large-eddy simulation (LES) results and experimental wind tunnel data. Firstly, the wall-interference contribution in aerodynamic forces, as well as the local pressure coefficients, are assessed. Furthermore, the isolated effect of confinement is analyzed independent of the boundary-layer growth. Secondly, wall-alignment is modified as a calibration parameter in order to reduce wall-interference based on the aforementioned assessment. In the outlined method, we propose the use of linear inserts to account for the effect of wind tunnel walls, which are experimentally simple to realize. The use of these inserts in subsonic wind tunnels with moderate blockage ratio leads to very good agreement between free-flight and wind tunnel data, while this approach benefits from simple manufacturing and experimental realization.

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Stillinger *, Frank H., and Salvatore Torquato. "Realizability issues for iso-g(2)processes." Molecular Physics 103, no. 21-23 (November 10, 2005): 2943–49. http://dx.doi.org/10.1080/00268970500151528.

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Veremey, E. I., V. V. Eremeev, N. A. Zhabko, and S. V. Pogozhev. "Degenerate problems of H-optimization for SISO LTI systems and realizability issues." Automation and Remote Control 76, no. 6 (June 2015): 1094–100. http://dx.doi.org/10.1134/s0005117915060132.

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Werg, Jana Lorena, Torsten Grothmann, and Stefan Löchtefeld. "Fostering Self-Protection against Impacts of Heavy Rain at the Municipal Level." Sustainability 13, no. 13 (June 22, 2021): 7019. http://dx.doi.org/10.3390/su13137019.

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Local governments are highly relevant actors when it comes to mitigating climate change impacts such as flooding. Not only do they need to implement regulatory and infrastructural measures, but they also need to promote complementing self-protective measures at the household level. The individual motivation of municipal actors to pursue climate adaptation can be important for the implementation of such measures, obviously alongside several other factors, such as financial and administrative issues. A questionnaire survey with a non-random sample of 77 local government actors from 15 of the 16 German federal states was conducted, focusing on potential key factors concerning the motivation to implement adaptation measures against hazardous impacts of heavy rain. Additionally, the perceived effectiveness and realizability of selected municipal structural measures and of activation measures promoting self-protective behavior were collected. It can be shown that the perceived realizability of adaptation measures as well as knowledge of risk and adaptation may be key factors in the motivation to implement both activation and structural measures, while motivation and implementation are only partially related. The results imply a need for the evaluation of activation measures and a need for further research on the motivation of municipal actors to implement activation measures.

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Rediniotis, Othon K., Jeonghwan Ko, and Andrew J. Kurdila. "Reduced Order Nonlinear Navier-Stokes Models for Synthetic Jets." Journal of Fluids Engineering 124, no. 2 (May 28, 2002): 433–43. http://dx.doi.org/10.1115/1.1467598.

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While the potential for the use of synthetic jet actuators to achieve flow control has been noted for some time, most of such flow control studies have been empirical or experimental in nature. Several technical issues must be resolved to achieve rigorous, model-based, closed-loop control methodologies for this class of actuators. The goal of this paper is consequently two-fold. First, we seek to derive and evaluate model order reduction methods based on proper orthogonal decomposition that are suitable for synthetic jet actuators. Second, we seek to derive rigorously stable feedback control laws for the derived reduced order models. The realizability of the control strategies is discussed, and a numerical study of the effectiveness of the reduced order models for two-dimensional flow near the jet exit is summarized.

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Chuong, Vu, Truong, and Jung. "An Analytical Design of Simplified Decoupling Smith Predictors for Multivariable Processes." Applied Sciences 9, no. 12 (June 18, 2019): 2487. http://dx.doi.org/10.3390/app9122487.

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In this study, the issues of complicated interactions between process variables were solved by decoupling techniques; in particular, simplified decoupling was used due to its simplicity and robustness. A new approach to solving decoupling realizability was developed by using the modified particle swarm optimization (PSO) algorithm. However, time delays still existed in the diagonal elements of the decoupled matrix, and they resulted in a more sophisticated controller design and sluggish responses in the outputs. To overcome the adverse effects of time delays, a Smith predictor, also known as a dead time compensator, is normally used. In this work, a Smith predictor structure in combination with simplified decoupling for multivariable processes was proposed in order to enhance system performances in terms of the servomechanism problem. The proportional integral or proportional integral derivative (PI/PID) controller tuning rules for several common industrial processes, such as first-order, second-order, and second-order with negative zero systems, were obtained. Many multivariable industrial processes were adopted to simulate the effectiveness of the proposed method in terms of the servomechanism problem and robust response.

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Filenko, I. A., I. V. Atamanova, and S. A. Bogomaz. "Examining the Psychometric Characteristics of the Subjective Evaluation of Basic Values Realizability (SEBVR) Technique Designed for Value Orientation Studies." Bulletin of Kemerovo State University 22, no. 4 (January 5, 2021): 1028–39. http://dx.doi.org/10.21603/2078-8975-2020-22-4-1028-1039.

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The article addresses the issues associated with increasing the reliability of research tools for value orientation studies. Despite the high demand, their methodology requires qualitative improvement. The research objective was to determine the psychometric characteristics of the Subjective Evaluation of Basic Values Realizability (SEBVR) technique. The study was based on the SEBVR technique and the Portrait Values Questionnaire-Revised (PVQ-R) by Schwartz. The data processing included factor analysis, correlation analysis, reliability analysis, the Kolmogorov-Smirnov test, and the Mann-Whitney U-test. The analysis involved 1,415 respondents aged 17–29. The authors clarified the factor structure of the SEBVR technique as represented by four scales. They evaluated the reliability characteristics of the internal consistency of the scales, their construct validity, and descriptive statistics for the main SEBVR indicators. The technique proved efficient in identifying differences between male and female respondents. According to its psychometric characteristics, the SEBVR technique appeared to be a fairly reliable research tool, which makes it possible to expand the possibilities of its use in applied research related to exploring young adults’ value orientations in the age group of 17–29 years.

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Дисертації з теми "Realizability issue"

SHIEA, MOHSEN. "Simulation of polydisperse bubbly flows: An investigation on physical and numerical aspects." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2823958.

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Частини книг з теми "Realizability issue"

Miłkowski, Marcin. "Computation and Multiple Realizability." In Fundamental Issues of Artificial Intelligence, 29–41. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26485-1_3.

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Тези доповідей конференцій з теми "Realizability issue"

Yilmaz, A. Egemen, and Ziya Telatar. "Musical harmonization with words: Realizability, potential issues and challenges." In 2009 Fifth International Conference on Soft Computing, Computing with Words and Perceptions in System Analysis, Decision and Control (ICSCCW). IEEE, 2009. http://dx.doi.org/10.1109/icsccw.2009.5379489.

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Virk, Gurjiwan, Manvinder Singh, Vijay Jain, and P. V. M. Rao. "Conceptual Design of a Carbon Nanotube Based Gearbox." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34738.

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Gears, bearings, springs, fasteners etc. are some typical machine elements used to build machines and mechanical systems. These elements are used for performing one or more of functions such as, to transmit motion, to support moving members, to store energy, to join two components etc. The continuous miniaturization and the need for mechanical systems having sizes of a few nanometers have led to new but challenging issues in design and manufacturing of these machine elements. Carbon nanotubes have a potential to be used as machine elements in multiple roles for building mechanical systems at a nano level. This paper explores the use of single-walled and multi-walled carbon nanotubes in building a nano-mechanical system such as gearbox. The paper presents a conceptual design of a gearbox completely made of carbon nano tubes and discusses its feasibility and realizability. The paper also discusses future directions of research in building nanomachines and nano-mechanical systems using carbon nanotube based machine elements.

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Shimomura, Yoshiki, Hideaki Takeda, Masaharu Yoshioka, Yasushi Umeda, and Tetsuo Tomiyama. "Representation of Design Object Based on the Functional Evolution Process Model." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0170.

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Abstract One of the crucial issues for developing computer aided conceptual design system is representation of functions which represent designers’ intention. Representing functions is also crucial not only for representing design objects but also for describing conceptual design processes, in which designers operate mainly functional concepts. Namely, function is a key concept to integrate object modeling and process modeling in design. In this paper, first we extend the FBS (Function-Behavior-State) diagram, which we have already proposed, by introducing three additional concepts for representing a function; namely, function body that represents designers’ intention directly, function modifier that qualifies a function body, and objective entity on which the function body occurs. This extended FBS diagram, called FBS/m (modifier) diagram, enables us to represent designers’ intention more precisely than the original FBS diagram. Then, we propose an FEP (Functional Evolution Process) model to represent design processes. In the FEP model, the FBS model of a design object is evolved through three steps, i.e., functional actualization, functional evaluation and functional operation. Functional actualization depicts a process to obtain physical descriptions from functional description. Functional evaluation is a process to measure realizability of functions of the design object. Functional operation is a process to operate functions to improve the design. Based on the FEP model, we analyze some actual design processes, and show that the FEP model is suitable for representing designers’ intention along with design processes.

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