Relevant bibliographies by topics / Coefficients of engineering solutions efficiency

Academic literature on the topic 'Coefficients of engineering solutions efficiency'

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Published: 30 May 2022

Last updated: 31 May 2022

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Journal articles on the topic "Coefficients of engineering solutions efficiency"

Dong, Guirong, Chengyang Liu, Yijie Liu, Ling Wu, Xiaoan Mao, and Dianzi Liu. "Computationally Efficient Approximations Using Adaptive Weighting Coefficients for Solving Structural Optimization Problems." Mathematical Problems in Engineering 2021 (March 10, 2021): 1–12. http://dx.doi.org/10.1155/2021/1743673.

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With rapid development of advanced manufacturing technologies and high demands for innovative lightweight constructions to mitigate the environmental and economic impacts, design optimization has attracted increasing attention in many engineering subjects, such as civil, structural, aerospace, automotive, and energy engineering. For nonconvex nonlinear constrained optimization problems with continuous variables, evaluations of the fitness and constraint functions by means of finite element simulations can be extremely expensive. To address this problem by algorithms with sufficient accuracy as well as less computational cost, an extended multipoint approximation method (EMAM) and an adaptive weighting-coefficient strategy are proposed to efficiently seek the optimum by the integration of metamodels with sequential quadratic programming (SQP). The developed EMAM stems from the principle of the polynomial approximation and assimilates the advantages of Taylor’s expansion for improving the suboptimal continuous solution. Results demonstrate the superiority of the proposed EMAM over other evolutionary algorithms (e.g., particle swarm optimization technique, firefly algorithm, genetic algorithm, metaheuristic methods, and other metamodeling techniques) in terms of the computational efficiency and accuracy by four well-established engineering problems. The developed EMAM reduces the number of simulations during the design phase and provides wealth of information for designers to effectively tailor the parameters for optimal solutions with computational efficiency in the simulation-based engineering optimization problems.

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Navickas, Zenonas, Tadas Telksnys, Romas Marcinkevicius, Maosen Cao, and Minvydas Ragulskis. "F-Operators for the Construction of Closed Form Solutions to Linear Homogenous PDEs with Variable Coefficients." Mathematics 9, no. 9 (April 21, 2021): 918. http://dx.doi.org/10.3390/math9090918.

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A computational framework for the construction of solutions to linear homogenous partial differential equations (PDEs) with variable coefficients is developed in this paper. The considered class of PDEs reads: ∂p∂t−∑j=0m∑r=0njajrtxr∂jp∂xj=0 F-operators are introduced and used to transform the original PDE into the image PDE. Factorization of the solution into rational and exponential parts enables us to construct analytic solutions without direct integrations. A number of computational examples are used to demonstrate the efficiency of the proposed scheme.

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Mardani, A., M. R. Hooshmandasl, M. M. Hosseini, and M. H. Heydari. "Moving Least Squares (MLS) Method for the Nonlinear Hyperbolic Telegraph Equation with Variable Coefficients." International Journal of Computational Methods 14, no. 03 (April 13, 2017): 1750026. http://dx.doi.org/10.1142/s0219876217500268.

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Telegraph equation which widely used for modeling many engineering and physical phenomena has considered by some researchers in recent years. In this paper, a numerical scheme based on the moving least squares (MLS) approximation and finite difference method (FDM) is proposed for solving a class of the nonlinear hyperbolic telegraph equation with variable coefficients. In the new developed scheme, we use collocation points and approximate solution of the problem under study by using MLS approximation. The MLS method is a meshless approach and does not need any background mesh structure. A time stepping approach is employed for the first- and second-order time derivatives. The proposed method provides a semi-discrete solutions for the problems under study. In space domain, the MLS approximation and in time domain, the finite difference technique are employed. This method after discretization leads to a linear system of algebraic equations. Some numerical results are given and compared with analytical solutions to demonstrate the validity and efficiency of the proposed technique.

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Batko, Kornelia M., Izabella Ślęzak-Prochazka, Andrzej Ślęzak, Wioletta M. Bajdur, and Maria Włodarczyk-Makuła. "Management of Energy Conversion Processes in Membrane Systems." Energies 15, no. 5 (February 23, 2022): 1661. http://dx.doi.org/10.3390/en15051661.

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The internal energy (U-energy) conversion to free energy (F-energy) and energy dissipation (S-energy) is a basic process that enables the continuity of life on Earth. Here, we present a novel method of evaluating F-energy in a membrane system containing ternary solutions of non-electrolytes based on the Kr version of the Kedem–Katchalsky–Peusner (K–K–P) formalism for concentration polarization conditions. The use of this formalism allows the determination of F-energy based on the production of S-energy and coefficient of the energy conversion efficiency. The K–K–P formalism requires the calculation of the Peusner coefficients Kijr and Kdetr (i, j ∈ {1, 2, 3}, r = A, B), which are necessary to calculate S-energy, the degree of coupling and coefficients of energy conversion efficiency. In turn, the equations for S-energy and coefficients of energy conversion efficiency are used in the F-energy calculations. The Kr form of the Kedem–Katchalsky–Peusner model equations, containing the Peusner coefficients Kijr and Kdetr, enables the analysis of energy conversion in membrane systems and is a useful tool for studying the transport properties of membranes. We showed that osmotic pressure dependences of indicated Peusner coefficients, energy conversion efficiency coefficient, entropy and energy production are nonlinear. These nonlinearities were caused by pseudophase transitions from non-convective to convective states or vice versa. The method presented in the paper can be used to assess F-energy resources. The results can be adapted to various membrane systems used in chemical engineering, environmental engineering or medical applications. It can be used in designing new technologies as a part of process management.

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Karakoç, Seydi Battal Gazi, Aytekin Eryılmaz, and Musa Başbük. "The Approximate Solutions of Fredholm Integrodifferential-Difference Equations with Variable Coefficients via Homotopy Analysis Method." Mathematical Problems in Engineering 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/261645.

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Numerical solutions of linear and nonlinear integrodifferential-difference equations are presented using homotopy analysis method. The aim of the paper is to present an efficient numerical procedure for solving linear and nonlinear integrodifferential-difference equations. The reliability and efficiency of the proposed scheme are demonstrated by some numerical experiments and performed on the computer algebraic system.

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Abbasov, T., and A. R. Bahadir. "The investigation of the transient regimes in the nonlinear systems by the generalized classical method." Mathematical Problems in Engineering 2005, no. 5 (2005): 503–19. http://dx.doi.org/10.1155/mpe.2005.503.

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This paper presents the use of the generalized classical method (GCM) for solving linear and nonlinear differential equations. This method is based on the differential transformation (DT) technique. In the GCM, the solution of the nonlinear transient regimes in the physical processes can be written as a functional series with unknown coefficients. The series can be chosen to satisfy the initial and boundary conditions which represent the properties of the physical process. The unknown coefficients of the series are determined from the differential transformation of the nonlinear differential equation of the system. Therefore, the approximate solution of the nonlinear differential equation can be obtained as a closed-form series.The validity and efficiency of the GCM is shown using some transient regime problems in the electromechanics processes. The numerical results obtained by the present method are compared with the analytical solutions of the equations. It is shown that the results are found to be in good agreement with each other.

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YÜZBAŞI, ŞUAYİP YÜZBAŞI, and MEHMET SEZER. "ON SOLUTIONS OF LINEAR FUNCTIONAL INTEGRAL AND INTEGRO-DIFFERENTIAL EQUATIONS VIA LAGRANGE POLYNOMIALS." Journal of Science and Arts 21, no. 3 (September 30, 2021): 707–20. http://dx.doi.org/10.46939/j.sci.arts-21.3-a11.

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In this study, a matrix-collocation method is developed numerically to solve the linear Fredholm-Volterra-type functional integral and integro-differential equations. The linear functional integro-differential equations are considered under initial conditions. The mentioned type problems often appear in various branches of science and engineering such as physics, biology, mechanics, electronics. The method essentially is a collocation method based on the Lagrange polynomials and matrix operations. By using presented method, the problem is reduced to a system of linear algebraic equations. The solution of this system gives the coefficients of assumed solution. An error analysis based on the residual function is studied. Some examples are solved to demonstrate the accuracy and efficiency of the method.

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Konuralp, Ali, and Sercan Öner. "Numerical Solutions Based on a Collocation Method Combined with Euler Polynomials for Linear Fractional Differential Equations with Delay." International Journal of Nonlinear Sciences and Numerical Simulation 21, no. 6 (October 25, 2020): 539–47. http://dx.doi.org/10.1515/ijnsns-2019-0018.

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AbstractIn this study, a method combined with both Euler polynomials and the collocation method is proposed for solving linear fractional differential equations with delay. The proposed method yields an approximate series solution expressed in the truncated series form in which terms are constituted of unknown coefficients that are to be determined according to Euler polynomials. The matrix method developed for the linear fractional differential equations is improved to the case of having delay terms. Furthermore, while putting the effect of conditions into the algebraic system written in the augmented form in which the coefficients of Euler polynomials are unknowns, the condition matrix scans the rows one by one. Thus, by using our program written in Mathematica there can be obtained more than one semi-analytic solutions that approach to exact solutions. Some numerical examples are given to demonstrate the efficiency of the proposed method.

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Gusu, Daba Meshesha, Dechasa Wegi, Girma Gemechu, and Diriba Gemechu. "Fractional Order Airy’s Type Differential Equations of Its Models Using RDTM." Mathematical Problems in Engineering 2021 (September 10, 2021): 1–21. http://dx.doi.org/10.1155/2021/3719206.

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In this paper, we propose a novel reduced differential transform method (RDTM) to compute analytical and semianalytical approximate solutions of fractional order Airy’s ordinary differential equations and fractional order Airy’s and Airy’s type partial differential equations subjected to certain initial conditions. The performance of the proposed method was analyzed and compared with a convergent series solution form with easily computable coefficients. The behavior of approximated series solutions at different values of fractional order α and its modeling in 2-dimensional and 3-dimensional spaces are compared with exact solutions using MATLAB graphical method analysis. Moreover, the physical and geometrical interpretations of the computed graphs are given in detail within 2- and 3-dimensional spaces. Accordingly, the obtained approximate solutions of fractional order Airy’s ordinary differential equations and fractional order Airy’s and Airy’s type partial differential equations subjected to certain initial conditions exactly fit with exact solutions. Hence, the proposed method reveals reliability, effectiveness, efficiency, and strengthening of computed mathematical results in order to easily solve fractional order Airy’s type differential equations.

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Maczyszyn, Agnieszka. "Energy Loss Coefficients ki in a Displacement Pump and Hydraulic Motor used in Hydrostatic Drives." Polish Maritime Research 26, no. 3 (September 1, 2019): 47–55. http://dx.doi.org/10.2478/pomr-2019-0045.

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Abstract The article aims at defining and analysing the energy loss coefficients in design solutions of rotating displacement machines, with a piston machine as an example. The energy losses observed in these machines include mechanical loss, volumetric loss, and pressure loss. The scale and relations between these losses in different machines depend on machine design and manufacturing quality, and on operating parameters. The operating parameters, in turn, which affect directly or indirectly the above losses depend on whether the machine works in pump or hydraulic motor regime. The article is also a contribution to the development of a library of ki coefficients which define the losses in displacement machines, as the knowledge about these coefficients makes it possible to assess fast and easily the energy efficiency of a machine or drive system at each point of its working area.

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Dissertations / Theses on the topic "Coefficients of engineering solutions efficiency"

Chung, Mi Young 1972. "Activity coefficients of glycylglycine and DL, -aminobutyric acid in electrolyte solutions ar 298.15 K." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32956.

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The activity coefficients of glycylglycine and DL, alpha-aminobutyric acid in four aqueous electrolyte solutions (+NaCI, +NaBr, +KCI and +KBr) were obtained at 298.2K. The mean ionic activity coefficient of the electrolyte in aqueous solutions containing these biomolecules was determined from measurements of the potential differences of a cation and an anion ion-selective-electrodes, each measured versus a double junction reference electrode.
For systems containing glycylglycine, the results show that the nature of the anion has a major effect on the activity coefficients of glycylglycine. Comparison of activity coefficient data for glycylglycine with literature data for glycine, both in aqueous NaCl solutions, indicates that the effect of the electrolyte is larger for the peptide than for the amino acid. For the peptide, in all cases, the effect of the electrolyte is more important at low molalities of the electrolyte. The Wilson equation was used to correlate the activity coefficient data obtained. The correlation results were satisfactory for the region of concentrated electrolyte. For systems of DL, alpha-aminobutyric acid in electrolyte solutions, the cation was found to have a significant effect on the activity coefficients of DL, alpha-aminobutyric acid. There exists a distinctively different tendency of the activity coefficients in the dilute and in the concentrated regions of electrolyte in the presence of DL, alpha-aminobutyric acid.

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Gao, Chongxia 1963. "Activity coefficients of glycine, DL-serine and DL-valine in aqueous solutions containing nitrates at 298.15K." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30244.

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Both an electrochemical and an isopiestic methods were used to measure the mean activity coefficients of amino acids in water-electrolyte-amino acid systems. The electrochemical method used an electrochemical cell with an anion and a cation ion selective electrodes, each measured versus a double junction reference electrode. The activity coefficients of the electrolyte were obtained from the e.m.f measurements for four systems at 298.15K. The amino acids were glycine, DL-serine and DL-valine and the electrolyte were KNO3 and NaNO3. The isopiestic method was applied to measure the activity of water for the system water + DL-serine + KNO3 at 298.15K and the results were compared with those from electrochemical method. The activity coefficients of the amino acids in the ternary systems were obtained from those of the electrolyte measured by the electrochemical method or from those of the water measured by isopiestic method, according to the cross differential relation.
Two models were used to correlate the measured data. First the excess Gibbs free energy model proposed by Khoshkbarchi and Vera (1996a) with the NRTL equation was used to correlate the activity coefficient data. A simple model derived from a modification of a more complex model based on the perturbation theory (Khoshkbarchi and Vera, 1996c) was proposed. The model was applied to correlate the activity coefficients and solubilities of amino acids in binary aqueous solutions and the activity coefficients in ternary systems with satisfactory results.

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Hu, Anqiao. "Green Electronics: High Efficiency On-chip Power Management Solutions for Portable and Battery-Powered Applications." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1291144939.

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Денисов, Микола Олександрович. "Підвищення ефективності незображуючих волоконно- оптичних систем для мінімально інвазивної клінічної медицини." Doctoral thesis, Київ, 2016. https://ela.kpi.ua/handle/123456789/16317.

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Дисертація присвячена вирішенню наукової проблеми підвищення ефективності незображуючих волоконно-оптичних систем (НВОС) для мінімально інвазивної клінічної медицини. Розроблено узагальнені принципи структурно-функціональної організації незображуючих волоконно-оптичних систем для мінімально інвазивної клінічної медицини, в основі яких лежать узагальнені класифікації НВОС та волоконно- оптичного інструменту (ВОІ); оригінальну математичну модель розповсюдження оптичного випромінювання всередині біотанини та математичну модель флуоресцентного сигналу від неї; нові математичні моделі та технічні рішення побудови оригінальних базових функціональних модулів з оцінюванням і оптимізацією їх ефективності за запропонованими кількісними показниками з метою цілеспрямованого створення діагностичних та лікувальних систем і наступним їх впровадженням у виробництво та клінічну практику.

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Akram, Farhan. "Gate driver solutions for high power density SMPS using Silicon Carbide MOSFETs." Thesis, Mittuniversitetet, Institutionen för elektronikkonstruktion, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-41188.

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Discrete silicon carbide (SiC) power devices have unique characteristics that outpace those of silicon (Si) counterparts. The improved physical features have provided better faster switching, greater current densities, lower on-resistance, and temperature performances. However, there is lack of suitable commercial gate drivers that are compatible for high-voltage, and high-speed devices. There has been a great research effort required for the advancement of gate drivers for high voltage SiC transistors. A drive circuit for a SiC MOSFET needs to be optimized in normal operation to give best efficiency and same drive circuit should secure the MOSFET under unsuitable conditions. To ensure the rapid switching of these advanced SiC MOSFETs, a gate driver capable of providing the high current capability is required. In this work, three different high-power-density, high-speed, and high-noise-immunity gate driver modules for 10 kV SiC MOSFET were built and optimized. Double-pulse test was developed for the dynamic characterization of SiC MOSFETs and gate drivers. This setup provided clean measurements of DUT voltage and current under well-defined conditions and correlated to simulation results. Designed gate drivers have thoroughly investigated to test and compare it with our future design. The influential parameters such as dV/dt, dI/dt, and gate driving capability of gate driver were adjusted according to the requirements. The short circuit protection test was performed to check the reliability of driver modules in worst conditions. Furthermore, a DC-DC converter was designed and tested with the advanced gate drivers. The driver modules were tested in designed converter under different load conditions and influential parameters were successfully demonstrated. The driver modules effectively helped in reducing the EMI and switching losses. These designed gate drivers and prototype converter provide all the attractive features and can be widely implemented in industrial applications for energy efficient systems.

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Seyyedhasani, Hasan. "USING THE VEHICLE ROUTING PROBLEM (VRP) TO PROVIDE LOGISTICS SOLUTIONS IN AGRICULTURE." UKnowledge, 2017. https://uknowledge.uky.edu/bae_etds/53.

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Agricultural producers consider utilizing multiple machines to reduce field completion times for improving effective field capacity. Using a number of smaller machines rather than a single big machine also has benefits such as sustainability via less compaction risk, redundancy in the event of an equipment failure, and more flexibility in machinery management. However, machinery management is complicated due to logistics issues. In this work, the allocation and ordering of field paths among a number of available machines have been transformed into a solvable Vehicle Routing Problem (VRP). A basic heuristic algorithm (a modified form of the Clarke-Wright algorithm) and a meta-heuristic algorithm, Tabu Search, were employed to solve the VRP. The solution considered optimization of field completion time as well as improving the field efficiency. Both techniques were evaluated through computer simulations with 2, 3, 5, or 10 vehicles working simultaneously to complete the same operation. Furthermore, the parameters of the VRP were changed into a dynamic, multi-depot representation to enable the re-route of vehicles while the operation is ongoing. The results proved both the Clarke-Wright and Tabu Search algorithms always generated feasible solutions. The Tabu Search solutions outperformed the solutions provided by the Clarke-Wright algorithm. As the number of the vehicles increased, or the field shape became more complex, the Tabu Search generated better results in terms of reducing the field completion times. With 10 vehicles working together in a real-world field, the benefit provided by the Tabu Search over the Modified Clarke-Wright solution was 32% reduction in completion time. In addition, changes in the parameters of the VRP resulted in a Dynamic, Multi-Depot VRP (DMDVRP) to reset the routes allocated to each vehicle even as the operation was in progress. In all the scenarios tested, the DMDVRP was able to produce new optimized routes, but the impact of these routes varied for each scenario. The ability of this optimization procedure to reduce field work times were verified through real-world experiments using three tractors during a rotary mowing operation. The time to complete the field work was reduced by 17.3% and the total operating time for all tractors was reduced by 11.5%. The task of a single large machine was also simulated as a task for 2 or 3 smaller machines through computer simulations. Results revealed up to 11% reduction in completion time using three smaller machines. This time reduction improved the effective field capacity.

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González, Ocón Santiago. "Evaluation of Potentially Eco-Efficient Solutions: Functional Sales and Industrial Ecology." Thesis, Linköping University, Environmental Technique and Management, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-53735.

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Design of products permits to yield goods and services to produce satisfaction on customers, which is measured as value. However, it is at this stage in which most of the environmental impact, from a lifecycle perspective, is added to the product. Eco-design aims at increasing value of products while reducing the burdens on the environment by means conscious design towards efficient use of resources. That efficiency, referred to as eco-efficiency, can be increased in a number of manners within environmental engineering. Traditionally, different fields have tackled materials, energy flows and products from different angles or approaches. In this thesis we describe Functional Sales (FS) and Industrial Ecology (IE) as examples of these. Within this latter, we put emphasis on Industrial Symbiosis (IS) and Eco-effectiveness. We consider these approaches are suitable to work in the framework of eco-design to increase ecoefficiency. By adding services to material products, and managing material and energy flows with a more ecological consciousness, we expect to increase value of products while reducing the impact on the environment.

To analyse this potential improvement, we developed a method involving a new eco-efficiency index (VERI), that recursively intends to ease decisions on possible eco-efficient alternatives. This index and its method are applied to a case study on management of olive oil supply in region of Murcia, Spain. Here, we propose three scenarios that will involve the implementation of FS and IE to compare the outcomes in value and environmental performance against an idealised current supply chain. The results obtained, although not accurate, suggest that FS and EI should be more taken into account in eco-design and, this latter, to also consider holistic viewpoints to find more eco-efficient alternatives for a product development.

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Miller, Timothy Normand. "Architectural Solutions for Low-power, Low-voltage, and Unreliable Silicon Devices." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337612488.

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Luque, Lucio. "Optimisation before growth: New property formations for a resource-efficient use of the existing building stock." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-241145.

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The building industry accounts for around one third of the total energy use and GHG emissions in Sweden. Despite the implementation of energy efficiency measures focusing on new buildings, embodied impacts from material extraction, manufacturing, construction and maintenance have grown in significant proportions. While cities like Stockholm are currently experiencing a strong demographic growth and a high pressure on the supply of new spaces and facilities for new residents, national environmental goals aim to reduce energy use and GHG emissions in the coming decades. For instance, the new Climate Act in Sweden expects the country to become carbon neutral by 2045 and the European Commission urges the decarbonisation of national building stocks by 2050. The dual pressure of growth and environmental targets urges the exploration of alternatives for the supply and use of space. In fact, some sources indicate that many spaces remain unused during several hours a day/week and estimations show that most of the buildings that will be in use in 2050 have already been built today. This study explores the potential for a resource-efficient use of space in the existing building stock in Stockholm, leading to a positive impact on the reduction of energy consumption and GHG emissions. The inquiry is conducted with a mixed methods approach in three sequential steps: the identification of relevant stakeholders, instruments and initiatives; the analysis of use of space in a sample of commercial spaces at the street level; and the formulation of strategies allowing an increase in their temporal and spatial capacity. The study suggests that one way to optimise the use of space in existing buildings is to create new property rights. Specifically, it illustrates how merging commercial spaces on the street level through the constitution of 3D properties can increase the capacity to accommodate activities in space and time. Together with digitalisation and the development of new services based on sharing solutions, this opens up new possibilities for decreasing new construction and to absorb new demands for heated floor area.

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Almeida, Francisco Lima. "Energy Efficiency of Buildings: Solutions to Decrease the Overheating of a School Building." Master's thesis, 2019. https://hdl.handle.net/10216/121180.

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Books on the topic "Coefficients of engineering solutions efficiency"

Commercial Vehicles 2021. VDI Verlag, 2021. http://dx.doi.org/10.51202/9783181023808.

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Contents Ways to achieve Zero Emission ZF E-Mobility products and software for commercial vehicles ..... 1 Thermoelectric generators for heavy-duty vehicles as an economical waste heat recovery system ..... 17 Hybridization of heavy duty trucks – Market analysis and technology for high voltage as well as low voltage solutions ..... 33 Development processes and methods Lightweight construction and cost reduction – a lean, agile MSCDPS® product development process ..... 43 eDrive & Fuel Cell powertrain systems engineering for commercial vehicles ..... 55 Fatigue development of a 10x10 commercial vehicle frame using dynamic and/or strength simulation, virtual iteration and component testing together with measurement data acquisition ..... 73 Data-driven selection of vehicle variants for the E/E integration test – Increasing variants and complex technology versus test coverage ..... 81 Hydrogen propulsion High performance and efficiency hydrogen engine using westport fuel systems’ Commercially available HPDI fuel system ..... 97 E/E architecture and operating strategy for fuel-cell trucks – Challenges...

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Book chapters on the topic "Coefficients of engineering solutions efficiency"

Metkemeyer, R., P. Achard, L. Rouveyre, and D. Picot. "Hydrogen Utilization Efficiency in Pem Fuel Cells." In Hydrogen Power: Theoretical and Engineering Solutions, 581–90. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-015-9054-9_76.

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Vereecken, Willem, Lien Deboosere, Pieter Simoens, Brecht Vermeulen, Didier Colle, Chris Develder, Mario Pickavet, Bart Dhoedt, and Piet Demeester. "Energy Efficiency in Thin Client Solutions." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 109–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11733-6_12.

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Karsenti, Laurent, and Réda Khellou. "Enedis IoT Smart Grid Solutions for More Efficiency." In Lecture Notes in Electrical Engineering, 203–12. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9008-2_18.

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Korovina, Maria V., Hovik A. Matevossian, and Ilya N. Smirnov. "On the Asymptotics of Solutions of the Wave Operator with Meromorphic Coefficients." In Lecture Notes in Civil Engineering, 177–89. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9121-1_14.

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Griesemann, J. C., D. Corgier, P. Achard, R. Metkemeyer, B. Marcenaro, F. Federici, P. Ekdunge, et al. "Hydrogen Air Fuel Cell Powered Passenger Car Fever — Fuel Cell Electric Vehicle for Efficiency and Range." In Hydrogen Power: Theoretical and Engineering Solutions, 1–11. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-015-9054-9_1.

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de Fátima Castro, Maria, Joana Andrade, Catarina Araújo, and Luís Bragança. "Solutions for Improving the Energy Efficiency of Buildings Refurbishment." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 45–56. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45293-3_4.

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Lukin, A. G., A. R. Saraev, and E. E. Dozhdeva. "Once Again to the Question of Economic Efficiency of Medical Services." In Engineering Economics: Decisions and Solutions from Eurasian Perspective, 578–82. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53277-2_69.

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Galindres, Diana M., Ana C. F. Ribeiro, Edgar F. Vargas, Luis M. P. Veríssimo, Artur J. M. Valente, and Miguel A. Esteso. "Limiting Diffusion Coefficients of Bovine Serum Albumin in Aqueous Solutions of Sulfonated Resorcinarenes." In Chemistry and Chemical Engineering for Sustainable Development, 1–13. Includes bibliographical references and index.: Apple Academic Press, 2020. http://dx.doi.org/10.1201/9780367815967-1.

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Babordina, O. A., M. P. Garanina, P. A. Garanin, and E. K. Chirkunova. "Digitalization and Project Management Method in Improving Efficiency of Drilling Wells Construction." In Engineering Economics: Decisions and Solutions from Eurasian Perspective, 348–53. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53277-2_42.

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Zhou, Zhengang, Dejun Liu, and Xiujie Lv. "Vibration-Based Damage Joint Identification Method for Superstructure and Substructure of Piles-Supported Frame Structure." In Lecture Notes in Civil Engineering, 209–25. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1260-3_19.

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AbstractIn order to jointly identify the damage locations of superstructure and substructure of the piles-supported frame structures, a damage identification method based on vibration is proposed. Firstly, the high-efficiency modes which are sensitive to the damage of the piles-supported frame structures are determined. Then, the element modal strain energy difference functions of the corresponding high-efficiency modes are calculated before and after the damage, and finally the damage locations are identified by the average values of the absolute values of the wavelet transform coefficients of the element modal strain energy difference functions of high-efficiency modes. The effectiveness of the method is studied by numerical simulation. Numerical results show that the method can identify the damage location of the single damage or multiple damage of the piles-supported frame structures. Although the adjacent effect exists, the damage areas can be effectively located. At the same time, the method can effectively identify the damage locations of the hidden pile foundation.

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Conference papers on the topic "Coefficients of engineering solutions efficiency"

Alam, M. K., H. Pasic, K. Anagurthi, and R. Zhong. "Determination of Surface Heat Flux in Quenching." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-1092.

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Abstract Quench probes have been used to collect temperature data in controlled quenching experiments; the data is then used to deduce the heat transfer coefficients in the quenching medium. The process of determination of the heat transfer coefficient at the surface is the inverse heat conduction problem, which is extremely sensitive to measurement errors. This paper reports on an experimental and theoretical study of quenching carried out to determine the surface heat flux history during a quenching process by an inverse algorithm based on an analytical solution. The algorithm is applied to experimental data from a quenching experiment. The surface heat flux is then calculated, and the theoretical curve obtained from the analytical solution is compared with experimental results. The inverse calculation appears to produce fast, stable, but approximate results. These results can be used as the initial guess to improve the efficiency of iterative numerical solutions which are sensitive to the initial guess.

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Gilsinn, David E. "Discrete Fourier Series Approximation to Periodic Solutions of Autonomous Delay Differential Equations." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-84038.

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This paper describes the algorithmic details involved in developing high-order Fourier series representations for periodic solutions to autonomous delay differential equations. Although the final approximate Fourier coefficients are computed by way of a nonlinear minimization algorithm, the steps to set up the objective function are shown to involve a sequence of matrix-vector operations. By proper coordination, these operations can be made very efficient so that high-order approximations can be obtained easily. An example of the calculations is shown for a Van der Pol equation with unit delay.

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Dalton, Charles, and Wu Zheng. "Numerical Solutions of a Viscous Uniform Approach Flow Past Square and Diamond Cylinders." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32287.

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Numerical results are presented for a uniform approach flow past square and diamond cylinders, with and without rounded corners, at Reynolds numbers of 250 and 1000. This unsteady viscous flow problem is formulated by the 2-D Navier-Stokes equations in vorticity and stream-function form on body-fitted coordinates and solved by a finite-difference method. Second-order Adams-Bashforth and central-difference schemes are used to discretize the vorticity transport equation while a third-order upwinding scheme is incorporated to represent the nonlinear convective terms. A grid generation technique is applied to provide an efficient mesh system for the flow. The elliptic partial differential equation for stream-function and vorticity in the transformed plane is solved by the multigrid iteration method. The Strouhal number and the average in-line force coefficients agree very well with the experimental and previous numerical values. The vortex structures and the evolution of vortex shedding are illustrated by vorticity contours. Rounding the corners of the square and diamond cylinders produced a noticeable decrease on the calculated drag and lift coefficients.

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Arik, Mehmet, James Petroski, Avram Bar-Cohen, and Mehmet Demiroglu. "Energy Efficiency of Low Form Factor Cooling Devices." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41275.

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With increasing attention to the energy efficiency of consumer and commercial products, thermal engineering and science community is devoting greater effort and attention to the design and implementation of energy-efficient cooling solutions. This study focuses on the cooling potential and Coefficient of Performance, (COP), achievable with three distinct meso-scale cooling technologies, applicable to a wide range of electronics cooling challenges. The thermo-fluid and thermodynamic characteristics of synthetic jets, piezo-driven vibrating blades, and compact muffin fans will be addressed. We are dedicating this paper to Prof. Kakac for his contributions to heat transfer science and technology, developing young scientists, writing highly valuable heat transfer textbooks, and most importantly for his kindness and friendship.

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Yanaga, Koji, Yuan Gao, Ruijie Li, and Songgang Qiu. "Stirling Engine Robust Foil Regenerator Efficiency." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11382.

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Abstract Combined Heat and Power (CHP) systems are one of the solutions to save energy by utilizing waste heat for addressing global warming and the global energy crisis. In many CHP technologies, the Stirling engine is outstanding since it has the advantage of various energy sources such as solar, geothermal, and industrial heat waste. The regenerator plays a key role in building a high efficiency Stirling Engine. Since it works as an energy storage component in the Stirling engine, its performance directly affects the Stirling engine efficiency. In the previous research, a new regenerator called the robust foil regenerator was designed to improve the performance of the regenerator. The regenerator was manufactured through the method of additive manufacturing techniques since the thickness of each flow channel is 0.3mm. In this research, a test bench was designed and manufactured to reveal the characteristics of the regenerator experimentally. By measuring the pressure drop and the temperature difference through the regenerator, the friction coefficient and the Nusselt number correlations were derived respectively. These correlations were compared to the published friction factor and Nusselt number correlations. In addition, to evaluate the geometrical configuration of the regenerator, the NPH/NTU ratio was calculated using the derived friction coefficient and Nusselt number.

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Tsaoulidis, Dimitrios, Eduardo Garciadiego Ortega, and Panagiota Angeli. "Extraction of {UO2}2+ in Intensified Separators of Different Sizes Using Ionic Liquids." In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60758.

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In this work the extraction of dioxouranium(VI) from aqueous nitric acid solutions (3M) into TBP/ionic liquid mixtures (30% v/v), is studied in intensified small scale separator channels of different sizes. High speed imaging is used to obtain the important hydrodynamic features of the flow (i.e. plug velocity and plug length) which are related to mass transfer and extraction efficiency. It was found that the overall mass transfer coefficients varied between 0.07 and 0.24 s−1 and increase by decreasing the channel size. The extraction efficiency was also affected by the channel size. A decrease in channel size leads to higher extraction efficiencies, while for a certain channel size the extraction efficiency decreases by increasing the mixture velocity.

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Pernot, S., and C. H. Lamarque. "A Wavelet Based Procedure to Study Vibrations and Stability." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8006.

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Abstract A Wavelet-Galerkin procedure is introduced in order to obtain periodic solutions of multidegrees-of-freedom dynamical systems with periodic time-varying coefficients. The procedure is then used to study the vibrations of parametrically excited mechanical systems. As problems of stability analysis of nonlinear systems are often reduced after linearization to problems involving linear differential systems with time-varying coefficients, we demonstrate the method provides efficient practical computations of Floquet exponents and consequently allows to give estimators for stability/instability levels. A few academic examples illustrate the relevance of the method.

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Michalek, Jeremy J., and Panos Y. Papalambros. "An Efficient Weighting Update Method to Achieve Acceptable Consistency Deviation in Analytical Target Cascading." In ASME 2004 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/detc2004-57134.

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Weighting coefficients are used in Analytical Target Cascading (ATC) at each element of the hierarchy to express the relative importance of matching targets passed from the parent element and maintaining consistency of linking variables and consistency with designs achieved by subsystem child elements. Proper selection of weight values is crucial when the top level targets are unattainable, for example when “stretch” targets are used. In this case, strict design consistency cannot be achieved with finite weights; however, it is possible to achieve arbitrarily small inconsistencies. This article presents an iterative method for finding weighting coefficients that achieve solutions within user-specified inconsistency tolerances and demonstrates its effectiveness with several examples. The method also led to reduced computational time in the demonstration examples.

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Xu, Tongge, Shuiting Ding, and Guo Li. "Establishment of the Off-Center Embedded Crack Stress Intensity Factor Database for Probabilistic Risk Assessment Based on Universal Weight Function." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-70198.

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Abstract Probabilistic failure risk analysis is important in recent development of airworthiness. In the fracture mechanics module of probabilistic failure risk analysis, efficient and accurate stress intensity factor (SIF) solutions are vital. Universal weight function (UWF) is a method that has a remarkable computational efficiency and high accuracy in SIF calculation. However, the concrete coefficients in the UWF remain unknown, and the rules of the geometric parameters and these coefficients have not been clarified. This limitation hinders the subsequent application of the method. This article discusses general off-center embedded cracks. The response surface method (RSM), as a means of database establishment, is used to construct the relations between the coefficients in the UWF and geometric parameters. The mean absolute percentage errors of the SIFs between UWF and finite element method are less than 4% within a certain range. Gaussian process regression is adopted to better fit the data, especially when the crack is near the plate boundary and the R-square is over 0.96. In addition, the effect of the offset distance on SIFs is discussed for a certain embedded crack in a given plate. Results show that changes in the SIFs are dependent on the plate boundary in the uniform stress field. However, stress predominates the changes in the SIFs when the crack is not very close to the plate boundary in the nonuniform distributed stress fields. The databases and discussion that followed can provide some reference and inspiration for further research.

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Brezger, Friedrich, and Albert Albers. "An Approach to Rating of Vehicle Climate Controls in Hybrid and Electric Driven Vehicles for Energy Efficiency." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88888.

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As part of the auxiliary components, climate controls and heating devices do have a relatively high energy consumption maintaining the comfort in the passenger cabin, which is a problem in the development of hybrid and especially electric vehicles. Hence, these vehicles have high potentials in optimizing the climate control. Several concepts of optimizing energy consumption are well known, such as insulation, glasses with better transmission coefficients, pre-conditioning or heat exchanger of outlet air. The efforts, the complexity, the installation space and the weight of these implementations are increasing. The weight of these additional components has an impact on the energy consumption of the vehicle. In order to evaluate the interdependencies between the direct energy consumption of possible solutions and their additional effects in early stages of product development, this paper introduces one possible approach for rating. Using the example of a heat pump which will be used for heating and cooling the passenger’s cabin, the applicable modeling in Matlab/Simulink will be demonstrated. One part of this implementation is a comparison of the approach based on Frank [Gro10] and another approach based on Nitz and Hucho [Gro10] in aspects of a sensitivity study. Furthermore, the impact of different insulation methods (glass transmission, insulation of the carriage) at extreme and average environmental boundary conditions as well as the changed weight and installation space is investigated. Therefore an environmental model is introduced which takes day time, season as well as GPS data into account. Target of this investigation is defining the minimum necessary power of a heat pump in the passenger cabin of a commercial vehicle with the smallest possible installation space and increase in weight. By modeling and analyzing this example scenario, sustainable values are derived in order to enable a cost-utility analysis of different vehicles in their respective market segments and the chosen solution of climate control.

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Reports on the topic "Coefficients of engineering solutions efficiency"

Ruff, Grigory, and Tatyana Sidorina. THE DEVELOPMENT MODEL OF ENGINEERING CREATIVITY IN STUDENTS OF MILITARY INSTITUTIONS. Science and Innovation Center Publishing House, December 2020. http://dx.doi.org/10.12731/model_of_engineering_creativity.

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The troops of the national guard of the Russian Federation are equipped with modern models of weapons, special equipment, Informatization tools, engineering weapons that have artificial intelligence in their composition are being developed, " etc., which causes an increase in the requirements for the quality of professional training of future officers. The increasing complexity of military professional activities, the avalanche-like increase in information, the need to develop the ability to quickly and accurately make and implement well-known and own engineering solutions in an unpredictable military environment demonstrates that the most important tasks of modern higher education are not only providing graduates with a system of fundamental and special knowledge and skills, but also developing their professional independence, and this led to the concept of engineering and creative potential in the list of professionally important qualities of an officer. To expedite a special mechanism system compact intense clarity through cognitive visualization of the educational material, thickening of educational knowledge through encoding, consolidation and structuring Principle of cognitive visualization stems from the psychological laws in accordance with which the efficiency of absorption is increased if visibility in training does not only illustrative, but also cognitive function, which leads to active inclusion, along with the left and right hemispheres of the student in the process of assimilation of information, based on the use of logical and semantic modeling, which contributes to the development of engineering and creative potential.

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Johra, Hicham. Performance overview of caloric heat pumps: magnetocaloric, elastocaloric, electrocaloric and barocaloric systems. Department of the Built Environment, Aalborg University, January 2022. http://dx.doi.org/10.54337/aau467469997.

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Heat pumps are an excellent solution to supply heating and cooling for indoor space conditioning and domestic hot water production. Conventional heat pumps are typically electrically driven and operate with a vapour-compression thermodynamic cycle of refrigerant fluid to transfer heat from a cold source to a warmer sink. This mature technology is cost-effective and achieves appreciable coefficients of performance (COP). The heat pump market demand is driven up by the urge to improve the energy efficiency of building heating systems coupled with the increase of global cooling needs for air-conditioning. Unfortunately, the refrigerants used in current conventional heat pumps can have a large greenhouse or ozone-depletion effect. Alternative gaseous refrigerants have been identified but they present some issues regarding toxicity, flammability, explosivity, low energy efficiency or high cost. However, several non-vapour-compression heat pump technologies have been invented and could be promising alternatives to conventional systems, with potential for higher COP and without the aforementioned refrigerant drawbacks. Among those, the systems based on the so-called “caloric effects” of solid-state refrigerants are gaining large attention. These caloric effects are characterized by a phase transition varying entropy in the material, resulting in a large adiabatic temperature change. This phase transition is induced by a variation of a specific external field applied to the solid refrigerant. Therefore, the magnetocaloric, elastocaloric, electrocaloric and barocaloric effects are adiabatic temperature changes in specific materials when varying the magnetic field, uniaxial mechanical stress, electrical field or hydrostatic pressure, respectively. Heat pump cycle can be built from these caloric effects and several heating/cooling prototypes were developed and tested over the last few decades. Although not a mature technology yet, some of these caloric systems are well suited to become new efficient and sustainable solutions for indoor space conditioning and domestic hot water production. This technical report (and the paper to which this report is supplementary materials) aims to raise awareness in the building community about these innovative caloric systems. It sheds some light on the recent progress in that field and compares the performance of caloric systems with that of conventional vapour-compression heat pumps for building applications.

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ERDC : Where Science and Engineering Meet. Engineer Research and Development Center (U.S.), March 2022. http://dx.doi.org/10.21079/11681/43462.

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For nearly a century, the U.S. Army Engineer Research and Development Center (ERDC) has been at the forefront of tackling our nation's toughest engineering challenges, providing innovative solutions in the areas of civil works and military engineering, and offsetting the negative effects of climate change. From its earliest days of hydrology experiments along the Mississippi River in 1929, ERDC's R&D has grown, along with its buildings and capabilities. Today, ERDC's facilities, combined with its people, have created one of the world's premier R&D organizations supporting the delivery of projects and programs for federal, state and local agencies as well as private, academic and international partners. ERDC's ongoing R&D, aligned with the U.S. Army Corps of Engineers (USACE) R&D portfolios, allows key investments to be targeted to strategic areas that can benefit multiple interests. ERDC's R&D enhances USACE's ability to execute its Civil Works (CW) missions to support commercial navigation, manage ecosystems and reduce flood risk, while our research in Installations and Operational Environments (IOE) is improving the reliability, efficiency and effectiveness of military infrastructure and on the battlefield. ERDC conducts scientific R&D to improve all aspects of mission planning, preparation, execution and sustainment, including innovations to protect the Warfighter. Sustained, multiyear support for ERDC R&D is critical to institutionalize successes and magnify benefits, enabling the nation to take a proactive approach to meeting the complex challenges of both today and tomorrow.

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