SECOND INTERNATIONAL CONFERENCE ON MATERIAL SCIENCE, SMART STRUCTURES AND APPLICATIONS: ICMSS-2019最新文献

{"title":"A dynamic model of a solar driven trigeneration system based on micro-ORC and adsorption chiller prototypes","authors":"W. Lombardo, S. Ottaviano, L. Branchini, Salvatore Vasta, A. D. Pascale, A. Sapienza","doi":"10.1063/1.5138831","DOIUrl":"https://doi.org/10.1063/1.5138831","url":null,"abstract":"The aim of this work is to present a dynamic model of an innovative small-scale trigeneration system implemented by means of TRNSYS. The modelled system is composed of a solar field, a low-temperature micro-Organic Rankine Cycle plant (ORC) and an adsorption chiller (AC). In particular, the main innovation of the model is the utilization of a micro-ORC machine and adsorption chiller implemented on TRNSYS by user-defined types that use experimental performance data obtained by a full characterization of ORC and AC prototypes, implemented at University of Bologna and at CNR - ITAE respectively. The considered micro-ORC system is driven by a reciprocating piston expander prototype, made of three radial cylinders with total displacement of 230 cm3. The other components are two brazed plate heat exchangers as evaporator and recuperator, a prototypal gear pump and a shell-and-tube condenser. The adopted working fluid is HFC-134a, suitable for heat source temperature up to 100 °C and characterized by a global warming potential (GWP) equal to 1430. The adsorption chiller prototype is characterized by an innovative architecture, employing 3 adsorbers connected to a single evaporator and condenser and by the use of hybrid adsorbers, realized embedding microporous Silica Gel loose grains into aluminium flat tube heat exchangers, previously coated with the Mitsubishi AQSOA FAM Z02 sorbent. The cooling machine has a nominal capacity of 4.4 kWc. Both the AC and ORC prototypes can be driven by low grade thermal energy (<90°C) from waste heat, industrial processes or renewable energy sources. The model realized is easily adaptable to any other plant by redefining the different subsystems of the desired technology and, in conclusion, this study has highlighted the promising characteristics of ORC and AC technologies in tri-generative configuration, with a 63% of global efficiency.","PeriodicalId":182421,"journal":{"name":"SECOND INTERNATIONAL CONFERENCE ON MATERIAL SCIENCE, SMART STRUCTURES AND APPLICATIONS: ICMSS-2019","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125522710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Methodology for teaching model-oriented design of mechatronic systems","authors":"R. S. Gavrylov, Yu. N. Mystafaev","doi":"10.1063/1.5140131","DOIUrl":"https://doi.org/10.1063/1.5140131","url":null,"abstract":"The paper discusses the issues of model-oriented design of embedded control systems for various purposes by means of Matlab-Simulink for DSP-controllers TMS and STM32. The examples of laboratory testing facilities intended for students (bachelors/undergraduates) studying the basics of drive control systems designing, familiarizing themselves with the material and technical means for mechatronic systems implementing, developing control system algorithms in a Matlab-Simulink environment, generating executable code, loading it into the controller and the results verification are presented in the article. A modern approach of teaching students the basics of automatic control should go along with the methods of mechatronic systems model-oriented design, which is one of the most promising design methods nowadays. The developer has almost unlimited possibilities in the field of constructing object control algorithms of any complexity with the loadable library modules and compilers for executable code generation in the Matlab-Simulink environment for TMS and STM32 DSP-controllers and a number of others. The proposed teaching methodology covers a wide aspect of competencies in related fields such as: electrical machines, automatic control theory, circuit engineering and microelectronics and modeling.The paper discusses the issues of model-oriented design of embedded control systems for various purposes by means of Matlab-Simulink for DSP-controllers TMS and STM32. The examples of laboratory testing facilities intended for students (bachelors/undergraduates) studying the basics of drive control systems designing, familiarizing themselves with the material and technical means for mechatronic systems implementing, developing control system algorithms in a Matlab-Simulink environment, generating executable code, loading it into the controller and the results verification are presented in the article. A modern approach of teaching students the basics of automatic control should go along with the methods of mechatronic systems model-oriented design, which is one of the most promising design methods nowadays. The developer has almost unlimited possibilities in the field of constructing object control algorithms of any complexity with the loadable library modules and compilers for executable code generation ...","PeriodicalId":182421,"journal":{"name":"SECOND INTERNATIONAL CONFERENCE ON MATERIAL SCIENCE, SMART STRUCTURES AND APPLICATIONS: ICMSS-2019","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126634368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On strength of monocrystalline alloys of complex composition based on iron","authors":"Y. Migal’, V. I. Kolesnikov","doi":"10.1063/1.5138410","DOIUrl":"https://doi.org/10.1063/1.5138410","url":null,"abstract":"We considered strength of an extended cell simulating the structure of a high-entropy crystal alloy сcontaining iron. Atoms of five chemical elements, including iron, are randomly distributed within the cell. Calculations of cell tensile strength were carried out by using a complex of quantum chemical programs ADF. It is shown that for any arrangement of atoms in the cell, its strength is always less than the strength of the cell consisting only of iron atoms.We considered strength of an extended cell simulating the structure of a high-entropy crystal alloy сcontaining iron. Atoms of five chemical elements, including iron, are randomly distributed within the cell. Calculations of cell tensile strength were carried out by using a complex of quantum chemical programs ADF. It is shown that for any arrangement of atoms in the cell, its strength is always less than the strength of the cell consisting only of iron atoms.","PeriodicalId":182421,"journal":{"name":"SECOND INTERNATIONAL CONFERENCE ON MATERIAL SCIENCE, SMART STRUCTURES AND APPLICATIONS: ICMSS-2019","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123359555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phase change materials (PCM) for building envelope applications: A review of numerical models","authors":"J. H. N. Ehms, R. Oliveski, L. Rocha, C. Biserni, M. Garai","doi":"10.1063/1.5138853","DOIUrl":"https://doi.org/10.1063/1.5138853","url":null,"abstract":"Phase Change Materials (PCM) present a great potential for energy efficiency gains in thermal systems, e.g. by storing solar energy in buildings or heat loads in industrial processes. This is because a great amount of energy can be stored per mass unit within a small temperature range. Significant applications of this peculiar characteristic of PCM regard the effective adoption of macro-encapsulated PCM into building envelopes. Several studies on this topic tend to be limited to a sort of “material selections” on PCM and a lack of systematic analysis has consequently emerged. In order to guarantee an effective use coupled with economic feasibility, a deep understanding of the phase transition phenomenon is needed. The study of PCM using computational fluid dynamics (CFD) is documented in several works, in accordance with the current trend of CFD to become increasingly widespread. Numerical studies on solidification and melting processes use a combination of formulations to describe the physical phenomena ...","PeriodicalId":182421,"journal":{"name":"SECOND INTERNATIONAL CONFERENCE ON MATERIAL SCIENCE, SMART STRUCTURES AND APPLICATIONS: ICMSS-2019","volume":"210 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120979462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance and combustion analysis of a supercharged double-fuel spark ignition engine","authors":"S. Beccari, E. Pipitone","doi":"10.1063/1.5138750","DOIUrl":"https://doi.org/10.1063/1.5138750","url":null,"abstract":"In order to increase fuel economy and reduce pollutant emissions in the last decades light duty spark ignition (SI) engines have become smaller, supercharged and equipped with direct injection. A suitable alternative to oil derived fuel is represented by gaseous fuels, such as Natural Gas (NG) and Liquefied Petroleum Gas (LPG), whose higher knock resistance and better mixing capabilities substantially improve vehicle fuel economy and pollutant emissions. The simultaneous combustion of gasoline and gaseous fuel (Double-Fuel operation, DF) in a naturally aspirated SI engine has already been investigated in the past also by the same authors, proving remarkable results in terms of engine efficiency increment and exhaust emissions reduction. In this paper the authors present the results of a new methodical experimental study aimed to investigate engine performance, efficiency and pollutant emissions obtained on a supercharged SI engine operated in double fuel mode, with comparison to the use of “reference” pure fuels (i.e. gasoline and NG). A detailed heat release analysis is also performed with the aim to highlight the effect of fuel mixture composition (i.e. the proportion between gasoline and NG) and of charging pressure on the combustion speed.","PeriodicalId":182421,"journal":{"name":"SECOND INTERNATIONAL CONFERENCE ON MATERIAL SCIENCE, SMART STRUCTURES AND APPLICATIONS: ICMSS-2019","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121065136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Approximate method for phase change in self healing materials","authors":"R. Basu","doi":"10.1063/1.5141449","DOIUrl":"https://doi.org/10.1063/1.5141449","url":null,"abstract":"A semi-infinite medium where temperature and concentration are coupled is solved for variable diffusivity phase change. An approximate technique is applied to estimate concentration, temperature, penetration lengths and velocity of change. Surface conditions are held constant whereas diffusivity is allowed to vary slowly corresponding to phase change in the matrix. Penetration lengths are analytically evaluated. A perturbation analysis allows the boundary layer lengths to be estimated, whence the two parameters can be compared. Application to phase change concepts relating to self- healing materials is illustrated.","PeriodicalId":182421,"journal":{"name":"SECOND INTERNATIONAL CONFERENCE ON MATERIAL SCIENCE, SMART STRUCTURES AND APPLICATIONS: ICMSS-2019","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116063485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Considerations on CO2 and pollutants emissions of modern cars","authors":"D. Bonalumi","doi":"10.1063/1.5138757","DOIUrl":"https://doi.org/10.1063/1.5138757","url":null,"abstract":"The European Union is pursuing the path of the decarbonization, with a stronger commitment than other countries, involving all the energy sectors. This paper is focused on the transportation sector. From a bibliography review, several solutions are proposed by the automotive manufacturers to meet the limits of emissions. Besides the Electric and Plug-in Hybrid Vehicles, the Internal Combustion Engines are obtaining positive improvements. Based on these considerations, the effect of the modernization of the Italian fleet of passengers cars is here proposed and assessed.The European Union is pursuing the path of the decarbonization, with a stronger commitment than other countries, involving all the energy sectors. This paper is focused on the transportation sector. From a bibliography review, several solutions are proposed by the automotive manufacturers to meet the limits of emissions. Besides the Electric and Plug-in Hybrid Vehicles, the Internal Combustion Engines are obtaining positive improvements. Based on these considerations, the effect of the modernization of the Italian fleet of passengers cars is here proposed and assessed.","PeriodicalId":182421,"journal":{"name":"SECOND INTERNATIONAL CONFERENCE ON MATERIAL SCIENCE, SMART STRUCTURES AND APPLICATIONS: ICMSS-2019","volume":"246 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116115566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Calculation of three-dimensional stationary magnetic fields of actuators with shape memory effect using point magnetic moments","authors":"A. Balaban, Y. Bakhvalov, V. Grechikhin","doi":"10.1063/1.5138442","DOIUrl":"https://doi.org/10.1063/1.5138442","url":null,"abstract":"The problems of calculation of three-dimensional stationary magnetic fields of actuators with shape memory, which are used in control devices of electrical systems and complexes are considered. A special feature of the actuators is an open magnetic system, which causes a large dimension of the problem when calculating the fields by the finite element method. It is proposed to use a mesh-free method for calculating the field using magnetic moments of point sources to describe the fields in ferromagnets and the surrounding space. This approach is tested on a problem with a known analytical solution. A mathematical model of the magnetic field of the actuator and an algorithm for solving the problem of calculating the field parameters are constructed. The use of point magnetic moments can reduce the dimension of the field calculation problem and, as a result, reduce the calculation time. The developed method is advisable to use in the modeling of three-dimensional fields of various electrical devices.The problems of calculation of three-dimensional stationary magnetic fields of actuators with shape memory, which are used in control devices of electrical systems and complexes are considered. A special feature of the actuators is an open magnetic system, which causes a large dimension of the problem when calculating the fields by the finite element method. It is proposed to use a mesh-free method for calculating the field using magnetic moments of point sources to describe the fields in ferromagnets and the surrounding space. This approach is tested on a problem with a known analytical solution. A mathematical model of the magnetic field of the actuator and an algorithm for solving the problem of calculating the field parameters are constructed. The use of point magnetic moments can reduce the dimension of the field calculation problem and, as a result, reduce the calculation time. The developed method is advisable to use in the modeling of three-dimensional fields of various electrical devices.","PeriodicalId":182421,"journal":{"name":"SECOND INTERNATIONAL CONFERENCE ON MATERIAL SCIENCE, SMART STRUCTURES AND APPLICATIONS: ICMSS-2019","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122864070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling of self-heating for AlGaN/GaN HEMT with thermal conductivity degradation effect","authors":"L. Arivazhagan, D. Nirmal, J. Ajayan, D. Godfrey, J. S. Rakkumar, S. B. Lakshmi","doi":"10.1063/1.5141434","DOIUrl":"https://doi.org/10.1063/1.5141434","url":null,"abstract":"Model of self-heating for AlGaN/GaN High Electron Mobility Transistor (HEMT) is proposed. In the model, degradation of thermal conductivity effect is included. Model data of the device is obtained using MATLAB. Physical simulation of GaN-HEMT is carried out using Technology Computer Aided Design (TCAD). The model data is compared with the simulation result to validate the model. In the simulation, temperature and defect dependent thermal conductivity is used. The drain current and temperature are analyzed using pulsed I-V simulation. It is found that the proposed model data shows excellent fit with simulation characteristics.Model of self-heating for AlGaN/GaN High Electron Mobility Transistor (HEMT) is proposed. In the model, degradation of thermal conductivity effect is included. Model data of the device is obtained using MATLAB. Physical simulation of GaN-HEMT is carried out using Technology Computer Aided Design (TCAD). The model data is compared with the simulation result to validate the model. In the simulation, temperature and defect dependent thermal conductivity is used. The drain current and temperature are analyzed using pulsed I-V simulation. It is found that the proposed model data shows excellent fit with simulation characteristics.","PeriodicalId":182421,"journal":{"name":"SECOND INTERNATIONAL CONFERENCE ON MATERIAL SCIENCE, SMART STRUCTURES AND APPLICATIONS: ICMSS-2019","volume":"283 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131415706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Swash plate design for pressure ripple reduction – A theoretical analysis","authors":"P. Casoli, Mirko Pastori, F. Scolari","doi":"10.1063/1.5138771","DOIUrl":"https://doi.org/10.1063/1.5138771","url":null,"abstract":"The delivery pressure ripple has always been a critical aspect in fluid power applications, since it generates noise and stresses the hydraulic circuit components at the delivery side of the pump. In this paper a possible strategy for the reduction of the delivery pressure ripple is proposed regarding a variable displacement axial piston pump through suitable modification of the swash plate surface. For this purpose a mathematical model of the pump has been developed, focused on the fluid-dynamic aspect with particular attention on the piston kinematics. The model has been used to introduce a passive control solution in order to modify the instantaneously delivered flow rate and consequently the pressure ripple. In detail, it has been hypothesized to modify the swash plate realizing on its surface a profile with the purpose of modifying the motion law of the pistons. The simulations results have demonstrated the effectiveness of the proposed solution in reducing the amplitude of the pressure ripple.","PeriodicalId":182421,"journal":{"name":"SECOND INTERNATIONAL CONFERENCE ON MATERIAL SCIENCE, SMART STRUCTURES AND APPLICATIONS: ICMSS-2019","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131453905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}