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Residual stress analysis of the autofrettaged thick-walled tube using nonlinear kinematic hardening
, Article Journal of Pressure Vessel Technology, Transactions of the ASME ; Volume 135, Issue 2 , 2013 ; 00949930 (ISSN) ; Voyiadjis, G ; Hoseini, S. H ; Hosseinian, E ; Sharif University of Technology
2013
Abstract
Recent research indicates that accurate material behavior modeling plays an important role in the estimation of residual stresses in the bore of autofrettaged tubes. In this paper, the material behavior under plastic deformation is considered to be a function of the first stress invariant in addition to the second and the third invariants of the deviatoric stress tensor. The yield surface is assumed to depend on the first stress invariant and the Lode angle parameter which is defined as a function of the second and the third invariants of the deviatoric stress tensor. Furthermore for estimating the unloading behavior, the Chaboche's hardening evolution equation is modified. These...
Residual stress analysis of autofrettaged thick-walled spherical pressure vessel
, Article International Journal of Pressure Vessels and Piping ; Volume 87, Issue 7 , July , 2010 , Pages 396-401 ; 03080161 (ISSN) ; Farrahi, G. H ; Haghpanah Jahromi, B ; Hosseinian, E ; Sharif University of Technology
2010
Abstract
In this study, residual stress distributions in autofrettaged homogenous spherical pressure vessels subjected to different autofrettage pressures are evaluated. Results are obtained by developing an extension of variable material properties (VMP) method. The modification makes VMP method applicable for analyses of spherical vessels based on actual material behavior both in loading and unloading and considering variable Bauschinger effect. The residual stresses determined by employing finite element method are compared with VMP results and it is demonstrated that the using of simplified material models can cause significant error in estimation of hoop residual stress, especially near the...
Residual stress analyses of re-autofrettaged thick-walled tubes
, Article International Journal of Pressure Vessels and Piping ; Volume 98 , 2012 , Pages 57-64 ; 03080161 (ISSN) ; Voyiadjis, G. Z ; Hoseini, S. H ; Hosseinian, E ; Sharif University of Technology
Elsevier
2012
Abstract
In this paper the effect of the re-autofrettage process on the residual stress distribution at the wall of a thick-walled tube is considered. For accurate material behavior modeling, it is assumed that the yield surface is a function of all the stress invariants. Also for estimating the behavior of the material under loading-unloading process, a modified Chaboche's hardening model is applied. For evaluation of this unloading behavior model a series of loading-unloading tests are conducted on specimens that are made of the high strength steel, DIN1.6959. In addition the finite element simulations are implemented to simulate the re-autofrettage process and to estimate the residual stresses....
Agent-based Programming and it's Application Using GOAL
,
M.Sc. Thesis
Sharif University of Technology
;
Ramezanian, Rasoul
(Supervisor)
Abstract
With the significant advances in software engineering and developing complicated systems, it’s important to investigate the interaction between systems. Agentoriented software engineering is a new paradigm for developing distributed intelligent systems. Agent technology currently plays an important role in complex software development. The underlying paradigm offers a large repertoire of original concepts, architectures, interaction protocols, and methodologies for the analysis and the specification of complex systems built as Multi-Agent Systems (MAS). Several efforts, originating from academia, industry, and several standardisation consortium, have been made in order to provide new tools,...
Parametric Study and Numerical Simulation of Spiral Wound Heat Exchanger Performance at Cryogenic Temperatures
, M.Sc. Thesis Sharif University of Technology ; Afshin, Hossein (Supervisor)
Abstract
Cryogenic is the study of physical phenomena at temperatures below 123 Kelvin. One of the applications of cryogenic science is the liquefaction of gases. In the liquefaction cycles of gases, such as helium liquefaction, fluidization occurs in the pressure reducing valve but temperature of the gas should be greatly reduced before it enters the pressure reducing valve. For this purpose, high-performance heat exchangers should be used. Spiral Wound is one of the heat exchangers that has ability to achieve over 90% efficiency due to its structure. Researchs in the field of design and simulation of spiral heat exchangers are limited and are done with a lot of simple assumptions such as constant...
Environmental Assessment of CCS Projects for Power Plant in Iran
, M.Sc. Thesis Sharif University of Technology ; Arhami, Mohammad (Supervisor)
Abstract
Environmental contamination is one most important concern that human has encountered currently the increasing demand of power production has been lead to environmental problem, therefore it is crucial to find appropriate methods managing these sources. Carbon dioxide forming from usage of fossil fuel as the main source of energy play a central role in environmental issues of climate change in atmosphere, so more attention in its emission reduction seems vital. CCS has been used as a recent attractive in order to reduce the greenhouse gases emission for large industrial units releasing carbon dioxide. The aim of this paper is environmental and economical assessment using ccs for power plants...
Vibrations and stability analysis of double current-carrying strips interacting with magnetic field
, Article Acta Mechanica ; 2020 ; Firouz Abadi, R. D ; Sharif University of Technology
Springer
2020
Abstract
Interactive vibrations and buckling of double current-carrying strips (DCCS) are investigated in this study. Considering the rotational and transverse deformation of the strip, four coupled equations of motion are obtained using Hamilton’s principle. Using the Galerkin method, mass and stiffness matrices are extracted and the stability of the system is determined by solving the eigenvalue problem. Effects of pretension and elevated temperature on the stability of DCCS are studied for three types of materials and various arrangements. Finally, the effect of horizontal or vertical distance between strips on the critical current value is investigated. According to the results, the effects of...
Vibrations and stability analysis of double current-carrying strips interacting with magnetic field
, Article Acta Mechanica ; Volume 232, Issue 1 , 2021 , Pages 229-245 ; 00015970 (ISSN) ; Firouz Abadi, R. D ; Sharif University of Technology
Springer
2021
Abstract
Interactive vibrations and buckling of double current-carrying strips (DCCS) are investigated in this study. Considering the rotational and transverse deformation of the strip, four coupled equations of motion are obtained using Hamilton’s principle. Using the Galerkin method, mass and stiffness matrices are extracted and the stability of the system is determined by solving the eigenvalue problem. Effects of pretension and elevated temperature on the stability of DCCS are studied for three types of materials and various arrangements. Finally, the effect of horizontal or vertical distance between strips on the critical current value is investigated. According to the results, the effects of...
Optimal Landing Ground_run for FAR_23 Aircraft
, M.Sc. Thesis Sharif University of Technology ; Malaek, Mohammad Bagher (Supervisor)
Abstract
As demand for floght has been incrased, a critical questin to pose is that is it economic to use larger Ailplanes or smaller Airplanes with higher flight frequency should be use. It is self evident that in a large Airplane the whole seats can not be accupied in all cases. Conversly, in small Airplanes, in most cases the seats are accupied but for aqual demand there most be more flights.In order to increase the number of flights, new methods should be used in such a way that smaller Airplanes live the Runway as soon as possible.In this project with modelling all effective factor regarding to Landing of a commercial FAR_23 Airplane, the Landing distance and thr erquired time for living the...
An analytical framework for the solution of autofrettaged tubes under constant axial strain condition
, Article Journal of Pressure Vessel Technology, Transactions of the ASME ; Volume 131, Issue 6 , 2009 ; 00949930 (ISSN) ; Farrahi, G. H ; Movahhedy, M. R ; Sharif University of Technology
2009
Abstract
Autofrettage is a technique for introducing beneficial residual stresses into cylinders. Both analytical and numerical methods are used for the analysis of the autofrettage process. Analytical methods have been presented only for special cases of autofrettage. In this work, an analytical framework for the solution of autofrettaged tubes with constant axial strain conditions is developed. Material behavior is assumed to be incompressible, and two different quadratic polynomials are used for strain hardening in loading and unloading. Clearly, elastic perfectly plastic and linear hardening materials are the special cases of this general model. This quadratic material model is convenient for the...
An analytical method for spiral-wound heat exchanger: design and cost estimation considering temperature-dependent fluid properties
, Article International Journal of Numerical Methods for Heat and Fluid Flow ; 2020 ; Mostafazade Abolmaali, A ; Afshin, H ; Sharif University of Technology
Emerald Group Publishing Ltd
2020
Abstract
Purpose: Spiral-wound heat exchangers (SWHEs) are widely used in different industries. In special applications, such as cryogenic (HEs), fluid properties may significantly depend on fluid temperature. This paper aims to present an analytical method for design and rating of SWHEs considering variable fluid properties with consistent shell geometry and single-phase fluid. Design/methodology/approach: To consider variations of fluid properties, the HE is divided into identical segments, and the fluid properties are assumed to be constant in each segment. Validation of the analytical method is accomplished by using three-dimensional numerical simulation with shear stress transport k-ω model, and...
An analytical method for spiral-wound heat exchanger: design and cost estimation considering temperature-dependent fluid properties
, Article International Journal of Numerical Methods for Heat and Fluid Flow ; Volume 31, Issue 1 , 2021 , Pages 471-496 ; 09615539 (ISSN) ; Mostafazade Abolmaali, A ; Afshin, H ; Sharif University of Technology
Emerald Group Holdings Ltd
2021
Abstract
Purpose: Spiral-wound heat exchangers (SWHEs) are widely used in different industries. In special applications, such as cryogenic (HEs), fluid properties may significantly depend on fluid temperature. This paper aims to present an analytical method for design and rating of SWHEs considering variable fluid properties with consistent shell geometry and single-phase fluid. Design/methodology/approach: To consider variations of fluid properties, the HE is divided into identical segments, and the fluid properties are assumed to be constant in each segment. Validation of the analytical method is accomplished by using three-dimensional numerical simulation with shear stress transport k-ω model, and...
Modified shuffled-frog-leaping algorithm in company with neural networks for harmonic distortion minimisation in real-time control applications of programmed pulse-width modulation inverters
, Article IET Power Electronics ; Volume 4, Issue 8 , 2011 , Pages 943-950 ; 17554535 (ISSN) ; Mazaheri, B ; Abdi, B ; Hosseinian, S. H ; Sharif University of Technology
2011
Abstract
Harmonic pollution minimisation in voltage-source programmed pulse-width modulation (PPWM) inverters is defined as a time-limited optimisation problem in real-time applications with variable DC sources. In order to obtain minimum total harmonic distortion (THD) as the objective function, shuffled-frog-leaping algorithm (SFLA) is modified and employed to calculate the switching angles and compared with non-linear programming as a traditional optimisation method. In addition, particle swarm optimisation and three of its modified versions as popular evolutionary optimisation algorithms are employed to ensure the capability of the proposed optimisation method. Moreover, modified sinusoidal PWM...
Assessment of the resonance frequency of cantilever carbon nanocones using molecular dynamics simulation
, Article Applied Physics Letters ; Volume 100, Issue 17 , 2012 ; 00036951 (ISSN) ; Amini, H ; Hosseinian, A. R ; Sharif University of Technology
2012
Abstract
The resonance frequencies of cantilever carbon nanocones (CNCs) up to 4 nm in height are determined using molecular dynamics simulation based on adaptive intermolecular reactive empirical bond order potential. The frequency content of the free vibrations of CNCs under a lateral initial excitation at the tip is analyzed using fast Fourier transformation, and the resonance frequencies are obtained. The results are reported for various samples to investigate the dependency of the resonance frequency to the geometrical parameters and temperature of CNCs
On the control of tumor growth via type-1 and interval type-2 fuzzy logic
, Article Journal of Mechanics in Medicine and Biology ; Volume 15, Issue 5 , 2015 ; 02195194 (ISSN) ; Alasty, A ; Salarieh, H ; Hosseinian Sarajehlou, M ; Sharif University of Technology
2015
Abstract
This paper deals with growth control of cancer cells population using type-1 and interval type-2 fuzzy logic. A type-1 fuzzy controller is designed in order to reduce the population of cancer cells, adjust the drug dosage in a manner that allows normal cells re-grow in treatment period and maintain the maximum drug delivery rate and plasma concentration of drug in an appropriate range. Two different approaches are studied. One deals with reducing the number of cancer cells without any concern about the rate of decreasing, and the other takes the rate of malignant cells damage into consideration. Due to the fact that uncertainty is an inherent part of real systems and affects controller...
Material Modeling of DIN1.6959 Steel and Determination of Stresses in Autofrettaged Thick-Walled Tubes
, Ph.D. Dissertation Sharif University of Technology ; Farrahi, Gholamhossein (Supervisor) ; Asempour, Ahmad (Supervisor)
Abstract
In hydraulic autoferttage, the tube is subjected to high internal pressure and the resulting residual stresses increase the pressure capacity and fatigue lifetime of the tube. High strength steels are used for construction of such tubes. Material behavior of these steels is very complicated due to pronounced Bauschinger effect. DIN1.6959 steel is frequently used for construction of autofrettaged tubes in some countries such as Germany, Switzerland and Iran. In this work, the material behavior of this steel was modeled accurately using uniaxial tension-compression tests and mechanical properties and material behavior of this steel also were compared with A723 and HB7 steels. As a general...
Spillovers effect of gas price on macroeconomic indicators: A GVAR approach
, Article Energy Reports ; Volume 9 , 2023 , Pages 6211-6218 ; 23524847 (ISSN) ; Sohag, K ; Jamour, M ; Moridi Farimani, F ; Hosseinian, A ; Sharif University of Technology
Elsevier Ltd
2023
Abstract
The demand for natural gas as a transitional fuel has been increasing steadily due to global energy transitions. However, the high concentration of natural gas sources among a few producers and the dependence of many consuming economies raises questions about the macroeconomic impact of gas price shocks. Therefore, this study utilizes the global vector autoregressive (GVAR) approach to estimate the spillover effects of natural gas price shocks on key macroeconomic indicators. To enhance the GVAR data vintage, we have incorporated Iran and Russia in 24 countries and updated data till 2020. Our empirical analysis reveals that inflation responds positively to gas price hikes in major...
An analytical framework for the solution of autofrettaged tubes under constant axial strain condition
, Article ASME 2008 Pressure Vessels and Piping Conference, PVP2008, Chicago, IL, 27 July 2008 through 31 July 2008 ; Volume 5 , July , 2008 , Pages 71-80 ; 0277027X (ISSN); 9780791848289 (ISBN) ; Farrahi, G. H ; Movahhedy, M. R ; Pressure Vessels and Piping ; Sharif University of Technology
2008
Abstract
Autofrettage is a technique for introducing beneficial residual stresses into cylinders. Both analytical and numerical methods are used for analysis of the autofrettage process. Analytical methods have been presented only for special cases of autofrettage. In this work, an analytical framework for the solution of autofrettaged tubes with constant axial strain conditions is developed. Material behavior is assumed to be incompressible and two different quadratic polynomials are used for strain hardening in loading and unloading. Clearly, elastic-perfectly plastic and linear hardening materials are special cases of this general model. This material model is convenient for description of the...
Identification of suitable drug combinations for treating covid-19 using a novel machine learning approach: the rain method
, Article Life ; Volume 12, Issue 9 , 2022 ; 20751729 (ISSN) ; Salari, N ; Boush, M ; Mansouri, K ; Hosseinian-Far, A ; Ghasemi, H ; Mohammadi, M ; Sharif University of Technology
MDPI
2022
Abstract
COVID-19 affects several human genes, each with its own p-value. The combination of drugs associated with these genes with small p-values may lead to an estimation of the combined p-value between COVID-19 and some drug combinations, thereby increasing the effectiveness of these combinations in defeating the disease. Based on human genes, we introduced a new machine learning method that offers an effective drug combination with low combined p-values between them and COVID-19. This study follows an improved approach to systematic reviews, called the Systematic Review and Artificial Intelligence Network Meta-Analysis (RAIN), registered within PROSPERO (CRD42021256797), in which, the PRISMA...
Executive protocol designed for new review study called: systematic review and artificial intelligence network meta-analysis (RAIN) with the first application for COVID-19
, Article Biology Methods and Protocols ; Volume 8, Issue 1 , 2023 ; 23968923 (ISSN) ; Shohaimi, S ; Kiaei, A ; Hosseinian Far, A ; Mansouri, K ; Ahmadi, A ; Mohammadi, M ; Sharif University of Technology
Oxford University Press
2023
Abstract
Artificial intelligence (AI) as a suite of technologies can complement systematic review and meta-analysis studies and answer questions that cannot be typically answered using traditional review protocols and reporting methods. The purpose of this protocol is to introduce a new protocol to complete systematic review and meta-analysis studies. In this work, systematic review, meta-analysis, and meta-analysis network based on selected AI technique, and for P < 0.05 are followed, with a view to responding to questions and challenges that the global population is facing in light of the COVID-19 pandemic. Finally, it is expected that conducting reviews by following the proposed protocol can...