Mehdi Jabbari (سید مهدی جباری) | Yasouj University (original) (raw)

Papers by Mehdi Jabbari (سید مهدی جباری)

Journal of Solid Mechanics, 2016

In the present work, a study of thermoelastic analysis of a rotating thick truncated conical shel... more In the present work, a study of thermoelastic analysis of a rotating thick truncated conical shell subjected to the temperature gradient and non-uniform internal pressure is carried out. The formulation is based on first-order shear deformation theory (FSDT), which accounts for the transverse shear. The governing equations, derived using minimum total potential energy principle, are solved, using multi-layered method (MLM). The model has been verified with the results of finite element method (FEM) for several tapering angles of the truncated cone. The numerical results obtained are presented graphically and the effects of thermal and mechanical loading, tapering angle of truncated cone, and profile of internal pressure are studied in detail. © 2016 IAU, Arak Branch.All rights reserved.

Australian Journal of Mechanical Engineering, 2018

In this paper, based on the higher-order shear deformation theory, a thermo-elastic analysis for ... more In this paper, based on the higher-order shear deformation theory, a thermo-elastic analysis for axisymmetric clamped-clamped rotating pressurised thick cylindrical shells with variable thickness made of functionally graded materials subjected to thermal loading is presented. The material properties, except the Poisson's ratio, are assumed to vary with the power law function in the radial direction of the cylinder. The governing equations are a system of non-homogeneous ordinary differential equations with variable coefficients. Based on two-dimensional steady-state heat conduction equation, temperature distribution in cylinder with variable thickness is given. Using multilayer method, these equations could be converted into systems of differential equations with constant coefficients. The effects of higher-order approximations on the radial and axial displacements, von Mises stress and shear stress have been studied. Finally, the displacements and stresses along the radius and length have been plotted, and distribution of these is compared with the solution using finite-element method.

Journal of Solid Mechanics, 2017

In this paper, thermo-elastic analysis of a rotating thick truncated conical shell subjected to t... more In this paper, thermo-elastic analysis of a rotating thick truncated conical shell subjected to the temperature gradient, internal pressure and external pressure is presented. Given the existence of shear stress in the conical shell due to thickness change along the axial direction, the governing equations are obtained based on first-order shear deformation theory (FSDT). These equations are solved by using multi-layer method (MLM). The model has been verified with the results of finite element method (FEM). Finally, some numerical results are presented to study the effects of thermal and mechanical loading, geometry parameters of truncated conical shell.

Archive of Mechanical Engineering, 2014

In this article, the thick truncated cone shell is divided into disk-layers form with their thick... more In this article, the thick truncated cone shell is divided into disk-layers form with their thickness corresponding to the thickness of the cone. Due to the existence of shear stress in the truncated cone, the equations governing disk layers are obtained based on first shear deformation theory. These equations are in the form of a set of general differential equations. Given that the truncated cone is divided into n disks, n sets of differential equations are obtained. The solution of this set of equations, applying the boundary conditions and continuity conditions between the layers, yields displacements and stresses. The results obtained have been compared with those obtained through the analytical solution and the numerical solution. For the purpose of the analytical solution, use has been made of matched asymptotic method (MAM) and for the numerical solution, the finite element method (FEM).

ISRN Mechanical Engineering, 2014

Using disk form multilayers, an elastic analysis is presented for determination of displacements ... more Using disk form multilayers, an elastic analysis is presented for determination of displacements and stresses of rotating thick truncated conical shells. The cone is divided into disk layers form with their thickness corresponding to the thickness of the cone. Due to the existence of shear stress in the truncated cone, the equations governing disk layers are obtained based on first shear deformation theory (FSDT). These equations are in the form of a set of general differential equations. Given that the truncated cone is divided into n disks, n sets of differential equations are obtained. The solution of this set of equations, applying the boundary conditions and continuity conditions between the layers, yields displacements and stresses. The results obtained have been compared with those obtained through the analytical solution and the numerical solution.

The Scientific World Journal, 2014

Using disk form multilayers, a semi-analytical solution has been derived for determination of dis... more Using disk form multilayers, a semi-analytical solution has been derived for determination of displacements and stresses in a rotating cylindrical shell with variable thickness under uniform pressure. The thick cylinder is divided into disk form layers form with their thickness corresponding to the thickness of the cylinder. Due to the existence of shear stress in the thick cylindrical shell with variable thickness, the equations governing disk layers are obtained based on first-order shear deformation theory (FSDT). These equations are in the form of a set of general differential equations. Given that the cylinder is divided intondisks,nsets of differential equations are obtained. The solution of this set of equations, applying the boundary conditions and continuity conditions between the layers, yields displacements and stresses. A numerical solution using finite element method (FEM) is also presented and good agreement was found.

Applied and Computational Mechanics, 2017

Thick shells have attracted much attention in recent years as intelligent and functional graded m... more Thick shells have attracted much attention in recent years as intelligent and functional graded materials because of their unique properties. In this review paper, some critical issues and problems in the development of thick shells made from Functionally graded piezoelectric material (FGPM) are discussed. This review has been conducted on various types of methods which are available for thick shell analysis and mainly focuses on elasticity theories, shear deformation theory, simplified theories and mixed theories since they were widely used in the modeling of FG thick shells. It is expected that this comprehensive study will be very beneficial to everyone involved or interested in the shell models.

Journal of Applied Mechanics, 2003

In this paper, the general theoretical analysis of two-dimensional steady-state thermal stresses ... more In this paper, the general theoretical analysis of two-dimensional steady-state thermal stresses for a hollow thick cylinder made of functionally graded material is developed. The temperature distribution is assumed to be a function of radial and circumferential directions with general thermal and mechanical boundary conditions on the inside and outside surfaces. The material properties, except Poisson’s ratio, are assumed to depend on the variable r and they are expressed as power functions of r. The separation of variables and complex Fourier series are used to solve the heat conduction and Navier equations.

Periodica Polytechnica Mechanical Engineering, 2015

Using multi-layers method (MLM), a semi-analytical solution have been derived for determination o... more Using multi-layers method (MLM), a semi-analytical solution have been derived for determination of displacements and stresses in a thick cylindrical shell with variable thickness under non-uniform pressure. Three different profiles (convex, linear and concave) are considered for the variable thickness cylinder. Given the existence of shear stress in the thick cylindrical shell due to thickness and pressure changes along the axial direction, the governing equations are obtained based on first-order shear deformation theory (FSDT). These equations are in the form of a set of general differential equations with variable coefficients. Given that the thick cylinder with variable thickness is divided into n homogenous disks, n sets of differential equations with constant coefficients are obtained. The solution of this set of equations, applying the boundary conditions and continuity conditions between the layers, yields displacements and stresses. Finally, some numerical results are presented to study the effects of applied pressure, thickness profile type, and angular velocity on the mechanical behavior of the cylindrical shell. Keywords rotating thick cylindrical shell, variable thickness, hyperbolic profile, non-uniform pressure, multi-layers method (MLM) Period. Polytech. Mech. Eng. M. Z. Nejad, M. Jabbari, M. Ghannad

Engineering Solid Mechanics, 2015

In this article, the thick truncated cone shell is divided into disk-layers form with their thick... more In this article, the thick truncated cone shell is divided into disk-layers form with their thickness corresponding to the thickness of the cone. Due to the existence of shear stress in the truncated cone, the equations governing disk layers are obtained based on first shear deformation theory. These equations are in the form of a set of general differential equations. Given that the truncated cone is divided into n disks, n sets of differential equations are obtained. The solution of this set of equations, applying the boundary conditions and continuity conditions between the layers, yields displacements and stresses. The results obtained have been compared with those
obtained through the analytical solution and the numerical solution. For the purpose of the analytical solution, use has been made of matched asymptotic method (MAM) and for the numerical solution, the finite element method (FEM).

Using disk form multilayers, a semi-analytical solution has been derived for determination of dis... more Using disk form multilayers, a semi-analytical solution has been derived for determination of displacements and stresses in a rotating cylindrical shell with variable thickness under uniform pressure. The thick cylinder is divided into disk form layers form with their thickness corresponding to the thickness of the cylinder. Due to the existence of shear stress in the thick cylindrical shell with variable thickness, the equations governing disk layers are obtained based on first-order shear deformation theory (FSDT). These equations are in the form of a set of general differential equations. Given that the cylinder is divided into n disks, n sets of differential equations are obtained. The solution of this set of equations, applying the boundary conditions and continuity conditions between the layers, yields displacements and stresses. A numerical solution using finite element method (FEM) is also presented and good agreement was found.

1 -‫ﻣﻘﺪﻣﻪ‬ ‫ي‬ ‫وﻇﯿﻔﻪ‬ ‫ﮐﻪ‬ ‫اﺳﺖ‬ ‫ﺗﻮرﺑﯿﻦ‬ ‫ﺑﻪ‬ ‫ﺑﺨﺎر‬ ‫ورودي‬ ‫ﺷﯿﺮ‬ ‫واﻟﻮ‬ ‫اﺳﺘﺎپ‬ ‫دارد‬ ‫ﻧﯿﺎز‬... more 1 -‫ﻣﻘﺪﻣﻪ‬ ‫ي‬ ‫وﻇﯿﻔﻪ‬ ‫ﮐﻪ‬ ‫اﺳﺖ‬ ‫ﺗﻮرﺑﯿﻦ‬ ‫ﺑﻪ‬ ‫ﺑﺨﺎر‬ ‫ورودي‬ ‫ﺷﯿﺮ‬ ‫واﻟﻮ‬ ‫اﺳﺘﺎپ‬ ‫دارد‬ ‫ﻧﯿﺎز‬ ‫ﻣﻮاﻗﻊ‬ ‫در‬ ‫را‬ ‫ﺗﻮرﺑﯿﻦ‬ ‫ﺑﻪ‬ ‫ورودي‬ ‫ﺑﺨﺎر‬ ‫ﺟﺮﯾﺎن‬ ‫ﻗﻄﻊ‬ . ‫ﺗﻮﺟﻪ‬ ‫ﺑﺎ‬ ‫ﻧﯿﺮوﮔﺎه،‬ ‫ﺑﺮداري‬ ‫ﺑﻬﺮه‬ ‫ﻟﺤﻈﺎت‬ ‫ﺗﻤﺎﻣﯽ‬ ‫در‬ ‫ﺑﺎﯾﺴﺖ‬ ‫ﻣﯽ‬ ‫ﻣﻄﻠﺐ‬ ‫اﯾﻦ‬ ‫ﺑﻪ‬ ‫ﺑﺎﺷﺪ‬ ‫ﺑﺨﺎر‬ ‫ﺟﺮﯾﺎن‬ ‫ﻗﻄﻊ‬ ‫ي‬ ‫آﻣﺎده‬ . ‫اﺳﺘﺎپ‬ ‫ﺻﺤﯿﺢ‬ ‫ﻋﻤﻠﮑﺮد‬ ‫ﺑﺮرﺳﯽ‬ ‫ﻟﺬا‬ ‫ﻟﺤﻈﺎت‬ ‫ﺗﻤﺎﻣﯽ‬ ‫در‬ ‫واﻟﻮ‬ ‫اﺳﺖ‬ ‫اﻟﺰاﻣﯽ‬ ‫ﺑﺮداري‬ ‫ﺑﻬﺮه‬ . ‫ﻣﻮﺟﻮد‬ ‫اﺳﻨﺎد‬ ‫ﺑﺮ‬ ‫ﺑﻨﺎ‬ ‫ﻣﺸﻬﺪ‬ ‫ﻧﯿﺮوﮔﺎه‬ ‫اﻟﯿﻦ‬ ‫واﺣﺪ‬ ‫ﮐﻪ‬ ‫ﺷﺮاﯾﻄﯽ‬ ‫در‬ ‫واﺣﺪ‬ ‫اﯾﻦ‬ ‫واﻟﻮ‬ ‫اﺳﺘﺎپ‬ ، ‫ﮐﻨﺪ،‬ ‫ﻣﯽ‬ ‫اﻓﺖ‬ ‫ﻧﺎﮔﻬﺎﻧﯽ‬ ‫ﻃﻮر‬ ‫ﺑﻪ‬ ‫ﺑﺨﺎر‬ ‫دﻣﺎي‬ ‫ﻧﻤﯽ‬ ‫ﻋﻤﻞ‬ . ‫از‬ ‫ﭘﺲ‬ ‫ﻫﺎي‬ ‫ﺑﺮرﺳﯽ‬ ‫ي‬ ‫ﺳﺎﻗﻪ‬ ‫روي‬ ‫ﺑﺮ‬ ‫واﻟﻮ،‬ ‫اﺳﺘﺎپ‬ ‫ﺳﺎﺧﺘﻤﺎن‬ ‫روي‬ ‫اوﻟﯿﻪ‬ ‫اﺻﻠﯽ‬ ) ‫و‬ ‫رﻓﺖ‬ ‫ﺣﺮﮐﺖ‬ ‫اﻧﺘﻘﺎل‬ ‫ي‬ ‫وﻇﯿﻔﻪ‬ ‫ﮐﻪ‬ ‫واﻟﻮ‬ ‫اﺳﺘﺎپ‬ ‫ﻣﺮﮐﺰي‬ ‫ﺷﻔﺖ‬ ‫ﺷﺪن‬ ‫ﺑﺴﺘﻪ‬ ‫و‬ ‫ﺑﺎز‬ ‫ﺑﺮاي‬ ‫ﻧﺸﯿﻤﻨﮕﺎه‬ ‫ﺑﻪ‬ ‫ﻧﯿﺮو‬ ‫اﻋﻤﺎل‬ ‫ﻣﻨﺒﻊ‬ ‫از‬ ‫ﺑﺮﮔﺸﺖ‬ ‫را‬ ‫واﻟﻮ‬ ‫اﺳﺘﺎپ‬ ‫دارد‬ ( ‫ﺗﻤﺎس‬ ‫ﻧﺸﺎﻧﮕﺮ‬ ‫ﮐﻪ‬ ‫ﺷﺪ‬ ‫ﻣﺸﺎﻫﺪه‬ ‫ﻫﺎﯾﯽ‬ ‫ﺧﺮاش‬ ‫آن‬ ‫اﺳﺖ‬ ‫زﻣﺎن‬ ‫از‬ ‫ﻟﺤﻈﺎﺗﯽ‬ ‫در‬ ‫ﺑﺪﻧﻪ‬ ‫و‬ ‫ﺳﺎﻗﻪ‬ . ‫ﺷﮑﻞ‬ ) 1 ( ‫ﻫﺎي‬ ‫ﺧﺮاش‬ ‫دﻫﺪ‬ ‫ﻣﯽ‬ ‫ﻧﺸﺎن‬ ‫را‬ ‫واﻟﻮ‬ ‫اﺳﺘﺎپ‬ ‫روي‬ ‫ﻣﻮﺟﻮد‬ . ‫ﺷﮑﻞ‬ 1 : ‫اﺳﺘﻢ‬ ‫روي‬ ‫ﺷﺪه‬ ‫ﻣﺸﺎﻫﺪه‬ ‫ﻫﺎي‬ ‫ﺧﺮاش‬ ‫ﻋﻤﻠﮑﺮد‬ ‫ﻣﺎﻧﻊ‬ ‫ﺗﻤﺎس‬ ‫اﯾﻦ‬ ‫ﮐﻪ‬ ‫ﮔﺮﻓﺖ‬ ‫ﻧﺘﯿﺠﻪ‬ ‫ﺗﻮان‬ ‫ﻣﯽ‬ ‫ﺑﻨﺎﺑﺮاﯾﻦ‬ ‫اﺳﺖ‬ ‫ﺷﺪه‬ ‫واﻟﻮ‬ ‫اﺳﺘﺎپ‬ ‫ﺻﺤﯿﺢ‬ . ‫در‬ ‫واﻟﻮ‬ ‫اﺳﺘﺎپ‬ ‫اﯾﻨﮑﻪ‬ ‫ﺑﻪ‬ ‫ﺗﻮﺟﻪ‬ ‫ﺑﺎ‬ ‫ﺗﻤﺎس‬ ‫اﯾﺠﺎد‬ ‫اﺳﺖ‬ ‫ﺷﺪه‬ ‫ﻣﺸﮑﻞ‬ ‫دﭼﺎر‬ ‫دﻣﺎ‬ ‫ﺗﻐﯿﯿﺮات‬ ‫ﮔﺬراي‬ ‫ﺷﺮاﯾﻂ‬ ‫ﺑﺎﺷﺪ‬ ‫ﻧﻤﯽ‬ ‫داﺋﻤﯽ‬ ‫ﺻﻮرت‬ ‫ﺑﻪ‬ ‫واﻟﻮ‬ ‫اﺳﺘﺎپ‬ ‫ي‬ ‫ﺑﺪﻧﻪ‬ ‫و‬ ‫ﺳﺎﻗﻪ‬ ‫ﺑﯿﻦ‬ . ‫ﺑﺎ‬ ‫ي‬ ‫ﻣﺴﺌﻠﻪ‬ ‫ﮔﺮﻓﺖ‬ ‫ﻧﺘﯿﺠﻪ‬ ‫ﺗﻮان‬ ‫ﻣﯽ‬ ‫ﻓﻮق‬ ‫ﺗﻮﺿﯿﺤﺎت‬ ‫ﯾﮏ‬ ‫ﻣﻮردﻧﻈﺮ‬ ‫ﺑﻪ‬ ‫ﺗﻮﺟﻪ‬ ‫ﺑﺎ‬ ‫ﮐﻪ‬ ‫ﺑﺎﺷﺪ‬ ‫ﻣﯽ‬ ‫ﮔﺬرا‬ ‫ﺗﺮﻣﻮاﻻﺳﺘﯿﮏ‬ ‫ﺷﺮاﯾﻂ‬ ‫ﺑﺎ‬ ‫ﻫﻨﺪﺳﻪ‬ ‫ﻣﯽ‬ ‫و‬ ‫ﺑﺎﺷﺪ‬ ‫ﻧﻤﯽ‬ ‫ﻣﻮﺟﻮد‬ ‫آن‬ ‫ﺑﺮاي‬ ‫دﻗﯿﻖ‬ ‫ﺣﻞ‬ ‫ﻣﻮﺟﻮد‬ ‫ﻣﻮاد‬ ‫و‬ ‫ﻫﻨﺪﺳﻪ‬ ‫ﻧﻤﻮد‬ ‫اﺳﺘﻔﺎده‬ ‫ﻋﺪدي‬ ‫ﺣﻞ‬ ‫از‬ ‫ﺑﺎﯾﺴﺖ‬ . ‫ي‬ ‫زﻣﯿﻨﻪ‬ ‫در‬ ‫ﻣﻄﺎﻟﻌﺎت‬ ‫اوﻟﯿﻦ‬ ‫در‬ ‫ﺗﯿﻤﻮﺷﻨﮑﻮ‬ ‫ﺗﻮﺳﻂ‬ ‫اي‬ ‫اﺳﺘﻮاﻧﻪ‬ ‫ﻣﺨﺘﺼﺎت‬ ‫در‬ ‫ﺗﺮﻣﻮاﻻﺳﺘﯿﮏ‬ ‫ﺗﺤﻠﯿﻞ‬ ‫ارا‬ ‫اﻻﺳﺘﯿﺴﺘﻪ‬ ‫ﺗﺌﻮري‬ ‫ﮐﺘﺎب‬ ‫ﮔﺮدﯾﺪ‬ ‫ﺋﻪ‬ . [1] ‫از‬ ‫ﭘﺲ‬ ‫آ‬ ‫ﻣﻘﺎﻻت‬ ‫ن‬ ‫و‬ ‫ﻣﻮاد‬ ‫روي‬ ‫ﺑﺮ‬ ‫ﻏﺎﻟﺒﺎ‬ ‫ﮐﻪ‬ ‫ﮔﺮدﯾﺪﻧﺪ‬ ‫اراﺋﻪ‬ ‫زﻣﯿﻨﻪ‬ ‫اﯾﻦ‬ ‫در‬ ‫ﻣﺘﻌﺪدي‬ ‫در‬ ‫ﻫﺎ‬ ‫ﻓﻌﺎﻟﯿﺖ‬ ‫ﻏﺎﻟﺐ‬ ‫ﮐﻪ‬ ‫اﻧﺪ‬ ‫داده‬ ‫اﻧﺠﺎم‬ ‫ﺗﺤﻘﯿﻘﺎت‬ ‫ﻣﺮزي‬ ‫ﺷﺮاﯾﻂ‬ ‫ﺷﺮاﯾﻂ‬ ‫اﺳﺖ‬ ‫ﺷﺪه‬ ‫ﺑﺮرﺳﯽ‬ ‫ﯾﮑﻨﻮاﺧﺖ‬ . [2, 3, 4] ‫ﻫﺎي‬ ‫اﻓﺰار‬ ‫ﻧﺮم‬ ‫ﺑﺮوز‬ ‫ﺑﺎ‬ ‫ﻋﺪدي‬ ‫اراﺋﻪ‬ ‫ﮔﺬرا‬ ‫ﺣﺮارت‬ ‫اﻧﺘﻘﺎل‬ ‫ي‬ ‫زﻣﯿﻨﻪ‬ ‫در‬ ‫اي‬ ‫ﮔﺴﺘﺮده‬ ‫ﻣﻄﺎﻟﻌﺎت‬ ‫ﮔﺮدﯾﺪ‬ ‫اﺳﺖ‬ ‫ه‬ .

-‫د‬ ‫به‬ ‫فرکانس‬ ‫کنترل‬ ‫مد‬ ‫در‬ ‫توس‬ ‫نیروگاه‬ ‫واحدهای‬ ‫شرکت‬ ‫لیل‬ ‫استم‬ ‫شکست‬ ‫شبکه،‬... more -‫د‬ ‫به‬ ‫فرکانس‬ ‫کنترل‬ ‫مد‬ ‫در‬ ‫توس‬ ‫نیروگاه‬ ‫واحدهای‬ ‫شرکت‬ ‫لیل‬ ‫استم‬ ‫شکست‬ ‫شبکه،‬ ( Stem ) ‫ی‬ ‫ساقه‬ ‫ا‬ ‫بخار‬ ‫کنترل‬ ‫شیرهای‬ ‫ی‬ ‫توربین‬ ‫ی‬ ‫آن‬ ‫واحد‬ ‫چهار‬ ‫درهر‬ ‫فشارقوی‬ ‫اساسی‬ ‫مشکالت‬ ‫از‬ ‫کی‬ ‫است‬ ‫این‬ ‫در‬ . ‫سعی‬ ‫پژوهش‬ ‫است‬ ‫گردیده‬ ‫کمک‬ ‫به‬ ‫و‬ ‫علمی‬ ‫های‬ ‫روش‬ ‫از‬ ‫استفاده‬ ‫با‬ ‫سازی‬ ‫شبیه‬ ‫کامپیوتر‬ ‫نیروها‬ ‫کاهش‬ ‫برای‬ ‫ی‬ ‫سمت‬ ‫های‬ ‫استم‬ ‫بر‬ ‫وارد‬ ‫ی‬ ‫با‬ ‫بخار‬ ‫و‬ ‫سروموتور‬ ‫استم‬ ‫هندسه‬ ‫سازی‬ ‫بهینه‬ ‫ها‬ ‫محدود‬ ‫اجزا‬ ‫روش‬ ‫به‬ ‫و‬ ‫جریان‬ ‫هندسه‬ ‫سازی‬ ‫بهینه‬ ‫ارتعاشات‬ ‫و‬ ‫نیروها‬ ‫کاهش‬ ‫برای‬ ‫استفاد‬ ‫با‬ ‫ه‬ ‫افزا‬ ‫نرم‬ ‫کمک‬ ‫به‬ ‫محاسباتی‬ ‫سیاالت‬ ‫دینامیک‬ ‫از‬ ‫تجاری‬ ‫ر‬ ‫های‬ ‫حل‬ ‫راه‬ ، ‫برای‬ ‫کاربردی‬ ‫پیشنه‬ ‫اساسی‬ ‫نقص‬ ‫رفع‬ ‫اد‬ ‫بر‬ ‫سپس‬ ‫و‬ ‫روی‬ ‫بر‬ ‫نصب‬ ‫ای‬ ‫آید.‬ ‫در‬ ‫اجرا‬ ‫مرحله‬ ‫به‬ ‫واحدها‬ ‫واژه‬ ‫کلیدی‬ ‫های‬ -‫بخار،‬ ‫کنترل‬ ‫شیرهای‬ ‫شکست‬ ، ‫سازی‬ ‫شبیه‬ ‫کامپیوتری‬ ، ‫عددی‬ ‫حل‬ 1 -‫مقدمه‬ ‫بخار‬ ‫های‬ ‫نیروگاه‬ ‫در‬ ‫ی‬ ‫ی‬ ، ‫مسائل‬ ‫ترین‬ ‫مهم‬ ‫از‬ ‫کی‬ ‫در‬ ‫موضوع‬ ‫این‬ ‫است.‬ ‫برق‬ ‫شبکه‬ ‫فرکانس‬ ‫در‬ ‫بار‬ ‫کنترل‬ ‫نیروگاه‬ ‫توس‬ ‫گ‬ ‫می‬ ‫صورت‬ ‫بخار‬ ‫کنترل‬ ‫شیرهای‬ ‫توسط‬ ‫ی‬ ‫رد.‬ ‫عنوان‬ ‫به‬ ‫بخار‬ ‫کنترل‬ ‫های‬ ‫شیر‬ ‫عملکرد‬ ‫بررسی‬ ‫رو‬ ‫این‬ ‫از‬ ‫این‬ ‫و‬ ‫باشد‬ ‫می‬ ‫توجه‬ ‫مورد‬ ‫نیروگاه‬ ‫حساس‬ ‫اجزای‬ ‫از‬ ‫یکی‬ ‫است.‬ ‫زیادی‬ ‫اهمیت‬ ‫دارای‬ ‫اقتصادی‬ ‫لحاظ‬ ‫از‬ ‫مسئله‬ ‫ی‬ ‫از‬ ‫کی‬ ‫استم(‬ ‫شکست‬ ، ‫توس‬ ‫نیروگاه‬ ‫اساسی‬ ‫مشکالت‬ Stem ) ‫ی‬ ‫ا‬ ‫آن‬ ‫مختلف‬ ‫های‬ ‫واحد‬ ‫در‬ ‫بخار‬ ‫کنترل‬ ‫شیرهای‬ ‫ی‬ ‫ساقه‬ ‫ب‬ ‫است.‬ ‫حدود‬ ‫از‬ ‫پس‬ ، ‫موجود‬ ‫نابراسناد‬ 3 ‫تا‬ 4 ‫گذشت‬ ‫سال‬ ‫و‬ ‫است‬ ‫شده‬ ‫شروع‬ ‫مشکل‬ ‫این‬ ‫ها‬ ‫واحد‬ ‫اولیه‬ ‫اندازی‬ ‫راه‬ ‫از‬ ‫خودکار(‬ ‫خروج‬ ‫موجب‬ ‫بارها‬ Trip ‫های‬ ‫توقف‬ ‫حتی‬ ‫و‬ ) ‫شکست‬ ‫همواره‬ ‫لذا‬ ‫است.‬ ‫گردیده‬ ‫ها‬ ‫واحد‬ ‫مدت‬ ‫طوالنی‬ ‫مورد‬ ‫و‬ ‫مهم‬ ‫مسائل‬ ‫از‬ ‫یکی‬ ‫برق‬ ‫تولید‬ ‫محدودیت‬ ‫و‬ ‫استم‬ ‫برداری‬ ‫بهره‬ ‫در‬ ‫بحث‬ ‫نیروگاه‬ ‫باشد.‬ ‫می‬ ‫متعددی‬ ‫های‬ ‫تیم‬ ‫اند.‬ ‫داشته‬ ‫هایی‬ ‫تحلیل‬ ‫و‬ ‫بررسی‬ ‫مقوله‬ ‫این‬ ‫روی‬ ‫بر‬ ‫دراغ‬ ‫لب‬ ‫تجربی‬ ‫صورت‬ ‫به‬ ‫مشکل‬ ‫کننده‬ ‫ایجاد‬ ‫عوامل‬ ، ‫قبلی‬ ‫کارهای‬ ‫در‬ ‫ولی‬ ‫است‬ ‫شده‬ ‫بررسی‬ ‫مختلف‬ ‫های‬ ‫آزمایش‬ ‫کمک‬ ‫به‬ ‫و‬ ‫علمی‬ ‫های‬ ‫روش‬ ‫از‬ ‫استفاده‬ ‫با‬ ‫گردد‬ ‫می‬ ‫سعی‬ ‫پژوهش‬ ‫این‬ ‫کمک‬ ‫به‬ ‫و‬ ‫سازی‬ ‫مدل‬ ‫راه‬ ، ‫برای‬ ‫کاربردی‬ ‫های‬ ‫حل‬ ‫نقص‬ ‫دو‬ ‫شامل‬ ‫پژوهش‬ ‫این‬ ‫های‬ ‫فعالیت‬ ‫شود.اهم‬ ‫پیشنهاد‬ ‫مذکور‬ ‫است‬ ‫اساسی‬ ‫بخش‬ 1 ) ‫اجزا‬ ‫روش‬ ‫به‬ ‫والو)‬ ‫استم(ساقه‬ ‫هندسه‬ ‫سازی‬ ‫بهینه‬ ( ‫محدود‬ FEM ‫افزار‬ ‫نرم‬ ‫کمک‬ ‫به‬ ) ANSYS 2 ) ‫هندسه‬ ‫سازی‬ ‫بهینه‬ ‫با‬ ‫استم‬ ‫بر‬ ‫وارد‬ ‫های‬ ‫نیرو‬ ‫کاهش‬ ‫محا‬ ‫سیاالت‬ ‫دینامیک‬ ‫از‬ ‫استفاده‬ ‫با‬ ‫جریان‬ ‫سباتی‬ ( CFD ) ‫افزار‬ ‫نرم‬ ‫کمک‬ ‫به‬ FLUENT

Journal of Solid Mechanics, 2016

Australian Journal of Mechanical Engineering, 2018

Journal of Solid Mechanics, 2017

Archive of Mechanical Engineering, 2014

ISRN Mechanical Engineering, 2014

The Scientific World Journal, 2014

Applied and Computational Mechanics, 2017

Journal of Applied Mechanics, 2003

Periodica Polytechnica Mechanical Engineering, 2015

Engineering Solid Mechanics, 2015

In this article, the thick truncated cone shell is divided into disk-layers form with their thick... more In this article, the thick truncated cone shell is divided into disk-layers form with their thickness corresponding to the thickness of the cone. Due to the existence of shear stress in the truncated cone, the equations governing disk layers are obtained based on first shear deformation theory. These equations are in the form of a set of general differential equations. Given that the truncated cone is divided into n disks, n sets of differential equations are obtained. The solution of this set of equations, applying the boundary conditions and continuity conditions between the layers, yields displacements and stresses. The results obtained have been compared with those
obtained through the analytical solution and the numerical solution. For the purpose of the analytical solution, use has been made of matched asymptotic method (MAM) and for the numerical solution, the finite element method (FEM).

Using disk form multilayers, a semi-analytical solution has been derived for determination of dis... more Using disk form multilayers, a semi-analytical solution has been derived for determination of displacements and stresses in a rotating cylindrical shell with variable thickness under uniform pressure. The thick cylinder is divided into disk form layers form with their thickness corresponding to the thickness of the cylinder. Due to the existence of shear stress in the thick cylindrical shell with variable thickness, the equations governing disk layers are obtained based on first-order shear deformation theory (FSDT). These equations are in the form of a set of general differential equations. Given that the cylinder is divided into n disks, n sets of differential equations are obtained. The solution of this set of equations, applying the boundary conditions and continuity conditions between the layers, yields displacements and stresses. A numerical solution using finite element method (FEM) is also presented and good agreement was found.