S.M.M. Najafizadeh
Associate Prof., Department of Mechanical Engineering, Arak Branch, Islamic Azad University, Arak, Iran
[ 1 ] - Buckling Analysis of Cylindrical Grooved Shell under Axial Load Discs
In this paper, buckling of cylindrical grooved shells under axial load has been examined by theoretical and experimental methods. The shell is made of USA/API – X42 5L steel standards. This material is one of the most common materials used in gas, oil and petrochemical industries. The effect of spiral grooves on cylindrical shell was analyzed, and the results obtained from the Abaqus software w...
[ 2 ] - Experimental and Numerical Analysis of the Critical Buckling Load of Cracked Sheets
Collapse by buckling a quite common phenomenon in sheets under pressure. When these structures caused by defects such as corrosion and cracks the time of the occurrence of this phenomenon is sensitive and critical load to be significantly reduced. Therefore, in this article sheet of aluminum Al 1200 by cracks in a part of the sheet will be considered. Left angle on the critical buckling load ef...
[ 3 ] - Thermal Buckling Analysis of Circular FGM Plate with Actuator/Actuator Piezoelectric Layer Based on Neutral Plane
In this paper, the thermal buckling analysis of a circular plate made of FGM materials with actuator/actuator piezoelectric layers based on neutral plane, classical plate theory and first order shear deformation plate theory is investigated. Reddy's model is assumed for material properties of FGM plate. Plate under the thermal loading, nonlinear temperature rise through the thickness and clampe...
[ 4 ] - The new version of Differential Quadrature Buckling Analyses of FGM Rectangular Plates Under Non-Uniform Distributed In-Plane Loading
In this paper the buckling coefficient of FGM rectangular plates calculated by the new version of differential quadrature method (DQM). At the first the governing differential equation for plate has been calculated and then according to the new version of differential quadrature method (DQM) the existence derivatives in equation , convert to the amounts of function in the grid points inside of ...
[ 5 ] - Bending Analysis of Rectangular FGM Plates based on the Extended Kantorovich Method
Bending analysis of FGM plates under uniform and sinusoidal loaded result in forth order partial differential equation. In this paper the analytical solution is based on the extended Kantorovich iterative procedure. The differential equations for the iterative procedure is derived using the Galerkin method. The solution was develope based on the classical plate’s theory (CLPT). The reliability ...
[ 6 ] - اثر جت هیدرولیکی هم فاز بر کاهش آبشستگی در قوس 180 درجه رودخانه‌ها
در این تحقیق اثر جت هیدرولیکی هم فاز بر کاهش آبشستگی در قوس رودخانه ها بررسی شد. در روش مورد نظر یک لوله روزنه دار در امتداد قوس و نزدیک به دیواره بیرونی روی بستر قرار گرفته و از دو انتهای لوله فشار آب، به جریان درون قوس تزریق می شود. هدف اصلی از این پژوهش ایجاد یک صفحه آبی در مقابله با جریان ثانویة ایجاد شده در قوس و ممانعت از رسیدن آن به ساحل خارجی می باشد. نتایج نشان داد، محل وقوع ماکزیمم عم...
[ 7 ] - Vibration Analysis of FG Nanoplate Based on Third-Order Shear Deformation Theory (TSDT) and Nonlocal Elasticity
In present study, the third-order shear deformation theory has been developed to investigate vibration analysis of FG Nano-plates based on Eringen nonlocal elasticity theory. The materials distribution regarding to the thickness of Nano-plate has been considered based on two different models of power function and exponential function. All equations governing on the vibration of FG Nano-plate ha...
[ 8 ] - Application of Evolutionary Algorithm to Optimization of ANNIS Model for Discharge Coefficient Circular Side Spillway Modeling
In this study, the discharge coefficient of the circular side orifices was predicted using a new hybrid method. Combinations made in this study were divided into two sections: 1) the combination of two algorithms including Particle Swarm Optimization (PSO) and Genetic Algorithm (GA) and providing the PSOGA algorithm 2) using the PSOGA algorithm in order to optimize the Adaptive Neuro Fuzzy Infe...
[ 9 ] - تغییرات اقلیمی بر دما، بارش و رواناب حوضه درودززن استان فارس با استفاده از رویکرد میانگین گروهی چند تشبیهی
در این مطالعه اثر تغییرات اقلیمی بر دما، بارندگی و رواناب در حوضه درودزن در شمال شرق استان فارس بررسی شده است. تغییرات دما و بارندگی در دو دوره آتی میانی و دور با استفاده از مدل 15 مدل گردش عمومی جو فاز 3 (CMIP3) ، تحت سه سناریو انتشار گازهای گلخانه ای A2، B1 و A1B ، ریز مقیاس نمای شده و مورد مطالعه قرار گرفت. تفاوت در میزان تغییرات دما و بارندگی در این دو دوره نسبت به مقادیر مشاهداتی در 15 مدل...
[ 10 ] - Development of a Practical Model for Optimizing Surge Tanks and Air Chambers in Water Transmission Systems
Surge tanks and air chambers are the most useful solution to deal with water hammer in water transmission systems (WTS). The optimal design of these protective devices can be effective in reducing the costs of constructing and operating a water transmission system. In this article, some software with the capability of simulating and optimizing these protective equipment is presented. To simulat...
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