نتایج جستجو برای: انالیز finite element

تعداد نتایج: 393932  

Journal: :journal of computational applied mechanics 0
masoud sharififar school of metallurgy and material engineering, college of engineering, university of tehran, tehran, iran s. ali asghar akbari mousavi school of metallurgy and material engineering, college of engineering, university of tehran, tehran, iran.

rectangular waveguide (wr) is one of the earliest types of transmission lines. rectangular waveguide can be produced by hot extrusion process. in this paper, the hot extrusion process of cuzn5 rectangular waveguide was investigated by finite element method (fem). in addition, genetic algorithm method (ga) was used to optimize the die geometry and process conditions to achieve the lowest magnitu...

Journal: :journal of agricultural science and technology 2010
sh. rafiee m. kashaninejad a. r. keyhani a. jafari

drying is an important operational step in pistachio processing. there is a decrease in moisture content of pistachio nuts from 56-57% (d.b.) to 5-6% during the drying process. drying conditions affect the quality of dried pistachio nuts, therefore, this calls for an accurate description of the drying trend in the process. in this study finite element formulation and solution of diffusive moist...

Journal: :journal of structural engineering and geo-techniques 2012
o barani

buckle folds are common traps for hydrocarbon in several contractional provinces. buckle folds form where stratified sequences rest a top salt or some other utterly weak rock as a decollemet zone in units with high competency contrasts by a compressive stress which acted along the length of the rock layers. an important parameter affecting buckle folding of a competent zone above a mobile decol...

Journal: :journal of optimization in industrial engineering 2013
moharam h. korayem mostafa nazemizadeh hamed rahimi nahooji

in this paper, finding dynamic load carrying capacity (dlcc) of flexible link manipulators in point to-point motion was formulated as an optimal control problem. the finite element method was employed for modelling and deriving the dynamic equations of the system. the study employed indirect solution of optimal control for system motion planning. due to offline nature of the method, many diffic...

Journal: :international journal of civil engineering 0
jafar najafizadeh no. 21, arghavan st., north dibajee, farmanieh, tehran, islamic republic of iran mohsen kamalian no. 21, arghavan st., north dibajee, farmanieh, tehran, islamic republic of iran mohammad kazem jafari no. 21, arghavan st., north dibajee, farmanieh, tehran, islamic republic of iran naser khaji faculty of civil and environmental engineering, tarbiat modares university

in this paper, an advanced formulation of the spectral finite element method (sfem) is presented and applied in order to carry out site response analysis of 2d topographic structures subjected to vertically propagating incident in-plane waves in time-domain. the accuracy, efficiency and applicability of the formulation are demonstrated by solving some wave scattering examples. a numerical param...

Journal: :international journal of civil engineering 0
khaled farah national engineering school of tunis mounir ltifi national engineering school of tunis tarek abichou florida state university hedi hassis national engineering school of tunis

the purpose of this study is to compare the results of different probabilistic methods such as the perturbation method, stochastic finite element method (sfem) and monte carlo method. these methods were used to study the convergence of direct approach for slope stability analysis and are developed for a linear soil behavior. in this study, two dimensional random fields are used and both the fir...

Journal: :journal of dental biomaterials 0
iman zarei department of mechanical engineering, collage of engineering, shiraz branch, islamic azad university , shiraz, iran salar khajehpour department of mechanical engineering, collage of engineering, shiraz branch, islamic azad university , shiraz, iran abbas sabouri department of prosthodontics, school of dentistry, shiraz university of medical sciences, shiraz, iran. abdol aziz haghnegahdar department of oral and maxillofacial radiology, school of dentistry, shiraz university of medical sciences, shiraz, iran karim jafari department of prosthodontics, school of dentistry, ardabil university of medical sciences, ardabil, iran.

statement of problem: impacts and accidents are considered as the main fac- tors in losing the teeth, so the analysis and design of the implants that they can be more resistant against impacts is very important. one of the important nu- merical methods having widespread application in various fields of engineering sciences is the finite element method. among its wide applications, the study of ...

Journal: :polyolefins journal 2015
marzieh nouri mahmoud parvazinia hassan arabi mohsen najafi

a two-dimensional (2d) single particle model for the copolymerization of propylene-ethylene with heterogeneous ziegler-natta catalyst is developed. the model accounts for the effects of the initial shape of the catalyst and carck/ pore patterns on the copolymer composition, polymerization rate and the average molecular weight properties. the spherical and oblate ellipsoidal shapes of catalyst p...

Journal: :iranian journal of radiation research 0
m. zehtabian medical radiation department and medical imaging research center, school of engineering, shiraz university, shiraz, iran r. faghihi medical radiation department and medical imaging research center, school of engineering, shiraz university, shiraz, iran m.a. mosleh-shirazi center for research in medical physics and biomedical engineering and physics unit, radiotherapy department, namazi hospital, shiraz university of medical sciences, shiraz, iran a.r. shakibafard radiology department, shiraz university of medical sciences, shiraz, iran m. mohammadi medical physics department, royal adelaide hospital, adelaide, australia m. baradaran-ghahfarokhi medical physics and medical engineering department, school of medicine, isfahan university of medical sciences, isfahan, iran

background: the aim of this work was to study the feasibility of constructing a fast thorax model suitable for simulating lung motion due to respiration using only one ct dataset. materials and methods: for each of six patients with different thorax sizes, two sets of ct images were obtained in single-breath-hold inhale and exhale stages in the supine position. the ct images were then analyzed ...

Journal: :journal of modern processes in manufacturing and production 2013
vahid rikhtehgar nezami behrooz zareh abbas vafaee sefat

in recent years, in order to reducing die design and manufacturing costs, multi point forming technique has gained an increasing interest because of its high flexibility. in this process, the conventional fixed shape solid die sets are replaced with a pair of opposite matrices of controllable elements. in this paper, the fundamental principles of multi-point forming was described and the possib...

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