نتایج جستجو برای: model simulation

تعداد نتایج: 2453979  

Journal: :international journal of advanced design and manufacturing technology 0
amir hossein shirani mohsen lohmousavi mehdi akhbari

abstract: in this paper, the results of experimental and numerical simulation of low velocity impact process have been carried out to investigate energy absorption of composite sandwich panels with 3d woven fabrics of glass fibers and epoxy resin. for this purpose, diagrams of force-displacement of the quasi-static and quasi-dynamic impact tests were studied. for the finite element simulation, ...

Journal: :journal of biomedical physics and engineering 0
y bazargan-lari department of mechanical engineering, college of mechanical and aerospace engineering, tehran science and research branch, islamic azad university, tehran, iran m eghtesad shiraz university a khoogar department of mechanical engineering, maleke-ashtar university of technology,lavizan,tehran, iran a mohammad-zadeh department of mechanical engineering, college of mechanical and aerospace engineering,tehran science and research branch, islamic azad university, tehran, iran

background: despite some successful dynamic simulation of self-impact double pendulum (sidp)-as humanoid robots legs or arms- studies, there is limited information available about the control of one leg locomotion. objective   : the main goal of this research is to improve the reliability of the mammalians leg locomotion and building more elaborated models close to the natural movements, by mod...

Introduction: Breast cancer is a cancer that is caused by abnormal growth of breast cells. Modeling  and simulation of the growth and treatment of breast cancer, along with providing the possibility of doing experiments and research, can reduce the time and cost of treatment by predicting some cases. The purpose of the present research was to develop an agent-based model for the simulation of b...

Journal: :international journal of mathematical modelling and computations 0
nouredin parandin http://iauksh.ac.ir islamic azad university iran, islamic republic of department of mathematics. somayeh ezadi

in this paper, we introduce a hybrid approach based on neural network and optimization teqnique to solve ordinary differential equation. in proposed model we use heyperbolic secont transformation function in hiden layer of neural network part and bfgs teqnique in optimization part. in comparison with existing similar neural networks proposed model provides solutions with high accuracy. numerica...

Journal: :international journal of civil engineering 0
r. abbasnia department of civil engineering, iran university of science and technology, tehran 16844, iran m. aslami research assistant

a new model is proposed for two-dimensional simulation of the concrete fracture in compression. the model generated by using the voronoi diagram method and with considering random shape and distribution of full graded aggregates at the mesoscopic level. the aggregates modeled by combining irregular polygons, which then is placed into the concrete with no intersection between them. by this new m...

Journal: :مدیریت آب و آبیاری 0
محمدرضا گودرزی دانشجوی دکتری مهندسی عمران - آب، دانشکده عمران، دانشگاه علم و صنعت ایران، تهران - ایران باقر ذهبیون استادیار دانشکده عمران، دانشگاه علم و صنعت ایران، تهران - ایران علی رضا مساح بوانی استادیار گروه مهندسی آبیاری و زهکشی، پردیس ابوریحان، دانشگاه تهران، پاکدشت - ایران علی رضا کمال کارشناس ارشد مهندسی منابع آب، گروه مهندسی آبیاری و زهکشی، پردیس ابوریحان، دانشگاه تهران، پاکدشت - ایران

nowadays protecting land cover, quality and quantity of water resources are important. surface runoff is one of most important reasons of soil erosion which causes sediment in reservoirs and reduction of land’s fertility and also quality reduction water of rivers. so the main issue is exact prediction of basin runoff to raining events. the hydrologic models are simplified models of real hydrolo...

Journal: :پژوهش آب در کشاورزی 0

water balance components are difficult to measure in short intervals because their measurement is time consuming and costly. therefore, soil-water--plant models can be used for prediction of these components. in this study, to predict grain yield and evaluate water use efficiency, an agro-hydrological model, namely, swap was used. this study covered a 10-years period from 2000-2010. based on th...

Journal: :مکانیک سیالات و آیرودینامیک 0
نیما سام خانیانی محمدرضا انصاری

in this paper, direct numerical simulation of two-phase incompressible gas-liquid flow for simulation of bubble motion in a microtube is presented. microtube radius is 10 µm. the interface is tracked using volume of fluid (vof) method with continuous surface force (csf) model. the flow is solved using a finite volume scheme, based on piso algorithm. numerical simulation is performed on a axisym...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2008
ali dashti ahmad ramazani s.a.

a new model based on a combination of the polymeric multigrain and multilayer models has been developed to predict the polymerization rate, particle growth, morphology, effective parameters on broadening of the molecular weight distribution, number and weight average of the molecular weight, isotacticity index and bulk density of polymer. mathematical correlations and the kinetics used in this ...

Journal: :مهندسی بیوسیستم ایران 0
حسن صدرنیا استادیار، دانشگاه فردوسی مشهد باقر عمادی استادیار، دانشگاه فردوسی مشهد علی رجبی پور دانشیار، دانشگاه تهران جوس دی. بیاردمکر استاد، دانشگاه کاتولیک لوون بلژیک

large sums of fruits are annually wasted due to mechanical damage and bruise inflicted upon them during harvesting, handling, storage and packaging. the research which has been done to analyze the mentioned processes mostly used practical operational techniques with the results being applicable in certain defined conditions. the aim of this research was to develop computer models for an optimiz...

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