نتایج جستجو برای: cylindrical punches

تعداد نتایج: 25696  

2006
A. Vaziri

Linear eigenvalue analysis of cracked cylindrical shells under combined internal pressure and axial compression is carried out to study the effect of crack type, size and orientation on the buckling behavior of cylindrical thin shells. Two types of crack are considered; through crack and thumbnail crack. Our calculations indicate that depending on the crack type, length, orientation and the int...

2015
Yan Qu Wencan Peng Chenjiang Guo Jun Ding

As the important case of conformal arrays, conformal arrays on cylindrical surfaces have been widely used in radar and communication systems. This paper explores the chances of designing conformal reflectarray on cylindrical platform. An extended array theory method is proposed in this paper for analyzing the radiation patterns of cylindrical conformal reflectarray. The radiation characteristic...

ژورنال: :فصلنامه علمی پژوهشی مهندسی مکانیک جامدات واحد خمینی شهر 0
امین رحمت نژاد دانشجوی کارشناسی ارشد، دانشکده مکانیک، دانشگاه آزاد اسلامی واحد اراک محمد مهدی نجفی زاده دانشیار، دانشکده مکانیک، دانشگاه آزاد اسلامی واحد اراک حمید محسنی منفرد دانشیار، دانشکده مکانیک ، دانشگاه آزاد اسلامی واحد اراک

در این مقاله کمانش پوسته­های استوانه­ای شیار دار تحت بار محوری به روش تئوری و آزمایشگاهی مورد بررسی قرار گرفته است. پوسته ها از جنس فولاد با استاندارد (usa/api – x42 5l)در نظر گرفته شده­اند که یکی از پرکاربرد ترین مواد استفاده شده در صنایع گاز، نفت و پتروشیمی می باشند. اثر شیار مارپیچ برروی پوسته استوانه ای مورد تحلیل قرار گرفته است و در ادامه نتایج به دست آمده از نرم افزار abaqusبا نتایج آزمای...

2017
Tarik Viehmann Gereon Kremer Erika Ábrahám

Satisfiability-modulo-theories (SMT) solving is a technique to check the satisfiability of logical formulas. In the context of SMT solving for non-linear real arithmetic, the cylindrical algebraic decomposition (CAD) can be embedded as a theory solver to solve sets (conjunctions) of polynomial constraints. When developing such a CAD theory solver, a design choice is given by the selection of th...

   This paper deals with the development and modeling of cylindrical contact theories and also the simulation of contact forces to be applied in the manipulation of various biological micro/nanoparticles by means of the AFM. First, the simulation of contact forces in four environments has been carried out, which are the most commonly used fluid in biomanipulation. Then, the spherical and cy...

2018
Yifang Xu Jing Chen Tianli Liao

A novel warp for natural image stitching is proposed that utilizes the property of cylindrical warp and a horizontal pixel selection strategy. The proposed ratio-preserving halfcylindrical warp is a combination of homography and cylindrical warps which guarantees alignment by homography and possesses less projective distortion by cylindrical warp. Unlike previous approaches applying cylindrical...

2008
Hai-Hong Sun Pao-Lin Tan

Cylindrical shells, unstiffened or stiffened with rings and/or stringers are commonly used in offshore structures as main loading-carrying members. Comprehensive theoretical work and experimental studies on the buckling behavior of cylindrical shells have been carried out in the past. The increasing offshore application of stiffened cylindrical shells has raised some new challenges that need to...

Journal: :international journal of nanoscience and nanotechnology 2014
a. h. korayem a. k. hoshiar n. n. ashtiani m. h. korayem

with the rise in the use of afm (atomic force microscope), we have witnessed a growing use of atomic microscope based nanorobots in the precise displacement of various particles. there are certain limitations to the application of nanorobots in the moving of nanoparticles. one of the most important of these limitations is the lack of an appropriate image feedback concurrent with the displaci...

Journal: :international journal of nano dimension 0
s. saber samandari new technologies research centre, amirkabir university of technology, tehran, po box 1591633311, iran.

a new three-dimensional unit cell model has been developed for modeling three constituent phases including inclusion, interphase and matrix. the total elastic modulus of nano-composite is evaluated.  numerical results are in good agreement with the previous proposed theoretical modeling. higher matrix and inclusion elastic modulus both can dramatically influence the total elastic modulus.

Journal: :amirkabir international journal of electrical & electronics engineering 2015
r. khosravi s. h. sadeghi r. moini

the produced electric and magnetic fields due to lightning strikes to mountainous ground are determined in this paper. for the sake of simplicity a cone-shaped ground with finite conductivity is assumed to represent a natural nonflat ground. by this assumption, we deal with an axillary symmetrical structure so we use the cylindrical 2d-fdtd to save the simulation memory and time, dramatically. ...

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