نتایج جستجو برای: thin shell cylindrical resonator

تعداد نتایج: 209527  

Journal: :Transactions of the Japan Society of Mechanical Engineers 1968

2003
G. W. Hunt G. J. Lord

A hypothesis for the prediction of the circumferential wavenumber of buckling of the thin axially-compressed cylindrical shell is presented, based on the addition of a length effect to the classical (Koiter circle) critical load result. Checks against physical and numerical experiments, both by direct comparison of wavenumbers and via a scaling law, provide strong evidence that the hypothesis i...

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...

Abdolhossein Fereidoon Amin Akbarpour Kamal Kolasangiani Mahmoud Shariati

In this paper, simulation and analysis of thin steel cylindrical shells with elliptical cutouts under oblique loading were studied using finite element method. First, the numerical results were validated by the results of experimental test performed by an INSTRON 8802 servo hydraulic machine. Also, the effect of cutout angle (θ), cutout size, cutout position (L0/L) and cutout aspect ratios (b/a...

2014
Amit Kumar

Objective of this study is to enhance radius of curvature of return loss, input impedance & explore SWR and radiation pattern. Hollow CDRA has been used instead of single-element CDRA to achieve the above mentioned goal. The impedance bandwidth of a high permittivity hollow cylindrical dielectric resonator antenna excited by micro-strip lines was significantly improved by modifying the feed geo...

2017
Jason W. Sidabras Edward J. Reijerse Wolfgang Lubitz

Uniform field (UF) resonators create a region-of-interest, where the sample volume receives a homogeneous microwave magnetic field (B1) excitation. However, as the region-of-interest is increased, resonator efficiency is reduced. In this work, a new class of uniform field resonators is introduced: the uniform field reentrant cylindrical TE01U cavity. Here, a UF cylindrical TE01U cavity is desig...

2007
Z. G. Wei R. C. Batra

The dynamic plastic buckling of a homogeneous and isotropic thin thermoviscoplastic cylindrical shell loaded radially is studied analytically by analyzing the stability of its stressed/deformed configuration under superimposed infinitesimal perturbations. The wave number of the perturbation that maximizes its initial growth rate is assumed to determine the buckling mode. Cubic algebraic equatio...

Journal: :Mathematical Modelling and Numerical Analysis 2021

We consider a perforated half-cylindrical thin shell and investigate the limit behavior when period thickness simultaneously go to zero. By using decomposition of displacements presented in Griso [ JMPA 89 (2008) 199–223] we obtain priori estimates. With unfolding rescaling operator transform problem reference configuration. In end this yields homogenized for shell.

Journal: :نشریه دانشکده فنی 0
محمد رضایی پژند رضا خواجوی

curls and curves of a shell interweave its various strain modes and link them together. this interactional behavior has yet frustrated all attempts for the construction of shell templates, which needs for an individual element test in traditional approaches. such a test fails to work for shell elements and must be reconstructed. in this paper, it is tried to study shell interactional behavior a...

F Mokhtari Y Tadi Beni,

In this paper, vibration of the protein microtubule, one of the most important intracellular elements serving as one of the common components among nanotechnology, biotechnology and mechanics, is investigated using stress and strain gradient elasticity theory and orthotropic elastic shells model. Microtubules in the cell are influenced by internal and external stimulation and play a part in con...

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