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Deflection and vibration analysis of a spherical structure using a newly designed spherical super element
, Article ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), 12 November 2010 through 18 November 2010, Vancouver, BC ; Volume 9 , 2010 , Pages 249-256 ; 9780791844465 (ISBN) ; Nasiri Sarvi, M ; Nasiripour, A. A ; Sharif University of Technology
2010
Abstract
The Finite Element Methods (FEM) are important numerical techniques for analysis of physical problems. Quick prediction of dynamic and static response of structures is one of the interests of both industry and scientists. One of the key elements to achieve this goal is 3D super element compatible with regular geometrical configuration by which a series of structures can be analyzed with less time and higher accuracy. In this paper, a newly designed spherical super element is presented. In this super element, the user can enjoy as many numbers of nodes as he wishes and consequently reaches thedesired accuracy and consuming computational time. It can also be used to analyze structures from...
Design and Analysis of Nano Ball Bearing
, M.Sc. Thesis Sharif University of Technology ; Ahmadian, Mohammad Taghi (Supervisor)
Abstract
Nowadays, science of nano technology has been growing quickly in the past decade. Scientists implemented this technology in bioengineering, electronics and medicine extensively. Nano scale engineering is one of the interests of researchers, nano bearing as a nano scale structure and as an important part of nano machining plays an important role in micro and nano devices. The role of nano bearing is to decrease energy dissipation and increase the efficiency of nano machines. The main purpose of this study is to design and analyze an optimized nano ball bearing. In this regard, a new spherical super element is designed and presented. This super element is implemented in simulating the...
Vibration Analysis of Spherical Structures and Open and Closed Rings Made of Functionally Graded Materials Using Spherical and Cylindrical Superelement
, M.Sc. Thesis Sharif University of Technology ; Ahmadian, Mohammad Taghi (Supervisor) ; Firoozbakhsh, Keikhosrow (Co-Advisor)
Abstract
New developments have led to the creation of functionally graded materials which their unique property is continous changing in material properties. The increasing use of these materials has caused a lot of research on various issues related to them. One of the applications is applying these materials in spherical structures and open and closed rings. In mechanical equipment spherical structures and rings are used in various ways. The spherical structures of small parts, such as bearings to large structures such as spherical tanks are used. Due to the rapid growth of technology in the construction of structures of functionally graded materials, analysis of these structures in different...
Thermo-elastic Development of Cylindrical and Spherical Superelements and Introduce a New Gigh Speed Angular Contact Bearing Superelement Model
, M.Sc. Thesis Sharif University of Technology ; Movahhedy, Mohammad Reza (Supervisor)
Abstract
Angular contact bearings are utilized in many industrial types of machinery, including machine tools’ spindle. Spindle is one of the most important parts of a machine tool, which has a substantial impact on dynamic properties and stability of machining processes. Spindles’ motion takes place under guidance of bearings, which are mainly angular contact type. Since bearings’ loading under forces that are resulted from angular velocity and temperature increment are intensified, it is required to control the applied forces in operating situation, in order to predict the hardness, accuracy, efficiency, and life time of spindle. Thus, determining the dynamic performance of machine tool’s spindle,...
Vibrational and Dynamical Analysis of Hollow spheres Using Super Element
, M.Sc. Thesis Sharif University of Technology ; Ahmadiyan, Mohammad Taghi (Supervisor) ; Assempour, Ahmad (Supervisor)
Abstract
In recent years, functionally graded materials (FGMs) has widely used in many industrial products. FGMs are advanced non-homogeneous materials with mechanical and physical properties that vary continuously as a function of position within the materials. The main goal of this project is to study the static behavior and vibrational analysis of the FGMs spherical structures. In this project, the finite element method is used to do static and dynamic analysis of FGM hollow spheres. A new spherical super element has been designed to enhance modeling of hollow spheres and ease the solution of the finite element model. The deformations due to various static loadings are obtained. The natural...
Design and implementation of a new spherical super element in structural analysis
, Article Applied Mathematics and Computation ; Volume 218, Issue 14 , March , 2012 , Pages 7546-7561 ; 00963003 (ISSN) ; Ahmadian, M. T ; Sharif University of Technology
2012
Abstract
Finite Element Method (FEM) has proved to be a powerful tool for the analysis of mechanical problems such as finding natural frequency and deformation of structures. Design and implementation of super elements with a purpose in reduction of computational time along with accuracy is one of the challenges facing engineers in the past decade. In this study a newly spherical super element is designed and implemented to some problems. This element is generated in such a way that the user can select as many numbers of nodes as desired. Proper formulation is presented to generate the shape function for each node in this element. Some examples of static and vibration analysis using this element are...
Design a new spherical super element to static and modal analysis of spherical structures
, Article Proceedings of the ASME Design Engineering Technical Conference, 28 August 2011 through 31 August 2011 ; Volume 1, Issue PARTS A AND B , August , 2011 , Pages 493-497 ; 9780791854785 (ISBN) ; Ahmadian, M. T ; Sharif University of Technology
2011
Abstract
Hollow Spherical Structures such as spherical pressure vessels are widely used in industries. Using faster numerical methods to solve these spherical problems has been one of the research interests in the last decade. Super elements are elements capable of producing the same accurate result in comparison with several conventional elements. In this paper, a new spherical super element is designed and implemented to study the static deformation and modal analysis of a spherical structure. In the static analysis mean of the inner radial displacements of the hollow structure under the internal pressure is evaluated. also performing the modal analysis, natural frequencies of the structure under...
Deformation and stress analysis of the fullerene by super element
, Article ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011 ; Volume 2 , 2011 , Pages 895-900 ; 9780791854884 (ISBN) ; Ahmadian, M. T ; Barari, A ; ASME ; Sharif University of Technology
Abstract
Accurate prediction of static and dynamic response of nano structures is one of the important interests of scientists in the last decade. Nano bearing as an important part of nano machines has been extensively implemented in recognizing and disassembling cancerous cells and building molecular support structures for strengthening bones. For this reason, Molecular Dynamic Method and some experimental methods are implemented in this area. As nano ball bearing is one of the most important components of nano machines, a large number of studies are concentrated to analyze it statically and dynamically. In this paper, a Fullerene is simulated by a spherical super element whose stress, deformation...
Deformation, stress and natural frequency analysis of the fullerene by finite super element method
, Article Proceedings of the ASME Design Engineering Technical Conference, 28 August 2011 through 31 August 2011 ; Volume 7 , August , 2011 , Pages 153-158 ; 9780791854846 (ISBN) ; Ahmadian, M. T ; Sharif University of Technology
2011
Abstract
Accurate prediction of static and dynamic response of nano structures is one of the important interests of scientists in the last decade. Nano bearing as an important part of nano machines has been extensively implemented in recognizing and disassembling cancerous cells and building molecular support structures for strengthening bones. For this reason, Molecular Dynamic Method and some experimental methods are implemented in this area. As nano ball bearing is one of the most important components of nano machines, a large number of studies are concentrated to analyze it statically and dynamically. In this paper, a Fullerene is simulated by a spherical super element whose stress, deformation...
Application of a new spherical super element in predicting the deformation of biological cells in microinjection
, Article Proceedings of the ASME Design Engineering Technical Conference, 28 August 2011 through 31 August 2011 ; Volume 7 , August , 2011 , Pages 41-49 ; 9780791854846 (ISBN) ; Ahmadian, M. T ; Sharif University of Technology
2011
Abstract
Biological cell injection is a sensitive and important work which is implemented in injection of foreign materials into individual cells. Microinjection is significantly developed in the field of drug discovery and genetics so predicting the behavior of cell in microinjection is remarkably important because a tiny excessive manipulation force can destroy the tissue of the biological cell. There are a few analytical methods available to simulate the cell injection, hence the numerical methods such as FEM are suitable to be used to model the microinjection. In this study, a new spherical super element is presented to model the biological cells and deformation of a specific cell under an...
Comparison of deformation analysis of a biological cell under an injection force using analytical, experimental and finite element methods and Artificial Neural Network
, Article ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011 ; Volume 2 , 2011 , Pages 499-507 ; 9780791854884 (ISBN) ; Ahmadian, M. T ; ASME ; Sharif University of Technology
Abstract
Biological cell injection is a sensitive and important work which is implemented in injection of foreign materials into individual cells. Microinjection is significantly developed in the field of drug discovery and genetics so predicting the behavior of cell in microinjection is remarkably important because a tiny excessive manipulation force can destroy the tissue of the biological cell. There are a few analytical methods available to simulate the cell injection, hence the numerical methods such as FEM are suitable to be used to model the microinjection. In this study, a new spherical super element is presented to model the biological cells and deformation of a specific cell under an...