Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Modeling and experimental verification of dynamic characteristics antenna structure under mechanical shock using MDOF model
Download
index.pdf
Date
2015
Author
Özçelik, Yunus Emre
Metadata
Show full item record
Item Usage Stats
259
views
459
downloads
Cite This
Antenna structures used in electronic warfare, radar, naval, satellite, spacecraft systems encounter mechanical shock from various sources such as near miss under water explosion, pyrotechnic and ballistic shocks. Since most antenna structures have larger dimension in longitudinal direction and experience high requency, high amplitude shock energy, geometric nonlinearity becomes crucial to predict dynamic behavior in real life. In this thesis, an antenna structure is modeled by Euler-Bernoulli beam theory including geometrical and inertia nonlinearities. The resulting partial differential equations of motions are converted into a set of nonlinear ordinary differential equations (ODEs) by using Galerkin’s Method, which are solved by Newmark and Backward Euler time integration methods. The results for the linear system obtained from time integration and approximate methods such as Absolute Method, Square Root of Sum of Squares (SRSS), Naval Research Method, Combined Quadratic Combination (CQC) and Shock Response Spectrum Method (SRS) are compared to the nonlinear ones. Moreover, these results are compared with the ones obtained from commercial Finite Element software as well as experimental results from a drop test table.
Subject Keywords
Antennas (Electronics).
,
Shock (Mechanics).
,
Nonlinear theories.
,
Finite element method.
URI
http://etd.lib.metu.edu.tr/upload/12619716/index.pdf
https://hdl.handle.net/11511/25402
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Shock Response of an Antenna Structure Considering Geometric Nonlinearity
Ozcelik, Yunus Emre; Ciğeroğlu, Ender; Çalışkan, Mehmet (2016-01-28)
Antenna structures used in electronic warfare, radar, naval, satellite, spacecraft systems encounter mechanical shock from various sources such as near miss under water explosion, pyrotechnic and ballistic shocks. Since most of the antenna structure has larger dimension in longitudinal direction and experience high frequency, high amplitude shock energy, geometric nonlinearity become crucial to predict dynamic behavior in real life. In this study, the antenna structure is modeled by Euler-Bernoulli beam the...
Shock analysis of an antenna structure subjected to underwater explosions
Demir, Mehmet Emre; Çalışkan, Mehmet; Department of Mechanical Engineering (2015)
Antenna structures constitute main parts of electronic warfare systems. Mechanical design is as crucial as electromagnetic design of antenna structures for proper functioning and meeting high system performance needs. Failure of mechanical and electronic structures operating under shock loading is a common occurrence in naval electronic warfare applications. A complete shock analysis of the dipole antenna structure subjected to underwater explosions is performed to foresee adverse effects of mechanical shoc...
Design and analysis of radar antenna structure with optimum dynamic behavior
Sun, Enver; Özgen, Gökhan Osman; Yaman, Yavuz; Department of Mechanical Engineering (2016)
With the advance of technology the radar antenna structures are being smaller and their design alternatives are quite numerous that they can be produced in different shapes and can be conformed to original structures such as body panel of an aircraft or car which are composed of light weight thin shell structures. Radar antennas as an integral part of the air or ground vehicles are subjected to various dynamic loadings which effects its overall radiation pattern which results overall degradation of antenna ...
Comparison of Outer Rotor Radial Flux and Axial Flux PM Motors for CMG Application
Ertan, Hulusi Bülent (2014-09-05)
Control moment gyroscopes (CMG) are used in modern satellite applications for attitude control of satellites. The volume and mass of the instruments is very important in such applications. In this context, integrating the mass of the CMG, on the stator of the motor, promises to save space and mass. Radial-flux outer-rotor motor is a promising configuration in that respect. In this paper, using such a PM motor is considered for control moment gyroscope applications. The design of the motor must be made such ...
Design of an irradiation test facility for space applications
Kızılören, Dilek; Demirköz, Melahat Bilge; Department of Physics (2014)
Space radiation damages electronic components of spacecraft. Damages are due to cosmic rays which consist of protons, photons, electrons, and heavy nuclei. Function- ality and performance of the electronic components in flight depend on the orbital pa- rameters of spacecrafts and exposure time. The space radiation causes three types of effects and these are categorized as Single Event Effects (SEEs), Total Ionizing Dose (TID) Effects and Non-Ionizing Dose Displacement Damage Effects. Radiation hard- ness ass...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
Y. E. Özçelik, “Modeling and experimental verification of dynamic characteristics antenna structure under mechanical shock using MDOF model,” M.S. - Master of Science, Middle East Technical University, 2015.
