Some free vibration problems of multi-layer composite 'shallow' and 'full' circular cylindrical shells (--bonded lap joints and/or bonded stiffening shell strips (or segments) in aero-structures--). Ömer Varlık Özerciyes, supervisor Prof. Dr. Umur Yüceoğlu

Vibration isolation of inertial measurement unit Çınarel, Dilara; Ciğeroğlu, Ender; Department of Mechanical Engineering (2012) Sensitive devices are affected by extreme vibration excitations during operation so require isolation from high levels of vibration excitations. When these excitation characteristics of the devices are well known, the vibration isolation can be achieved accurately. However, it is possible to have expected profile information of the excitations with respect to frequency. Therefore, it is practical and useful to implement this information in the design process for vibration isolation. In this thesis, passive ...
Design and economical evaluation of sucker rod and electrical submersible pumps : oil wells in a field, Turkey Ceylan, Sevil Ezgi; Gümrah, Fevzi; Department of Petroleum and Natural Gas Engineering (2004) There are some alternatives of artificial lift methods to increase the production of oil well or to keep it producing. Sucker rod pumping (SRP) and electrical submersible pumping (ESP) systems are selected for the design and economical evaluation of thirteen oil wells of R field. Although selected wells are already producing artificially, they are redesigned for SRP and ESP. LoadCalC software developed by Lufkin and SubPUMP developed by DSSC are used for SRP and ESP designs respectively. For economic evalua...
Evaluation of a new turbulence model for boundary layer flows with pressure gradient Marangoz, Alp; Çıray, Cahit; Department of Aerospace Engineering (2005) In this thesis, a new turbulence model developed previously for channel and flat plate flows is evaluated for flat plate flows with pressure gradient. For this purpose a flow solver, which uses boundary layer equations as the governing equations and Von Karman momentum integral equation for the calculation of skin friction, is developed. It is shown that the error of the new turbulence model, in predicting the velocity profile, is less than 5 % for the flat plate flows without pressure gradient and less tha...
A layerwise approach to modeling piezolaminated plates Ertürk, Cevher Levent; Tekinalp, Ozan; Department of Aerospace Engineering (2005) In this thesis, optimal placement of adhesively bonded piezoelectric patches on laminated plates and the determination of geometry of the bonding area to maximize actuation effect are studied. A new finite element model, in which each layer is considered to be a separate plate, is developed. The adhesive layer is modeled as a distributed spring system. In this way, relative transverse normal and shear motion of the layers are allowed. Effect of delamination on the adhesive layer stresses is also studied and...
Navigation algorithms and autopilot application for an unmanned airvehicle Kahraman, Eren; Alemdaroğlu, Hüseyin Nafiz; Nalbantoğlu, Volkan; Department of Aerospace Engineering (2010) This study describes the design and implementation of the altitude and heading autopilot algorithms for a fixed wing unmanned air vehicle and navigation algorithm for attitude and heading reference outputs. Algorithm development is based on the nonlinear mathematical model of Middle East Technical University Tactical Unmanned Air Vehicle (METU TUAV), which is linearized at a selected trim condition. A comparison of nonlinear and linear mathematical models is also done. Based on the linear mathematical model...

Citation Formats

Ö. V. Özerciyes, “Some free vibration problems of multi-layer composite ‘shallow’ and ‘full’ circular cylindrical shells (--bonded lap joints and/or bonded stiffening shell strips (or segments) in aero-structures--). Ömer Varlık Özerciyes, supervisor Prof. Dr. Umur Yüceoğlu,” Ph.D. - Doctoral Program, Middle East Technical University, 2002.