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You searched for +publisher:"Georgia Tech" +contributor:("Khalid, Adeel"). Showing records 1 – 3 of 3 total matches.

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Georgia Tech

1. Gündüz, Mustafa Emre. Software integration for automated stability analysis and design optimization of a bearingless rotor blade.

Degree: PhD, Aerospace Engineering, 2010, Georgia Tech

The concept of applying several disciplines to the design and optimization processes may not be new, but it does not currently seem to be widely accepted in industry. The reason for this might be the lack of well-known tools for realizing a complete multidisciplinary design and analysis of a product. This study aims to propose a method that enables engineers in some design disciplines to perform a fairly detailed analysis and optimization of a design using commercially available software as well as codes developed at Georgia Tech. The ultimate goal is when the system is set up properly, the CAD model of the design, including all subsystems, will be automatically updated as soon as a new part or assembly is added to the design; or it will be updated when an analysis and/or an optimization is performed and the geometry needs to be modified. Such a design process takes dramatically less time to complete; therefore, it should reduce development time and costs. The optimization method is demonstrated on an existing helicopter rotor originally designed in the 1960's. The rotor is already an effective design with novel features. However, application of the optimization principles together with high-speed computing resulted in an even better design. The objective function to be minimized is related to the vibrations of the rotor system under gusty wind conditions. The design parameters are all continuous variables. Optimization is performed in a number of steps. First, the most crucial design variables of the objective function are identified. With these variables, Latin Hypercube Sampling method is used to probe the design space of several local minima and maxima. After analysis of numerous samples, an optimum configuration of the design that is more stable than that of the initial design is reached. The process requires several software tools: CATIA as the CAD tool, ANSYS as the FEA tool, VABS for obtaining the cross-sectional structural properties, and DYMORE for the frequency and dynamic analysis of the rotor. MATLAB codes are also employed to generate input files and read output files of DYMORE. All these tools are connected using ModelCenter. Advisors/Committee Members: Schrage, Daniel (Committee Chair), Bauchau, Olivier (Committee Member), Costello, Mark (Committee Member), Khalid, Adeel (Committee Member), Sankar, Lakshmi (Committee Member).

Subjects/Keywords: Design optimization; Software integration; CAD; Multidisciplinary; Vibration; Bearingless rotor; Rotors (Helicopters); Rotors (Helicopters)Design; Vibration (Aeronautics)

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APA (6th Edition):

Gündüz, M. E. (2010). Software integration for automated stability analysis and design optimization of a bearingless rotor blade. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/33916

Chicago Manual of Style (16th Edition):

Gündüz, Mustafa Emre. “Software integration for automated stability analysis and design optimization of a bearingless rotor blade.” 2010. Doctoral Dissertation, Georgia Tech. Accessed December 11, 2019. http://hdl.handle.net/1853/33916.

MLA Handbook (7th Edition):

Gündüz, Mustafa Emre. “Software integration for automated stability analysis and design optimization of a bearingless rotor blade.” 2010. Web. 11 Dec 2019.

Vancouver:

Gündüz ME. Software integration for automated stability analysis and design optimization of a bearingless rotor blade. [Internet] [Doctoral dissertation]. Georgia Tech; 2010. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/1853/33916.

Council of Science Editors:

Gündüz ME. Software integration for automated stability analysis and design optimization of a bearingless rotor blade. [Doctoral Dissertation]. Georgia Tech; 2010. Available from: http://hdl.handle.net/1853/33916


Georgia Tech

2. Masood, Mir. Digitally-Assisted, Efficiency Enhanced, Linear RF Power Amplifier Architectures.

Degree: PhD, Electrical and Computer Engineering, 2018, Georgia Tech

This dissertation presents the use of advanced digital techniques in the development of efficiency enhanced, linearized power amplifier (PA) architectures. In this research, digital enhancements are used to boost the efficiency of a dual-input LDMOS Doherty PA of 500W peak power. It is shown that the improved phase adjustment and the waveform conditioning for the Auxiliary PA, results in ~ 4% improvement in the efficiency of the Doherty PA. This efficiency improvement comes at the cost of degradation in linearity. A new segmented DPD architecture is proposed which subdivides the complete dynamic range of the Doherty PA into two power regions, a lower and a higher power region. As the nature of non-linearities exhibited by the Doherty PA are different in these distinct regions, the segmented DPD architecture is found suitable in this scenario. It is shown that by using the segmented DPD architecture, stringent linearity requirement of -55 dBc is adequately met. Advisors/Committee Members: Kenney, James S (advisor), Anderson, David V (committee member), Ansari, Azadeh (committee member), Yoder, Paul D (committee member), Khalid, Adeel (committee member).

Subjects/Keywords: pre-distortion; power amplifier; Doherty

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Masood, M. (2018). Digitally-Assisted, Efficiency Enhanced, Linear RF Power Amplifier Architectures. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/61115

Chicago Manual of Style (16th Edition):

Masood, Mir. “Digitally-Assisted, Efficiency Enhanced, Linear RF Power Amplifier Architectures.” 2018. Doctoral Dissertation, Georgia Tech. Accessed December 11, 2019. http://hdl.handle.net/1853/61115.

MLA Handbook (7th Edition):

Masood, Mir. “Digitally-Assisted, Efficiency Enhanced, Linear RF Power Amplifier Architectures.” 2018. Web. 11 Dec 2019.

Vancouver:

Masood M. Digitally-Assisted, Efficiency Enhanced, Linear RF Power Amplifier Architectures. [Internet] [Doctoral dissertation]. Georgia Tech; 2018. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/1853/61115.

Council of Science Editors:

Masood M. Digitally-Assisted, Efficiency Enhanced, Linear RF Power Amplifier Architectures. [Doctoral Dissertation]. Georgia Tech; 2018. Available from: http://hdl.handle.net/1853/61115


Georgia Tech

3. Omer, Mohammad. Towards harmonious coexistence : linear and nonlinear techniques for interference management in RFICs.

Degree: PhD, Electrical and Computer Engineering, 2013, Georgia Tech

This thesis has sought to provide another look at RF interference at the fundamental level. While previous interference control and regulation methods have existed in the literature, they were more focused on preventing the interference from happening. On the contrary, we have taken a different approach of correcting the interference once it has happened. This allows the transmitters to be more nonlinear, passive filter design to be eased, and receivers to be aware of interference problems. Under this unifying theme of building intelligent radios where receivers are more cognizant of the transmission environment, we have presented a number of architectures. Advisors/Committee Members: Kenney, James S. (advisor), Khalid, Adeel (committee member), Baxley, Bob (committee member), Anderson, David V. (committee member), Durgin, Gregory D. (committee member), Akyildiz, Ian F. (committee member).

Subjects/Keywords: RF; Nonlinear modeling; PAPR; Volterra series; Adaptive filters; Radio frequency integrated circuits; Radio Interference; Radio frequency; Wireless communication systems

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Omer, M. (2013). Towards harmonious coexistence : linear and nonlinear techniques for interference management in RFICs. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/51938

Chicago Manual of Style (16th Edition):

Omer, Mohammad. “Towards harmonious coexistence : linear and nonlinear techniques for interference management in RFICs.” 2013. Doctoral Dissertation, Georgia Tech. Accessed December 11, 2019. http://hdl.handle.net/1853/51938.

MLA Handbook (7th Edition):

Omer, Mohammad. “Towards harmonious coexistence : linear and nonlinear techniques for interference management in RFICs.” 2013. Web. 11 Dec 2019.

Vancouver:

Omer M. Towards harmonious coexistence : linear and nonlinear techniques for interference management in RFICs. [Internet] [Doctoral dissertation]. Georgia Tech; 2013. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/1853/51938.

Council of Science Editors:

Omer M. Towards harmonious coexistence : linear and nonlinear techniques for interference management in RFICs. [Doctoral Dissertation]. Georgia Tech; 2013. Available from: http://hdl.handle.net/1853/51938

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