Oral Comprehensive Exam for Doctoral Candidacy by: John C. Cochran
When: Friday,
September 8, 2017
2:00 PM
-
4:00 PM
Where: Science & Engineering Building, Lester W. Cory Conference Room: Room 213A
Cost: free
Description: Topic: Modeling of Electroacoustic Characteristics of Slotted Cylinder Projectors for Underwater Sound Including Radiation Impedance
Location: Lester W. Cory Conference Room, Science & Engineering Building (SENG), Room 213A
Abstract:
This thesis provides a general theory for the Slotted Cylinder Projector (SCP). The design equations are developed and provided with the degree of taper being an independent variable. The development described is applicable to the uniform wall SCP as well as the tapered geometry of the tapered wall SCP. Geometries between these two extremes will also be covered by the model. This thesis will expand on the previous work for uniformly thick walled SCPs, and work on tapered wall SCPs. An analytical model for the prediction of the performance of the Tapered Wall SCP will be provided. Using a static stress balance on elements within the transducer, a model for the deflection profile acting under a uniform hydrostatic load is developed. The resulting deflection profile eigen-function is equated to the velocity profile eigen-function when the transducer is driven in its fundamental mode. The velocity profile eigen-functions are used to develop equations for kinetic and potential energy within the transducer. An energy balance is used to determine key transducer performance parameters (resonant frequency, Mechanical Q, flexural mass, flexural stiffness, and electro-mechanical coupling factor) when the transducer is operated without any radiation loading. The radiation loading for the SCP is discussed below but with the improved loading model described herein, changes in resonant frequency, bandwidth, and performance are developed. The design parameters are put in the form of an electro-mechanical equivalent circuit from which the overall performance of the SCP can be determined.
NOTE: All ECE Graduate Students are ENCOURAGED to attend.
All interested parties are invited to attend. Open to the public.
Advisor: Dr. David A. Brown
Committee Members: Dr. John R. Buck and Dr. Paul J. Gendron, Department of Electrical & Computer Engineering; Dr. Corey L. Bachand, Bachand Engineering
*For further information, please contact Dr. David A. Brown at 508.999.8479, or via email at dbrown@umassd.edu.
Location: Lester W. Cory Conference Room, Science & Engineering Building (SENG), Room 213A
Abstract:
This thesis provides a general theory for the Slotted Cylinder Projector (SCP). The design equations are developed and provided with the degree of taper being an independent variable. The development described is applicable to the uniform wall SCP as well as the tapered geometry of the tapered wall SCP. Geometries between these two extremes will also be covered by the model. This thesis will expand on the previous work for uniformly thick walled SCPs, and work on tapered wall SCPs. An analytical model for the prediction of the performance of the Tapered Wall SCP will be provided. Using a static stress balance on elements within the transducer, a model for the deflection profile acting under a uniform hydrostatic load is developed. The resulting deflection profile eigen-function is equated to the velocity profile eigen-function when the transducer is driven in its fundamental mode. The velocity profile eigen-functions are used to develop equations for kinetic and potential energy within the transducer. An energy balance is used to determine key transducer performance parameters (resonant frequency, Mechanical Q, flexural mass, flexural stiffness, and electro-mechanical coupling factor) when the transducer is operated without any radiation loading. The radiation loading for the SCP is discussed below but with the improved loading model described herein, changes in resonant frequency, bandwidth, and performance are developed. The design parameters are put in the form of an electro-mechanical equivalent circuit from which the overall performance of the SCP can be determined.
NOTE: All ECE Graduate Students are ENCOURAGED to attend.
All interested parties are invited to attend. Open to the public.
Advisor: Dr. David A. Brown
Committee Members: Dr. John R. Buck and Dr. Paul J. Gendron, Department of Electrical & Computer Engineering; Dr. Corey L. Bachand, Bachand Engineering
*For further information, please contact Dr. David A. Brown at 508.999.8479, or via email at dbrown@umassd.edu.
Contact:
ECE: Electrical & Computer Engineering Department 508.999.9164 http://www.umassd.edu/engineering/ece/
Topical Areas: General Public, University Community, College of Engineering, Electrical and Computer Engineering