Seminar Series - 1997-1998

Modeling of a Charged Jet in Electrospinning Process
Thickness Vibration of Rotating Piezoelectric Plates
Digital Prototyping - A Successful Market Strategy

Date:  Tuesday, March 31, 1998
Time:  3:30 p.m.
Place:  W128 Nebraska Hall

Modeling of a Charged Jet in Electrospinning Process

Alexander Spivak
Department of Engineering Mechanics
University of Nebraska
Lincoln, NE  68588-0526
Advisor:  Dr. Yuris Dzenis

Results of a theoretical study of the electrospinning process are presented.  Electrohydrodynamics of a jet in an external electric field was analyzed.  A single differential equation for a weakly conductive charged jet was obtained and parametric analysis of the solution was performed.  An expression for the critical initial radius of the jet was obtained for the first time.  Asymptotic jet radius decay was evaluated.  The results obtained provide fundamental insight on the mechanisms of the electrospinning process.

Thickness Vibration of Rotating Piezoelectric Plates

Huiyu Fang
Department of Engineering Mechanics
University of Nebraska
Lincoln, NE    68588-0526
Advisor:  Dr. Qing Jiang

One important application of piezoelectric materials is to make gyroscopes (angular rate sensors) to measure the angular velocity of a rotating body.  The mechanism of piezoelectric gyroscopes is making use of two modes of a vibrating piezoelectric body in which material particles move in perpendicular directions.  In generalized model, we should investigate the behavior of thickness vibration of a rotating piezoelectric plate.  Based on the studies of thickness vibration of a stationary piezoelectric plate, and some related work in literature, we apply the three-dimensional equations of linear piezoelectricity and introduce Coriolis and centrifugal forces in this analysis.  The theoretical results are performed for the polarized ceramic plates and rotated Y-cut quartz plates.  Some numerical work is to be done to make the work more understandable.  The conclusion of analysis, including the dispersive relations of plan wave and transcendental equations, are very useful in researching the mechanism of plate piezoelectric gyroscopes and some relative mechanical-electric productions.

Digital Prototyping - A Successful Market Strategy

Wei Wang
Department of Engineering Mechanics
University of Nebraska
Lincoln, NE   68588-0526
Advisor:  Dr. Reinhard Piltner

In the battle for market success, short development time is a strategic weapon.  This short period of time can be made possible by the use of "Simultaneous Engineering" complemented by newly developed technologies such as "Computer-Aided Engineering" (CAE).  By the use of CAE methods, the prototyping phase ("real prototyping") of a product can be brought forward to the early development phase ("Digital Prototyping"), by the way; much of the development time and cost will be saved.


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