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Full-Text Articles in Engineering
Using Coupled Eulerian And Lagrangian Grids To Model Explosive Interactions With Buildings, Braden Lusk, William P. Schonberg, Jason Baird, Robert S. Woodley, Warren Noll
Using Coupled Eulerian And Lagrangian Grids To Model Explosive Interactions With Buildings, Braden Lusk, William P. Schonberg, Jason Baird, Robert S. Woodley, Warren Noll
Mining Engineering Faculty Research & Creative Works
This paper presents the development of a computational model that can be used to study the interactions between structures and detonating explosives contained within them. This model was developed as part of an effort to develop a rubble characterization model for use in AmmoSIM, an agent based urban tactical decision aid (UTDA) software for weapon-target pairing. The rubble pile created following the collapse of a building in a combat situation can significantly impact mission accomplishment, particularly in the area of movement and maneuver. The information provided by AmmoSIM will enable both platoon level and command center staff to make informed …
Numerical Analysis Of Sandwiched Composite-Fss Structures, Rui Qiang, Ji Chen, Jingyu Huang, Marina Koledintseva, Richard E. Dubroff, James L. Drewniak, Fan Yang
Numerical Analysis Of Sandwiched Composite-Fss Structures, Rui Qiang, Ji Chen, Jingyu Huang, Marina Koledintseva, Richard E. Dubroff, James L. Drewniak, Fan Yang
Electrical and Computer Engineering Faculty Research & Creative Works
A numerical technique to analyze shielding effectiveness of sandwiched FSS-composite structures is proposed. This technique is based on using a dispersive FDTD method in conjuncture with a novel periodic boundary condition to model sandwiched FSS-composite elements. Results show that by inserting single or multilayered FSS elements into composite materials, better shielding effectiveness can be achieved.
Common-Mode Radiation Resulting From Hand-Assembled Cable Bundles On Automotive Platforms, Shishuang Sun, James L. Drewniak, David Pommerenke
Common-Mode Radiation Resulting From Hand-Assembled Cable Bundles On Automotive Platforms, Shishuang Sun, James L. Drewniak, David Pommerenke
Electrical and Computer Engineering Faculty Research & Creative Works
A statistical cable harness model is developed to account for the random disturbance of the wire positions along hand-assembled bundles. The non-uniform random bundles are modeled as n-cascaded segments of uniform multi-conductor transmission line. At each section, all wire positions are disturbed with random numbers obeying a Gaussian distribution. In addition, a spline interpolation function is used to improve the smoothness of wires winding along the bundle. The common-mode current distribution along the bundle calculated with SPICE is injected into a full-wave tool, e.g., FDTD, as impressed current sources. Thus, the full-vehicle electromagnetic emissions from the automotive harness can …
High Resolution Millimeter Wave Detection Of Vertical Cracks In The Space Shuttle External Tank Spray-On-Foam Insulation (Sofi), Sergey Kharkovsky, R. Zoughi, F. L. Hepburn
High Resolution Millimeter Wave Detection Of Vertical Cracks In The Space Shuttle External Tank Spray-On-Foam Insulation (Sofi), Sergey Kharkovsky, R. Zoughi, F. L. Hepburn
Electrical and Computer Engineering Faculty Research & Creative Works
Space Shuttle Columbia's catastrophic failure, the separation of a piece of spray-on-foam insulation (SOFI) from the external tank (ET) in the Space Shuttle Discovery's flight in 2005 and crack detected in its ET foam prior to its successful launch in 2006 emphasize the need for effective nondestructive methods for inspecting the shuttle ET SOFI. Millimeter wave nondestructive testing methods have been considered as potential and effective inspection tools for evaluating the integrity of the SOFI. This paper presents recent results of an investigation for the purpose of detecting vertical cracks in SOFI panels using a focused millimeter wave (150 GHz) …
Modeling Of The Ic's Switching Currents On The Power Bus Of A High Speed Digital Board, Mauro Lai, James L. Drewniak, Vittorio Ricchiuti, Antonio Orlandi, Giulio Antonini
Modeling Of The Ic's Switching Currents On The Power Bus Of A High Speed Digital Board, Mauro Lai, James L. Drewniak, Vittorio Ricchiuti, Antonio Orlandi, Giulio Antonini
Electrical and Computer Engineering Faculty Research & Creative Works
When the performances of the electronic technology increase (higher frequencies, more power, lover power supply, faster transistors, reduced chip dimensions), designing electronic equipment becomes more challenging for the electronic engineers. Signal and power integrity on board become of paramount importance. One of the main causes of board malfunctions and electromagnetic radiation is the simultaneous switching noise (SSN) due to the integrated circuits soldered on the board. The paper proposes two simple procedures to model the SSN, so to evaluate its effects in any point of the board.