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AN ENGINEERING MATHEMATICIAN
Fluids under PressureSummer School and Workshop
PRAGUE 2016
Ernest L. (Fritz) RoetmanBoeing, (ret.) Embry-Riddle Univ.
TOPICS
INTRODUCTORY REMARKS B-1B
SIGNATURE TECHNOLOGY EQUATIONS OF MAXWELL
SURPRISES CONCLUSIONS
EARLY YEARS
Alaska Bell Laboratories – Whippany 1963
Weapons Development CenterStevens Institute of Technology 1966
Marathon Oil Co.University of Missouri 1968
Atomic Energy Commission – AmesDepartment of Energy – Richland
Univ. of Missouri Medical School
INDUSTRY – ENGINEERING FOCUS
PHYSICS AND MATHEMATICS ARE MEANSNOT ENDS
PROBLEMS ARE NOT PHYSICALLY “CLEAN”
“ENGINEERING INSIGHT” OFTEN REQUIRED
LANGUAGE BARRIERS - COMMUNICATION
TIME and BUDGET CONSTRAINED
Boeing
Analysis of electrical generator transient.Boeing Military Airplane Co.
B1-B Bomber - antenna/radome integration
Radar signature technology
Computational mechanics Manager
Aerodynamics technology staff Chief Engineer
B1 B data
Role Supersonic heavy strategic bomber
National origin United StatesManufacturer North American Rockwell/Rockwell InternationalBoeingFirst flight 23 December 1974Introduction 1 October 1986Status In servicePrimary user United States Air ForceProduced 1973–74, 1983–88Number built B-1A: 4 B-1B: 100Unit cost US$283.1 million in 1998 (B-1B)[1]
B1-B Radom Integration
Beam distortion by Radom
Phased array antenna>1000 TR modules
Guidance – Navigation – Controlterrain following flight regime
B1-B Radom Integration
System Issues
Look up table in guidance computer for angle correction .
Experimental data – radar range.
Data acquisition system modernization.
Radar computer integration into test equipment
Technician training
Prototype table for training and software testing and debug
B1 B supersonic
Signature Technology
Radar signature
Radar scattering
Equations of Maxwell
Antenna theory
Physical optics
Numerical modeling
Maxwell - Anisotropic
6-vector system elements definitions
3
1 kkk
U F B F Jt x
Equations of Maxwell
3
1 kkk
U F B F Jt x
Hyperbolic first order symmetric system in standard form. (Wilcox, 1966, Arch Rat Mech)
Roetman, Kochhar, Hower, 1992, An integral representation for …. ,
Electromagnetics 12, 1-15
Me 262 Schwalbe
Manufacturer Messerschmitt
First flight 18 April 1941 with piston engine18 July 1942 with jet engines
Introduction April 1944
Retired 1945, Germany1951, Czechoslovakia[4]
Primary users LuftwaffeCzechoslovak Air Force (S-92)
Number built 1,430
ME 262 Signature
Aerodynamics Technology Staff
Computational Mechanics
Computational Fluid Dynamics
Tech Staff Chief
USAF approves KC-46A Pegasus for
production |AeroTime, 2016.08.16
Scale Model
C F D FLOW
BE 200
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