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