"IGF::OT::IGF" OTHER FUNCTIONS: 1. TASK ORDER TITLE: SONIC BOOM PROPAGATION TOOLS AND METHODS FOR LOW SONIC…

Public award description

"IGF::OT::IGF" OTHER FUNCTIONS: 1. TASK ORDER TITLE: SONIC BOOM PROPAGATION TOOLS AND METHODS FOR LOW SONIC BOOM DESIGN 2. PURPOSE, OBJECTIVE, AND BACKGROUND OF WORK TO BE PERFORMED: THE FOLLOWING TASK DESCRIPTIONS ARE IN SUPPORT OF THE SYSTEM LEVEL TOOLS&CONCEPT DESIGN SUB-PROJECT OF THE NASA FUNDAMENTAL AERONAUTICS HIGH SPEED PROJECT. THE OVERALL EFFORT IS FOCUSED ON IMPROVING THE DESIGN CYCLE TIME AND UNCERTAINTY IN LOW BOOM SUPERSONIC VEHICLE DESIGN. THE NEED FOR ROBUST MULTI-FIDELITY DESIGN AND ANALYSIS TOOLS FOR SONIC BOOM WILL ENABLE IMPROVED CYCLE TIME WITH MORE ACCURATE PREDICTIONS OF OVERALL SONIC BOOM LEVELS. IN ORDER TO REDUCE THE OVERALL SONIC BOOM LEVELS AND ALLOW PRACTICAL SUPERSONIC FLIGHT OVER LAND, IMPROVED ALGORITHMS WILL BE NEEDED FOR PERFORMING EFFICIENT DESIGN OPTIMIZATION AND RE-DESIGN. IN ADDITION, THOROUGH UNDERSTANDING OF THE UNDERLYING PHYSICAL PRINCIPLES OF ATMOSPHERIC PROPAGATION, BETTER TARGET GENERATION, CONSIDERATION OF OFF-TRACK EFFECTS AND OTHER INTEGRATION CHALLENGES NEED TO BE ADDRESSED. THE CURRENT SONIC BOOM PROPAGATION PROCESS USES ADVANCED PROPAGATION MECHANISMS TO BE ABLE TO ACCURATELY PREDICT BOTH THE UNDER-TRACK AND OFF-TRACK BOOM SIGNATURES. THIS, COUPLED WITH AUTOMATED OFF-BODY COMPUTATIONAL FLUID DYNAMICS (CFD) ANALYSIS, REPRESENTS THE STATE OF THE ART IN TERMS OF SONIC BOOM ANALYSIS. THE NEEDED WORK IS IN THE DESIGN PROCESS TO ACHIEVE FEASIBLE AIRCRAFT CONCEPTS THAT HAVE LOW SONIC BOOM LEVELS. AS SUCH, WORK IS NEEDED TO STEER BASELINE CONCEPTS TOWARDS OPTIMAL DESIGNS THAT REDUCE THE BOOM LOUDNESS WHILE IMPROVING OR NOT SIGNIFICANTLY DETERIORATING OTHER PERFORMANCE METRICS RELATED TO SUPERSONIC FLIGHT. THE GOALS OF THIS TASK ARE: TO EXPAND THE USE OF ADJOINT-BASED DESIGN METHODS TO REDUCE SONIC BOOM AND DEVELOP BOOM-ADJOINT SHAPE OPTIMIZATION STRATEGIES TO MEET A PRESCRIBED UNDER-TRACK AND/OR OFF-TRACK GROUND SONIC BOOM TARGETS WITH OR WITHOUT ADDITIONAL CONSTRAINTS TO DEVELOP AND IMPROVE THE BOOM-ADJOINT SHAPE OPTIMIZATION PROCESS TO ALLOW THE BASELINE CONCEPT TO MOVE TOWARDS SHAPES THAT ALLOW IT TO PRODUCE A TARGET UNDER-TRACK OR OFF-TRACK LOUDNESS VALUES AT THE GROUND LEVEL WITH OR WITHOUT ADDITIONAL CONSTRAINTS 3. DESCRIPTION OF THE WORK TO BE PERFORMED: THE CONTRACTOR SHALL PERFORM THE FOLLOWING TASK REQUIREMENTS: 3.1 THE CONTRACTOR SHALL DEVELOP A PROCESS TO RUN THE FUN3D ADJOINT OPTIMIZATION WITH POWERED-ENGINE SIMULATION USING GROUND-BASED UNDER-TRACK AND OFF-TRACK OBJECTIVES AND/OR PERFORMANCE OBJECTIVES. 3.2 THE CONTRACTOR SHALL AUTOMATE MASSOUD/BANDAIDS FOR REGIONS AWAY FROM COMPONENT INTERSECTIONS AND EVALUATE USING SCULPTOR FOR COMPONENT INTERSECTION REGIONS. AN AUTOMATED SHAPE PARAMETERIZATION PROCESS IS A NEEDED PRE-REQUISITE FOR PERFORMING SHAPE OPTIMIZATION. 3.3 THE CONTRACTOR SHALL DEMONSTRATE FUN3D ADJOINT OPTIMIZATION FOR MATCHING REVERSED-AE TARGETS. 3.4 THE CONTRACTOR SHALL INCORPORATE FUN3D CAPABILITIES INTO SUP MODELCENTER DESIGN PROCESS MODEL. 3.5 THE CONTRACTOR SHALL DEVELOP ENHANCEMENTS TO THE EXISTING SBOOM CODE. THE ENHANCEMENTS SHALL CONTAIN THE ABILITY TO INCLUDE AIRCRAFT MANEUVER AND TRAJECTORY INFO TO SBOOM CALCULATIONS. THE CONTRACTOR SHALL ALSO ADD THE CAPABILITY TO INCLUDE ADJOINTS WITH RESPECT TO ATMOSPHERIC VARIABLES. POP - 04/01/2013 - 06/30/2014