NASA SBIR 2019-II Solicitation

Proposal Summary

 19-2- A1.02-2701
 Quiet Performance - Airframe Noise Reduction
 High-Resolution Source Characterization and Modeling for Efficient Prediction of Propulsion-Airframe Aeroacoustics
SMALL BUSINESS CONCERN (Firm Name, Mail Address, City/State/Zip, Phone)
ATA Engineering, Inc.
13290 Evening Creek Drive South
San Diego, CA 92128
(858) 480-2000

PRINCIPAL INVESTIGATOR (Name, E-mail, Mail Address, City/State/Zip, Phone)
Parthiv Shah
13290 Evening Creek Drive South, Suite 250
San Diego, CA 92128 - 4695
(858) 480-2101

BUSINESS OFFICIAL (Name, E-mail, Mail Address, City/State/Zip, Phone)
Joshua Davis
13290 Evening Creek Drive South
San Diego, CA 92128 - 4695
(858) 480-2028

Estimated Technology Readiness Level (TRL) :
Begin: 3
End: 5
Technical Abstract (Limit 2000 characters, approximately 200 words)

ATA Engineering, Inc. (ATA) and partners propose a Phase II SBIR project to further develop methods to efficiently characterize and predict noise performance of aircraft with substantial propulsion airframe aeroacoustics (PAA) effects. The methods utilize near-field surface source models informed by high-spatial-resolution acoustic measurements. Over the last decade, ATA has matured the multireference continuous-scan (CS) acoustic measurement technology that is needed to define and validate such source models. Previous demonstrations of CS measurements include beamforming, near-field acoustical holography, and turbofan tone order tracking.
In Phase I, the team applied such measurements to canonical experiments along with a small-scale ducted fan using fixed and scanning sensors in the near, mid, and far field to define stochastic source models. These models supported novel acoustic shielding predictions by directly detecting the wavepacket-like nature of acoustic events that propagate to the far field as well as using this information to define surface-based source models to predict noise shielding/scattering from PAA using the boundary element method (BEM). Additionally, a 60-channel 2D rotating array characterized the sound field generated by a speaker with and without scattering bodies at an unprecedented high-resolution of nearly 10,000 virtual sensors. This provided a clear visualization of the interference patterns of a complex sound field in the presence of a rigid body and demonstrated the ability to couple isolated source characterization measurements to BEM for PAA problems.
In Phase II, ATA proposes to extend the methods to more complex geometries in order to (1) define an efficient BEM-based noise prediction process that utilizes PAA sources derived from high-resolution CS measurements and/or state-of-the-art predictive tools, and (2) integrate the process into far-field noise prediction frameworks such as NASA’s Aircraft NOise Prediction Program (ANOPP).

Potential NASA Applications (Limit 1500 characters, approximately 150 words)

This technology provides NASA new capabilities to develop next-generation airframes and propulsion systems. The tools will find use at NASA centers like the AAPL and 9′ × 15′ LSWT, the Unitary Plan Wind Tunnels, and the 14′ × 22′ subsonic tunnel and Structural Acoustics Loads and Transmission (SALT) facility. NASA can test PAA in these facilities with devices such as the Compact Jet Engine Simulator, Broadband Engine Noise Simulators, fan engine simulators, and a small turbofan.

Potential Non-NASA Applications (Limit 1500 characters, approximately 150 words)

Non-NASA applications of this high-resolution technology include air mobility vehicle noise, automotive and heavy equipment noise, consumer audio, and factory equipment. Many of these applications rely on source localization using acoustic cameras, implying immediate commercialization opportunities for the superior diagnostics resulting from this effort.

Duration: 24

Form Generated on 05/04/2020 06:23:24