{"project":{"acronym":"","projectId":93426,"title":"Continuous-Scan Phased Array Measurement Methods for Turbofan Engine Acoustic Testing","primaryTaxonomyNodes":[{"taxonomyNodeId":10950,"taxonomyRootId":8816,"parentNodeId":10946,"level":3,"code":"TX15.1.4","title":"Aeroacoustics","definition":"Aeroacoustics is a branch of acoustics that studies noise generation via either turbulent fluid motion or aerodynamic forces interacting with surfaces, including periodically varying flows such as shock waves and noise generated by landing gears and deflected aero surfaces; and non-periodic unsteady flows such as those encountered during ascent of launch vehicles and spacecraft.","exampleTechnologies":"The technologies involved include an integrated approach to computational predictive methods, sensors, and test techniques to study aeroacoustic effects generated by shock motion, flow separation and reattachment, exhaust plumes and plume impingement, and sonic booms. Technologies extend to support the prediction of aeroacoustic effects on vehicle structure, vehicle subsystems (such as electronics), the community, and methods to mitigate these effects for operations including buffet and aeroacoustic load reduction, noise reduction, sonic boom mitigation, and efficient airframe-engine integration. These technologies are applied to fixed-wing, vertical lift, Unmanned Aerial Systems/Urban Air Mobility vehicles, launch vehicles, abort vehicles, and spacecraft.","hasChildren":false,"hasInteriorContent":true}],"startTrl":5,"currentTrl":7,"endTrl":7,"benefits":"ATA believes that significant benefits could be achieved through implementing the CS acoustic measurement technology in NASA wind tunnel and free-jet facilities. The resulting capability would support noise reduction goals set forth in the Aeronautics Research Mission Directorate's (ARMD's) Strategic Implementation Plan (SIP). In particular, Strategic Thrust 3: Ultra-Efficient Commercial Vehicles establishes noise improvement margins (relative to the FAA Stage 4 noise limit) of −32 dB, −42 dB, and −52 dB, for N+1, N+2, and N+3 future aircraft technology generations, respectively. ATA's technology will support progress toward all four NASA long-term research themes under the Subsonic Transport portion of the strategic thrust (3A): Ultra-efficient airframes, Ultra-efficient propulsion, Ultra-efficient vehicle system integration, and Modeling, simulation, and test capability research. In the coming decades, progress towards these objectives will be accomplished through research conducted in NASA and commercial experimental facilities. Examples of aeroacoustic measurement facilities that could readily adapt the technology include the 9' x 15' Low Speed Wind Tunnel (LSWT), Aero-Acoustic Propulsion Laboratory (AAPL), and 14' x 22' Subsonic Wind Tunnel.
Community noise exposure continues to be a significant issue near airports, confining growth and impacting quality of life and health of those affected. To counteract growing exposure, ever more stringent noise standards are expected to be implemented by regulatory agencies in the certification of aircraft. These standards are predicated on the discovery of new technologies aimed at reducing aircraft and engine noise. Further noise performance improvements will likely be asymptotic, with incremental improvements resulting in only modest noise reduction. Thus, innovative measurement technologies to better identify and diagnose noise sources within the aircraft and engine are necessary, particularly for the subscale-size test articles and low-SNR environments of wind tunnel testing. ATA believes there is a significant market opportunity for the enhanced CS toolset through adoption at engine manufacturers, airframers, and international aviation authorities. Beyond aviation, CS tools and methods will be applicable to wind turbine, automotive, and industrial noise.","description":"To allow aviation growth to continue in the face of increasingly stringent noise pollution standards, new aircraft engines must be designed with noise performance as a principal constraint. Technologies to realize future propulsion noise reduction will require detailed experimental characterization and diagnosis of the acoustic mechanisms and sources within an engine system or component. ATA Engineering, Inc. (ATA) proposes an SBIR project to further develop and validate methods for obtaining phased array acoustic data from complex distributed noise sources using continuously moving, or continuous-scan (CS) microphones in conjunction with state-of-the-art phase-referencing techniques. The benefits of the CS method include (1) effectively infinite spatial resolution, as the sound field cross-spectrum may be described between any two locations along the scan trajectory, (2) preservation of phase data for improved source and propagation modeling, including beamforming (BF) and acoustical holography (AH), (3) significant reduction of test data acquisition time (potentially two to ten times faster) per operational point, and consequently either (4) reduced test operational cost, or (5) the opportunity to screen more design concepts within a given budget. The Phase II effort will use subscale aeroacoustic testing to validate the novel continuous-scan beamforming (CSBF) measurement techniques with the aim of eventual implementation in NASA acoustic wind tunnel and free-jet testing facilities. ATA will also formalize a CS software toolkit for data processing and visualization and design a full-scale array concept for a candidate NASA wind tunnel facility.","startYear":2017,"startMonth":4,"endYear":2019,"endMonth":4,"statusDescription":"Completed","principalInvestigators":[{"contactId":364097,"canUserEdit":false,"firstName":"Parthiv","lastName":"Shah","fullName":"Parthiv N Shah","fullNameInverted":"Shah, Parthiv N","middleInitial":"N","primaryEmail":"parthiv.shah@ata-e.com","publicEmail":true,"nacontact":false}],"programDirectors":[{"contactId":206378,"canUserEdit":false,"firstName":"Jason","lastName":"Kessler","fullName":"Jason L Kessler","fullNameInverted":"Kessler, Jason L","middleInitial":"L","primaryEmail":"jason.l.kessler@nasa.gov","publicEmail":true,"nacontact":false}],"programExecutives":[{"contactId":215154,"canUserEdit":false,"firstName":"Jennifer","lastName":"Gustetic","fullName":"Jennifer L Gustetic","fullNameInverted":"Gustetic, Jennifer L","middleInitial":"L","primaryEmail":"jennifer.l.gustetic@nasa.gov","publicEmail":true,"nacontact":false}],"programManagers":[{"contactId":62051,"canUserEdit":false,"firstName":"Carlos","lastName":"Torrez","fullName":"Carlos Torrez","fullNameInverted":"Torrez, Carlos","primaryEmail":"carlos.torrez@nasa.gov","publicEmail":true,"nacontact":false}],"projectManagers":[{"contactId":112104,"canUserEdit":false,"firstName":"David","lastName":"Stephens","fullName":"David B Stephens","fullNameInverted":"Stephens, David B","middleInitial":"B","primaryEmail":"david.stephens@nasa.gov","publicEmail":true,"nacontact":false},{"contactId":461333,"canUserEdit":false,"firstName":"Theresa","lastName":"Stanley","fullName":"Theresa M Stanley","fullNameInverted":"Stanley, Theresa M","middleInitial":"M","primaryEmail":"theresa.m.stanley@nasa.gov","publicEmail":true,"nacontact":false}],"website":"","libraryItems":[{"file":{"fileExtension":"pdf","fileId":295031,"fileName":"SBIR_2016_2_BC_A1.02-8366","fileSize":867903,"objectId":291554,"objectType":{"lkuCodeId":889,"code":"LIBRARY_ITEMS","description":"Library Items","lkuCodeTypeId":182,"lkuCodeType":{"codeType":"OBJECT_TYPE","description":"Object Type"}},"objectTypeId":889,"fileSizeString":"847.6 KB"},"files":[{"fileExtension":"pdf","fileId":295031,"fileName":"SBIR_2016_2_BC_A1.02-8366","fileSize":867903,"objectId":291554,"objectType":{"lkuCodeId":889,"code":"LIBRARY_ITEMS","description":"Library Items","lkuCodeTypeId":182,"lkuCodeType":{"codeType":"OBJECT_TYPE","description":"Object Type"}},"objectTypeId":889,"fileSizeString":"847.6 KB"}],"id":291554,"title":"Briefing Chart","description":"Continuous-Scan Phased Array Measurement Methods for Turbofan Engine Acoustic Testing, Phase II Briefing 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Testing","startTrl":4,"currentTrl":5,"endTrl":5,"benefits":"As part of Strategic Thrust 3: Ultra-Efficient Commercial Vehicles, in the Strategic Implementation Plan issued by the Aeronautics Research Mission Directorate (ARMD), NASA establishes noise improvement margins (relative to the FAA Stage 4 noise limit) of −32 dB, −42 dB, and −52 dB, for N+1, N+2, and N+3 future aircraft technology generations, respectively. The plan also calls for \"tools and technologies to reduce turbofan-thrust-specific fuel consumption, propulsion noise, and emissions.\" By improving the quality and efficiency of acoustic measurements taken in wind tunnels, the proposed measurement and modeling technology will provide NASA with new capabilities to lead the development of next-generation propulsion systems, airframes, and efficiency technologies. Multiple NASA research centers operate wind tunnels that support aeronautical acoustics research, including the Unitary Plan Wind Tunnels at NASA Ames, the 14' x 22' subsonic tunnel at NASA LaRC, and the 9' x 15' LSWT and five others at NASA GRC.
Community noise exposure continues to be a significant issue near airports, confining growth and impacting quality of life and health of those affected. To counteract growing exposure, ever more stringent noise standards are expected to be implemented by regulatory agencies in the certification of aircraft. These standards are predicated on the discovery of new technologies aimed at reducing aircraft and engine noise. Further noise performance improvements will likely be asymptotic, with incremental improvements resulting in only modest noise reduction. Thus, innovative measurement technologies to better identify and diagnose noise sources within the aircraft and engine are necessary, particularly for the subscale-size test articles and low-SNR environments of wind tunnel testing. ATA believes there is a significant market opportunity for the enhanced CS toolset through adoption at engine manufacturers, airframers, and international aviation authorities. Beyond aviation, CS tools and methods will be applicable to wind turbine, automotive, and industrial noise.","description":"ATA Engineering, Inc., (ATA) proposes an SBIR project to advance the technology readiness level (TRL) of a method for measuring phased array acoustic data for complex distributed noise sources using continuously moving (referred to here as continuous-scan, or CS) microphones in conjunction with state-of-the-art phase-referencing techniques. The proposed project aims to develop two novel modules to the existing suite of tools for CS acoustic measurements: (1) A continuous-scan beamforming (CSBF) tool for arrays located in the mid to far field to perform source diagnostics in low-SNR wind tunnel environments., and (2) An azimuthal modal decomposition tool for near-field arrays having partial azimuthal coverage, enabling acoustical holography without full source enclosure. The first module will enable small-aperture beamforming (BF) arrays to adopt the CS method, resulting in reduced maximum sidelobe levels and higher-quality BF images that approach the theoretical limits associated with the theory. The second module will enable CS near-field arrays that avoid the requirement for full coverage, greatly simplifying the array coverage requirements and making acoustical holography systems more practical in testing facilities. In Phase I, ATA will demonstrate feasibility of the methods through application to existing acoustic measurement data sets. In Phase II, the methods will be optimized and rigorously validated through experiments using small-scale turbofan engine models. Ultimately, we will transition these methods to NASA and industry stakeholders for adoption in relevant facilities.","startYear":2016,"startMonth":6,"endYear":2016,"endMonth":12,"statusDescription":"Completed","website":"","program":{"acronym":"SBIR/STTR","active":true,"description":"
The NASA SBIR and STTR programs fund the research, development, and demonstration of innovative technologies that fulfill NASA needs as described in the annual Solicitations and have significant potential for successful commercialization. If you are a small business concern (SBC) with 500 or fewer employees or a non-profit RI such as a university or a research laboratory with ties to an SBC, then NASA encourages you to learn more about the SBIR and STTR programs as a potential source of seed funding for the development of your innovations.
The SBIR and STTR programs have 3 phases:
The SBIR and STTR Phase I contracts last for 6 months with a maximum funding of $125,000, and Phase II contracts last for 24 months with a maximum funding of $750,000 - $1.5 million.
Opportunity for Continued Technology Development Post-Phase II:
The NASA SBIR/STTR Program currently has in place two initiatives for supporting its small business partners past the basic Phase I and Phase II elements of the program that emphasize opportunities for commercialization. Specifically, the NASA SBIR/STTR Program has the Phase II Enhancement (Phase II-E) and Phase II eXpanded (Phase II-X) contract options.
Please review the links below to obtain more information on the SBIR/STTR programs.
Provides an overview of the SBIR and STTR programs as implemented by NASA
Provides access to the annual SBIR/STTR Solicitations containing detailed information on the program eligibility requirements, proposal instructions and research topics and subtopics
Schedule and links for the SBIR/STTR solicitations and selection announcements
Federal and non-Federal sources of assistance for small business
Search our complete archive of awarded project abstracts to learn about what NASA has funded
Still have questions? Visit the program FAQs
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The SBIR and STTR programs have 3 phases:
The SBIR and STTR Phase I contracts last for 6 months with a maximum funding of $125,000, and Phase II contracts last for 24 months with a maximum funding of $750,000 - $1.5 million.
Opportunity for Continued Technology Development Post-Phase II:
The NASA SBIR/STTR Program currently has in place two initiatives for supporting its small business partners past the basic Phase I and Phase II elements of the program that emphasize opportunities for commercialization. Specifically, the NASA SBIR/STTR Program has the Phase II Enhancement (Phase II-E) and Phase II eXpanded (Phase II-X) contract options.
Please review the links below to obtain more information on the SBIR/STTR programs.
Provides an overview of the SBIR and STTR programs as implemented by NASA
Provides access to the annual SBIR/STTR Solicitations containing detailed information on the program eligibility requirements, proposal instructions and research topics and subtopics
Schedule and links for the SBIR/STTR solicitations and selection announcements
Federal and non-Federal sources of assistance for small business
Search our complete archive of awarded project abstracts to learn about what NASA has funded
Still have questions? Visit the program FAQs
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