{"project":{"acronym":"","projectId":6063,"title":"Optimizing Noise Attenuation in Aircraft Exhaust Ducts Employing Passive and Active Absorbing Splitters and Struts, Phase I","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}],"description":"NASA requires accurate numerical simulation of high bypass nacelle acoustics and the development of advanced nacelle absorption techniques to reduce engine noise levels. Thus, this Phase I effort will expand current Transient Finite Difference (TFD) nacelle algorithms to include ?\tSimulation of active and passive nacelle exhaust splitters, ?\t3D simulation of passive and active absorbing radial struts, ?\tOptimization of multiple segment wall, splitter and strut absorbers for maximum noise reduction. The exceptional performance and accuracy of the TFD method has already been documented for passive and active noise reductions in 2D aircraft nacelles. Recent experimental data have show promise for significant noise reduction for active noise treated struts as well as classic exhaust splitters. Therefore, this Phase I study will extend the current TFD nacelle algorithms to optimize splitter rings usage in exit nacelle ducts and 3D active and passive treatment of exhaust duct struts. The Phase II effort will include the capability of analyzing more complex 3D ducts with circumferential-segmented absorbing liners as well as external cowling and airframe noise sources. The numerical algorithms of this TFD Phase I study will provide NASA Glen and industry an innovative tool for acoustic nacelle design. ","startYear":2006,"startMonth":1,"endYear":2006,"endMonth":7,"statusDescription":"Completed","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}],"website":"","libraryItems":[],"transitions":[],"responsibleMd":{"acronym":"STMD","canUserEdit":false,"city":"","external":false,"linkCount":0,"organizationId":4875,"organizationName":"Space Technology Mission Directorate","organizationType":"NASA_Mission_Directorate","naorganization":false,"organizationTypePretty":"NASA Mission Directorate"},"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.
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