USA flag logo/image

An Official Website of the United States Government

Development of Wavelet Stochastic Estimation for Identifying the Contribution…

Award Information

National Aeronautics and Space Administration
Award ID:
Program Year/Program:
2011 / SBIR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
Spectral Energies, LLC
5100 Springfield Street Suite 301 Dayton, OH -
View profile »
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Phase 1
Fiscal Year: 2011
Title: Development of Wavelet Stochastic Estimation for Identifying the Contribution of Turbulent Structures to the Sound Field of Shear Flows
Agency: NASA
Contract: NNX11CG68P
Award Amount: $99,918.00


Fundamental understanding of noise generation and the development of noise reduction technology requires the development of tools that can analyze simultaneously the relationship between the turbulent flow field and the pressure field both near and far. In this proposal we will demonstrate how Wavelet Stochastic Estimation (WSE) is the most optimal method for correlating the source region to the sound field when using a microphone array and Particle Image Velocimetry. WSE first transforms the far-field pressure signal into the wavelet domain which then enables both temporal and frequency information to be correlated with the flow field. By adding the frequency information to the correlations, it becomes easier to extract the contribution from the large-scale structures and thus relate their dynamics to noise generation. We also demonstrate how WSE can be used with flow structure identification methods, such as the Proper Orthogonal Decomposition (POD), to further improve the link between the sound field and the turbulent flow field. The proposed technology supports the Fundamental Aeronautics Program by improving noise prediction and measurement methods. The technology will be available for both subsonic and supersonic vehicles, with particular emphasis on noise sources generated from shear flows.

Principal Investigator:

Sivaram Gogineni
Principal Investigator

Business Contact:

Sivaram Gogineni
Business Official
Small Business Information at Submission:

Spectral Energies, LLC
OH Dayton, OH 45431-1262

EIN/Tax ID: 020780873
Number of Employees:
Woman-Owned: Yes
Minority-Owned: No
HUBZone-Owned: No