Tony Lee Parrott, 8734 Bray Wood Rd, Williamsburg, VA 23185

7334998, Feb 26, 2008

Dec 6, 2004

11/005624

Michael G. Jones - Newport News VA, US
Tony L. Parrott - Williamsburg VA, US
Laurence J. Heidelberg - Lakewood OH, US
Edmane Envia - Brunswick OH, US

The United States of America as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

F01D 25/06

416227R, 416229 R, 416233

Low-noise fan exit guide vanes are disclosed. According to the present invention a fan exit guide vane has an outer shell substantially shaped as an airfoil and defining an interior cavity. A porous portion of the outer shell allows communication between the fluctuations in the air passing over the guide vane and the interior cavity. At least one acoustically resonant chamber is located within the interior cavity. The resonant chamber is in communication with the porous portion of the outer perimeter. The resonant chamber is configured to reduce the noise generated at a predetermined frequency. In various preferred embodiments, there is a plurality of acoustically resonant chambers located within the interior cavity. The resonant chambers can be separated by one or more partitions within the interior cavity. In these embodiments, the resonant chambers can be configured to reduce the noise generated over a range of predetermined frequencies.

8111832, Feb 7, 2012

Apr 16, 2009

12/424793

Kennie H Jones - Poquoson VA, US
Douglas M. Nark - Norfolk VA, US
Michael G. Jones - Newport News VA, US
Tony L. Parrott - Williamsburg VA, US
Kenneth N. Lodding - Williamsburg VA, US

The United States of America as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

G10K 11/16

381 711, 415119

A method is provided for making localized decisions and taking localized actions to achieve a global solution. In an embodiment of the present invention, acoustic impedances for impedance-tunable acoustic segments are adjusted. A first acoustic segment through an N-th acoustic segment are defined. To start the process, the first acoustic segment is designated as a leader and a noise-reducing impedance is determined therefor. This is accomplished using (i) one or more metrics associated with the acoustic wave at the leader, and (ii) the metric(s) associated with the acoustic wave at the N-th acoustic segment. The leader, the N-th acoustic segment, and each of the acoustic segments exclusive of the leader and the N-th acoustic segment, are tuned to the noise-reducing impedance. The current leader is then excluded from subsequent processing steps. The designation of leader is then given one of the remaining acoustic segments, and the process is repeated for each of the acoustic segments through an (N−1)-th one of the acoustic segments.

5250764, Oct 5, 1993

Oct 16, 1992

7/961943

Joseph Doychak - Westlake OH
Tony L. Parrott - Williamsburg VA

The United States of America as represented by the Administrator of the
National Aeroneutics and Space Administration - Washington DC

E04F 1704

181224

An apparatus and method for suppressing acoustic noise utilizes consecutive plates, closely spaced to each other so as to exploit dissipation associated with sound propagation in narrow channels to optimize the acoustic resistance at a liner surface. The closely spaced plates can be utilized as high temperature structural materials for jet engines by constructing the plates from composite materials. Geometries of the plates, such as plate depth, shape, thickness, inter-plate spacing, arrangement, etc. , can be selected to achieve bulk material-like behavior.