The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 25, 2011
Filed:
Sep. 18, 2009
Stephen A. Huyer, Saunderstown, RI (US);
Daniel L. Macumber, Thornton, CO (US);
Anuradha Annaswamy, West Newton, MA (US);
David N. Beal, Providence, RI (US);
Stephen A. Huyer, Saunderstown, RI (US);
Daniel L. Macumber, Thornton, CO (US);
Anuradha Annaswamy, West Newton, MA (US);
David N. Beal, Providence, RI (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
The invention as disclosed is an apparatus that controls the wake of stator blades on an underwater vehicle. The apparatus comprises one or more stator blades each with a movable trailing edge that when actuated in a controlled manner produces a periodic flapping motion upstream of a propulsion rotor. The controlled periodic flapping of the trailing edge the fills the stator blade wake enough to overcome the stator blade's own drag and fill its wake deficit. This has the effect of reducing the blade rate tonal noise of the propulsion rotor.