Accession Number:

ADA459690

Title:

Active Control of Blade Tonals in Underwater Vehicles

Descriptive Note:

Technical report

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

2006-12-01

Pagination or Media Count:

21.0

Abstract:

The goal of this proposal is to achieve stealth through the reduction or alteration of radiated noise that produce blade tonals in underwater vehicles. The use of active control that is judiciously integrated with passive control is proposed to realize which consists of intentional articulation of suitable surfaces or boundary conditions in the vehicle so as to modify the relevant noise characteristics. By modulating additional surfaces, biological organisms appear to affect lift, drag, and related wake producing features, a combination of which may lead to a modification of the underlying acoustic characteristics. Our thesis is that by distilling some of the fundamental features of these mechanisms, and suitably accommodating them in underwater vehicles, significant changes in the noise production can be made by expending very little energy. By modulating suitable foils and components as a function of the flow-field around the vehicle at appropriate spatial locations and time-scales, the goal is achieve significant change in the gust amplitudes and resulting noise production. The aim of this proposal is therefore to determine active biomimetic control methods for reducingaltering blade tonal signatures.

Subject Categories:

  • Submarine Engineering
  • Acoustics
  • Fluid Mechanics
  • Undersea and Antisubmarine Warfare

Distribution Statement:

APPROVED FOR PUBLIC RELEASE