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Rotorcraft External Far-Field Noise Measurement Using a Hot Air Balloon

Award Information
Agency: Department of Defense
Branch: Army
Contract: W911W6-15-C-0001
Agency Tracking Number: A14A-001-0177
Amount: $149,157.00
Phase: Phase I
Program: STTR
Solicitation Topic Code: A14A-T001
Solicitation Number: 2014.A
Timeline
Solicitation Year: 2014
Award Year: 2014
Award Start Date (Proposal Award Date): 2014-10-01
Award End Date (Contract End Date): 2015-04-15
Small Business Information
14660 Latrobe Drive, Suite U3
Colorado Springs, CO -
United States
DUNS: 099021086
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Richard Sickenberger
 Senior Research Engineer
 (443) 655-0865
 RDSicken@dgilink.com
Business Contact
 William Eckert
Title: Operations Manager
Phone: (719) 646-4525
Email: BEckert@dgilink.com
Research Institution
 University of Maryland
 Fredric H Schmitz
 
Dept. of Aerospace Engineering 3181 Glenn L. Martin Hall
College Park, MD 20742-
United States

 (650) 810-5950
 Nonprofit College or University
Abstract

A novel and new method of measuring the far-field noise of a helicopter is proposed by the Delta Group International/University of Maryland team that uses a hot-air-balloon as the measurement platform. The method meets the Army STTR objectives of being capable of measuring helicopter noise above and near the tip-path-plane of the helicopter without measurable ground reflections. The new method is direct (data measuring and reduction procedures are similar to ground based systems) and has many advantages including the ability to take acoustic data at almost any breathable altitude above the ground with almost no background noise. This facilitates acoustic measurements at almost all angular positions and multiple microphone-to-helicopter distances, enabling the development of full spherical representations of helicopter noise over a full range of helicopter flight conditions. The proposed Phase I work will concentrate on mitigating the risk of this approach by developing balloon testing flight procedures, performing a pilot test of this new concept, and designing improvements for a Phase II operational system. The DGI/UMD team believes that the hot air balloon acoustic measurement system will yield seminal acoustic data and, at the same time, minimize costs of acquiring the data.

* Information listed above is at the time of submission. *

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