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Proceedings Paper

Durability patch and damage dosimeter: a portable battery-powered data acquisition computer and durability patch design process
Author(s): Eric D. Haugse; Patrick E. Johnson; David L. Smith; Lynn C. Rogers
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Paper Abstract

Repairs of secondary structure can be accomplished by restoring structural integrity at the damaged area and increasing the structure's damping in the repair region. Increased damping leads to a reduction in resonant response and a repair that will survive for the life of the aircraft. In order to design a repair with effective damping properties, the in-service structural strains and temperatures must be known. A rugged, small and lightweight data acquisition unit called the Damage Dosimeter has been developed to accomplish this task with minimal impact to the aircraft system. Running autonomously off of battery power, the Damage Dosimeter measures three channels of strain at sample rates as high as 15 kilo-samples per second and a single channel of temperature. It merges the functionality of both analog signal conditioning and a digital single board computer on one 3.5 by 5 inch card. The Damage Dosimeter allows an engineer to easily instrument an in-service aircraft to assess the structural response characteristics necessary to properly select damping materials. This information in conjunction with analysis and design procedures can be used to design a repair with optimum effectiveness. This paper will present the motivation behind the development of the Damage Dosimeter along with an overview of its functional capabilities and design. In-service flight data and analysis results will be discussed for two applications. The paper will also describe how the Damage Dosimeter is used to enable the Durability Patch design process.

Paper Details

Date Published: 5 May 2000
PDF: 12 pages
Proc. SPIE 3994, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware IV, (5 May 2000); doi: 10.1117/12.385017
Show Author Affiliations
Eric D. Haugse, Boeing Phantom Works (United States)
Patrick E. Johnson, Boeing Phantom Works (United States)
David L. Smith, Boeing Phantom Works (United States)
Lynn C. Rogers, CSA Engineering (United States)

Published in SPIE Proceedings Vol. 3994:
Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware IV
Ajit K. Mal, Editor(s)

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