Abstract #300316

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JSM 2003 Abstract #300316
Activity Number: 206
Type: Contributed
Date/Time: Tuesday, August 5, 2003 : 8:30 AM to 10:20 AM
Sponsor: Section on Physical and Engineering Sciences
Abstract - #300316
Title: A Statistical Look at Damage Dosimeter Drat from a Fighter Aircraft
Author(s): David L. Banaszak*+ and Dansen Brown
Companies: Air Force Research Lab and Air Force Research Lab
Address: 168 Stratmore, New Carlisle, OH, 45344-2934,
Keywords: peak values ; correlations ; distribution ; flight data ; dosimeter ; fatigue
Abstract:

The Air Force uses damage dosimeters to measure temperature and dynamic strains on aircraft. The dosimeter is a small, lightweight, battery-powered data acquisition and processing system programmed to acquire and process data on board the aircraft. Boeing used the dosimeter on a F-15 flight to compute and store 22,548 records during 14,616 seconds of operation (i.e. 1.54 records per second). Boeing provided the Air Force with binary data from this flight. Each record contains a third octave spectrum (18 frequency bands) from three strain gauges based on 2,048 time samples in 0.3 seconds. The record also contains peak strains, temperature, and time. The gauges are in an area subject to structural cracking due to acoustics and high-cycle fatigue. LabVIEWT virtual instruments provide quick look at the third octave data and stores the computed root mean square(rms), peak strains, and temperatures in a spreadsheet for further statistical analysis. This paper contains a test description, time histories of rms data computed from the third octave spectra, distributions of the collected data and correlations between temperature and strains.

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