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Improved models for runway debris lofting simulations

Published online by Cambridge University Press:  03 February 2016

S. N. Nguyen,
E. S. Greenhalgh,
L. Iannucci,
R. Olsson and
P. T. Curtis
S. N. Nguyen
Affiliation:
Department of Aeronautics, Imperial College, London, UK
E. S. Greenhalgh
Affiliation:
Department of Aeronautics, Imperial College, London, UK
L. Iannucci
Affiliation:
Department of Aeronautics, Imperial College, London, UK
R. Olsson
Affiliation:
Swerea SICOMP AB, Mölndal, Sweden
P. T. Curtis
Affiliation:
Physical Sciences Department, Dstl Porton Down, Salisbury, Wiltshire, UK
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Abstract

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Numerical models used to simulate the lofting mechanisms of runway stones were developed to assess the threat to aircraft structures from runway debris impacts. An inflated aircraft tyre model, which was validated by comparison with experimental indentation tests, showed that over-rolling of stones under typical take-off conditions led to only modest vertical loft velocities of less than 5 m/s. Experiments using a drop weight impactor simulated a section of aircraft tyre descending upon stones. These tests demonstrated that lofting was achieved for impacts with low rubber thickness. However, for impacts with greater rubber thickness, lofting was suppressed. Using more realistic tyre geometries resulted in launches with backspin, but only horizontally along the ground in the direction of the tyre axis. The speed at which launches occurred was proportional to the rate of descent of the tyre section and would consequently determine the loft speeds due to potential asperity lofting.

Information

Type
Research Article
Information
The Aeronautical Journal , Volume 113 , Issue 1148 , October 2009, pp. 669 - 681
Copyright
Copyright © Royal Aeronautical Society 2009 

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