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Comparison of Test and Finite Element Analysis for Two Full-Scale Helicopter Crash Tests (Paperback) Loot Price: R306
Discovery Miles 3 060
You Save: R29 (9%)
Comparison of Test and Finite Element Analysis for Two Full-Scale Helicopter Crash Tests (Paperback): Martin S. Annett, Lucas G...

Comparison of Test and Finite Element Analysis for Two Full-Scale Helicopter Crash Tests (Paperback)

Martin S. Annett, Lucas G Horta; Created by Nasa Technical Reports Server (Ntrs)

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List price R335 Loot Price R306 Discovery Miles 3 060 You Save R29 (9%)

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Finite element analyses have been performed for two full-scale crash tests of an MD-500 helicopter. The first crash test was conducted to evaluate the performance of a composite deployable energy absorber under combined flight loads. In the second crash test, the energy absorber was removed to establish the baseline loads. The use of an energy absorbing device reduced the impact acceleration levels by a factor of three. Accelerations and kinematic data collected from the crash tests were compared to analytical results. Details of the full-scale crash tests and development of the system-integrated finite element model are briefly described along with direct comparisons of acceleration magnitudes and durations for the first full-scale crash test. Because load levels were significantly different between tests, models developed for the purposes of predicting the overall system response with external energy absorbers were not adequate under more severe conditions seen in the second crash test. Relative error comparisons were inadequate to guide model calibration. A newly developed model calibration approach that includes uncertainty estimation, parameter sensitivity, impact shape orthogonality, and numerical optimization was used for the second full-scale crash test. The calibrated parameter set reduced 2-norm prediction error by 51% but did not improve impact shape orthogonality.

General

Imprint: Bibliogov
Country of origin: United States
Release date: June 2013
First published: June 2013
Authors: Martin S. Annett • Lucas G Horta
Creators: Nasa Technical Reports Server (Ntrs)
Dimensions: 246 x 189 x 1mm (L x W x T)
Format: Paperback - Trade
Pages: 24
ISBN-13: 978-1-289-09437-9
Categories: Books > Social sciences > Politics & government > General
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LSN: 1-289-09437-3
Barcode: 9781289094379

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