ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Research on Civil Aircraft Elastic Structure Ditching Test Load
Received date: 2013-07-18
Revised date: 2013-10-07
Online published: 2013-10-21
Supported by
CCTIME Civil Aircraft Research Project
Load transfer is different between rigid model and elastic structure model. In order to research the impact of rigid model and an elastic structure model on ditching loads, a rigid model is designed and manufactured, based on the principle of dynamic similarity and the elastic structural part is designed and manufactured based on the principle of strength similarity, which is validated by an airbag loading test system. Through the ditching model tests acceleration-time history curves are obtained and peak acceleration value is obtained by processing the experimental data with Fourier transform. According to the rigid model experimental data analysis, the aircraft is subjected to a relatively small load in ditching with the following parameters: pitch 12°, flaps in landing configuration for minimum speed and middle center of gravity. The results indicate that the load is obviously different on the model with an elastic structural part and on the rigid model. The peak value of vertical acceleration of the model with elastic structure part is obviously smaller than that of the rigid model. This phenomenon is mainly due to energy absorption by the bottom elastic structure of fuselage.
Key words： ditching; dynamic models; Froude number; similarity; elastic structure; civil aircraft
XU Wenmin , LI Kai . Research on Civil Aircraft Elastic Structure Ditching Test Load[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(4) : 1012 -1018 . DOI: 10.7527/S1000-6893.2013.0416
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