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Shock and Vibration
Volume 2017 (2017), Article ID 3073524, 11 pages
https://doi.org/10.1155/2017/3073524
Research Article

A Numerical-Experimental Method for Drop Impact Analysis of Composite Landing Gear

1Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 Dong Nanhu Road, Changchun 130033, China
2University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing 100049, China
3Chang Guang Satellite Technology Co., Ltd., Bei Yuanda Street and Longhu Road Interchange, Changchun 130052, China

Correspondence should be addressed to Hongguang Jia; moc.qq@946722593

Received 4 January 2017; Revised 17 February 2017; Accepted 15 May 2017; Published 13 June 2017

Academic Editor: M. I. Herreros

Copyright © 2017 Yongliang Guan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The special material performance, manufacturing process, machining behavior, and operating condition of composite materials cause uncertainties to inevitably appear in the mechanical properties of composite structures. Therefore, variability in mechanical properties must be considered in a mechanical response analysis of composite structures. A method is proposed in this paper to predict the dynamic performance of composite landing gear with uncertainties using experimental modal analysis data and nonlinear static test data. In this method, the nonlinear dynamic model of the composite landing gear is divided into two parts, the linear and the nonlinear parts. An experimental modal analysis is employed to predict the linear parameters with a frequency response function, and the nonlinear parameters caused by large deflection are identified by a nonlinear static test with the nonlinear least squares method. To check the accuracy and practicability of the method, it is applied to drop impact simulations and tests of composite landing gear. The results of the simulations are in good agreement with the test results, which shows that the proposed method is perfectly suited for the dynamic analysis of composite landing gear.