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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2013, Vol. 34 ›› Issue (9): 2177-2184.doi: 10.7527/S1000-6893.2013.0063

• Solid Mechanics and Vehicle Conceptual Design • Previous Articles     Next Articles

Experimental Study on Structural Dynamic Characteristics of Flexible High-aspect-ratio Wings

FU Zhichao, ZHONG Weiguo, CHEN Zhiping, ZHU Zhenyu, LV Ji'nan, LIU Ziqiang, JIA Yongqing   

  1. China Academy of Aerospace Aerodynamics, Beijing 100074, China
  • Received:2012-11-06 Revised:2012-12-31 Online:2013-09-25 Published:2013-01-28
  • Supported by:

    Ministry Level Project

Abstract:

A novel truck-mounted test scheme is proposed to research the structural dynamic characteristics of a large span high-aspect-ratio wing with the features of large-scale, lightweight, low-frequency and flexibility. To overcome the defects of the traditional modal test approach, an ambient vibration test method with optimized measuring locations is adopted to investigate the structural dynamic characteristics. Therefore a structural dynamic test method for flexible high-aspect-ratio wings with large-scales is established in this study. Both acceleration sensors and fiber Bragg grating (FBG) strain sensors are employed to measure the structural responses during the field test. The eigensystem realization algorithm (ERA) and stochastic subspace identification (SSI) method are then applied to extract modal parameters from the measured data of acceleration and strain response. The identified results show that both the ERA and SSI method results agree well with the finite element method (FEM) result, which demonstrates the feasibility of the truck-mounted scheme for structural dynamic testing. Meanwhile, the agreement between the acceleration result and strain result verifies the validity of the application of FBG strain sensors to structural dynamic testing.

Key words: high-aspect-ratio wing, modal test, truck-mounted test, ambient excitation, eigensystem realization algorithm, stochastic subspace identification, fiber Bragg grating, strain measurement

CLC Number: