Stick model development of aircraft structures for dynamic analysis

Hayirli U., Kayran A.

58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2017, Texas, United States Of America, 9 - 13 January 2017 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.2514/6.2017-0407
  • City: Texas
  • Country: United States Of America
  • Middle East Technical University Affiliated: Yes


© 2017, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.Finite element methods have been widely used in the analysis of aircraft structures. The models usually consist of large system matrices for the solution of the dynamic response of the aircraft structure. Model reduction techniques are used to condense the finite element models by retaining the dynamic characteristics of the global model. This study presents two different methodologies namely the reduction of system matrices and the constraint force and the concentrated mass method for reducing the global model to generate stick models. Several methods available in literature are used to develop stick models for the sub-structures of the aircraft. Techniques used to create stick models are reviewed, different procedures unique to this study are presented and the effect of the different model reduction methodologies on the accuracy of the dynamic behavior of the stick models is investigated. For the comparison of the presented methodologies, a helicopter tail structure involving tail cone, horizontal and vertical stabilizer is utilized to develop stick models. Numerical examples are presented for the dynamic analysis of the 3D helicopter tail structure and the corresponding stick models to demonstrate the efficiency of the proposed model reduction methods. The results show that the accuracy of stick models generated by the presented methodologies is preserved within a low frequency range.