An Experimental Study of the Effects of a Nonlinear Store on the Steady-State Dynamics of a Test Airplane

Timothy Copeland, Jon Dewitt Dalisay, Lawrence Bergman, Alexander Vakakis

Research output: Contribution to journalConference articlepeer-review


Local nonlinearities can affect the global dynamics of their linear host structures. In the context of fixed-wing aircraft, failure of store mounting can result in strong local nonlinearities. In this work, we experimentally mimic store mounting failure conditions in a model airplane subject to harmonic excitation. Two identical stores are mounted under the wings and are placed symmetrically opposite each other. The configuration where both stores are "locked", i.e., mounting is very stiff, serves as the baseline linear system. The second configuration involves unlocking one of the stores, enabling a geometrically nonlinear flexure connection between the unlocked store and the wing. The flexure lets the store interact with the first flexible mode of the airplane, resulting in large relative displacements between the store and wing. In addition, the configuration allows for vibro-impacts between the wing and store. Results show that the strong local vibro-impacts enable excitation of high-frequency modes unexcited in the baseline linear system. This is indicative of energy transfer from low to high frequency modes of the primary structure.

Original languageEnglish (US)
JournalSAE Technical Papers
Issue number2021
StatePublished - Aug 31 2021
Externally publishedYes
EventSAE 2021 Noise and Vibration Conference and Exhibition, NVC 2021 - Virtual, Online, United States
Duration: Sep 7 2021Sep 10 2021

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering


Dive into the research topics of 'An Experimental Study of the Effects of a Nonlinear Store on the Steady-State Dynamics of a Test Airplane'. Together they form a unique fingerprint.

Cite this