Membrane wing dynamic stability: The role of membrane mass

Sonya Tiomkin, Daniella E. Raveh

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

A computational study of the dynamic stability of a two-dimensional membrane wing in laminar steady flow is presented, with a focus on the role of membrane mass. The membrane is assumed to be linearly elastic, and no supports are used in the membrane model. The study focuses on small mass ratios of µ ≤ 1, which are most relevant in today’s membrane-wing applications, and small AoAs, for which the massless membrane solution predicts a stable solution. For very small AoAs the membrane is stable, in accordance with the massless solution. As the AoA is increased, the membrane loses stability via limit-cycle oscillations (LCO). The instability threshold depends on the membrane mass-ratio such that any increase in the mass-ratio increases the AoA of LCO onset. Membrane oscillations improve the mean aerodynamic characteristics of the airfoil, presenting significantly higher lift-slope than stable membranes. Dynamic mode decomposition analysis revealed that membrane-oscillations appear with a dominant mode-shape that is very similar to the second structural mode, and a frequency that is slightly lower than the structural frequency. A simple mathematical model is suggested for predicting the membrane-stability in the studied cases.

Original languageEnglish
Title of host publicationAIAA Aerospace Sciences Meeting
DOIs
StatePublished - 2018
EventAIAA Aerospace Sciences Meeting, 2018 - Kissimmee, United States
Duration: 8 Jan 201812 Jan 2018

Publication series

NameAIAA Aerospace Sciences Meeting, 2018

Conference

ConferenceAIAA Aerospace Sciences Meeting, 2018
Country/TerritoryUnited States
CityKissimmee
Period8/01/1812/01/18

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

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