Abstract

Mechanical instabilities and elastic nonlinearities are emerging engineering means for designing shape-changing devices. In this paper, we exploit the taxonomy of post-buckling behaviours of a glass-fibre panel to design an adaptive air inlet that passively regulates the fluid flow into a connected duct. The adaptive component controls the inlet aperture by snapping open and closed depending on the velocity and pressure of the surrounding fluid. Sensing, actuation and control is entirely governed by the characteristics of the post-buckled component. Post-buckling stresses - induced in the composite panel by suitably applying compressive and bending loads - create the intrinsic characteristics of stability required for the panel to snap-through and snap-back. Furthermore, the associated post-buckled shape creates the aerodynamic pressure fields required for actuation. This design concept is explored and validated here by means of wind tunnel experiments. The passive actuation and control mechanism presented is particularly valuable for fluid control applications where simplicity and mass-minimisation are critical.

Original languageEnglish
Article number085019
Number of pages11
JournalSmart Materials and Structures
Volume27
Issue number8
Early online date11 Jul 2018
DOIs
Publication statusPublished - 11 Jul 2018

Keywords

  • adaptive inlet
  • buckling
  • design tool
  • elastic instabilities
  • morphing structures
  • post-buckling
  • wind tunnel

Fingerprint Dive into the research topics of 'Design and testing of a passively adaptive inlet'. Together they form a unique fingerprint.

  • Projects

    Student Theses

    Adaptive Compliant Structures for Fluid Flow Control: A ‘catastrophic’ approach

    Author: Arena, G., 7 May 2019

    Supervisor: Pirrera, A. (Supervisor), Groh, R. (Supervisor) & Theunissen, R. (Supervisor)

    Student thesis: Doctoral ThesisDoctor of Philosophy (PhD)

    File

    Prizes

    Royal Academy of Engineering Research Fellow

    Groh, Rainer (Recipient), 2018

    Prize: Prizes, Medals, Awards and Grants

  • Datasets

    Cite this