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Proceedings Paper

Lessons learned from wind tunnel testing of a droop-nose morphing wingtip
Author(s): Srinivas Vasista; Johannes Riemenschneider; Bram van de Kamp; Hans Peter Monner; Ronald C. M. Cheung; Christopher Wales; Jonathan Cooper
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Paper Abstract

This work presents the lessons learned from wind tunnel tests of a droop-nose morphing wingtip as part of the EU project NOVEMOR. The design followed a sequential chain and was largely driven through optimization tools, including a glass-fiber composite skin optimization tool and a topology optimization tool for the design of internal super-elastic and aluminium compliant mechanisms. The device was tested in the low speed tunnel at the University of Bristol to determine the structural response under aerodynamic loading. Measurements of strain from strain gauges show that the structure is capable of handing the aerodynamic loads though also show an imbalance of strain between the components. Measurements of surface pressures show a small variation of cp with the 2° droop morphing variation as per the target. The wind tunnel testing showed that further developments to the design chain are necessary, in particular the need for a concurrent as opposed to sequential chain for the design of the various components. Considerations of other problem formulations, the inclusion of nonlinear finite element analysis, and ways to interpret the structural boundary of the topology optimization results with more confidence are required. The utilization of super-elastic materials in morphing structures may also prove to be highly beneficial for their performance.

Paper Details

Date Published: 15 April 2016
PDF: 9 pages
Proc. SPIE 9799, Active and Passive Smart Structures and Integrated Systems 2016, 979929 (15 April 2016); doi: 10.1117/12.2219163
Show Author Affiliations
Srinivas Vasista, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Johannes Riemenschneider, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Bram van de Kamp, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Hans Peter Monner, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Ronald C. M. Cheung, Univ. of Bristol (United Kingdom)
Christopher Wales, Univ. of Bristol (United Kingdom)
Jonathan Cooper, Univ. of Bristol (United Kingdom)

Published in SPIE Proceedings Vol. 9799:
Active and Passive Smart Structures and Integrated Systems 2016
Gyuhae Park, Editor(s)

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