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Surface pressure reconstruction from phase averaged deflectometry measurements using the virtual fields method

Surface pressure reconstruction from phase averaged deflectometry measurements using the virtual fields method
Surface pressure reconstruction from phase averaged deflectometry measurements using the virtual fields method
In this study, pressure distributions were reconstructed from phase-locked surface deformation measurements on a thin plate. Slope changes on the plate surface were induced by an external flow interacting with the specimen and measured with a highly sensitive deflectometry setup. The Virtual Fields Method (VFM) was used to obtain pressure reconstructions from the processed surface slopes and the plate material constitutive mechanical parameters. The applicability of the approach in combination with phase-locked measurements is demonstrated using a synthetic jet setup generating a periodic flow in air. Phase-averaging slope data allows mitigating random noise effects and resolving low-range differential pressure amplitudes despite the turbulent flow. The size of the spatial structures of the investigated low amplitude flow events identified in full-field with the present method are O(1) mm, which is beyond the capabilities of other available surface pressure measurement techniques. Challenges and limitations in achieving the metrological performance for resolving the observed surface slopes of O(0.1) mm km−1 are described and improvements for future applications are discussed.
Deflectometry, Dynamic pressure, Full-field measurement, Surface pressure, Virtual Fields Method
1741-2765
379-392
Kaufmann, R.
a0e0bbcd-2cf6-47b9-97fd-c17dd3b8f658
Ganapathisubramani, B.
0097a836-da70-4a2e-a9d7-f60ca01b6089
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Kaufmann, R.
a0e0bbcd-2cf6-47b9-97fd-c17dd3b8f658
Ganapathisubramani, B.
0097a836-da70-4a2e-a9d7-f60ca01b6089
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4

Kaufmann, R., Ganapathisubramani, B. and Pierron, F. (2020) Surface pressure reconstruction from phase averaged deflectometry measurements using the virtual fields method. Experimental Mechanics, 60 (3), 379-392. (doi:10.1007/s11340-019-00564-6).

Record type: Article

Abstract

In this study, pressure distributions were reconstructed from phase-locked surface deformation measurements on a thin plate. Slope changes on the plate surface were induced by an external flow interacting with the specimen and measured with a highly sensitive deflectometry setup. The Virtual Fields Method (VFM) was used to obtain pressure reconstructions from the processed surface slopes and the plate material constitutive mechanical parameters. The applicability of the approach in combination with phase-locked measurements is demonstrated using a synthetic jet setup generating a periodic flow in air. Phase-averaging slope data allows mitigating random noise effects and resolving low-range differential pressure amplitudes despite the turbulent flow. The size of the spatial structures of the investigated low amplitude flow events identified in full-field with the present method are O(1) mm, which is beyond the capabilities of other available surface pressure measurement techniques. Challenges and limitations in achieving the metrological performance for resolving the observed surface slopes of O(0.1) mm km−1 are described and improvements for future applications are discussed.

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Accepted/In Press date: 18 November 2019
e-pub ahead of print date: 18 December 2019
Published date: 1 January 2020
Keywords: Deflectometry, Dynamic pressure, Full-field measurement, Surface pressure, Virtual Fields Method

Identifiers

Local EPrints ID: 441458
URI: http://eprints.soton.ac.uk/id/eprint/441458
ISSN: 1741-2765
PURE UUID: d204e63a-b2b5-482c-9816-9d5ddbf22791
ORCID for F. Pierron: ORCID iD orcid.org/0000-0003-2813-4994

Catalogue record

Date deposited: 12 Jun 2020 16:40
Last modified: 26 Nov 2021 06:34

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Contributors

Author: R. Kaufmann
Author: B. Ganapathisubramani
Author: F. Pierron ORCID iD

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