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Development of a Vision-Based Particle Tracking Velocimetry Method and Post-Processing of Scattered Velocity Data

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dc.contributor.advisor Dabiri, Dana en_US Paul, Micah Philip en_US 2012-08-10T20:35:53Z 2012-08-10T20:35:53Z 2012-08-10 2012 en_US
dc.identifier.other Paul_washington_0250O_10176.pdf en_US
dc.description Thesis (Master's)--University of Washington, 2012 en_US
dc.description.abstract In this thesis, a new vision-based hybrid particle tracking velocimetry (VB-PTV) technique is described and methods of processing randomly scattered velocity data investigated. The VB-PTV technique uses a feature matching method from computer vision theory which relies on the principles of proximity, similarity, and exclusion, meaning that it seeks to match one feature to one feature in subsequent images, and it favors matches which are close to one another and "look" similar. By constructing a matrix which takes these principles into account and performing singular value decomposition, a straightforward method of matching is developed which can give accurate matching results in a wide variety of flows. PIV velocity information is used to provide guidance to the matching algorithm. In addition, matches are made iteratively and validated by an outlier detection scheme. When this method is tested on synthetic images it results in matches which are typically reliable more than 98% of the time. A simple modification to the principle of proximity is introduced which reduces the PTV method's errors in highly shearing flow, as well as improving performance in general for various flow types. Finally, a natural neighbor-based interpolation technique is investigated for use in estimating flow derivatives using scattered velocity data. This interpolation method is compared with other existing techniques in terms of accuracy, sensitivity to noise, computational efficiency, and spatial resolution. It is found that the natural neighbor interpolation is less accurate than RBF and kriging interpolation methods, and more sensitive to noise, despite the use of a denoising technique. en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.subject natural neighbors; particle tracking; particle velocimetry; PIV; PTV; scattered data interpolation en_US
dc.subject.other Aerospace engineering en_US
dc.subject.other Aeronautics and astronautics en_US
dc.title Development of a Vision-Based Particle Tracking Velocimetry Method and Post-Processing of Scattered Velocity Data en_US
dc.type Thesis en_US
dc.embargo.terms No embargo en_US

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