A novel application of Schlieren imaging : leakage localization in composite manufacturing vacuum bags
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Cosco, Brett Aaron
issued: 2023-04-14T22:45:22Z
issued: 2023
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: Schlieren imaging, a technique that allows for density variations in transparent mediums to be visualized, was brought to prominence in 1864 and is still in use today. This technique has been used to study supersonic motion in aerospace applications, as well as visualizing airflow in speech. Despite the diversity in application and reference to its use as a leak localization tool, there is no literature supporting its use in composite manufacturing vacuum bags. The purpose of this research is twofold. First, a Schlieren system is developed. Second, a novel method of leakage localization in vacuum bags premised on the use of Schlieren imaging is hypothesizes and the results of the experimentation are presented as proof of concept. An introduction to vacuum bag based composite manufacturing and the importance of leakage localization is provided. The standard methods of leakage detection and localization are discussed and analyzed. The analysis culminates in the identification of the need for a noninvasive, quick, and definitive method of leakage localization. Research around methods of detection satisfying these criteria led to the hypothesis that Schlieren imaging is capable of visualizing flow into a leakage allowing for definitive localization. An analysis of the data recorded during the experiments demonstrates the ability for Schlieren imaging to visualize flow entering a vacuum bag at a leak.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/84212
note: A NOVEL APPLICATION OF SCHLIEREN IMAGING: LEAKAGE LOCALIZATION IN COMPOSITE MANUFACTURING VACUUM BAGS by Brett Aaron Cosco B.A.Sc., University of British Columbia, 2020 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in The College of Graduate Studies (Mechanical Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) April 2023 © Brett Aaron Cosco, 2023 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis entitled: A NOVEL APPLICATION OF SCHLIEREN IMAGING: LEAK LOCALIZATION IN COMPOSITE MANUFACTURING VACUUM BAGS submitted by Brett Aaron Cosco in partial fulfillment of the requirements of the degree of Master of Applied Science . Homayoun Najjaran, University of Victoria Supervisor Sumi Siddiqua, School of Engineering Co-Supervisor Abbas Milani, School of Engineering Supervisory Committee Member Jian Liu, School of Engineering Supervisory Committee Member Thomas Johnson, School of Engineering University Examiner iii Abstract Schlieren imaging, a technique that allows for density variations in transparent mediums to be visualized, was brought to prominence in 1864 and is still in use today. This technique has been used to study supersonic motion in aerospace applications, as well as visualizing airflow in speech. Despite the diversity in application and reference to its use as a leak localization tool, there is no literature supporting its use in composite manufacturing vacuum bags. The purpose of this research is twofold. First, a Schlieren system is developed. Second, a novel method of leakage localization in vacuum bags premised on the use of Schlieren imaging is hypothesizes and the results of the experimentation are presented as proof of concept. An introduction to vacuum bag based composite manufacturing and the importance of leakage localization is provided. The standard methods of leakage detection and localization are di…
has type: Thesis/Dissertation
date issued: 2023-05
is shown at: 10.14288/1.0431040
language: eng
degree discipline: Mechanical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Najjaran, Homayoun
contributor: Siddiqua, Sumi
type: Text
identifier URI: http://hdl.handle.net/2429/84212