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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Methodology design and proper measurement setting evaluation of ultrasound testing of composite propellers
 Běhal, Antonín ; Horák, Marek (referee) ; Katrňák, Tomáš (advisor)
This thesis focuses on non-destructive ultrasonic testing of composite aircraft propellers. The theoretical part contains a review of manufacturing technologies of laminate propellers and their design. The practical part of the thesis contains the design of ultrasonic testing methodology. Dolphicam 2+ device is used for testing. The creation of appropriate settings of the ultrasonic device, for different laminate thicknesses, is performed on calibration samples containing artificially created defects. By comparing the default and modified settings, it was found that the use of the modified settings greatly improves the distinguishability of the defects from the defect-free laminate. Confirmation of the functionality of the modified setup is performed using a real propeller test. The work serves as a sample procedure for testing a laminate propeller by ultrasonic defect detection.
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Methodology design of ultrasound testing of composite propellers
 Horňák, Pavel ; Černoch, Jakub (referee) ; Katrňák, Tomáš (advisor)
Non-destructive testing is a big concept in the field of aerospace composites. In particular, the ultrasonic defectoscopy method, the application of which to laminate aircraft propellers is the main interest of this paper. The introductory chapters introduce the propellers and the material used for their manufacturing. The focus is then on the process of manufacturing laminate propellers from carbon and glass fibre. From a selection of non-destructive methods, a recommended methodology relying mainly on ultrasonic defectoscopy is compiled. The selected Dolphicam 2+ device is described with its features and its settings calibrated on a manufactured test specimen containing predefined artificial structure defects. The evaluation shows a significant improvement in the visibility of individual defects located at different depths by using the calibrated setup. The improvement is quantified by the amplitude gain of the received signal compared to the signal captured using the default setting. The resulting output are specific recommendations for both setup changes and propeller ultrasonic testing methodologies along with real-world application. The work thus serves as a template for ultrasonic defectoscopy of laminate propellers not only for the device mentioned.
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