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Your search keyword '"Gaal, M"' showing total 2 results
Start Over Author "Gaal, M" Topic ultrasonic testing
2 results on '"Gaal, M"'

1. Ferroelectret transducers for air-coupled ultrasonic testing of fiber-reinforced polymers.

Author

Gaal, M., Döring, J., Bartusch, J., Lange, T., Hillger, W., Brekow, G., and Kreutzbruck, M.

Subjects
*FERROELECTRIC devices, *ULTRASONIC testing, *FIBER-reinforced plastics, *ULTRASONIC transducers, *POLYPROPYLENE, *COMPARATIVE studies, *SIGNAL-to-noise ratio
Abstract

Ferroelectrets are promising materials for air-coupled ultrasonic transducers. A transducer made of polarized cellular polypropylene, including its electronic interface, was developed and compared with conventional air-coupled probes. Test pieces of fiber-reinforced polymer containing impact flaws and flat-bottom holes were inspected in transmission. The ferroelectret transducers achieved a considerably higher signal-to-noise ratio. The impacts were clearly visible with all transducers, but less noisy with ferroelectret transducers. The flat-bottom holes were better detectable than with a conventional probe with about the same focus size. [ABSTRACT FROM AUTHOR]

Published
2013
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2. Investigating human factors in manual ultrasonic testing: testing the human factors model.

Author

Bertovic, M, Gaal, M, Müller, C, and Fahlbruch, B

Subjects
*ULTRASONIC testing, *NUCLEAR power plants, *MANUFACTURING processes & ergonomics, *PERFORMANCE evaluation, *MANUFACTURING process management
Abstract

The human factors approach relies on understanding the properties of human capability and limitations under various conditions and the application of that knowledge in designing and developing safe systems. Following the principles of the MTO (Man Technology Organisation) approach, emphasis should be given to the way people interact with technical as well as organisational systems. A model describing human factor influences in relation to the performance shaping factors and their effect on manual ultrasonic inspection performance had been built and a part of it empirically tested. The experimental task involved repeated inspection of 18 defects according to the standard procedure under no, middle and high time pressure. Stress coping strategies, the mental workload of the task, stress reaction and organisational factors have been measured. The results have shown that time pressure, mental workload and experience influence the quality of the inspection performance. Organisational factors and their influence on the inspection results were rated as important by the operators. However, further research is necessary into the effects of stress. [ABSTRACT FROM AUTHOR]

Published
2011
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