Data Acquisition System Design and Validation to Record Interior Cabin Noise Levels of Aircraft
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Aircraft crew members and maintenance personnel are subject to significantly high sound pressure levels. Cumulative exposure to such high levels could induce hearing loss. Therefore, choosing the optimal hearing protector is of the utmost importance. The equipment used to measure the sound levels in the aircraft cabin for helmet selection must be subjected to airworthiness regulations to be flown. This thesis documents the selection, implementation and validation of an in-flight data acquisition system. The signal route is characterized with digital signal processing theory and a comparison to LMS Test.LAB acoustic analysis software. Bell 412 in-flight data is presented to validate the measurement method. The main rotor and tail rotor harmonics were found to dominate the low frequency sound pressure levels. The analysis concluded that the SPH 5CF helmet satisfies the Canadian Labour Code Part II for in-flight occupant noise exposure limit of a maximum of 87 dBA for eight hours.
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Copyright © 2015 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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