Remote-Controlled Rotorcraft Blade Vibration and Modal Analysis at Low Frequencies

Report No. ARL-MR-0919
Authors: Natasha C Bradley
Date/Pages: February 2016; 18 pages
Abstract: Health and usage monitoring systems (HUMSs) collect sensor data from vehicle mechanical systems, subsystems, and components to address issues related to safety, maintenance, and reliability of vehicles. The US Army encourages open HUMS architectures. A typical HUMS box collects data during flight and stores the data for further analysis to determine the current state, reliability, and safety of the vehicle. This HUMS study collects sensor data on a blade removed from a remote-controlled rotorcraft as a surrogate for a full-size rotorcraft blade. This report explains the outcome of the study and details how HUMs data can be collected on rotorcraft blades. This report will also demonstrate that accelerometers can be used to ascertain the natural frequencies of these blades, such that vibratory testing can be controlled and used to ultimately determine if the blade damage, wear, age, etc. has a measurable effect on frequency response.
Distribution: Approved for public release
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Last Update / Reviewed: February 1, 2016