Abstract
This research group has recently used the new technology Distributed Acoustic Sensing (DAS) for the monitoring and the measurement of airplane flutter. To the authors’ knowledge, this is the first such use for this new technology. Traditionally, the measurement of airplane flutter requires the mounting of a very large number of sensors on the wing being monitored, and extensive wiring must be connected to all these sensors. The new system and technology introduced in this paper dramatically reduces the hardware requirements in such an application: all the traditional sensors and wiring are replaced with one fiber optic cable with a diameter of 2 mm. An electro-optical system with the size of a desktop PC monitors simultaneously one or more of such fiber optic cables and detects/characterizes any mechanical disturbances on the cables. Theoretical and experimental results are given.
Highlights
Flutter is a dangerous phenomenon that occurs when an airplane is moving at certain high speeds [1,2]
Distributed Acoustic Sensing (DAS) will be a very attractive technology because all the hardware that is required to be installed inside a wing or a control surface is just one fiber optic cable, with an overall diameter of 2 mm
A large model airplane was tested in a wind tunnel
Summary
Flutter is a dangerous phenomenon that occurs when an airplane is moving at certain high speeds [1,2]. The hardware requirement is even made worse by the fact that wiring must be connected to all those sensors For this reason, the actual measurement of flutter in production airplanes is impractical and not implemented by aircraft manufacturers at the present time. Aerospace 2020, 7, 125 minimal hardware: just one fiber optic cable, with a diameter of 2 mm, that runs through each wing or control surface in the aircraft. Knowledge, DAS has not yet been used in the application of flutter measurement In this application, DAS will be a very attractive technology because all the hardware that is required to be installed inside a wing or a control surface is just one fiber optic cable, with an overall diameter of 2 mm. The DAS system drives the 4 fiber optic cables as shown in the figure
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