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Japan Aerospace Exploration Agency

FQUROH (Flight Demonstration of Quiet Technology to Reduce Noise from High-lift Configurations) project

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March 31, 2014

Researchers measure noise sources on the "Hisho" experimental aircraft at Noto Airport

In September 2013, JAXA conducted fly-over noise measurements with its Jet Flying Test Bed (JetFTB), "Hisho," at Noto Airport.
As a preparatory step in verifying noise reduction techniques through series of flight tests planned for the next few years, the noise measurements with the Jet FTB "Hisho" were performed without applying any special noise reduction devices. The purposes of the noise measurements were to identify noise sources from the flaps and landing gear of JetFTB, improve JAXA’s noise measurement techniques, and establish a measurement system at Noto Airport.
Researchers set up a phased array with 195 microphones next to the Noto Airport runway. JetFTB flew over the array 90 times at an altitude of 60 to 120 meters to measure the noise levels of JetFTB in several configurations (different flap deflection angles/landing gear up or down), in various flight paths (level, descending, and climbing), and at a few engine thrust levels.

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