Why does an airplane actually make so much noise? How can we make them quieter? What exactly is noise? In this video, Marijn Sanders, a sound expert at the University of Twente, answers all these questions. The air that moves past the aircraft parts is primarily the culprit. And this can be tackled with various smart techniques. But less nuisance requires more than just technology...

0:00 Why should planes be quieter?
1:00 What is sound, and what is noise?
1:30 Investigating aircraft noise in a wind tunnel
2:05 No echo in the room!
2:30 Watching sound
3:20 How do you measure an entire airplane?
4:02 The wing
4:15 The angle of the air is the cause
4:40 The valves determine the sound
5:28 The landing gear
6:00 A sound source sends sound in one direction
6:28 Turbulence around the landing gear
6:28 A string disrupts turbulence
7:10 The jet engine
7:20 More thrust, more wind, more noise
8:22 Smart tricks make the engine quieter and more efficient
9:20 Reducing noise is not the only solution
9:40 Other tones are less annoying to us
10:00 Adjusting flight routes and the living environment

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