Essay about Flute Acoustics - 546 Words

A flute blows a rapid jet of air across the embouchure hole. The pressure inside the players mouth is above atmospheric (usually 1kpa: just enough to support a 10cm height difference in a water manometer). (http://newt.phys.unsw.edu.au/music/) The work done to accelerate the air in this jet is the source of power input to instrument. Sound requires an oscillating motion or air flow. In the flute, the air jet, and the resonance in the air in instrument produces an oscillating component of the flow. As the air starts to vibrate some of the energy (sound ) is radiated out the ends and through any open holes. Most of the energy is lost as a sort of friction (viscous loss) with the walls. The pitch or note can be altered very slightly by†¦show more content†¦The air stream uses energy imparted to it by these pushes to start vibrating on its own natural rhythm. This natural rhythm is determined by the length of the air spring. (http://www.markshep.com/flute/Acoustics.html). The movement of the air in the tube becomes a series of contractions and expansions. Since the air spring has a constricted nature, it absorbs some of the energy that is imparted to it, so it starts to grow in strength. Before long it will over power the weak fluctuations at the mouth hole and makes its own rhythm. It makes the vibration build to a point at which it can vibrate the air around it, and a note is heard. (http://www.markshep.com/flute/Acoustics.html#Tube) Since the flute is open to the air at the ends the total pressure is close to atmospheric pressure. So the acoustic pressure is close to zero. In order for a wave to satisfy this condition the longest standing wave is one in which its wavelength is twice as long as the flute! The pressure inside the tube does not have to be atmospheric. Websters dictionary defines a wave as, A disturbance or variation that transfers energy progressively from point to point in a medium and that may take the form of an elastic deformation or of a variation of pressure, electric or magnetic intensity, electric potential, or temperature. During a pep rally or a big game have you ever done the wave. It is when a large group of people jumps upShow MoreRelatedThe Court Of The Crimson King1576 Words   |  7 Pagesseconds of psychedelic cacophony – which is simply too much for many listeners. The second track, â€Å"I Talk to the Wind†, provides a mellow rest after the dense amalgamation of noises towards the conclusion of the first track. The song starts with a flute, before a double-tracked harmony vocal begins the main section of the song. It is a slow ballad, where the complex drum lines are a lot lower in the mix, which allows for a softer, more melodic direction. 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