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Development and promotion
in the field of:
"Acoustics Materials and Containers
for Absorbing"Noise".

 

 

 

 

 

 

 

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Flying and Engine Noise
Exhaust and
Muffler Pipe Systems


Originally posted in 2005 (with revisions 2009*)

Background "Noise" is regarded as one of the significant sources of the harmful environmental effects of new technology.

Vehicle road noise is a "white noise" we all get use to, but lessens the quality of the outdoors in the city. Many previous studies were under taken, particularly in the reduction of the noise.

Among the ways of research considered:

  1. Reduction in the production of the noise: this supposes a work of "aero acoustics" analysis on the identification and the control of the sources of noise.
  2. The absorption/reduction of background noise: this supposes the use of systems having properties of acoustic absorption. Generally these systems can be multifunction (also assuming a structural and/or anti-crash role) and employ materials that absorb with or without active control of the impedance.
  3. Orientation of the produced noise: this supposes work on the acoustic propagation in order to be able to trace charts of acoustic ISO intensity, thus carrying out perimeters of demarcation of the sounds harmful effect.
There should be a Canadian Study that aims at establishing a synergy between the industrial needs and the state of the art, as well as the developments to be promoted in the field of Acoustics Materials for Absorbing "Noise".
 


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Acoustics Materials and Containers for Absorbing Noise

Engine Design Practices


Setting up an established set of rules or parameters would be first before using a modelling program to sketch out a new engine design for the gyrocopter. There are very few engines designed specifically for gyroplanes. Most have been automotive conversions.

Once the software perimeters and guidelines have been established, all gyroplane engines, in the design stage, could be tested at the modelling stage for acoustical noise levels. Reducing the noise factor is paramount in allowing gyroplanes over residential areas.
However, keeping up the engine horsepower is priority number one.
Estimated noise levels:
1-rotors: almost make no noise at all
5-carb: noise is the residue sound of the fuel explosion escaping past the opening intake valves.
7-exhaust: noise is the result of fuel explosions which push the engine pistons down.
9-propeller: noise is generated by a slapping sound at the trailing edge of the blade, caused by a partial vacuum formed and filled as the blade divides the air.

Currently an electric powered gyroplane is over a decade away in development.

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Revisions: * Regalpony Paper.
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