Aerodynamic "Noise" Cancellation For Cars

Aerodynamic “Noise”

There is a flaw in the way cars are designed and tested which I believe may impair their performance... And that is the aerodynamics and wind tunnel testing.

The flaw, or oversight, lies in the fact that when a car's aerodynamic properties are considered and designed, they only take account of the shape of the car as it would cut through what I would call “perfect air”, and that the car itself is moving exclusively in one direction into this perfect air.
This false belief and subsequent design philosophy is then reinforced in the designers minds when the car is tested under equally false aerodynamic testing conditions in the wind tunnel.

The static, and/or driven car on uni-formally smooth rollers which simulates driving conditions through the approaching wind generated by the wind machine from one exclusive undeviating direction does not account for the conditions of the actual road surface it will be driven on when in real use by the eventual purchaser... in fact, the only time it will encounter these design conditions is on the designer's easel or in this wind tunnel.

...Why is this important?

In spite of the efforts of even the most advanced and high specification car manufacturers to produce a car of the highest build quality using the most expensive and smooth materials, and fitted in the most ostensibly aerodynamic shapes in the final form of the car's body... if it does not take account of even the slightest vibration transmitted from the ever changing road surface through the body, and expressed ultimately in the fluctuating profile of the car body in the equally changing wind effect conditions, then the aerodynamic properties of the car will change with equivalent frequency, and to corresponding extremes.

The most minute bump on the surface of the car, even to the level of the grain in the paint work will be amplified in greater proportions at increasing levels of speed, and produce resistance and drag, by disturbing the air on contact at the foremost end and carrying this flutter, or “noise” transmitted from the road over the length of the vehicle with increasing levels of disturbance generated, and added to, by each successive variation in that surface (the front of the car, by this virtue, is more aerodynamic than the back).


Active Aerodynamic Bodywork Tuning

So to overcome this I propose 'tuning' the car's surfaces and aerodynamic profile as it goes, as well as the engine.

This could be done by vibrating the bodywork itself, or by attaching sub-surfaces under the bodywork which will cause it to vibrate... taking the vibrations of the road, and those of the first contact point of the air at the front of the car, and compensating in the vibrations they cause, and so cancelling their effects.

The reduction in aerodynamic noise will make the existing aerodynamic materials and shapes more effective in their purpose , so improving performance in terms of both speed, and fuel efficiency.
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badfaith

badfaith

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