Super Sonic Flight: Frequency Changes in Mach Cone & Shockwave

[brasilr9]

If a sound source flying at a speed faster than a sound, it will produce a Mach cone and shockwave, like the figure. But what will happen if the frequency changes continuously during the flight?

thanks for help!

 

[Tide]

What frequency are you talking about?

 

[brasilr9]

The frequency of the emitted sound from the source.

 

[pallidin]

I'm not understanding the question.
But, if you are looking for a way to mitigate the shock wave, I read somewhere about Air-Force experiments that ionized the surrounding air while in-flight and thus affected the formation of the shock wave.

 

[russ_watters]

A supersonic shock wave is not the sound of the airplane, it's a pressure wave pushed ahead of the plane by the wings, nose, etc. And, afaik, since it's a shock, it doesn't really have any frequency.

 

[Tide]

A supersonic shock wave is not the sound of the airplane, it's a pressure wave pushed ahead of the plane by the wings, nose, etc. And, afaik, since it's a shock, it doesn't really have any frequency.

Actually, it has a very broad spectrum of frequencies. (A temporally narrow pulse has a very broad Fourier transform and vice versa.)