Some Effects of Flight Path and Atmospheric Variations on the Boom Propagated from a Supersonic Aircraft

... T r distance along ray path IN unit vector in ray - path direction S distance along flight path T radius of torsion of flight path t time at wave front € = t - T u , v components of wind velocity along X- and y - axes V airplane ...

Some Effects of Flight Path and Atmospheric Variations on the Boom Propagated from a Supersonic Aircraft

Equations for the shock wave envelope and cusp line associated with the boom propagated from a supersonic aircraft are formulated in terms of the moving-trihedral coordinate system for flight in a uniform atmosphere and also in an atmosphere with a linear sound-speed gradient. Ray-tube theory is used to calculate the lateral distribution of boom intensity in an atmosphere with a linear sound-speed gradient and also to investigate the effect of a general wind and sound-speed gradient on the ground-track intensity. The relative effects of wind and temperature gradient are treated. The mechanism of focusing by winds and by ground structures are discussed qualitatively.

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