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Prediction of SR-71 sonic booms by THOR and Thomas codes
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A major concern of recent sonic boom work has been accounting for the effects of molecular relaxation on sonic boom waveforms. Several new codes accounting for these effects have been developed since sonic boom research was reinitiated. In order to validate these codes, sonic boom signatures generated by an SR-71 aircraft have been measured near the aircraft and at several altitudes below the aircraft and on the ground. In the current study, two computer codes, the Thomas code and a highly modified version of THOR, have been used to propagate some of the sonic boom waveforms measured near the SR-71 aircraft to the ground, and to altitudes at which the waveforms have been measured. The results of this study will be presented. The results from the Thomas code provide two things. First, they provide an indication of the prediction capability available when the current sonic boom research began. Second, they provide an indication of the validity of the results provided by THOR, by providing reasonable estimates of overall signal length and amplitude. The results from THOR provide an indication of the capability provided by the research supported in the last few years.
Acoustical Society of America (ASA)
Title: Prediction of SR-71 sonic booms by THOR and Thomas codes
Description:
A major concern of recent sonic boom work has been accounting for the effects of molecular relaxation on sonic boom waveforms.
Several new codes accounting for these effects have been developed since sonic boom research was reinitiated.
In order to validate these codes, sonic boom signatures generated by an SR-71 aircraft have been measured near the aircraft and at several altitudes below the aircraft and on the ground.
In the current study, two computer codes, the Thomas code and a highly modified version of THOR, have been used to propagate some of the sonic boom waveforms measured near the SR-71 aircraft to the ground, and to altitudes at which the waveforms have been measured.
The results of this study will be presented.
The results from the Thomas code provide two things.
First, they provide an indication of the prediction capability available when the current sonic boom research began.
Second, they provide an indication of the validity of the results provided by THOR, by providing reasonable estimates of overall signal length and amplitude.
The results from THOR provide an indication of the capability provided by the research supported in the last few years.
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