The muzzle of a gun mounted on an airplane emits repetitive gun blast waves during the
firing. These blast waves expand in open space and they are reflected on the airplane surface
adjacent to the gun. The vibration resulting from the reflected waves can cause adverse
effects to the airplane. Therefore, it is very important to establish an accurate blast wave
model for the prediction of the vibration level. In the present study, the blast wave model is
established using a scaling approach and CFD calculation, and this model is then verified
with experimental data. The established blast wave model is applied to two kinds of
structural models. Firstly, to investigate the effect of the muzzle distance from the surface,
the responses of a graphite epoxy composite panel exposed to the blast wave are analyzed for
various muzzle distances. Secondly, the transient response analyses of a left wing model are
carried out for several repeated fires. From the results, it can be shown that the assumption
of uniform blast wave is not applicable in the near muzzle distance, and the vibration
resulting from the repetitive blast waves can cause high frequency damage to the structure
and equipments mounted in the aircraft. The blast wave model can be applicable not only to
the prediction of the vibration but also to a blast resistant structural design.