What is the effect of a double-hit excitation on the frequency spectrum?

The effect of the double-hit excitation can be calculated from the time interval between the two impacts.

The following chart shows how the inverse of the time interval affects the interference in the frequency band.

Fig. 1: Time domain of the force sensor of the impact hammer WaveHitMAX with double impact
Fig. 1: Time domain of the force sensor of the impact hammer WaveHitMAX with double impact
Fig. 2: Frequency domain of the force sensor of the impact hammer WaveHitMAX in with double impact
Fig. 2: Frequency domain of the force sensor of the impact hammer WaveHitMAX in with double impact
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