Abstract The spectral distribution of the acceleration noise, as defined in Part I of this series, is obtained using both the pressure waveform expressions and the spatial averaged velocity on the surface of the body, together with a radiation efficiency associated with the rigid body movement of the object. This distribution with frequency is shown to be mainly dependent on the size of the body and the duration of the transient and is independent of the body shape detail and the exact shape of the transient. The spectral distribution of acceleration noise is important in the case of impact of structures whose first ringing natural frequency is within the frequency range under investigation. Under such circumstances, it is important to estimate the response of the structure below this resonant frequency. In this paper this is investigated to show that the response, and hence the noise radiated from a structure below the first ringing frequency, is low and the noise in this frequency range is mostly due to acceleration noise. These results are verified in the case of bottle clashes.
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