Abstract
This paper describes the identification and statistical evaluation of impact forces caused by coins falling to a storage box of a coin counter. Because of the difficulty of accurate calculation for the excitation points and magnitude of the impact forces, the virtual excitation points are assumed. The experiments about the different number and kind of coins are carried out and then the virtual forces are estimated in each experimental condition. It is confirmed that the characteristics of frequency spectra of the virtual forces depends on the number and kind of coins and has reproducibility. Next, the input power which has Gaussian probability distribution is assumed as the stochastic impact force's model. The estimated frequency responses of acceleration of the storage box coincided well with the measured values.
