Abstract
This paper describes the statistical model of impact forces caused by coins falling to a storage box of a coin counter and the estimation of sound pressure radiated from the box. To represent the impulse of coin, the collision time and position of the impulse are defined as probability variables. Their probability density functions are assumed as Gaussian probability distribution. The measurement of vibration acceleration and radiated sound pressure in the initial excitation phase of coin is carried out. It is confirmed that the estimated frequency responses are coincided well with the measured values in low frequency domain.
