1986 Volume 52 Issue 483 Pages 2850-2856
The dynamic response of a plate and the impact noise are considered experimentally and analytically, when a steel sphere strikes a polymethyl methacrylate circular plate. The experimental results are compared with the calculated results, and the formative process of the sound pressure is studied by the calculation. At the initial stage of the impact noise measured on the central axis of the plate, the initial peak and the plateau are observed, and afterward the sound pressure attains the maximum value. The calculated results agreed with the characteristics of these results. By calculation it is found that the formation of the plateau at the initial stage is based on the response of the acceleration in the central area, r/a<le>0.6 of the plate, and the formation of the positive maximum sound pressure is based on the response of the acceleration in the lap area, r/a<le>0.7 of the plate. The wave form of the impact noise outside the central axis of the plate becomes simpler by decreasing the higher modes.
Transactions of the Society of Mechanical Engineers
Transactions of the Japan Society of Mechanical Engineers
Transactions of the Japan Society of Mechanical Engineers Series A
Transactions of the Japan Society of Mechanical Engineers Series B
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A
