In this study, the vibrations and resulting acoustic radiations from an elastic beam impacted by a steel ball have been studied theoretically and experimentally. First the transverse vibration of free-free elastic beams are analysed with modal analysis technique. The impact forces are modeled with the Hertz's theory and the estimated contact force, contanct duration are compared with the experimentally measured values. Also the calculated beam vibrations are verified with the experimental results. Then the acoustic radiations due to the beam vibration are studied numerically and experimentally. The acoustic pressure is calculated as assuming the beam has an elliptical cross-section. The predicted acoustic pressure is compared with the measured value. It was found that both the predicted beam vibrations using the Hertz's theory and the estimated acoustic pressure under the assumption of an elliptical cross-section are in very good agreements with the measured values.
