Acoustic radiation from a viscoelastic disk impacted by a steel sphere

✍ Scribed by M. Sakata; K. Kimura; Y. Mochida

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 557 KB
• Volume: 109
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1016/s0022-460x(86)80025-6

✦ Synopsis

An experimental and theoretical analysis of the acoustic field radiated from a viscoelastic disk when impacted by a steel sphere is presented. Transverse vibrations ofa PMMA disk have been analyzed by employing the modal analysis technique and an approximate method, with the Hertz theory used to evaluate impact force. In solving the wave equation, spheroidal co-ordinates were employed with the disk modeled by an oblate spheroid and a FFT procedure used to determine the time transient in the acoustic radiation. It is shown that the theoretical prediction for the wave forms of the disk acceleration and the acoustic radiation from the disk is in fairly good agreement with the experimental results.