Near field sound radiation from simply supported rectangular plates

✍ Scribed by T. Takahagi; M. Nakai; Y. Tamai

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 610 KB
• Volume: 185
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1995.0392

✦ Synopsis

The sound radiation efficiency of a harmonically point-forced and simply supported rectangular plate is obtained numerically and is compared with that of a circular plate. The effect of aspect ratio and thickness on sound radiation efficiency is also studied. Since the radiation of sound from the plate is analyzed in the near field, its characteristics near the critical frequency are revealed. In numerical analysis, the technique of co-ordinate transformation which enables a quadruple integral of sound power to be shown in single integral representations, is employed. The radiation efficiency is at a maximum when the frequency of the applied force is slightly higher than the critical frequency. When the aspect ratio of a rectangular plate is nearly equal to unity, or its shape is similar to a square, the radiation efficiency depends only on the frequency of the applied force. But when the aspect ratio differs from unity, the influence of the mode number on the radiation efficiency cannot be ignored in the frequencies below the critical frequency.