CRITICAL AND COINCIDENCE FREQUENCIES OF FLAT PANELS

✍ Scribed by K. Renji; P.S. Nair; S. Narayanan

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 303 KB
• Volume: 205
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1997.0992

✦ Synopsis

Critical and coincidence frequencies of panels are important in studying their behaviour under acoustic excitation. Most spacecraft structural panels are of honeycomb sandwich construction and many of them have face sheets made of composite material. The critical and coincidence frequencies of such panels are discussed here. Expressions for critical and coincidence frequencies of thick isotropic and thin as well as thick symmetric composite panels are derived. It is shown that the orthotropic behaviour and transverse shear flexibility of the panels affects the critical and coincidence frequencies. The critical frequency of a typical composite honeycomb sandwich panel obtained using the above expressions match well with experimental results.