VIBRATIONS OF A STIFFENED COMPOSITE SHELL

The natural frequencies and modes have been obtained for a stiffened and unstiffened composite shell composed of a cylinder with spherical end caps. Comparison of these are made to those obtained for an unreinforced cylindrical shell having various edge conditions. The results indicate that at the higher circumferential wave numbers, the frequencies of the unreinforced shell are independent of the end conditions. The frequencies of the ring-stiffened composite shell lie between the corresponding frequencies of the unstiffened shell and that of the isolated ring stiffener for circumferential wave numbers m greater than or equal to 1. Above a critical circumferential wave number, the stiffeners raise the value of the frequencies while below that number, they reduce their values. (Author)

• Corporate Authors:

  Polytechnic Institute of Brooklyn

  Department of Aerospace Engineering and Applied Mechanics
  Brooklyn, NY  United States  11201
• Authors:
  • Klosner, J M
  • Pollack, M L
  • Chen, Y N
• Publication Date: 1973-3

Media Info

• Pagination: 46 p.

Subject/Index Terms

• TRT Terms: Cylinders (Geometry); Cylindrical bodies; Equations of motion; Loads; Mechanical rings; Numerical analysis; Resonance frequency; Shells (Structural forms); Stresses; Vibration
• Uncontrolled Terms: Cylindrical shells
• Old TRIS Terms: Loading mechanics; Shell theory; Stiffened cylinders; Stiffening rings
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00047621
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: PIBAL-73-3 Res Rpt
• Contract Numbers: N00014-67-A-0438-000
• Files: TRIS
• Created Date: Oct 18 1973 12:00AM