Accession Number:

ADA021248

Title:

Optimum Design of Submerged Cylindrical Shells Subjected to Dynamic Loadings,

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV LOS ANGELES DEPT OF MECHANICS AND STRUCTURES

Personal Author(s):

• Nelson,R. B.
• Felton,L. P.
• Schmit,L. A. , Jr

Report Date:

1975-11-01

Pagination or Media Count:

41.0

Abstract:

This report presents a procedure for the optimum design of a submerged T-ring stiffened cylindrical shell subjected to a specified harmonic excitation and external pressure. Three different design objectives can be investigated 1 minimum structural mass, 2 minimum structural response and 3 minimum of a linear combination of structural mass and structural response. The design variables are shell thickness, T-web depth and thickness, T-flange width and thickness, and uniform stiffener spacing. The design constraints are on geometric admissibility, in vacuo natural frequencies of the shell, shell buckling, and on internal stresses. Numerical studies indicate the necessity of constraining the structural mass of the cylinder if minimum structural response is the design objective, and constraints must be imposed on both structural response and maximum structural mass when the combined design objective is employed.

Descriptors:

• *SHELLS(STRUCTURAL FORMS)
• *UNDERWATER STRUCTURES
• VIBRATION
• RESONANT FREQUENCY
• STRUCTURAL RESPONSE
• STIFFENED CYLINDERS
• BUCKLING
• DYNAMIC LOADS

Subject Categories:

• Structural Engineering and Building Technology
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE