The Structural Engineer > Archive > Volume 63 (1985) > Issues > Issue 14 > A Comparison of Analysis Techniques For Offshore Platform Cranes
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A Comparison of Analysis Techniques For Offshore Platform Cranes

This paper compares the efficiency of mode superposition and direct integration methods for the dynamic analysis of offshore platform cranes. Newmark’s method and the central difference method, which integrate the equatiom of motion directly, are compared with the method of mode superposition on the basis of computer time, computer storage, and program complexity. Progruming techniques to improve the efficiency of the different algorithms are described. Results are presented that show the central difference method to be uneconomic in comparison with the other two methods. The method of mode superposition, while requiring marginally more computer storage, is shown to offer substantial savings in computer time over Newmark’s method. J.A.D. Balfour