点拘束のある片持正方形板の振動 : 点支持と点固定の比較

概要

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This paper deals with the result of comparison between the natural vibration (frequency and mode) of the cantilever square plates restrained at several supported points and that restrained at several fixed points. A good coincidence between numerically analyzed values calculated by means of FEM (Finite Element Method) using "NASTRAN" program and experimentally measured values is found for both restraints of supported points and of fixed points. Maximun values of natural frequencies appear for the plates that restrained points are located at 75∿85% (α=0.75∿0.85) from cantilever fixed ends toward free ones. And in both cases of one fixed point and of one point supported at the centers of figures of the plates, the degeneracy is clearly found. Also in both cases of two fixed points and of two supported points, which are disposed symmetrically, some degeneracies are found at several places.