衝撃の形と振動について

概要

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The response spectra for some simple forms of impulse, that is, rectangular, triangular and sinusoidal types, on a vibratory system of one degree of freedom are studied. It is well known that the response spectum for the simple harmonic force is extremely steep at the resonance frequency, but response spectra for impulse have not yet been made clear, except, for example, them for symmetrical triangle and one-half-cycle sine pulses. Therefore, the response spectra for various other types of pulses, that is, triangle, sin^2 ωt and sin^3 ωt are studied and compared with them. The response spectra for impulse are different from the spectrum for simple harmonic force, and also different from each other, even if the impact during the forcing era is equal. They approach to 1 during the forcing era and to 0 during the residual-vibration era according to increase of the frequency of the vibratory system, except them for rectangle and triangle of ε=0, shown by Figs. 7, 8 for the forcing era and by Figs. 10, 11 for the residual-vibration era. The reasons causing the difference of the spectra during the both era for the forms of impulse are physically interpreted. In addition, the effects of the damping force on the response spectra are studied as shown by Figs. 13, 14 and 15.
社団法人日本船舶海洋工学会の論文
1959-03-25