| 摘要 |
PROBLEM TO BE SOLVED: To stably calculate the periodical movement of the linear dynamic system of an animation at the time of generating the animation by calculating the movement of an object through the use of a computer. SOLUTION: One-period response calculating processing 11 calculates a response at the time of adding external force f (t) by the portion of one period by Euler method, etc., like a discrete numerical value. A response continuing period calculating processing 12 obtains an integer (m) to be |xr (t|<θ for t>mT with respect to a threshold value θ and a shifting sum calculating processing 13 obtains the shifting sum ΣXr (t+mT) of the response Xr (t) concerning 0<t<T. As the result, the applying section of Euler method can be limited to reduce the propagation of a numerical calculation error due to discretization, etc., to stably obtain a periodical solution. |
