A time step&rsquo;s automatic adjustment method with load synchronous variation

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (11) : 5-11.

A time step’s automatic adjustment method with load synchronous variation

LI Bin1 TANG Xiao-wei1

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Abstract

To improve the numerical calculation efficiency, aiming at errors caused by time step in structural dynamic time history analysis, a relationship between time step and relative error was proposed to realize the time step automatic adjustment, satisfy target error limits, and enrich the time adaptive theory. The effectiveness of this method was validated through comparing the calculating result with the analytical solution to an example. It was shown that in local area, the faster the change of external load, the smaller the corresponding adaptive time step; the method can effectively solve problems of calculation being divergent or interrupted due to improper setting of time step in numerical dynamic computations under impact load, vibration load, explosion load or seismic load.

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time adaptive theory / time step / calculation efficiency / computation accuracy

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LI Bin1. TANG Xiao-wei1.. A time step’s automatic adjustment method with load synchronous variation[J]. Journal of Vibration and Shock, 2018, 37(11): 5-11

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