请教base motion的用法
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base motion按照如下方法用，是否表示对同一个基础进行三向加速度同时加载？如果不对，基于MODAL DYNAMIC下，运用什么关键字可以实现对同一基础进行三向不同加速度载荷加载？谢谢
*MODAL DYNAMIC, CONTINUE = NO
0.01 ,3.0
*Modal Damping
1, 15, 0.02
*base motion, dof=1, amplitude=wave, scale=9800
*base motion, dof=2, amplitude=wave1, scale=9800
*base motion, dof=3, amplitude=wave2, scale=9800
*MODAL DYNAMIC, CONTINUE = NO
0.01 ,3.0
*Modal Damping
1, 15, 0.02
*base motion, dof=1, amplitude=wave, scale=9800
*base motion, dof=2, amplitude=wave1, scale=9800
*base motion, dof=3, amplitude=wave2, scale=9800
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