加速度有震荡？

小弟有如下问题
（1）面面自动接触的 （接触面和目标面都是刚体），建议修改哪些参数，推荐值？
（2）只给一个PART施加重力，该怎么时间 小弟看了K文件手册还是修改不来 我把重力安等值的力施加给了PART
（3）竖直方向只有重力 所以 地面摩擦力引起的加速度应该是一条直线 恒值 求得为高手指点
LOAD DEFINITIONS $
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
*DEFINE_CURVE
1 0 1.000 1.000 0.000 0.000
0.000000000000E+00 -3.057600000000E+05
2.000000000000E+00 -3.057600000000E+05
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$ CONTACT DEFINITIONS $
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
*CONTACT_AUTOMATIC_SURFACE_TO_SURFACE
1 3 3 3 0 0 0 0
0.1000 0.1000 0.000 0.000 0.000 0 0.000 0.1000E+08
1.000 1.000 0.000 0.000 1.000 1.000 1.000 1.000
*CONTACT_AUTOMATIC_SURFACE_TO_SURFACE
2 3 3 3 0 0 0 0
0.6000 0.6000 0.000 0.000 0.000 0 0.000 0.1000E+08
1.000 1.000 0.000 0.000 1.000 1.000 1.000 1.000
*LOAD_RIGID_BODY
3 3 1 1.000 0 0 0 0
$