You need give the displacement control instead of initial velocity. 为什么分别加正负初始速度, 刚体运动方向相同呢?
Displacement, Initial velocity, Final velocity, Acceleration and Time. 位移，初速度，末速度，加速度和时间。
INFLUENCE OF STATISTICAL INITIAL DAMAGE ON SURFACE DISPLACEMENT IN JOINTED ROCKS 岩体采动沉陷的损伤效应
Higher initial normal stresses offer higher shear stress with the same horizontal displacement. 初始法向应力越大，相同剪切位移对应剪应力越大。
Initial displacement and timing and accuracy of reduction are the key factors affecting outcome. 最初骨折移位和复位时间是影响愈后的关键因素。
Forced vibration tests of the model dam, excited by the initial displacement, measurement have been carried out for several cases. 针对平面模型，用初位移激震分几种工况进行实验。