二维刚体弹簧元
2D rigid body spring model
超音波法液位元元元元元元测定
ultra-sonic method of liquid meaduremert
弹簧刚度系数
rigidity coefficient of spring
地基弹簧刚度
sub-grade spring stiffness
复杂平面刚体体系
complicated planer rigid-body system
刚体弹道模型
rigid body trajectory model
Trajectory model
简化刚体弹道方程
equations of motion for a simplified rigid trajectory
液压弹簧刚度
hydraulic spring stiffness
有限刚体元方法
rigid finite element method