The results show:(1)changed-pool is the main cause of energytransformation;(2)hydraulic-jump shape is relevent to Z(pre-pool depth) and H(pool-ridgehigh);(3)whirlpool scope,shape and strengenth are relevent to Z,H and L(pool length);(4)intersect-ing face change show a d.

Effect of baffle block on hydraulic jump length is considered by changing baffle block position .

Numerical simulation of hydraulic jumps on corrugated beds;

Direct calculation formulas of the hydraulic jump conjugate depth of trapezoidal channels;

In this paper, the semi-active control for MR dampers was studied, and the state-jump control algorithm was presented.

The concept of safe angle scope is used to define the relationship between initial landing attitude angle and lunar slope,and a state-jump algorithm is developed to realize semi-active control during soft landing.

Based on linear quadratic optimal(LQ) control theory,the optimal control force was solved and a state-jump algorithm was adopted to realize semi-active control during the process of soft landing.