When stress wave is used to inverse joints attitude, the key problem is judge the initial arriving moment of reflected P-wave from the tested vibration signal.
节理产状应力波反演时，关键问题在根据测试振动信号判断出节理面反射纵波初至时刻。
2
The design of a gradient singularity avoidance pseudo-inverse control law used for double gimbal control moment gyro (DGCMG), its principle and calculation were introduced.