The stability of the systems is an important factor in the theory of dynamic systems, it make the controlled object meet the design index exactly.
系统的稳定性分析是动力系统理论中的一个重要问题，是受控对象能精确地满足设计指标的前提条件。
2
The dynamic derivatives conception is used as the index for the vehicle stability, but it is looked as the function of angle of attack and Mach number to induced nonlinear characteristics.