A sufficient conditionofstability in analytical form for arbitrary number of modes is obtained.
导出适用于任意阶模态的解析形式稳定性充分条件。
2
Highly precise solutions both in time and in space can be reached by solving wave equation with high order finite difference scheme of staggered grid under the conditionofstability.
用交错网格的高阶有限差分方法解波动方程，在满足稳定性要求时，可获得时间和空间都是高阶精度的结果。
3
The paper analyses the implementary arithmetic in the servo system with saturation and lag segment, and analyses the performance of the close loop to obtain the conditionofstability and robustness.