When the number of devices in a layout is more than 15, this problem will turn to a NP complete problem, only by a heuristic algorithm can an approximate optimum solution be found.
当布局设备多于15台的时候，此类问题就变成了NP完全问题，只能利用启发式算法求出近似的最优解。
Eventually, the approximate analytic solution of the optimum damping parameter is obtained to provide a simple and effective reference and design method for the engineers.
最后给出了计算最优阻尼参数的近似解析式，为工程师提供了简便有效的参考依据及设计方法。
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