For locating the critical failure surface, the particle swarm or the harmony method is used, which is an upper bound approach.
而搜索临界滑裂面的过程，采用粒子群法或和声法搜索最危险滑动面。
The paper forword a mathematical model of stream function for sinkings with no internal mandrel and applies the upper bound approach principle to make further deduction and calculation.
对无芯棒缩管提出了流函数的数学模型，应用上限原理加以推导和数值运算。
The approach does not require apriori knowledge of the sign of the control gain and the upper bound and lower bound of dead zone model parameter to be known apriori.
该方法不要求的先验知识的控制增益的符号和的上界和下界的先验已知的死区模型参数。
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