The under-balanced drilling technology is based on how to control the bottom negative pressure which is related to the pressure computation of multiphase flow in annulus .
井底负压值控制是欠平衡钻井技术的基础，而井底负压值的大小与环空多相流的有关压力计算有关。
The development of perimeter control of the checkerboard involved in structure topology optimization of multiphase materials is presented.
针对多相材料结构的拓扑优化出现的棋盘格问题，研究了周长约束控制方法。
In this paper, intelligent control methods applied in multiphase speed control system are deep investigated.
论文对多相永磁同步电机调速系统采用智能控制的方法进行了深入的研究。
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