relative vector

Hilbert' 16th problem is to determine the minimum upper bound for the number of limit cycles of plane vector fields, and their relative location.

D.Hilbert在1900年展望20世纪数学的未来时，提出的著名的23个数学问题的第16个问题，就是寻求平面向量场极限环个数的最小上界，以及这些极限环可能出现的相对位置。

Then these modes are detected by test datas, the results shows that those three models built by Support Vector Machine are more accurate and have littler relative error.

用检测数据分别对三种模型进行检验，结果显示支持向量机建立的三种模型相对误差较小。

Therefore generator terminal voltage vector is selected as quasi-synchronous reference axis relative to rotor, and the generator model in two reference frames is established.

故选择机端电压矢量作为转子准同步参考轴，建立了基于单机二系坐标的发电机模型。