shaft frame meaning in English

井框

First , according to the orthonormal quality and the rational choice of working point of the sonar array three shafts frame , the structure of the models is predigested preliminarily ; secondly , according to the quality indexes and the coupling quality between frames , relatively small quantum is neglected . so the complex non - linear coupling models of the sonar array are predigested farther ; lastly , considering the characteristic of the model coefficient matrix , the methods of the low rank polynomial approach and the error simulation are introduced . so the models are predigested again
首先从声纳基阵框架结构的正交性和工作点的合理选择出发，使模型的结构得以简化；其次根据系统性能指标及框架间耦合性强弱，忽略相对小量，对声纳基阵复杂的非线性耦合模型进一步简化；最后考虑模型系数矩阵的特点，运用低阶多项式逼近和误差仿真的方法，实现了对模型的再次降阶简化处理。