变换，转换 meaning in Chinese

convert v. change from one form or state to another

The paper gives the expressions of the moving load in the time - space field . the paper gives stiffness matrix and mass matrix in finite element analysis of the ground vibration problem caused by track traffic by using three - dimension finite element method . because three - dimension finite element analysis is very difficult , it is transmitted into a quadratic programming , which can be calculated by neural network
为了利用神经网络进行有限元计算，本文给出了列车运行时移动荷载在时间域和空间域的分布表示，通过三维有限元方法的分析，详细推导出了轨道交通荷载引起地面振动的有限元计算中的刚度矩阵和质量矩阵，同时将动力有限元的计算问题通过矩阵变换，转换成了一个二次型的优化问题。