The natural frequency of the gas column in simple pipelines was solved using the finite element analysis method. The result agreed with that derived with transportationmatrix method.
采用有限元分析方法，对简单管道气柱的固有频率进行求解，其结果与用传递矩阵法求得的结果是一致的。
2
The OD matrix then has reflected in the specific time interval along with the time variation transportation demand pattern.
OD矩阵则反映了特定的时段内随时间变化的交通需求模式。
3
Traffic assignment is that the od matrix is loaded onto the transportation network under some assignment models.