When using the method, state transfer matrix is applied to produce the constraints, which can reduce the error from numerical method.
在应用这种方法时，利用状态转移矩阵来产生无推力段的约束，减少了数值方法的误差。
Matrix step is low by using the finite element transfer matrix method. Natural frequency by calculation approaches to actual natural frequency and the error is allowable.
用有限元传递矩阵法分析火炮身管固有振动特性，矩阵阶次低，计算所得的固有频率与实际固有频率接近，误差在允许的范围内。
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