Make perturbation, in terms of these errors, to revise wave impedance mod-el until the errors reduce to minimum.
根据此误差，再作摄动，修改波阻抗模型，直到误差趋于最小为止。
2
The paper presents a coordinate perturbation method to deal with the pro -. Blem of a plane blast wave propagation in nonlinear hysteretic media.
本文利用座标摄动方法研究平面爆炸波在非线性磁滞介质中的传播问题。
3
In the end, we prove the validity of the singular perturbation expansions and get some useful deductions about the existence of the classical solution to the flood wave equations.