针对雷电间接效应圆柱腔体耦合场表征中透射方法在非规则圆柱腔体情况下误差较大的问题，在规则圆柱腔体透射场原理分析的基础上，对Richard 时域转移阻抗模型进行调整，提出基于腔体表面曲率半径的时域转移阻抗模型。该模型考虑了腔体半径变化的影响，能同时有效表征规则圆柱腔体和非规则圆柱腔体的时域转移阻抗。在验证试验中成功地将非规则圆柱腔体透射场与内部场的误差从10.83%缩小到4.9%，解决了透射法在非规则圆柱腔体雷电场耦合中的适用性问题。本文工作为雷电脉冲透射非规则圆柱腔体耦合分析提供一个适用范围更广的方法。

For the big error of characterizing the field coupling into cylindrical cavity of lightning indirect effects by using transmission method under the condition of irregular cylindrical cavity, the Richard time domain model of transfer impedance is improved. A new time domain model of transfer impedance basing on curvature radius of cavity surface is presented based on the analysis of the principle of regular cylindrical cavity’s transmission field. This model considering the influence of the radius’s change of cylindrical cavity can characterize the time domain transfer impedance of both the regular and irregular cylindrical cavities. The error between the transmission field and internal field of irregular cylindrical cavity decreases from 10.83% to 4.9% in the confirmatory experiment, and the suitability problem of transmission method used in the lightning field coupling into irregular cylindrical cavity is solved. This work provides a more widely applicable method for coupling of lightning impulse into an irregular cylindrical cavity.