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中文摘要：
针对舰载活动设备产生的电磁干扰不易消除而需准确评估问题,以舰载吊车为例,采用时域有限差分法分析了舰载吊车在收起和工作状态下的电磁场特性变化.为提高建模精度,引入平均电参数对金属设备进行建模.通过坐标变换,提出了修正的差分方程对金属设备与Yee网格不重合的边缘部分进行模型修正.通过算例对比验证了算法的有效性.仿真结果表明,舰载吊车在收起和工作状态下电场有20～30 V/m的变化,磁场有0.18～0.8 A/m的变化,这类电磁场变化对舰船电磁兼容性的影响不容忽视.
英文摘要：
The electromagnetic interference of shipborne mobile equipment must be evaluated correctly,because it cannot be degaussed by traditional methods.In this research,a shipborne crane was taken as an example,and the finite-difference time-domain（FDTD） method was applied to analyze the changes of the electromagnetic fields of the crane in the states of stow and operation.The average electrical parameters were adopted to improve the model accuracy of metal equipment.By changing the coordinates,modified difference equations were proposed to modify the metal edges that could not match the Yee grids.The algorithms were proved effectively by example comparisons.Finally,results indicate that the changes in the electric fields are 20~30V/m,and the changes in the magnetic fields are 0.18~0.8 A/m in the state of stow and operation of the crane.The influence of these kinds of electromagnetic changes on the electromagnetic compatibility of ships cannot be ignored.
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