更换弹种 meaning in Chinese

changing

Referring materials of research on feed system , this thesis proposed a feed method , which used multi - drum to feed in the transfer rooms , serially raise the ammunition in central elevator hoist and multi - direction in turret . this thesis discussed the whole arrangement of the large - medium caliber gun ' s feed system , technique of multi - direction feed in the transfer rooms , serial raising technique , and double direction feed technique in turret and relative technique of ammunition type changing and interface
本文从系统功能的角度研究了大中口径舰炮扬供弹系统的总体布局、转运间的多向供弹技术、单线扬弹技术、炮位的双向供弹技术及相关的更换弹种和接口技术，并利用先进的设计软件对敏捷供弹系统的运动情况进行了三维虚拟样机建模、仿真研究。