The structure simplification of the open boxcar, choosing elements type, and disposing the boundary and restriction of the model are introduced.
基于有限元分析方法，对运煤敞车的结构简化、单元选取、边界及约束处理等建模技术进行阐述。
Type choosing process of power system stabilizer in Three Gorges left bank power plant was introduced, the structure and principle of PSS2A was mainly described.
介绍了三峡左岸电站电力系统稳定器（PSS）的选型过程，主要介绍了PSS2A模型的构成和工作原理。
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