How to express feature modeling and decide geometric drawing parametry is key technology of parts parametric feature modeling design. 如何实现特征模型的表达和几何图形参数的确定是零件参数化特征造型设计的关键技术。
Parametric rolling is a kind of the resonance phenomena of ship motions, caused by the periodical fluctuations of stability parameters of ships in waves. 参数横摇是指船舶在波浪中由于自身系统中稳性参数的周期性变化所引起的船体梁横摇共振运动现象。