The major work is as follows : 1 ) based on dry hull modal analysis of flexure - torsion coupling vibration of unsymmetrical ship structures about longitudinal centerline , a transfer matrix method to calculate the dynamic characteristics is adopted after the parameters of structures are specified . taken both shear effect and warping deformations into account , the point and field transfer matrices are derived , and the influence on dynamic characteristics is computed according to different damaged positions and areas 其主要内容如下： 1 )通过薄壁梁理论求得结构参数后，采用迁移矩阵法，在考虑剪切效应、转动惯量和翘曲影响下，推导出求解破损船体结构的动态特性公式系统的场迁移矩阵和点迁移矩阵，并着重分析了船体不同破损程度和翘曲变形对船体振动的动态特性的影响。
The condensing length increases with the boiler heating power and air content increasing , , while it decreases with the system pressure increasing . under the normal pressure , the wall temperature and the centerline temperature along the condensing length nearly remain constant for pure steam , while they decrease continuously for steam / air mixture . however , when the steam condenses over , the temperatures drops rapidly 常压下，纯净蒸汽冷凝时，有效冷凝段管壁壁温基本保持不变，但是当蒸汽冷凝完毕进入过冷水阶段后，管壁壁温会急剧下降；蒸汽中含有空气时，冷凝管中心温度变化不大，但管壁壁温始终呈下降趋势。
