The working principle of boiler tube expander is elaborated and the formula for calculating the related parameters is derived in this paper according to the theory ofmechanicsofrigidbody.
本文运用刚体力学理论阐明了胀管器的工作机理，并导出相关参量的计算公式。
2
Calculation of the floating raft isolation level brings differences in use ofrigidbody models in research of dynamics mechanics research in the floating raft isolation system.
在船舶浮筏隔振系统的动力学特性研究中，采用刚体分析模型计算浮筏隔振效果会产生很大误差。
3
Kinetic energy ofrigidbody which is indicated by means of speed of end point is studied and its application in mechanics is given.