According to the motion differential equations of longitudinal vibration of ship propulsion shafting, the transfer matrix of the rigid homogeneous disk, thrust bearing and shaft segment were derived , and the method for solving the natural frequencies and mode shapes are presented. For further analyzing the longitudinal vibration amplitudes and alternating axial forces of each shaft segments, the transfer matrix of rigid homogeneous disk, thrust bearings and shaft segment element were extended. Using the presented method calculate the natural frequencies, mode shapes and the forced vibration response of ship propulsion shafting. Finally the influence of the added mass of propeller and the thrust bearing stiffness on the longitudinal vibration calculation results was analyzed. The results show that the increased bearing stiffness and reduced added mass will increase the natural frequency of longitudinal vibration , and the effect of longitudinal stiffness for the thrust bearing is more significant.%舰用设备抗冲击性能是其技术性能的重要要素之一,正确分析舰用设备抗冲击能力也是开展系统级别抗冲击性能设计、管理、优化的前提.明确了舰用设备抗冲击能力的定义,给出了采用时域模拟法确定舰用设备抗冲击能力定量计算方法.选取某刚性安装的舰用增压锅炉为研究对象,对影响设备抗冲击能力的因素和抗冲击能力值进行了分析.旨在为今后舰船设备抗冲击性能分析提供方法和手段.
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