船舶浮筏隔振系统冲击响应的时域计算

Thc Computation of Shock Response of Marine Floating Raft Shock-resistant System in the Time Domain

舰艇特别是潜艇在战斗条件下的主要威胁来自水中非接触性爆炸,选用抗冲击性能好的设备和对设备采取冲击防护措施可以保证艇上设备的安全性,即这些措施可以限制冲击作用时设备与基座之间的最大相对位移以及设备的最大加速度,使用隔振装置就是一种较好的冲击防护措施。因此在隔振装置的设计阶段必须对其抗冲击性能进行校核,从而保证隔振装置的抗冲击性能。各种有限元分析软件例如MSC.NASTRAN软件可以应用于隔振装置的抗冲击性能校核。应用MSC.NASTRAN软件及其前后处理模块MSC.PATRAN对旅游船上柴油发电机组浮筏隔振装置进行有限元建模和分析,首先对筏体和浮筏隔振系统模型进行理论模态分析和计算,且计算结果和试验结果吻合较好;接着对浮筏隔振系统模型进行瞬态响应分析,从而考核该装置的抗冲击能力。以旅游船浮筏隔振装置为分析对象的目的在于探讨舰艇浮筏隔振装置抗冲击性能校核的时域计算方法,分析计算方法可用于舰艇隔振抗冲装置抗冲击性能的分析计算。

Chooing the equipment with good shock-resistant performance and taking shock protection measures while designing the onboard settings, the safety of onboard settings can be assured when warships, especially submarine subjected to non-conact underwater explosion, that is, these means can be used to limit the rattlespace (i.e., the maximum displacement of the equipment relative to the base) and the peak acceleration experiencedby the equipment. Using shock-resistant equipments is one of shock protecion means. The shock-resistan performance of the shock-resistant equipments should be verified in the design Phase of the equipments. The FEA (Finite Element Analysis) software, for example, MSC.NASTRAN^(D○R), can be used to verify the shock-resistant performance. MSC.PATRAN^(D○R) and MSC.NASTRAN are used for modeling and analyzing the floating raft vibration isolating equipment in this paper. The model of the floating raft and the floating raft vibration isolating system are theoretically analyzed and calculated, and the analysis results are in agreement with the test results. The transient response analysis of the system medel follows the modal analysis of the floating raft vibration isolating system. And it is used to verift the shock-resistant performance. The analysis and calculation method used in this paper can be used to analyze the shock-resistant performance of onboard shock-resistant equipments.