典型管路系统抗冲击性能.doc

摘 要
舰艇管路系统的抗冲击安全性能是其生命力要素的重要组成部分，因此对舰艇管路的抗冲击仿真评估分析方法的需求也十分迫切。本文基于时域分析法，采用元器件局部模型与整体模型的嵌套技术，基于有限元分析方法提出典型管路系统抗冲击性能仿真方法，并通过模型试验对此方法的仿真精度进行验证，在此基础上对典型管路系统管路段的抗冲击性能进行了分析，分析了管路设计与安装因素对抗冲击性能的影响，并给出具体建议。本文主要研究工作如下：
（1）建立了典型管路元器件局部细化有限元模拟方法，发展了管路系统的整体有限元建模技术。在典型管路元器件局部有限元建模技术的基础上，采用有限元软件，根据管路布设特点设置边界，采用局部结构细化，整体模型网格合理划分的有限元整体建模技术，对典型管路系统进行建模，通过有限元计算分析，获得典型管路系统的整体动力特性，计算效率较高。
（2）基于时域分析法和有限元分析技术建立了仿真精度较高的典型管路系统抗冲击性能仿真方法，并通过模型试验对该方法的仿真精度进行验证。在管路系统抗冲击性能时域分析方法基础上，采用边界条件等效、关键部位细化、弱连接部位接触的处理方法，建立了仿真精度较高的管路系统抗冲击性能仿真方法。根据实验条件，较全面的考虑了管路元器件、管路弯头、管路支吊架的设置等元器件连接方式对抗冲击性能的影响，设计了典型空间管路试验模型并在冲击试验台上进行了冲击试验，将试验数据与数值模拟计算结果进行对比分析，验证了数值模拟方法的计算精度。
（3）针对典型管路系统管路段，建立其有限元分析模型，分别对该管路系统的横向、纵向、垂向抗冲击性能进行分析，给出抗冲击薄弱环节，并提出了改进建议。
（4）通过数值分析，给出了管路系统抗冲击性能的主要影响因素及提高管路系统抗冲击性能的建议。针对管路系统的不同减振方式、布设、支撑方式，位置、管路穿舱方式、连接方法对管路抗冲击性能的影响，进行了垂向、横向、纵向抗冲击性能的数值仿真计算，给出了管路系统抗冲击性能的主要影响因素，并对提高管路系统的抗冲击性能提出一些建议。

关键词 管路系统；抗冲击；时域分析法；船舶



Abstract
The shock resistance performance of shipboard pipeline system is very important to survivability of ship, so it is an exigent demand for simulation and eva luation method for shock resistant of typical pipeline system. Based on the time domain analysis method, a simulation method for shock resistant of typical pipeline system is introduced by nesting technique of local model and integrated model and FE method. Simulation precision of FE method is also verified from model test. On that basis, shock resistances of typical pipe segments of the pipeline systems are eva luated. The effects of pipeline design and installation factors on pipe shock resistance performance are studied. And some specific advice is given. The main contents of this paper are listed as follows:
(1) The paper established FE method of partial thinning mesh for typical components of pipeline. The integral finite element modeling technology is developed. On the basis of FE method of partial thinning mesh for typical components of pipeline, according to FE modeling technology with reasonable grid, the model of pipeline which boundary is set up by the characteristics of pipeline’s layout is established by the finite element software ANSYS. Integral dynamic characteristic of typical pipeline system is obtained with higher calculating efficiency through FE method.
(2) On the basis of the time domain analysis method and FE method analysis technology, simulation method with high efficiency for shock resistance of typical pipeline system is established and simulation accuracy of the method is also verified from model test. Based on the time domain analysis method for shock resistance of pipeline system, simulation method with high efficiency for shock resistance of typical pipeline system is developed by the treatments such as the equivalent boundary conditions, key parts of refinement, and weak joints of contact element. Typical spatial pipeline test model is designed and carried out in shock platform. The calculation precision of simulation method is verified by the comparative analysis between test data and the numerical simulation result.
(3) Finite element analysis models of the pipeline segments are established. The three pipe’s shock resistance performance which contains transverse, longitudinal and vertical are eva luated. Weak link and improvement suggestions of shock resistance is given.
(4) The main influential factors and the suggestions of improving shock resistance of pipeline system are given by numerical analysis. Taking the factors that affect shock resistance performance of pipeline system such as different way of piping system vibration, layout, support pattern, location, pipeline penetrating way, connecting method, numerical models into account, the pipes’ shock resistances performance which contains transverse, longitudinal and vertical are calculated. Then the main influential factors and the suggestions for improving shock resistance of pipeline system are given.

Keywords Pipeline system; Shock resistance; time-domain analysis; ships

目录
摘 要 I
Abstract II
第1章 绪 论 1
1.1 研究背景及研究意义 1
1.2 管路系统抗冲..