面向海洋工程的故障树分析软件研究

发布时间：2019-01-28 10:40

【摘要】：海洋结构物是多系统多功能的大型产品,复杂系统的应用和恶劣的海洋环境会导致其在服役期间较多地发生故障和失效问题,并可能引发碰撞、火灾、爆炸、腐蚀破坏等灾害性事故,造成环境污染和人员伤亡等严重后果。海洋工程的可靠性问题一直是人们关注的焦点。故障树分析法主要应用于安全系统工程中,是国内外公认的对复杂系统进行可靠性评估的重要方法。本文基于对故障树分析法内容和原理的研究,结合海洋工程的特点,开发了面向海洋工程应用的故障树分析软件,主要研究内容如下:(1)针对海洋结构物系统复杂、故障树建造规模大的特点,研究并开发基于数值数组的大型故障树分析算法,该算法采用数值数组对故障树进行结构编码,通过数组之间的数值运算完成定性分析和定量分析,缓解NP困难问题,求解故障树的最小割集、不交化最小割集、最小路集、顶事件发生概率以及底事件重要度。(2)针对海洋结构物包含单元数目多、部件寿命分布多样、难以使用解析方法求解可靠性参数的特点,对基于故障树的可靠性数值仿真方法进行研究,使用威布尔分布拟合故障树底事件的失效分布函数,应用蒙特卡罗方法对底事件的寿命进行抽样,通过故障树结构函数求解顶事件发生概率,得到系统不可靠度随时间变化曲线。(3)针对海洋结构物可维修的特点,研究可维修系统的可靠性数值仿真方法,通过对元部件故障时间和维修时间的抽样,构建其状态变化时间数组,基于故障树的最小割集求解每次仿真系统的失效时间。(4)使用MATLAB编制程序对相应的故障树分析算法予以实现,使用GUI开发环境制作故障树分析软件界面。建立海上浮式风机的可靠性模型,使用故障树分析软件对浮式风机进行可靠性评估。
[Abstract]:Marine structures are large products with multi-system and multi-function. The application of complex systems and bad marine environment will lead to more failures and failures during service, and may lead to collisions, fires, explosions. Catastrophic accidents, such as corrosion damage, cause serious consequences such as environmental pollution and casualties. The reliability of ocean engineering has always been the focus of attention. Fault tree analysis, which is widely used in safety system engineering, is an important method to evaluate the reliability of complex systems at home and abroad. Based on the research of the content and principle of fault tree analysis and the characteristics of ocean engineering, a fault tree analysis software for ocean engineering is developed in this paper. The main research contents are as follows: (1) aiming at the complexity of ocean structure system, This paper studies and develops a large fault tree analysis algorithm based on numerical array, which uses numerical array to code the structure of fault tree, and completes qualitative analysis and quantitative analysis by numerical operation between arrays. In order to solve the problem of NP, the minimum cut set, disjoint minimum cut set, minimal cut set, minimum path set, the probability of top event occurrence and the importance of bottom event are solved. (2) in view of the large number of units contained in marine structures, the life distribution of components is diverse. It is difficult to use analytic method to solve the characteristic of reliability parameter. The reliability numerical simulation method based on fault tree is studied, and the failure distribution function of fault tree bottom event is fitted by Weibull distribution. Monte Carlo method is used to sample the life of bottom event, and the probability of top event is solved by fault tree structure function, and the curve of system unreliability with time is obtained. (3) aiming at the maintainability of ocean structure, The reliability numerical simulation method of maintainable system is studied. By sampling component failure time and maintenance time, an array of state change time is constructed. The minimum cut set based on the fault tree is used to solve the failure time of each simulation system. (4) the corresponding fault tree analysis algorithm is implemented by using MATLAB programming program and the fault tree analysis software interface is made by using the GUI development environment. The reliability model of floating fan is established, and the reliability of floating fan is evaluated by fault tree analysis software.
【学位授予单位】：哈尔滨工程大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P75

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