基于故障树法的船舶舱室人因可靠性研究

人因可靠性的量化分析可为分析人-机系统的薄弱环节提供支持。本文通过将人的操作失误模式定义为底事件,建立人因操作失误树,并以此为基础,进行船舶舱室操作台的人因可靠性计算。仿真计算表明,故障树法分析人-机系统内人的可靠性具有较高的可靠性和实用性。     

水下管道维修干式舱系统可靠性及安全性分析

可靠性、安全性是水下管道维修干式舱系统的重要指标.在分析水下干式舱系统组成及作业特点的基础上,判定出最可能发生的两类典型故障,并以这两类典型故障为顶事件构建了恰当的故障树分析模型.开展了可靠性定性分析和定量计算,得出两类典型故障发生的概率及设备的关键重要度.根据定性分析与定量计算结果,找出了系统的薄弱环节,并对如何提高系统的安全可靠性提出了建议.     

Acoustic radiation analysis based on essential solution of Green’s function

The principle objective of the paper is to study the acoustic radiation problem of the 3D space domain with control boundary. By using the conformal transformation theory, the Green’s function for acoustic point source in the control domain space is obtained. With it, the expression of acoustic radiation function of the control domain is formed. Discussion about the acoustic radiation of pulsating sphere in right-angle space is drawn in the end, including the acoustic radiation directivity effect by the boundary characteristics, acoustic radiation frequency and acoustic source location. Numerical results show that: for the lower frequency radiation, the infection of free surface is significant; for the high frequency radiation, the infection of location is significant on the contrary. The research provides a new method for boundary characteristic problem of the structural-acoustic acoustic.     

基于相当故障树的舰船复杂系统可用性评估方法研究

本文在分析适用于舰船的两种可用性度量模型基础上,针对舰船系统复杂、子样小的特点,将故障树方法和经典法结合在一起,提出了基于相当故障树的大型复杂系统可用性评估方法,以解决舰船可用性评估问题。     

Numerical simulation to reliability analysis of fault-tolerant repairable system

In the traditional method for the reliability analysis of fault-tolerant system, the system structure is described by means of binary decision diagram (BDD) and Markov process, and then the reliability indexes are calculated. However, as the size of system augments, the size of state space will increase exponentially. Additionally, Markov approach requires that the failure and repair time of the components obey an exponential distribution. In this study, by combining dynamic fault tree (DFT) and numerical simulation based on the minimal sequence cut set (MSCS), a new method to evaluate reliability of fault-tolerant system with repairable components is proposed. The method presented does not depend on Markov model, so that it can effectively solve the problem of the state-space combination explosion. Moreover, it is suitable for systems whose failure and repair time obey an arbitrary distribution. Therefore, our method is more flexible than the traditional method. At last, an example is given to verify the method.     

Fuzzy-PID合成控制下铺缆船舶首向寻优动力定位

为使海上作业的铺缆船舶能够更好地保持定点作业能力,其上都安装有动力定位系统。船舶运动的数学模型是非线性的,单独使用模糊控制效果不够理想,通过使用Fuzzy-PID合成控制器可实现更精确的动力定位。该控制器包含大误差切换至Fuzzy控制模块、小误差切换至Fuzzy-I控制模块及微误差切换至Fuzzy-PID控制模块3个模块。同时为了船舶能够更好、更节能地抵抗外界环境,在控制器部分还加入了首向寻优环节。仿真验证表明,与传统Fuzzy控制对比后得出,使用Fuzzy-PID控制器仿真时系统的稳定性和响应速度都较为优越,提高了动力定位的效果,符合绿色动力定位的理念。     

小子样舰船可靠性评估方法研究

小子样舰船大型复杂系统的可靠性评估方法一直是个难题．根据任务剖面绘制系统故障树,找出系统最小割集．最小割集中的设备之间视为并联关系,最小割集之间视为串联关系,将故障树转化为只有二级的相当故障树,从而将系统可靠性评估模型简化．把采集处理的底事件数据（等效任务数、故障数、工作时间）代入计算模型中,得到了系统可靠性置信下限,并给出了不同分布类型（主要是二项分布）舰船设备数据转化为指数分布数据的方法．