失效分析

The basic concepts, theory and methods of risk analysis are introduced. In viewof present achievement and failure analysis report home and abroad, the failure tree ofvertical caisson breakwater is established.

介绍了风险分析的基本概念、原理与方法，综合国内外的研究成果和故障分析报告，建立了直立式防波堤失效风险的故障树。

The initial value of the convergence half angle in the iterative synthesis is discussed and a more logical function is given for assigning it.

对轴对称收敛型电子枪设计方法进行了整理分析，就阴极半锥角的初始值对迭代综合法的收敛性能所产生的影响进行了讨论，针对低压缩比条件下原来的Vaughan公式失效的问题进行了分析，给出了更为合理的初始值计算公式。

By analyzing the interdependence between the operating stress f0und in RET and the stress in actual operation environment,the formu／a for reliable probability was deduced based on interference mode1.Then an example was given to explain this approach's feasibility.RET could improve the reliability of products by improving the quality of design and manufacturing process.By using the interference model and the deuced formula,two ways of improving the reliability of products were analyzed.

应力强度干涉模型根据产品的应力和强度相互关系分析产品的失效，在传统可靠性工程中主要应用于机械产品可靠性分析，本文将这一模型理论运用于可靠性强化试验中，推导出了利用，强化试验数据计算产品可靠度的相关公式，将定力量分析引入RET中，解决了RET无法进行定量分析的问题。

The exponential distribution family and minimum error theory are brought to bear combined with fact.

针对小样本和小失效数给系统可靠性分析带来的难度，以及可靠性分布函数和参数估计的不确定性和模糊性，运用指数分布族、最小误差原理等相关理论，结合实际工程经验，对这类系统的可靠性分析提出了一种新的方法。

Due to its good effect in the reservation of information of signal abrupt change, mathematical morphology is often applied in the detection and location of short-term power quality disturbance, however, there is still a defect of invalid detection existing in partial detection methods based on mathematical morphology while some zero-crossing disturbances are detected. In this paper three mathematical morphology based disturbance detection and location methods, i.e., the method based on first-order derivation and morphological gradient, the method based on morphological gradient and soft threshold processing and the method based on dq decomposition and top-hat transform, are analyzed, that is, by means of simulation the adaptability of these methods in the analysis on the signals of voltage sag, voltage swell and electromagnetic transient oscillation is compared.

数学形态学因其在保留信号突变点信息方面有很好的效果，因此常用于短时电能质量扰动的检测和定位，但基于数学形态学的部分方法仍存在对某些过零点扰动检测失效的缺点，文章分析了3种基于数学形态学的扰动检测和定位方法，即基于1阶求导和形态梯度的方法、基于形态梯度和软阈值处理的方法、基于dq分解和高帽变换的方法，通过仿真比较了3种方法在分析电压暂降、电压暂升、电磁暂态振荡等信号方面的适应性，结果发现基于dq分解和高帽变换的方法在检测过零点扰动时具有很好的效果，因此选取这种方法对实测扰动数据进行了检测和定位分析。

Based on the equivalent transformation from fuzzy possibility distribution to random probability density distribution, the fuzzy random failure probability calculation can be formulated easily, and a First Order and Second Moment method for fuzzy - random analysis is established.

提出了模糊随机可靠性分析的近似解析和数字模拟综合方法，基于模糊变量的等价随机化变换，可以方便地得到模糊随机失效概率的计算公式，并建立了模糊随机可靠性分析的一次二阶矩法。

The fault tree analysis is the causality of failures from the top tree event to the bottom tree event.

故障树分析方法是从分析失效因果关系中的顶部事件开始直到底部事件。

The fault tree analyzes the causality of failures from the top tree event to the bottom tree event.

故障树分析方法是从分析失效因果关系中的顶部事件开始直到底部事件。

The three fail form of scoring,fillister and corrosion for 127 mm(5) S135 drill rod joint ,corrosion rate and corrosion production have been researched by means of analysis of chemical composition and microstructure,testing of mechanical property.

通过化学成分分析、力学性能测试、组织结构分析和高温高压模拟试验，对127 mm(5)S135钻杆接头内壁出现划痕、凹槽和腐蚀三种失效形式，钻杆的腐蚀速率和腐蚀产物进行分析研究。

A macro and micro and chemical element analysis was made on fracture of ruptured coupling bolts,torsion test was performed and stress analysis and calculation were made,the results show that when the steam turbine had failure,MP-LP rotor coupling bolts and generator-exciter rotor coupling bolts failure were classified as overload shear fracture with partial deformation .

对215MW汽轮机断裂的对轮螺栓做断口宏观、微观分析，化学元素分析，扭转试验及受力分析计算，结果表明汽轮机组在事故中，中压-低压转子对轮螺栓和发电机-励磁机转子对轮螺柱的失效类型为：过载剪切断裂，同时局部挤压变形，这是由于事故过程中轴系受到冲击扭矩作用而引起的。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。