失效的

An advanced branch and bound method which reduces the computer resolving time enormously and leads the reliability research of large-scale spatial frame structural systems close to practical use is presented on condition that the same computation accuracy is ensured.

导出了大型空间刚架结构系统某梁元断面达到塑性屈服极限时的修正刚度矩阵和相应的等效节点力向量；提出了在保证同等计算精度的条件下，可成倍地减少运算时间的改进分枝限界方法，使大型空间刚架结构系统的可靠性研究向实用化迈进；本文开发出可自动生成失效衡准，自动选择主要失效形式，追踪失效过程的计算机程序。

In presented method, the correlated variables are transformed into uncorrelated variables equivalently, and the performance functions in the correlated variables space are transformed into those in the equivalent uncorrelated variables space, in which the reliability sensitivity of the system failure probability with respect to the distribution parameters of the uncorrelated variables can be solved by the moment method for the uncorrelated variables. Finally the equivalent relationship between the correlated variables and the uncorrelated variables, the chain rule for derivative are employed to obtain the reliability sensitivity of the system failure probability with respect to the means of the correlated variables.

在所提的方法中，首先将相关变量空间等效转化为不相关变量空间，并将系统多个失效模式的功能函数转化为不相关变量空间的功能函数，进而利用矩方法得到多模式系统失效概率对不相关变量空间基本分布参数的灵敏度，最后利用相关变量空间与不相关变量空间的等价关系及复合函数求导法则，求得多模式系统失效概率对相关变量空间中变量均值的灵敏度。

Based on the function and reliability, the design principle for thepermanent magnetic bearing in rotating machine is put forward. FailureMode Effect and Criticality Analysis is studied for thepermanent magnetic bearing, and corresponding designs for magneticbearing are made to enhance the reliability. In addition, the main failuremode and failure causes are found by FMECA, it is found that theadditional alternate magnetic field within the machine causing thepermanent magnet to demagnetize is the main failure mode of thepermanent magnetic bearing in rotating machine.

本文提出了基于功能和可靠性的旋转机械永磁轴承的设计原理，对旋转机械永磁轴承进行了失效模式影响及危害度分析，并相应地提出可靠性设计措施，以提高永磁轴承的可靠性，同时通过FMECA找出了影响永磁轴承可靠性的主要失效模式及失效因素。

In the event failures of boring tools, the fatigue failure of the drill collar is especially prominent.

在钻具失效事故中，钻铤的疲劳失效尤为突出。

In the paper, based on the hypothesis that the failure of every poles is independent and by the method of reliability assign and reassign, the difficult problem of disposing the structure system reliability constraints is solved. Based on sensitivity information, the given system failure probability can be replaced by the sum of every element failure probability.

针对基于体系可靠性约束优化设计的关键问题一结构体系可靠性的分析和计算，在基于结构各单元失效相互独立假设的基础上，提出了以各单元失效概率摘要之和近似体系失效概率的处理方法，并给出了体系可靠性分配和再分配的方法，以确保结构体系在优化过程中的可靠性，实现了结构基于体系可靠性的优化设计。

In the paper, based on the hypothesis that the failure of every poles is independent and by the method of reliability assign and reassign, the difficult problem of disposing the structure system reliability constraints is solved. Based on sensitivity information, the given system failure probability can be replaced by the sum of every element failure probability. And then the structural optimization design based on system reliability is preceded.

针对基于体系可靠性约束优化设计的关键问题一结构体系可靠性的分析和计算，在基于结构各单元失效相互独立假设的基础上，提出了以各单元失效概率之和近似体系失效概率的处理方法，并给出了体系可靠性分配和再分配的方法，以确保结构体系在优化过程中的可靠性，实现了结构基于体系可靠性的优化设计。

In this paper, the failure problem of the pipeline systems on the platform is researched by spot test, monitor, and numerical simulation. It is pointed out the major criterion of the failure mode and this kind of failure mode is inevitable. In order to improve the condition the pipeline ice-resistant rank should be enhanced.

本文通过现场检测、监测和数值模拟等手段对海洋平台上部管线系统的失效问题进行研究，给出该失效模式的主要判据，并且指出该种失效模式是无法避免的，应提高管线的抗振设防等级。

From the calculation results of an example, it is found that the total probability of failure of a structural system will not equal to the sum of the probabilities of failure for all the individual failure modes.

从其对耐压圆柱壳的计算结果可以看出，潜艇耐压圆柱壳结构的失效概率并不等于各失效模式的失效概率之和，这不同于Faulkner做出的求和理论假定。

The statistics of drill tool failures data from the oil field shows almost fatigue failures of drill tools are related to thread f...

现场钻具失效资料的统计分析表明，绝大多数的钻具失效都与连接螺纹的疲劳失效有关。

The reliability of single-disk, double-disks, multi-disks failure, and the system with redundant hardware are analyzed and calculated.

5分别对单个磁盘驱动器的可靠性、RAID-O级的可靠性、单盘失效、双盘失效、多盘失效以及加冗余支持硬件的系统的可靠性进行了分析和计算。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐