故障

According to analyzing the characteristic of the logic of "and" and "or" gates, this paper derives a conversion rule between the logic of fault tree and the step function. Using this conversion, we can convert fault tree to step function which is easy to calculate by programming in the computer.

通过对故障树中逻辑"与"门和"或"门的特点进行分析，推导出故障树逻辑关系与阶跃函数之间的转换规则，利用该规则可将故障树转化为便于编程求解的函数表达式。

Fault-tree diagnosis(also called Fault-tree analysis) is a kind of analytical method to labor step by step the reason of system fault from collectivity to parts by a tree-system.

故障树诊断法也称故障树分析法，是一种将系统故障形成的原因由总体到部件按树枝状逐级细化的分析方法。

Simulation results prove that so long as both busbar stray capacitance and sampling frequency satisfy a certain condition, the proposed scheme can judge the fault accurately under various fault conditions. The proposed scheme possesses good selectivity and strong ability of anti-transition resistance, besides, it is more sensitive to the fault occurred at the end of transmission line.

仿真试验表明，只要母线杂散电容和采样频率满足一定的条件，该方法在各种故障条件下均能准确判断故障，具有很好的选择性，并且有很强的抗过渡电阻能力，对末端短路故障的反应灵敏度更高。

By the theoretical analysis of the subminiature breakdown of full flow during the test of the variable pump of constant voltage,we can find the reason of the breakdown and take measure to fix it.

通过对恒压式变量泵在试验中出现全流量超小故障的理论分析，找出了故障原因，并有针对性地采取了排除措施，即(1)减小弹簧刚度，(2)弹簧材料改为高温稳定性较好的材料，并经48小时加载荷压缩处理，(3)在试验中严格控制零流量压力公差，使故障有效排除，从而从根本上解决了生产中的疑难问题。

In the full paper which outlines our special design strategy; the two subtopics of topic 2 are the establishment of multi-models and switch conditions （subtopic 2.1） and the analysis of stability（subtopic 2.2）; in subtopic 2.2, based on the book written by Wang et al, we explain how all the controllers can have dynamic performances that are very similar in topic 3, we point out that eq.

首先建立作动器故障参数模型；然后根据故障的随机性，设计一系列并行的辨识模型，每个模型对应一种故障，同时对应于每个辨识模型建立一个控制器；最后根据飞行品质的要求，设计鲁棒跟踪控制器，由于控制器采用了积分项，可很好地抑制扰动。

Fused current method is adopted in the device for fault feeder detection. This method uses vector sum of compensated current and zero-sequence current and selects fault line according to different distribution of the sum.

该装置采用了一种新的接地选线的算法－电流融合算法，该算法将补偿电流与故障零序电流矢量求和，根据故障与非故障线路矢量和分布在不同区间作为选线判据。

At the same time,a new function of suspiciousness is presented.By using it we can analyze synthetically and locate the fault finally.

此外，还提出一种新的故障可疑度函数，在故障检测的最后阶段进行综合分析，可最终有效定位故障。

The phase of ω0 frequency fluctuates tempestuously. The resonance peaks of flexural and torsional vibrations response are present at 2/3ω0 1/2ω0 1/3ω0 and 1/4ω0 with three kinds cracked rotor models. Near 1/2ω0 frequency, quasi-periodic and chaotic motions maybe appear. Periodic, quasi-periodic and chaotic motions show on alternately when the rotating speed is near to 2/3ω0.Combined step-by-step integral method with traditional transfer matrix method, an increment transfer matrix method is put forward.

研究结果表明：各种故障情况下，华北电力大学博士学位论文弯振和扭振之间都存在祸合关系，但弯扭祸合振动一般不会威胁机组安全运行：在叶片丢失或滑环飞脱故障时，将产生很大的弯振，同时各转子扭振也将被激发出来，它以工倍频和前三阶固有频率为主；在各种电气故障情况下，各转子都很快被激励出较大幅值的扭振来，相应各转子弯振也发生一定的变化，但它的变化明显滞后于扭振，扭振和扭矩主要以前三阶固有频率为主。

The method of minimum tolerance is an optimal estimation algorithm, its amount of computing labor is less than that of existing methods yet the effect is the same.

文中推导了模块故障诊断方程，讨论了模块级故障诊断的自身特点及与其它诊断方法的关系，并对故障可测性、算法和非线性等问题进行了详细的研究。

In the power system failure transient period of time, be able to quickly determine the correct faults, failure to prevent the further development or change.

在电力系统发生故障的暂态时期内，能快速正确判断故障，阻止故障发生变化或进一步发展。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。