交变载荷

The computer simulation method was used to study the dynamical bchaviour of an array of long, straight, parallel coplanar dislocations containing a source under alternating loading which is sinusoidal function of time.

本文利用计算机模拟的方法研究了在交变载荷作用下有源位错群的动力学特性。

The results show that fatigue crack began to initiate at an interior inclusion at about 5%-10% of fatigue lifetime, and then many micro-cracks formed dispersively due to the decohesion of spherical carbide around the inclusion from the matrix, which will grow and coalesce each other with fatigue processing.

这种现象被认为是由于材料内部存在的非金属夹杂物引起的闭。目前的长寿命疲劳设计是以材料或结构在1护次应力循环的实验数据为基准的，而机器和结构承受1丁以上交变载荷的情况并不少见[3]。

Load spectrum determination of tubing inwall proves the tubing is acted by the axial alternating load in a rod pumped well, and all the fractures are located at the root of the tooth.

油管内壁载荷谱测定进一步明确了油管在工作状态下承受轴向拉-拉交变载荷，其断裂部位全部在应力集中的齿根处。

We can see it clearly that even average wind speed is the same, when wind direction, overfall and other condition change, the generator

利用风力机设计软件Bladed程序我们可以很明显地看到（详见图1、图2）：即使在平均风速相同，但随着风向、湍流和其他条件的变化，机组特别是齿轮箱所承受的交变载荷完全不一样。

We can see it clearly that even average wind speed is the same, when wind direction, overfall and other condition change, the generator set ,especially the gear box is taken quite different changing load with help of blade program of wind power design software.

利用风力机设计软件Bladed程序我们可以很明显地看到(详见图1，图2)：即使在平均风速相同，但随着风向，湍流和其他条件的变化，机组特别是齿轮箱所承受的交变载荷完全不一样。

The diesel engine crank is one of the parts with high technology requirments and high cost. It is easy to be damaged for bearing heavy periodic reversal load.

曲轴是柴油机中技术要求高，造价较昂贵的部件之一，由于其工作中承受较大的周期性的交变载荷，故容易损坏。

Then, the system life predication method and the Reliability distribution method of system is presented.

针对目前大部分零件的寿命试验数据都是在恒定交变载荷下取得的情况，结出了载荷相关的系统可靠性分析方法。

A kinematic analysis theory and numerical method for shakedown analysis of periodic ductile composite materials are presented.

本文提出了在交变载荷下周期性韧性复合材料安定分析的机动理论和数值方法。

Connecting of doubler strake is a relatively weak link, fatigue strength of which is largely reduced due to the influence of the weld flaw, weld inside stress and weld surface figure. If the ship is under the alternate load function for a long time in long service, fatigue destruction of connecting may happen, strength of deck plating or bottom plating strengthened may also be influenced.

复板条的对接接头是一个相对薄弱的环节，由于焊缝缺陷、焊接内应力、焊缝表面形状等因素的影响，使得接头的疲劳强度大幅度降低，船舶在营运过程中长期受到交变载荷的作用，就会引起对接接头的疲劳破坏，继而影响到被加强的甲板或船底板。

Based on the dynamics analysis of the fastener that suffered impact or alternating load, an effective design scheme of the hydraulic power mechanism of the fastener tranverse viberation bedstand with the limitation of the oil power is presented in this paper.

在对紧固件承受横向冲击或交变载荷时进行动力学分析的基础上，对紧固件横向振动试验台在油源功率受限的条件下的液压动力机构的设计问题，提出了有效的解决方案，即用相对较大的动力机构的功率配置来降低系统对油源功率的要求，同时用双阀并联的方法克服了大流量伺服阀频宽较低对系统频宽的影

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。