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In order to calculate the crack expansion life in the action of variable amplitude load for the metal bar with V-shaped notch, the formula of bar fracture frequency was obtained theoretically by setting a size of bar fracture region applied in the engineering. Based on it, the mathematic expression of crack expansion life of bar V-shapednotch tip in the action of variable amplitude load was built.

针对金属棒料在变幅载荷作用下需要较精确地获取其V形槽尖端裂纹扩展寿命的问题,通过给定一个工程上能接受的瞬断区尺寸,获得了棒料断裂频率的计算公式,在此基础上,建立了变幅载荷作用下棒料V形槽尖端裂纹扩展寿命的数学表达式。

If you define a greedy macro, you are effectively telling NASM how it should expand the macro given any number of parameters from the actual number specified up to infinity; in this case, for example, NASM now knows what to do when it sees a call to writefile with 2, 3, 4 or more parameters.

如果你定义了一个贪婪宏,你也就告诉了NASM如何扩展这个宏,无论参数个数多大。本例中当NASM看到用2,3,4等多个参数调用writefile时知道如何去扩展它。

At last,we use these feature regions to construct affine invariant s,based on affine geometry invariant property.

利用仿射区域划分获取一组扩展质心集合作为图像特征点集;求解特征点集的凸包,根据扩展质心的性质将凸包顶点均匀组合成若干特征区域;利用仿射几何性质构造了有效的仿射不变量。

The machine's control system adopts a delta DVP14SS11R and a module of DVP16SP11R (16 I/O expansion module).It Composes 40 PLC control section. It adopts a module of DVP02DA-S (2 group simulation quantity output module) to control main frequency conversion and fluctuation frequency conversion actuation. The machine also adopts a delta TP04-AS2 Text display monitor carrying on the system external input with to reel thread the data monitoring. Use plate alternating current machine driver VFD-B-P series frequency changer controlmasterdrive electrical machinery and ring board electrical machinery.

该机型整个控制系统采用了一套台达DVP14SS11R控制单元,配DVP16SP11R扩展模块(16点I/O扩展),来组成40点PLC控制部分,采用一块DVP02DA-S(2路模拟量输出模块)分别控制主变频和升降变频驱动,同时采用台达TP04-AS2文本显示屏进行系统外部输入与纺纱数据的监控,使用台达VFD-B-P系列变频器控制主传动电机和钢领板电机。

The machine's control system adopts a delta DVP14SS11R and a module of DVP16SP11R (16 I/O expansion module).It Composes 40 PLC control section. It adopts a module of DVP02DA-S (2 group simulation quantity output module) to control main frequency conversion and fluctuation frequency conversion actuation. The machine also adopts a delta TP04-AS2 Text display monitor carrying on the system external input with to reel thread the data monitoring. Use plate alternating current machine driver VFD-B-P series frequency changer control master drive electrical machinery and ring board electrical machinery.

该机型整个控制系统采用了一套台达DVP14SS11R控制单元,配DVP16SP11R扩展模块(16点I/O扩展),来组成40点PLC控制部分,采用一块DVP02DA-S(2路模拟量输出模块)分别控制主变频和升降变频驱动,同时采用台达TP04-AS2文本显示屏进行系统外部输入与纺纱数据的监控,使用台达VFD-B-P系列变频器控制主传动电机和钢领板电机。

The machine also adopts a delta TP04-AS2 Text display monitor carrying on the system external input with to reel thread the data monitoring. Use plate alternating current machine driver VFD-B-P series frequency changer control master drive electrical machinery and ring board electrical machinery.

该机型整个控制系统采用了一套台达DVP14SS11R控制单元,配DVP16SP11R扩展模块(16点I/O扩展),来组成40点PLC控制部分,采用一块DVP02DA-S(2路模拟量输出模块)分别控制主变频和升降变频驱动,同时采用台达TP04-AS2文本显示屏进行系统外部输入与纺纱数据的监控,使用台达VFD-B-P系列变频器控制主传动电机和钢领板电机。

It Composes 40 PLC control section. It adopts a module of DVP02DA-S (2 group simulation quantity output module) to control main frequency conversion and fluctuation frequency conversion actuation. The machine also adopts a delta TP04-AS2 Text display monitor carrying on the system external input with to reel thread the data monitoring. Use plate alternating current machine driver VFD-B-P series frequency changer control master drive electrical machinery and ring board electrical machinery.

该机型整个控制系统采用了一套台达DVP14SS11R控制单元,配DVP16SP11R扩展模块(16点I/O扩展),来组成40点PLC控制部分,采用一块DVP02DA-S(2路模拟量输出模块)分别控制主变频和升降变频驱动,同时采用台达TP04-AS2文本显示屏进行系统外部输入与纺纱数据的监控,使用台达VFD-B-P系列变频器控制主传动电机和钢领板电机。

Self-fluxing Fe-Cr-Ni-B-Si alloy prowders are laser clad on medium carbon steel substrate of dimensions 80×35×10mm〓. The investigation results of this clad layer are: micro-defects, micro-cavity and occluded forin substance, are the micro-cracks and crack resourses in clad layer; crack of coating propagates along the boundary of two kinds of eutectic sutructure; The included angle θ between the cracking direction and laser scanning direction in multitrack overlapping clad is smaller than that in one-track clad because of crack propagating along crystalline growth direction and crystalline direction in overlapping zone being different from it in one-track clad.

在调质态的45〓钢表面,采用预置粉末法进行FeCrNiBSi合金的多道搭接激光熔覆,对其熔覆层进行分析表明:多道搭接激光熔覆层裂纹扩展方向与激光扫描方向间的夹角θ与单道熔覆时相比明显变小,前者θ0°,后者θ角基本都为90°,这主要是因为多道搭接时,搭接区结晶方向发生了变化以及裂纹沿结晶方向扩展所致;激光熔覆层裂纹大多是以覆层与基材交界面的孔洞、熔覆层内不同方向共晶团间的显微缩孔、夹杂物的边界等三种显微缺陷作为裂纹源,并沿低熔点物相形成元素偏析造成弱化膜的共晶团界面扩展延伸。

The results show that the temperature of the alloy gradually decreases from the casting mouth to the exit in the roll-shoe gap, and the isothermal line deviates from the shoe side to the roll side.

结果表明:辊靴型腔内合金的温度从入口至出口逐渐降低,合金等温线向工作辊偏移;随着浇注温度的降低,辊靴型腔内半固态区间逐渐增大;为了获得优良的半固态金属浆料,确定浇注温度为710~770 ℃;合金在辊靴型腔内层流运动时,越靠近工作辊内表面,合金的运动速度越快;随着挤压模具扩展角的增大,挤压模具出口型材宽度上中心与两侧边部合金的温度差减小;半固态合金进入模具后呈辐射状逐层向前推进填充模具扩展腔,最后再逐渐向模具出口合拢;为了改善模腔内金属流动速度的不均匀性,扩展角以45为宜。

The results of conversion show that the serious disc must be rejected because its reliable L-HCCF life is greatly less than an overhaul period. Finally, the load distribution of centrifugal and vibration force on labe is derived. Using two method, load on the crack labe gradually reducing and keeping constant with the crack propagation, a crack propagation analysis of fir-tree slot is carried out, and the calculating L-HCCF crack propagation life of slot on the unload method, which is nearly 3 times longer than that on constant method, is 20 times shorter than the pure low cycle life, and agree well with the experimental's.

最后,分析了离心力载荷和振动载荷在榫齿上的分布,进行了榫槽榫齿的有限元计算;提出了枞树型榫槽的卸载概念,并按带裂纹榫齿上的承载随裂纹增长而逐步减少和始终保持不变两种处理方法,进行了复合疲劳裂纹扩展及其寿命计算,由计算得出卸载下复合疲劳裂纹扩展寿命较单纯低周疲劳寿命下降二十多倍;按卸载处理的疲劳裂纹扩展寿命是按恒载处理的三倍多,前者与试验吻合,而后者则偏差较大。

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Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

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