塔设备法兰的强度计算

分析了承受外裁荷的塔设备法兰在预紧和操作状态下受力的影响，并给出了相应的强度计算方法。     

Calculation Model of Equivalent Strength for Induced Crack Based on Double-K Fracture Theory and Its Optimizing Setting in RCC Arch Dam

By means of fracture testing on roller-compacted concrete (RCC) three-point bending beams with two different specimen sizes, the P-CMOD complete curve for RCC was gained. Furthermore, by applying double-K fracture theory, KIC^ini,KIC^un, as well as the critical effective crack length and the critical crack tip opening displacement, were evaluated. Based on the double-K fracture parameters above, the calculation model of equivalent strength for induced crack was established, thus the calculation method on its initiation, stable propagation and unstable fracture was ascertained. Moreover, the finite element simulation analysis of stress field in ShaPai arch dam and the on-site observational splaying points of induced crack at different altitudes validated the reliability of the model. Finally, crack inducer‘s optimal setting in RCC arch dam was studied. It improves the design level of induced crack in RCC arch dam and satisfies the necessity of engineering practice.     

非稳定变载荷齿轮强度设计计算

介绍非稳定变载荷齿轮强度设计计算方法,谈材料的疲劳破坏、曼内尔的疲劳损伤累积理论以及“非稳定”变载的等效转化,即当量应力及当量循环次数。     

15CrMo低合金耐热钢焊接裂纹缺陷修补工艺

对15CrMo低合金耐热铜焊接,应依据化学成分及它的碳当量综合分析15CrMo钢的可焊性及裂纹敏感性。采用R307焊条进行焊接。     

提高MG2×150/700-WD型采煤机截割部轴承寿命周期的设计改进

通过改进结构及轴承类型,提高MG2×150/700-WD型交流电牵引采煤机截割部轴承使用周期。     

等厚圆盘塑性区的本构关系

等厚圆盘在设计上有时允许出现局部塑性区,用全量理论导出塑性区的本构方程,力学概念较为明晰,在此基础上进一步导出了塑性状态下当量应变Ed和材料割线模量E′的计算显式,在进行塑性区内的应力应变换算时,将它们与本构方程联立,。可使试算逼近工作大大简化。     

基于GIS及VB的淮南城市交通规划系统的研究

分析了淮南城市交通现状,提出了系统的总体架构及各模块的基本功能,对系统的开发工具做了简要说明。最后对城市交通专题分析模块中的事故分析子模块进行了设计实现。     

电梯曳引力失效实例分析

曳引驱动电梯是有钢丝绳和曳引轮槽之间摩擦而产生曳引力来驱动轿厢上下运动的.电梯系统曳引能力应满足在轿厢装载和紧急制动工况中提供足够的曳引力,在轿厢滞留工况中钢丝绳能在曳引轮槽中打滑.本文根据一个实际的电梯在滞留工况不打滑的故障案例,分析了能够引起曳引力和曳引系数的变化的因素,并找出导致曳引力失效的原因.并讨论了改善电梯系统曳引能力的措施,希望对电梯使用和维护的重要性有所帮助     

我国科技投资回报转换当量探析

通过6所985高校的小样本数据推测出每30万元投入产出1篇国际论文或1件发明专利、每10万元投入产出1篇国内论文,从而获得1篇国际论文或1件发明专利相当于0.3百万元、1篇国内论文相当于0.1百万元的科技投资回报转换当量。全国科技产出按该当量折算后基本对合国家财政科技拨款,因而可供国内估算参考。