风冷冷水机组冷凝部分的设计及探讨

风冷冷凝部分是风冷冷水机组的重要组成部分,因此在设计中要加以重视。着重对风冷冷水机组冷凝部分的常规结构进行了阐述和分析,并针对性地提出了一些新的设计思路以解决实际应用中经常遇到的一些难题,希望对相关设计人员有一定的参考与借鉴意义。     

Application of Deep Hole Drilling to the Measurement and Analysis of Residual Stresses in Steel Shrink‐Fitted Assemblies

Abstract: Residual stress measurement of shrink‐fitted assemblies was achieved through finite element simulations and experiments using the deep hole drilling technique. Shrink‐fitted assemblies using stainless steel and cast iron were manufactured and residual stresses measured using a combination of deep hole and centre hole drilling. The results from the finite element simulations demonstrated that modifications to the deep hole drilling method were required to account for plastic relaxation during the measurement process. This was verified through the experimental measurements. The results from both the stainless steel and cast iron assemblies provided a clear demonstration that the final residual stress state was a consequence of the machining and assembly of the components.     

遗传算法支持下的孔组复合位置度误差评判

在孔组复合位置度误差评判过程中,用传统的数值优化方法一般难以找到符合最小条件判别准则的几何图框理想位置,尤其当位置度公差遵守最大实体要求且被测要素尚未达到最小实体尺寸时,被判为不合格的零件还有被修复的可能。针对上述问题,可利用自适应遗传算法全局搜索几何图框最佳位置,并在搜索过程中同时考虑遵守最大实体要求时的误差补偿因素的影响。此外,针对不合格零件进行的可修复性判别和修正量的计算,进一步降低了零件误废率。     

自磨机排矿格子板结构改进实践

本文论述了自磨机排矿格子板结构改进的原因,必要性及方案等,对同类格子板结构改进有较大参考价值。