高压电气产品铝合金支架铸件的工艺优化

高压电气铝合金支架铸件,原工艺采用金属型树脂砂芯倾转铸造一模一件,由于产品需求量激增,质量要求逐渐提高,现有的一模一件倾转模具已满足不了客户需求。通过优化工艺方案,采用金属型低压铸造(取消树脂砂芯)一模八件的生产方式,大大提高了铸件的生产效率和工艺出品率,并降低了成本。     

基于双面组件的可调支架光伏发电系统仿真研究

以双面光伏组件和可调支架系统为基础,以青海格尔木为模拟地点,利用PVsyst光伏仿真软件,分析了不同调节次数的可调支架系统与固定支架系统在组件正面和背面辐射量、系统发电量、系统收益的差异。研究结果表明：通过调节支架改变光伏组件的角度后,组件最低点离地高度也在变化,直接影响组件正面和背面的辐射接收;光伏方阵前后间距影响土地利用率（GCR）,土地利用率降低后,背面的辐射量和系统发电量都有一定的增加;相对于固定支架双面发电系统,可调支架双面系统在不同调节次数下的组件背面全年辐射量均有一定降低,但整体的发电量得益于正面辐射的增益,最高可达4.8%左右;技术和经济比较结果显示,双面组件采用可调支架系统,每年2次的调节方式,25年生命周期内系统收益最高。文章还分析了单面发电组件和双面组件系统使用可调支架的经济性对比,在相同的调节次数下,双面组件系统的增益明显高于单面组件系统。本文的研究成果对可调支架双面组件发电系统的设计具指导作用。     

Influence analysis of bracket set on seismic performance of steel eave columns in Chinese traditional style buildings

This paper presents influence analysis of bracket set on seismic performance of steel eave columns in Chinese traditional style buildings. Eight 1/1.5‐scale steel eave columns were constructed and tested under low cyclic reversed loading, including 4 specimens with bracket set and 4 specimens without bracket set. Based on the analysis of the strain of the specimens, the failure modes of the specimens were obtained. In addition, the hysteresis loops, skeleton curves, degradations of stiffness and strength, ductility, and dissipation capacities of the specimens were analyzed. Bracket set changed the force transfer mechanisms and failure modes of the specimens and had a significant influence on the seismic performance of the specimens. Compared with the specimens without bracket set, the yielded and ultimate bearing capacities of the specimens with bracket set improved by 30.7% and 24.0%, respectively. And also, the stiffness of the specimens with bracket set at the yielded and ultimate points increased by 52.8% and 135.6%. The dissipation capacities of the specimens with bracket set were 2.12 times those of the specimens without bracket set at yielded load. However, the ductility of the specimens with bracket set slightly decreased by 8.5%. It was shown that the seismic performance of the specimens with bracket set was better than that of the specimens without bracket set. The work in this paper provides a basis for further theoretical study on the seismic performance of steel eave columns in Chinese traditional style buildings.     

基于惯性释放理论及子模型法的平衡轴支架优化

为提升平衡轴支架强度计算准确度及全面性,建立了某6x4自卸载货车刚柔耦合的整车模型,计算了各工况下车架连接点的载荷,并以此作为边界载荷输入,在利用惯性释放原理提升边界设置合理性的基础上,运用子模型法克服了惯性释放无法进行接触非线性计算的问题,通过建立接触单元、细化网格等方法,对该支架进行了七工况的结构非线性强度计算,并与实际失效模式及应力测试结果进行了对比,且提出并验证了改进方案。结果表明:该方法具有快速、准确的特点,可有效指导产品设计及改进。     

缠绕式双滚筒提升机优化起吊检修方案

提升机滚筒主轴检修过程中,由于组装"龙门架"困难,起吊滚筒时又容易造成主轴位移,引起偏摆,导致联轴器螺栓剪切变形。针对此问题,结合提升机滚筒结构,重新设计托架结构,提升检修安全系数。     

“三软"不稳定厚煤层综采放顶煤快速移架技术

介绍了在“三软”不稳定厚煤层地质条件下,经过长期实践,创建了一套适应“三软”煤层地质条件的综放支架快速移架技术。利用抬腿油缸及前、后立柱把支架底座抬起,消除了底座陷底所产生的阻力。     

北江特大桥主墩现浇段支架设计与施工

以国道主干线广州绕城公路西环南段北江特大桥为例,介绍了主墩0号块、1号块及边跨现浇段搭设钢管桩平台法和预埋钢板焊接牛腿托架法两者相结合的支架设计方法与施工技术。     

灵江特大桥栈桥设计与计算

结合工程概况,从梁Ⅰ40a工字钢检算、Ⅰ16工字钢栈桥横向分配梁、Ⅰ28b支座垫梁验算、钢管桩自由长度及稳定性验算、栈桥钢管桩单桩承载力计算等方面介绍了栈桥的设计与计算过程,以供类似桥梁工程的设计参考。     

中承式钢箱提篮拱先梁后拱安装施工方法

从支架的布置、起吊设备、拱座、钢箱拱肋安装及钢箱梁的安装四方面介绍了钟宅湾大桥中承式钢箱提篮拱先梁后拱安装施工方法，施工结果显示，满足规范要求。     

悬灌桥直线段及边中跨合拢段施工技术方案

以南边跨为主介绍了樵岭前悬灌大桥直线段，边中跨合拢段施工技术方案、施工操作要点及效果，工程实践结果证明了其方案是可行的，保证了工期和质量。