世博庆典舟桥开启机构的设计

介绍了世博庆典舟桥开启过程及三种开启机构设计方案:双轴承液压缸驱动方案、双轴承螺旋桨驱动方案以及单轴承螺旋桨驱动方案;分别分析计算液压缸的功率、脉动情况及螺旋桨功率.     

Verification of form tolerances part II: Cylindricity and straightness of a median line

Most inspectors measure form tolerances as the minimum zone solution, which minimizes the maximum error between the datapoints and a reference feature. Current coordinate measuring machines verification algorithms are based on the least-squares solution, which minimizes the sum of the squared errors, resulting in a possible overestimation of the form tolerance. Therefore, although coordinate measuring machines algorithms successfully reject bad parts, they may also reject some good parts. The verification algorithms developed in this set of papers compute the minimum zone solution of a set of datapoints sampled from a part. Computing the minimum zone solution is inherently a nonlinear optimization problem. This paper develops a single verification methodology that can be applied to the cylindricity and straightness of a median line problems. The final implementable formulation solves a sequence of linear programs that converge to a local optimal solution. Given adequate initial conditions, this solution will be the minimum zone solution. This methodology is also applied to the problems of computing the minimum circumscribed cylinder and the maximum inscribed cylinder. Experimental evidence that the formulations are both robust and efficient is provided.     

电液锤活塞密封窜漏的原因分析及改进

电液锤液气缸活塞密封采用由PTFE制造的格莱圈密封,在使用中液压油会窜入气腔,导致气体压力升高。本文分析了由于缸体膨胀、密封失效而发生窜漏的两种原因,即液膜流过密封环时在气腔积聚和收锤造成的压力冲击。并提出了在格莱圈后安装Yx圈的改进措施。     

高效节能冰激凌机直冷式冷冻缸蒸发器的设计

这里介绍了一种高效节能的冰激凌机螺旋翅片直冷式圆形冷冻缸蒸发器，并指出其实现的关键技术。     

SXQ3141G自卸车液压缸实验台液压系统的设计

本文论述了自卸汽车液压缸试验台的液压系统方案的确定与系统图的绘制,以及液压系统主要技术参数的计算。     

厚壁圆筒自增强塑—弹性交界面半径及自增强处理压力的简易计算

介绍用直接液压法进行厚壁圆筒自增强中塑—弹性交界面半径及自增强处理压力的简易计算方法。     

多层杯筒形零件流动控制成形工艺分析及成形力的计算

针对轿车安全气囊铝合金压盖零件，提出并分析流动控制成形工艺及控制腔的设计方法，给出了成形力的计算模型与近似计算公式。介绍了工艺实验的效果。试验结果表明，所提出流动控制成形技术具有重要的应用价值。     

小型装载机工作装置驱动缸的载荷计算

在对料堆中铲斗铲取过程进行受力分析的基础上,对装载机工作装置各构件进行了受力分析,建立了力及力矩平衡的矩阵方程。并就2种铲取方式对举升缸和转斗缸的载荷进行了计算。     

新型薄壁筒加工工艺技术的研究

通过对薄壁筒零件工艺特点的分析,进行了工艺方案的比较,介绍了该零件的加工工艺及相关控制措施,提供了解决该类零件加工问题的方法。     

最小外包容平行六面体和最小外包容圆柱

根据已给点列，给出了比现有文献更小的外包容平行六面体，并引进了最小外包容圆柱的定义、求解模型。给出了同一点列的最小外包客六面体与圆柱轴线间的4种情况，并用实例验证了所述模型和分析的可靠性。