共查询到20条相似文献,搜索用时 78 毫秒
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介绍了太原重工技术中心研制的的国内首条4000t水压试验机组的机构特点和性能参数。该水压试验机是目前国内试验压力最大的,并首次采用了倾斜机架布置方式及滚动支撑结构的新型设备。 相似文献
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介绍钢管探伤检验设备采用计算机自动控制后,改变了过去长时间几名操作人员手动协调操作的落后方法,此项技术改造投资少控制先进,可靠,效益高。 相似文献
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根据高炉冷却壁水压试验时出现的压力波动现象,分析了压力变化产生的原因,提出了合理的水压试验工艺方法,并设计了一种结构新颖的快速水管接头,提高了压力试验效率,对冷却壁制造厂家和炼铁企业具有一定的参考价值。 相似文献
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介绍了泥炮机的主要结构和工作原理,分析现有回转回路的液压原理,提出用于液压仿真的简化回路,并利用AMEsim软件建立了简化回路的模型。对回转油缸、液控单向阀和电液换向阀的运动特性进行仿真分析,得到回转油缸爬行故障的原因。最后提出采用外控外排型电液换向阀和增加独立先导油源的改进方案,并再次利用仿真软件建立改进回路的模型,通过仿真分析验证改进回路的可行性,为进一步的改造实践提供了依据。 相似文献
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对液压扳手手柄进行实体几何建模、力学建模、施加荷载和约束,利用三维空间有限元方法对手柄的孔边应力集中进行细致的研究,得到液压扳手各部位应力和变形的精确数值,找出孔边应力集中区域及其危险程度。为加强结构强度或减少冗余结构部分提供了有力的设计依据。 相似文献
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Analysis of a slug test to estimate hydraulic conductivity of a vertical cutoff wall is complicated by the high compressibility of the backfill materials and by the proximity of the well intake section to the edge of the cutoff wall. The writers developed two methods to evaluate hydraulic conductivity of the vertical cutoff wall with the aid of a numerical program, Slug_3D. The first method, named the type curve method, expands the general type curve concept frequently used by hydrogeologists to take into account the complex boundary conditions of the vertical cutoff wall. The other method, named the modified linear curve fitting method and modified from the Hvorslev and the Bouwer and Rice methods, provides an easy and practical way of evaluating hydraulic conductivity of the vertical cutoff wall. To illustrate the use of the type curve and the modified linear curve fitting methods in practice, a case study involving two slug tests at a landfill site is presented. The methods are shown to be useful and practical. 相似文献
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液压系统在冶金设备上的应用日益广泛,液压系统的日常维护特别重要。通过对冶金设备液压系统故障的初步分析,提出了在日常维护过程中确保液压系统可靠运行的一些注意事项,对设备的维护管理具有一定的指导作用。 相似文献
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Jim W. Hall Shawn A. Boyce Yueling Wang Richard J. Dawson Stefano Tarantola Andrea Saltelli 《Canadian Metallurgical Quarterly》2009,135(11):959-969
Sensitivity analysis is well recognized as being an important aspect of the responsible use of hydraulic models. This paper reviews a range of methods for sensitivity analysis. Two applications, one to a simple pipe bend example and the second to an advanced Shallow Water Equation solver, illustrate the deficiencies of standardized regression coefficients in the context of functionally nonlinear models. Derivatives and other local methods of sensitivity analysis are shown to give an incomplete picture of model response over the range of variability in the model inputs. The use of global variance-based sensitivity analysis is shown to be more general in its applicability and in its capacity to reflect nonlinear processes and the effects of interactions among variables. 相似文献