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发动机拉缸是一种常见故障,对发动机性能有很大的影响,本文主要介绍了一起典型拉缸故障,该故障主要由于活塞模具原因导致活塞内腔结构与活塞原始设计结构存在差异引起的,本文用有限元方法具体分析了这种差异对活塞工作时裙部变形量的影响,分析并解决了拉缸故障。 相似文献
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活塞动力学仿真及在拉缸分析中的应用 总被引:1,自引:0,他引:1
针对某型发动机开发实验过程中出现的拉缸现象,建立活塞一连杆组动力学模型,并进行数值仿真分析。通过一个工作循环的模拟,获得了活塞与缸套之间的接触应力及间隙、活塞在缸套中的瞬时运动特性,并与实验结果对比,找出拉缸产生的原因,为优化活塞外轮廓形线提供了理论依据。 相似文献
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作者从G300ZC10B柴油机试车时发生的几次拉缸事故出发,对可能引起拉缸的几个主要因素逐一进行分析,找出了引起柴油机拉缸的关键因素。通过改进活塞型面结构,有效地抑制了G300ZC10B柴油机拉缸事故的再次发生。 相似文献
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1柴油机拉缸
柴油机汽缸因高温高压气体的推动、爆振或活塞剧烈的摩擦都会使缸壁拉伤,并出现金属剥落及竖向沟槽而影响柴油机正常工作,汽缸壁上沿活塞运行的方向出现一条条深度不等的沟纹。此现象称为拉缸。 相似文献
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根据孔系零件数控加工的特点,分析了常用点位直线刀轨路径设计时轮廓误差产生的原因以及减小此类误差的原理,在此基础上提出了优化刀轨路径需考虑的若干问题。 相似文献
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Chris Hewett 《Refocus》2001,2(9):26-28
Even before September 11, the world's governments were beginning to look at energy policy in the light of new pressures. Fluctuating oil and gas prices had already brought energy security to the fore in some countries, and the declining nuclear industry is creating fear of a looming gap in electricity generation capacity on both sides of the Atlantic. Finally, the need to reduce greenhouse gas emissions has been highlighted again by the Third Assessment Report of the Inter-Governmental Panel on Climate Change. The United States response to these pressures has been to ignore the climate change issue and retreat into an old style predict and provide mentality to tackle energy security. It forecasts the need for up to 1900 new large scale power stations to meet its escalating demand for energy. But if climate change is taken seriously, as the rest of world's governments do, more innovative methods of delivering secure energy supplies, whilst cutting greenhouse gases, have to be found. Clearly renewable energy will be at the forefront of such a strategy, but the implications for energy policy go far deeper than just replacing one set of electricity generators with another. The whole policy framework will need an overhaul. Chris Hewett, Institute for Public Policy Research, UK looks at options for the road ahead and how decentralised energy systems can help deliver the sort of low carbon economy needed to prevent climate change. 相似文献
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