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结合某发动机曲轴齿轮过盈装配的实际参数,建立了三维实体模型,采用有限元分析方法,对曲轴齿轮过盈装配进行计算分析,探讨了曲轴齿轮过盈装配时最大主应力、等效应力、接触压力等随过盈量的变化关系,为后续的曲轴齿轮过盈装配设计分析提供参考依据。 相似文献
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采用有限元软件ABAQUS建立机车轮对过盈配合的有限元模型,对HXN5型机车轮对压装过程进行弹性数值模拟,分析了不同过盈量和不同摩擦系数对压装压力曲线、最终压装压力的影响,对实际生产具有一定参考意义. 相似文献
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汽轮机套装叶轮接触问题的三维有限元分析 总被引:1,自引:0,他引:1
运用有限元分析软件SAMCEF,对某型号汽轮机套装叶轮与轴的过盈配合问题作三维模型计算分析,计算中采用接触单元处理过盈配合边界,得到了转子位移和应力分布,并对原来的过盈量设计进行了优化改进,在保证安全性的前提下减小了轮盘的接触应力。 相似文献
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针对钛铝合金涡轮与K418合金套的过盈连接结构存在的应力问题,以涡轮转子过盈连接结构为研究对象,设计型线结构并建立过盈连接结构应力预测模型,基于过盈连接结构应力预测模型分析不同型线对应力分布状态的影响。研究结果表明:过盈连接结构应力预测模型具有较高的精度,对平均接触应力的预测误差为0.67%,对最大Mises应力的预测误差为8.25%。采用过盈连接结构应力预测模型得到的型线优化设计方案使涡轮轴最大Mises应力减少了42.01%,而平均接触应力只减少了10.22%,增压器涡轮转子过盈连接结构可靠性显著提高。 相似文献
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通过对粉末冶金齿轮与齿轴过盈配合的分析,合理选择了齿轮和齿轴的过盈量及粉末冶金齿轮的强度,既保证了传递一定扭矩,又防止了粉末冶金齿轮运转中脆裂失效。 相似文献
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介绍发动机主轴瓦与轴瓦座孔间过盈装配的作用和意义,探讨过盈不足和微动磨损,分析并指出在轴瓦装配时,应在轴瓦的自由弹势,轴承的座孔,轴瓦的过盈量,轴瓦盖结合面处加垫片及瓦盖紧固螺栓的预紧力等方面是否符合要求给予注意。 相似文献
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对核电汽轮机多级共用轮盘复杂套装转子的结构特征、温度环境和力载荷进行了研究,利用Abaqus有限元软件计算了装配套装转子的应力场及稳态运行工况的温度场和应力场,并分析了轮盘与主轴装配过盈量对转子安全运行的影响.结果表明:稳态运行时套装转子表面的最高温度可达250℃,从进口到出口,套装转子温度沿轴向逐渐降低,出口端的最后一个轮盘温度低于70℃;稳态运行工况下离心力载荷和热膨胀对接触面装配应力的影响较为明显;稳态运行时,装配初期过盈量产生的接触面应力减小幅度较大,但仍能保证套装转子在现有过盈量下安全运行. 相似文献
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超临界汽轮机铸造主汽阀门蠕变强度有限元分析 总被引:2,自引:1,他引:1
采用有限元分析软件ANSYS对超临界600MW汽轮机主汽阀计算模型进行有限元分析,通过分析结果校核主汽阀的结构和材料是否能够满足机组运行时对主汽阀的要求. 相似文献
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M. H. Shojaefard A. R. Noorpoor D. A. Bozchaloe 《Numerical Heat Transfer, Part A: Applications》2013,63(7):627-644
ABSTRACT Internal combustion engines produce exhaust gases at extremely high temperatures and pressures. As these hot gases pass through the exhaust valve, temperatures of the valve, valve seat, and stem increase. To avoid any damage to the exhaust valve assembly, heat is transferred from the exhaust valve through different parts, especially the valve seat insert during the opening and closing cycle as they come into contact with each other. In this article, a finite-element method is used for modeling the transient thermal analysis of an exhaust valve. The temperature distribution and resultant thermal stresses at each opening and closing time are obtained. Detailed analyses are performed to estimate the boundary conditions of an internal combustion engine. The model includes exhaust valve, seat, guide, and spring. The analysis continues until a steady-state condition is obtained. In this study, ANSYS is employed for modeling and analysis of the exhaust valve. A methodology is developed for transient thermal analysis of the exhaust valve. 相似文献
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Damian Piotr Muniak 《热科学学报(英文版)》2018,27(5):487-495
The aim of the article is to propose the method of designing double regulation control valves used in heating installations, allowing to obtain a constant value of the so-called inner authority and thus the constancy of the valve control characteristic, regardless of the pre-setting value set on the valve. The shape of the valve's regulation characteristics is one of the main factors determining the quality of the quantitative regulation, and thus the stability of the system's operation and overall operating costs. For this reason, the issue discussed in the article is important and can be applied in practical implementations of the valve sizing and the valve selection.The analysis was based on the relations binding the hydraulic resistances occurring inside the control valve, and the corresponding flow factors, using original author’s proposal.The experimental verification was performed on a special measuring stand prepared for this purpose, measuring the values of the medium volume flow at a constant differential pressure, and then the results were converted into values of the flow factor, used in the proposed mathematical model.The results confirm the thesis put forward and the proposed mathematical model. High convergence of the results of experimental verification with the proposed mathematical model was obtained. 相似文献
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600MW汽轮机组再热主汽阀门阀杆的热胀及其影响 总被引:2,自引:0,他引:2
针对引进型600 MW汽轮机组再热主汽阀门的运动卡涩问题,利用有限元技术,对其关键装配部件进行了热-结构耦合分析.提出了阀杆的轴向不等齐热胀模型和运动间隙变化模型,通过实测数据及仿真对比验证了模型的合理性.基于ADAMS软件建立了以接触碰撞和磨损为特征的汽轮机再热主汽阀门机构的虚拟样机平台,并系统地研究了阀杆受热膨胀对阀门开关过程动态特性的影响,结果表明:阀门杆的热胀改变了阀杆运动间隙并进而导致阀门开关过程动态特性发生显著变化,这是导致阀门运动卡涩的重要原因之一.笔者还提出了改善阀门开关过程动态特性的建议性措施. 相似文献
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文章阐述了循环流化床锅炉运行中的磨损、结焦、灭火、堵灰、分离效率下降和U阀烟气反窜经常遇见的问题,并进行了系统的分析。 相似文献