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《机械制造与自动化》2017,(1):183-186
油管接箍报警系统能实时检测带压作业中接箍的位置,为带压作业顺利地起、下油管提供一个准确的接箍报警信号。设计了一种接箍报警系统,由接箍报警装置与油管扶正装置组成。由于接箍报警装置壳体在井中要承受高压,需要对其结构进行分析计算,将壳体建模后导入到有限元分析软件ANSYS中分析出其最大变形、最大应力值,找出其最薄弱的部位,为其结构安全性提供一些参考;接箍报警的关键是要将油管保持在井口中心的位置,设计了一个油管扶正装置,解决了带压作业中接箍报警装置的误报情况,对油管与扶正滚轮进行运动接触应力仿真分析,分析得出油管接触应力的分布情况,为以后合理选择材料减轻磨损提供参考依据。 相似文献
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储气井是一种受交变压力载荷的高压储气设施,其分段的套管通过螺纹和接箍连接,这种螺纹连接的上扣扭矩影响螺纹结构的应力,进而影响储气井的疲劳寿命.建立了储气井套管和接箍螺纹连接的有限元模型,讨论了储气井上扣扭矩的计算方法及其对储气井疲劳性能的影响,并得出以下结论:上扣扭矩对于储气井内部应力分布具有较大影响,计算中不能被简单忽略;预紧力作用下,储气井套管内整体应力水平高于外部接箍,但最大应力却发生在接箍上;对于套管和接箍结构,最易发生疲劳破坏点是套管第一个整螺纹齿齿根或套管与接箍贴合处的螺纹齿齿根部;上扣扭矩没有改变套管和接箍处应力集中点的应力幅值,对储气井的疲劳特性影响较小. 相似文献
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管道开孔接管和三通设计及应力分析 总被引:1,自引:0,他引:1
通过对管道开孔接管和三通设计研究及有限元应力分析,获得了内压作用下的管道开孔接管和三通的应力分布特性.同时,对管道开孔接管和三通的结构尺寸进行了探讨,讨论了各参数的变化对管道开孔接管和三通应力的影响,得出了一些有价值的结论,达到了为管道开孔接管和三通设计和制造提供参考的目的. 相似文献
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压力管道三通结构破坏机理分析 总被引:1,自引:0,他引:1
本文主要针对压力管道中的三通结构多次破坏问题,改进三通结构,并应用有限元方法对该三通结构破坏机理进行了分析,比较改进前后的有限元计算结果得出:改进后的三通结构有效的降低了结构的应力集中。 相似文献
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Y形三通管接头在管道系统中是最常用的连接部件之一.将图解法和计算法相结合,用计算机进行数据计算、绘图,以代替图解法的手工作图,从而快速精确地展开由一个圆柱管和两个圆锥管组成的任意夹角的Y形三通管接头.用VC 6.0编程生成专用软件,根据用户输入的Y形三通管参数,完成计算和图形显示,同时将计算数据转换成DXF文件,供AutoCAD直接调用. 相似文献
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在水下航行器壳体连接设计中,卡箍连接设计在实际工程中得到了广泛应用.水下航行器入水过程及其复杂,目前研究对卡箍连接处的力学分析还不够充分.先对水下航行器入水瞬间,卡箍连接处进行力学分析,然后使用有限元和响应面近似法对受力分析加以验证,最后对某型水下航行器卡箍连接处最大弯曲应力进行函数拟合.最后对通过拟合的某型水下航行器... 相似文献
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To create a dynamic model of a pipeline system effectively and analyze its vibration characteristics, the mechanical characteristic parameters of the pipeline hoop, such as support stiffness and damping under dynamic load, must be obtained. In this study, an inverse method was developed by utilizing measured vibration data to identify the support stiffness and damping of a hoop. The procedure of identifying such parameters was described based on the measured natural frequencies and amplitudes of the frequency response functions (FRFs) of a pipeline system supported by two hoops. A dynamic model of the pipe-hoop system was built with the finite element method, and the formulas for solving the FRF of the pipeline system were provided. On the premise of selecting initial values reasonably, an inverse identification algorithm based on sensitivity analysis was proposed. A case study was performed, and the mechanical parameters of the hoop were identified using the proposed method. After introducing the identified values into the analysis model, the reliability of the identification results was validated by comparing the predicted and measured FRFs of the pipeline. Then, the developed method was used to identify the support stiffness and damping of the pipeline hoop under different preloads of the bolts. The influence of preload was also discussed. Results indicated that the support stiffness and damping of the hoop exhibited frequency-dependent characteristics. When the preloads of the bolts increased, the support stiffness increased, whereas the support damping decreased. 相似文献
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含环向减薄缺陷主蒸汽管道蠕变应力变化规律研究 总被引:1,自引:0,他引:1
厚壁耐热钢广泛应用于高温电厂的主蒸汽管道。局部减薄缺陷是高温压力管道常见的体积型缺陷,局部减薄缺陷的存在对高温环境下运行的管道应力重分布会产生较大的影响,降低管道的承载能力。采用大型有限元分析软件ABAQUS对在蠕变条件下运行、受内压作用含环向减薄缺陷主蒸汽管的蠕变应力进行了有限元数值模拟,获得了应力重分布的变化过程。结果表明,含环向减薄缺陷直管,由于存在结构不连续,导致应力水平提高。在高温环境下,应力最大位置和应力集中系数最大位置可能会随蠕变时间的变化而改变,给出了含环向减薄管道应该主要关注的位置。研究结果可为高温含环向减薄缺陷管道的安全评定和完整性分析提供依据。 相似文献
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刘胜勇 《现代制造技术与装备》2011,(3):58-59
借鉴空心圆轴扭转变形时的横截面应力模型和十字轴万向节危险断面的分析,把差速器行星齿轮轴假想为三部分——内花键空心箍、十字阶梯轴和渐开线花键,并关联分析其抗扭强度和十字轴轴颈根部抗弯能力;通过对行星齿轮轴扭矩传递影响因素的分析,提出并证明了解决行星齿轮轴断裂的可行性方法。 相似文献
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Identification of material properties in the hoop direction, such as stress–strain behavior, is essential in tube hydroforming processes. Conventional tests such as uniaxial tension and compression tests have some drawbacks and limitations. In the current investigations a simple technique to identify the stress–strain behavior in the hoop direction for tubular material is introduced, based on the experimental data obtained from tube lateral compression test. In the proposed technique, an assumed stress–strain curve is used in finite element simulation to predict the load deflection curve of the tube lateral compression. An iterative algorithm is used to compare the calculated and experimental load deflection curves until a good agreement with a percentage deviation less than 4% is obtained. The suggested technique was used to obtain the material properties of Cu–40%Zn brass tube. The predicted stress–strain curve was compared with that obtained from uniaxial compression test. Comparison between the experimental and predicted stress–strain curve showed that the proposed technique is effective in the prediction of the material properties from the tube lateral compression test with percentage deviation less than 1%. 相似文献
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钢丝缠绕增强塑料复合管(PSP)是我国自主研发的一种高新技术产品。由于基体高密度聚乙烯(HDPE)的粘弹性特性,PSP呈现出时间相关的力学行为。提出一个PSP线粘弹性结构力学模型,研究其各层应力、应变随时间变化规律;对PSP样管进行蠕变试验研究表明:在恒定内压下,周向应变随时间变化缓慢,轴向应变随时间逐步增加,6000 min内应变增加较快,然后逐渐变缓,14000 min后轴向应变约增加了0.16%,理论结果与试验值吻合较好,证实了所建立的三层粘弹性模型可用来预测同类管材的蠕变特性。 相似文献
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H Fessler D C Fricker 《Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine》1989,203(1):15-34
Three-dimensional, frozen-stress photoelasticity was used to study the best shape for a proposed alumina universal head loaded on to a Vitallium cone taper spigot with a 30 degrees inclined force, as in vivo. Typical cone taper friction values were reproduced in the photoelastic models. The location of the highest tensile stresses in the Mark I shape with a flat crown was found to be on the inner surface of the crown. Changing to a torispherical surface in the Mark II shape reduced this magnitude. However, the Mark III shape with a hemispherical inner crown surface gave even lower stress there, equal to the maximum value of the hoop stress at the taper, which was measured to be fairly uniform both around and along the taper except at the ends where contact pressure concentrations were found to occur and it became reduced. Lamé axisymmetric cylinder stress predictions were found to be useful approximations to measured values and were generally overestimates of the tensile hoop stress at the head taper surface. 相似文献