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基于流固耦合的弯管应力有限元分析 总被引:1,自引:0,他引:1
弯管在流体作用下受力复杂,准确的应力分析是进行强度计算和弯管设计的重要前提.本文使用ANSYS流体-固体有限元分析软件,建立了管内流体动力学分析和弯管结构应力三维分析模型,利用两种不同物理环境的转换,得出了弯管在流体不均匀压力作用下的应力分布. 相似文献
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泥浆泵剪切阀出口直角弯管在流体作用下受力复杂,准确地研究直角弯管内流体的流场以及分析弯管的应力和疲劳强度,对弯管结构可靠性分析和寿命分析起到非常重要的作用.运用软件FLUENT和ANSYS,采用物理环境顺序耦合法进行流固耦合数值模拟,得出了弯管内的流场分布以及弯管在不均匀压力下的应力分布和疲劳寿命规律.该方法对钻井现场施工的安全评估具有重要的意义. 相似文献
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基于有限元的弯管应力分析研究 总被引:1,自引:0,他引:1
本文利用大型有限元分析软件ANSYS对内压作用下的弯管的应力进行了分析,实现了弯管应力有限元法分析方法.同时详细研究了弯管加工缺陷对弯管应力的影响,进一步验证了理论分析的准确性. 相似文献
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应用ANSYS软件对受内压作用下的大型厚壁弯管进行了应力计算和分析,从而得到该弯管模型的应力分布规律,并结合相应的试验数据进行对比分析,验证了有限元分析结果的可靠性。 相似文献
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基于超声波检测原理,重点介绍利用改进的超声波探头对小径弯管进行探伤。利用超声波检测仪器对小径弯管进行了测试,通过分析计算,改进了超声波探伤小径弯管的工艺,并通过实验对工艺的准确性进行验证。 相似文献
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用直接法求解半圆形输液曲管的极限流速 总被引:1,自引:0,他引:1
根据D.Alembert原理导出了半圆形输液曲管弯曲-扭转-流体耦合问题的自由振动方程。对这类方程解耦而单独求出弯曲、扭转的解析解非常困难,于是介绍了一种近似计算方法--直接法。采用直接法,首先选取满足自然边界条件但不一定满足方程的试函数作为方程的近似解,并使误差在整个空间上加权累积为零,这可解释为广义力在虚位移上所做的虚功之和为零(平衡方程的弱积分)。而后求出了系统固有频率的近似解析公式,同时也得到了极限流速的近似解析公式。通过算例,分析了曲管中流体流速对系统固有频率的影响,得出了更为精确的结果。 相似文献
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柔性钻杆已成为老井改造和增产提效的重要工具,为保障柔性钻杆球面密封的可靠性,对设计的一种O形圈球面密封结构开展数值模拟和试验研究。基于ANSYS有限元分析软件探究密封间隙、流体压力、转动角度以及有无挡环等因素对O形圈von Mises应力、接触应力、有效密封宽度等密封特性参数的影响。结果表明:流体压力与密封间隙存在耦合关系,流体压力越高要求密封间隙越小;往复转动会导致最大von Mises应力和最大接触应力升高,且随着密封间隙增大而影响加剧;挡环的安装可有效防止在密封间隙和流体压力较大时O形圈挤入缝隙。通过室内试验验证了O形圈球面密封结构的可靠性,为现场应用提供了理论依据和技术支撑。 相似文献
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Coriolis mass flow meter (CFM) is used to measure the rate of mass flow through a pipe conveying fluid. In the present work, the Coriolis effect produced in the pipe due to a lateral excitation is modeled using the finite element (FE) method in MATLAB©. The coupled equation of motion for the fluid and pipe is converted to FE equations by applying Galerkin technique. The pipe conveying fluid is excited at its fundamental natural frequency. The time lag observed between symmetrically located measurement points which are equidistant from the point of excitation, is utilized to predict the mass flow rate. The results predicted by the present code is validated using the experimental, and numerical results published in the literature. The main contribution is the development of a FE model, using three node Timoshenko beam element to analyse the dynamics of fluid conveying pipes subjected to external excitation. The direction of the Coriolis force is perpendicular to the plane containing the velocity of flow vector and angular velocity vector of the pipe. Hence a three dimensional FE model is essential. This model can include curved geometry, damping, velocity and gyroscopic effects for three dimensional flexible tubes. The reduced integration used for overcoming shear locking in two node elements, will result in the formation of spurious modes leading to an incorrect prediction of natural frequencies and velocity. These modes will not occur while using three node elements. Influence of spatial as well as temporal discretisation on the time lag and frequency are also discussed. The sensitivity analysis shows that the time lag varies linearly with the mass flow rate. 相似文献
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为了描述管道除锈机驱动单元的弯管通过性,建立了管道除锈机在弯管处的运动方程与平衡方程,分析了其差速特性与力学特性,得到了驱动单元能够根据环境拓扑约束自主差速,驱动轮能够提供足够的拖动力,具有良好的机械自适应特性。并且驱动单元在通过弯管的各个阶段,各行走轮运动协调,无寄生功率产生,驱动效率高。 相似文献
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Young Joo Kwon 《Journal of Mechanical Science and Technology》2010,24(2):461-469
This paper presents a numerical analysis for the structural strength comparison of the St. Jude Medical bileaflet mechanical heart valve prosthesis with flat leaflet and the Edwards MIRA bileaflet mechanical heart valve prosthesis with curved leaflet. Computer aided engineering systems are used in the analysis. The blood fluid pressure is applied to both flat and curved leaflets of the bileaflet mechanical heart valve prostheses for the rigid body dynamic analysis to confirm the almost same dynamic characteristics of both flat and curved leaflet motions. Thereafter, using the same blood fluid pressure and dynamic characteristics of leaflet motions, structural mechanic analyses for both flat and curved leaflets of the mechanical heart valve prostheses are carried out to show quite different stress and deformation results, respectively. Conclusively, from the viewpoint of stress, it is revealed that the St. Jude Medical bileaflet mechanical heart valve prosthesis is structurally stronger and better than the Edwards MIRA bileaflet mechanical heart valve prosthesis. Computer aided engineering systems used in this comparative structural analysis are ADAMS for the rigid body dynamic analysis, and NISA for the structural mechanic analysis. 相似文献
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Dong -Myung Lee Myung -Jin Choi Taek -Yul Oh 《Journal of Mechanical Science and Technology》1996,10(2):180-189
For three dimensional vibration analysis of piping system containing fluid flow, a transfer matrix formulation is presented. The fluid velocity and pressure were considered, that coupled to longitudinal and flexural vibrations. Transfer matrices were derived from direct solutions of the differential equations of motion of pipe conveying fluids, and the variations of natural frequency with flow velocities for straight and curved pipes were investigated. The results were confirmed to the corrections of known data. The scheme of this study can be easily applied to the related fields, using small size personal computers with core memory about 200kbytes. 相似文献