共查询到20条相似文献,搜索用时 203 毫秒
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《机械工程与自动化》2020,(5)
针对新设计的发动机连杆,采用有限元仿真分析方法校核其强度及稳定性。通过对发动机连杆进行承载分析,并建立发动机连杆有限元模型,对发动机连杆及联接螺栓进行了强度分析,采用预应力模态分析方法对发动机连杆进行了模态分析,基于屈曲分析理论对发动机连杆进行了屈曲分析。分析结果表明:发动机连杆最大等效应力为500.28 MPa,安全系数为1.57,连杆联接螺栓最大等效应力为251.99 MPa,安全系数为2.54。证明了连杆及联接螺栓均满足强度设计要求;模态分析得到连杆与活塞联接处易发生振动失圆;发动机连杆一阶屈曲载荷系数为6.24,连杆的屈曲临界载荷为727 667.87 N,连杆设计满足屈曲稳定性要求。上述分析可为发动机连杆设计提供参考。 相似文献
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基于ANSYS的ITER重力支撑系统特征值屈曲分析 总被引:1,自引:0,他引:1
针对ITER重力支撑系统的结构特点,应用有限元软件ANSYS,建立了ITER重力支撑系统的有限元模型.采用Block Lanczos方法对ITER重力支撑系统在静载荷与地震载荷同时作用下的稳定性进行了特征值屈曲分析,求出了ITER重力支撑系统的前3阶屈曲特征值和特征值屈曲模态.结果表明ITER重力支撑系统不会发生屈曲,韧性板是整个支撑系统中最易发生屈曲的零件.屈曲分析的结果对ITER装置的设计与改进具有一定的指导意义. 相似文献
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利用三维设计软件SolidWorks对桥式起重机的桥架进行三维建模设计,并通过应用SolidWorks软件内部自带的有限元分析插件Simulation对所设计的桥架进行强度、刚度、模态及屈曲稳定性分析,评价其结构方案是否符合国家安全要求. 相似文献
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针对大型风力机运行中塔架常见的倾斜、中间凸出、焊缝开裂等故障,利用ANSYS有限元分析软件和工程算法对其结构进行了动力特性、屈曲分析和焊缝的分析。通过塔架模态分析可以优化塔架设计,避免风机在正常工作时塔架与风轮发生共振;屈曲和焊缝分析能够保证塔架的刚度和强度满足极限工况的负荷要求,从而为塔架的结构设计提供最佳参数依据。 相似文献
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The Tiber reinforced composite material is widely used in the multi-industrial field because of their high specific modulus
and specific strength. It has two main merits which are to cut down energy by reducing weight and to prevent explosive damage
proceeding to the sudden bursting which is generated by the pressure leakage condition. Therefore, Pressure vessels using
this composite material can be applied in the field such as defence industry and aerospace industry. In this paper, for nonlinear
finite element analysis of E-glass/epoxy filament winding of composite vessel subjected to internal pressure, the standard
interpretation model is developed by using the ANSYS with AutoLISP and ANSYS APDL languages, general commercial software,
which is verified as useful characteristic of the solution. Among the modules of the system, both the process planning module
for carrying out the process planning of filament wound composite pressure vessel and the autofrettage process module for
obtaining higher residual stress will minimize trial and error and reduce the period for developing new products. The system
can serve as a valuable system for experts and as a dependable training aid for beginners. 相似文献
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用有限单元法进行压力容器分析时,为了保证能得到合理精确度,在建模中有几个参数的选取必须注意,例如,网格划分时沿承压简体厚度的单元层数以及单元方向比等是如何影响计算精度的?采取参数化模型对上述问题进行系统分析,得到了一些对有限元建模有一定指导意义的结论。 相似文献
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高压釜是压力精炼的核心部件,基于有限元分析结果对一压力精炼用大型、复杂高压釜进行优化设计。首先以重量最小化为目标,建立高压釜优化设计的数学模型;然后应用前处理软件Hy-permesh和有限元软件Abaqus建立高压釜的三维有限元模型;其次基于力学知识和高压釜结构及承受载荷特点,构造优化算法,并应用构造的优化算法对高压釜进行优化设计;最后依据JB4732—1995《钢制压力容器——分析设计标准》中的应力限制对优化设计获得的高压釜进行安全评定。评定结果表明设计的高压釜能够满足安全需要。 相似文献
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变径管内高压成形有限元模拟 总被引:8,自引:0,他引:8
变径管是航空、汽车工业领域常用零件,用来输送压力油、冷却等。通过建立相应的内高压成形有限元模拟模型,用M SC.M arc有限元分析软件进行模拟分析,研究了变径管成形过程的基本变形特征、成形参数的影响规律。模拟分析得知适当地提高变形速率、减少减薄区变形持续时间有缓解该处过度减薄的作用,轴向进给应在减薄前进行补料,而不应在变形的同时补充所需金属。 相似文献
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史俊友 《机械工程与自动化》2006,(4):4-7
针对企业已有产品资源重用和对具体的工序设计支持较弱的现状,从信息集成、产品资源重用和系统应具备的功能出发,对PDM平台数据模型进行了分析;以SolidWorks为设计环境,对系统的体系结构、主要功能和工艺设计的思路、流程进行了分析和论述。 相似文献
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Xin Feng Wu Yong Jun Lei Dao Kui Li Yan Xie 《Journal of Mechanical Science and Technology》2013,27(5):1245-1253
An approach to establish the transfer function of complex aerospace structures to express their structural vibration behavior through finite element modeling is proposed. The fundamental idea of the approach is to characterize the vibrations of complicated structures through the transfer function model for an advanced control system design, while the parameters of the model are identified from the response data obtained through finite element analysis. The proposed method comprises four steps, namely, finite element modeling and validation, data preparation based on the finite element analysis, parameter identification of the transfer function, and model validation, and is presented from both frequency and time domains. The developed approach is applied to a cantilever beam, a strap-on launch vehicle, and a local part of the aerospace structure to demonstrate the method’s effectiveness and satisfactory performance. 相似文献
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建立了高压容器筒体与封头结构的有限元分析模型.采用蒙特卡罗法(Monte-Carlo Method),分析了输入随机变量对高压容器筒体与封头结构可靠性的影响.结果表明:工作压力对筒体与封头连接区可靠性的影响较大,是高压力容器筒体与封头结构失效的主要因素. 相似文献
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采用有限元方法,建立了斜接管压力容器结构在内压作用下的数值模型,并将不同载荷下管道的热点应力分布与现有文献实验结果进行了比较,两者吻合较好,验证了该计算方法的可靠性。对于正交接管利用两倍弹性斜率、切线交点和零曲率极限载荷准则获得斜接管道失效的极限内压;并将正交接管的极限内压与Cloud以最大有效应力达到屈服时对应的理论上极限内压值进行比较,结果表明:两倍弹性斜率与切线交点极限载荷准则在预测极限内压时偏于保守,零曲率准则对确定斜接管压力容器的极限载荷比较恰当。然后利用零曲率准则确定斜接管压力容器的极限载荷,采用控制单变量变化的方法,分别分析了接管中心线与简体中心的夹角、接管与筒体直径之比和筒体厚度与直径之比对极限载荷的影响,最后综合考虑这些因素的影响,得出了斜接管压力容器极限载荷的近似计算式。提供的分析方法为压力容器的设计及安全性评定提供了一种新途径。 相似文献
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Seung-Kee Koh 《Journal of Mechanical Science and Technology》1993,7(3):194-202
Residual stress analysis of an autofrettaged thick-walled pressure vessel containing an external groove was described in order
to calculate the stress concentration at the external groove. The autofrettage residual stress distributions of the external
grooved thick-walled pressure vessel were simulated using an equivalent thermal loading from the analogy of thermal and autofrettage
residual stress fields. Thermal stresses due to the simulated thermal loadings for various degrees of autofrettage overstrain
level were computed using finite element methods. Very high stress concentration factors due to autofrettage loadings were
obtained at the external groove root that contained a sharp root radius. Experimental measurement of residual stresses for
a fully autofrettaged smooth thick-walled pressure vessel using an equivalent saw cut method resulted in very close agreement
with the theoretical autofrettage residual stress distributions. The stress analysis results implied that the autofrettage
residual stress concentration might cause a cracking problem at the external groove root of the thick-walled pressure vessel,
indicating that lower autofrettage overstrain and a groove geometry change were desirable for enhanced durability. 相似文献