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板锥网壳结构是一种受力性能合理,技术经济效益良好的新型空间结构形式。本文对板锥网壳结构的设计与构造、施工与安装进行探讨,着重研究了复合材料层合板的设计计算,提出了种适用于板锥网壳结构的新型节点形式。 相似文献
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新型网壳结构的应用与发展 总被引:5,自引:0,他引:5
本文阐述了组合网壳结构,局部双层网壳结构,预应力网壳结构,斜拉网壳结构及索弯顶等种新型网壳结构的应用与发展,指出了这些新型网壳结构的受力特性和在设计,分析中应注重的若干要点。 相似文献
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本文介绍了进行网壳结构稳定分析程序Stab系统的编制原理及主要功能,并与有关文献提供了问题进行了对比,验证了程序的正确性。 相似文献
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板锥网壳结构是一种受力性能合理,技术经济效益良好的新型空间结构形式。本文采用组合结构有限元法对板锥网壳结构进行了线弹性静力分析,分别考虑了三种计算力学模型,着重研究了具有内节点的三角形板单元及复合材料层合板单元,编制了板锥网壳结构的专用计算程序。 相似文献
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空间网壳结构稳定问题研究进展及展望 总被引:2,自引:0,他引:2
本文总结和综述了稳定理论在空间网壳 的应用发展过程,介绍了网壳结构稳定问题的研究现状,研究方法和目前已取得的成果,对网壳结构分析中存在的问题提出了看法.。 相似文献
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Abstract Determining and modeling of the extent of a treatment process in a reactor require knowledge of the flow characteristics. Residence time distribution (RTD), hydrodynamic dispersion coefficients, and velocity distribution are three important terms. Velocity distribution can be measured by a laser doppler anemometer (LDA) accurately, but RTD and hydrodynamic dispersion coefficients must be analyzed by mathematical modeling and dye testing. In this paper, the mathematical modeling and numerical simulation of a upflow reactor are developed. Rhodamine B and a fluorometer are used in laboratory testing. By applying the Euler FTCS (forward‐time‐center‐space) finite‐difference method, the results of dye tests and convection‐dispersion models are compared. The relationship between hydro‐dynamic dispersion coefficients and flow rates is discussed. 相似文献
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从模块化建模的角度出发,针对在暖通空调系统中常见的单相流体网络,对一些关键部件进行合理假设、划分并建模,通过将网络节点抽象成小容积环节并建立容积模块,实现模块化建模。仿真结果表明,采用容积模块可以克服传统的迭代算法缺陷,大大减小在线计算量,高效实现动态仿真。 相似文献
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基于船用核动力一体化反应堆结构的需要,建立了新型船用气体稳压器启动充气过程的数学模型,并进行了仿真计算.计算结果表明,该模型能正确地描述该型稳压器实际的启动充气过程,满足工程设计及系统研究的需要. 相似文献
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热处理数学模型与计算机模拟 总被引:14,自引:0,他引:14
热处理计算机模拟是热处理智能化的基础。采用三维非线性有限元模型和界面条件突变的处理方法实现了几种复杂形状零件在复杂的淬火操作过程中温度场、相变、应力和应变的模拟,模拟结果与实测结果基本相符。将气体渗碳的计算机模拟与计算机控制技术相结合,研制成功智能型密封多用炉自动生产线,已处理渗碳件3 000炉次以上,全部合格。计算机模拟技术的应用明显提高渗碳和渗氮零件的承载能力和可靠性,减少热处理变形,缩短渗碳时间。建议将机械产品的CAD、选材与热处理的CAE和产品可靠性的动力评估技术相结合,进行高可靠而又无冗余的产品设计。 相似文献
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本文简述数学建模竞赛后续研究的深化与拓展的组织过程和收获,并结合实践认识到实施该研究的三个关键环节。 相似文献
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Sabing Lee S. M. Jeng J. -M. Yang 《Mechanics of materials : an international journal》1995,21(4):303-312
A theoretical model and computer simulation methodology was developed to predict the effect of fiber fracture on creep behavior of continuous fiber-reinforced metal matrix composites. Initially, a single fiber model was developed based upon the fiber statistical characteristics and a shear-lag analysis to establish the computation simulation route. Then, the methodology was extended to predict the creep behavior of a multiple fiber composite. A failure criterion was also incorporated in the model to predict the rupture life of the composite. A parametric study was also conducted to investigate the effects of properties of the constituents on the longitudinal creep behavior of the SCS-6/Ti composite. 相似文献
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加载在微软电子表格软件上的水晶球软件是一个易于使用的软件,它包括蒙特卡洛模拟(水晶球)、时间序列预测(水晶球预言家)、最优选择(优化查询)和用来构造定制界面和程序的开发工具箱。模拟方法建模和用计算机模拟检验数学模型的正确性正日益流行。加载了水晶球软件的电子表格可以方便地进行蒙特卡洛模拟,从而为计算机模拟的教学和应用提供了很好的手段。本文介绍了水晶球软件的主要功能和两个应用实例。 相似文献
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In this paper, the mechanical response of incompressible particle-reinforced neo-Hookean composites (IPRNC) under general finite deformations is investigated numerically. Three-dimensional Representative Volume Element (RVE) models containing 27 non-overlapping identical randomly distributed spheres are created to represent neo-Hookean composites consisting of incompressible neo-Hookean elastomeric spheres embedded within another incompressible neo-Hookean elastomeric matrix. Four types of finite deformation (i.e., uniaxial tension, uniaxial compression, simple shear and general biaxial deformation) are simulated using the finite element method (FEM) and the RVE models with periodic boundary condition (PBC) enforced. The simulation results show that the overall mechanical response of the IPRNC can be well-predicted by another simple incompressible neo-Hookean model up to the deformation the FEM simulation can reach. It is also shown that the effective shear modulus of the IPRNC can be well-predicted as a function of both particle volume fraction and particle/matrix stiffness ratio, using the classical linear elastic estimation within the limit of current FEM software. 相似文献