共查询到17条相似文献,搜索用时 187 毫秒
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液-固挤压复合材料工艺仿真平台设计与实现 总被引:2,自引:0,他引:2
针对液-固挤压复合材料成形工艺研究过程中存在操作难度大、各工具软件间的兼容性不强等问题,设计了液-固挤压工艺仿真平台,并采用VC 作为开发工具,利用界面接口技术使仿真平台与ANSYS和Matlab软件实现无缝接合,对该工艺研究过程所用到的系统建模、参数预测、系统仿真模拟和数据采集等功能模块进行封装集成,建立了完整的液-固挤压复合材料工艺仿真平台. 相似文献
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建立广义动态模糊神经网络模型,用来预测焊接接头力学性能. 模型结构不再是建模时预设,而是在对逐个样本的学习过程中动态自适应调整. 引入椭圆基函数扩大函数的接收域,利用系统误差和模糊规则ε完备性作为模糊规则增加的依据,并将模糊规则ε完备性作为径向基单元的宽度确定准则. 以误差减少率评价模糊规则的重要性,并以此为依据对模型的模糊规则进行修剪. 采用三种不同厚度、不同工艺TC4钛合金TIG焊接试验,获得17组训练样本和5组仿真样本数据,建模并仿真. 结果表明,该模型能够对焊接接头力学性能进行较为准确的预测. 相似文献
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液-固挤压复合材料工艺参数的优化设计 总被引:2,自引:0,他引:2
提出了一种适宜于液-固挤压复合材料工艺系统的多目标优化模型.通过合理决策过程,将多目标转化为单目标优化进行求解.在对编码规则、初始种群的产生、目标函数向适配值的转换以及种群数量、交叉概率、变异概率选择等问题进行深入研究的基础上,建立了基于遗传算法的液-固挤压复合材料优化系统.理论及实验研究表明可以获得较好的优化增益.采用优化设计参数进行实验,成形出质量良好的复合材料制件,且实现了变形力小、浸渗时间较短和浇注温度较低的预期目标,为该工艺的实际应用奠定了基础. 相似文献
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为改善液固挤压复合材料成形过程中金属的流动均匀性,减少制件的内部损伤缺陷,基于人工神经网络及遗传算法,采用改进的混合GA-BP算法建立了设计参数与控制目标的非线性映射关系。通过对样本集的学习,初步建立了液固挤压工艺组合参数知识库,将网络预测值与实验值进行对比,其最大相对误差不超过0.79%,说明采用GA-BP混合算法建立的预测模型具有较高的预测精度。利用所建立的预测模型,分析了模具参数和工艺参数组合对制件变形均匀性的耦合作用,为液固挤压工艺的综合设计与优化提供了理论依据。 相似文献
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采用理论分析与试验研究相结合的方法,研究了液固挤压复合材料工艺过程的模具温度场,得到了模具温度沿径向和纵向随时间变化的曲线,分析了模具温度变化规律及其对成形过程的影响,模拟结果与试验结果吻合较好,说明所建模型的有效性,为优化模具设计和液-固挤压复合材料工艺的实际应用奠定了基础. 相似文献
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将模糊神经网络用于冲天炉铁液质量预测,构造了一个5层前馈网络,利用27组实验数据对网络进行训练,并对4组未知样本进行预测.结果表明,与目前所用热分析法相比,该网络模型在处理铁液质量这类在一定程度上具有不确定性的多变量非线性对象方面,能够消除建立模型时人为限定,提高预测精度;有效处理模糊信息,而且具有较强的学习能力,适应能力和泛化能力. 相似文献
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Mashy state extrusion, a new metal forming process, is proposed and investigated. In the process, mashy billets, including
solid and liquid components, are extruded into bars, wires, and tubes. The process is applied not only to aluminum alloys
and copper alloys, but also to metal-ceramic composites. Through the study, the extrusion conditions necessary to manufacture
sound products and mechanical properties of extruded bars, wires, and tubes are investigated. It is found that the extrusion
force or pressure for mashy state extrusion is distinctively lower than that for the conventional hot extrusion; therefore,
a high extrusion ratio is easily attainable. The mechanical properties of products and their internal structures are satisfactory
when the appropriate solid fraction of billet, reduction in area, and cooling conditions at die are employed. Through the
investigation, it becomes clear that mashy state extrusion is a metal forming process with very good potential and is effective
to manufacture various metal-metal and metal-ceramic composite products. 相似文献
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Research on the neural networks used for shaping tubes by the liquid extrusion process 总被引:7,自引:0,他引:7
Le-Hua Qi He-Jun Li Jun-Jie Hou Pei-Ling Cui 《Journal of Materials Engineering and Performance》2000,9(1):28-32
Liquid extrusion, as a new kind of metal forming process for shaping tube and bar products directly from liquid metal, can
reduce the intermediate steps and production costs and make the materials doubly strengthened. But it has not been widely
used since the process parameters are now selected by experience, which can easily result in a high reject rate. In order
to analyze the contributing factors of the process, the artificial neural network method was used in this paper. The network
architecture was determined by adopting 125 sets of experimental data of the shaping tubes of AlCuSiMg alloy as samples and,
by contrast, one or two hidden layers and the numbers of nodes and other network parameters. The knowledge base for the process
parameters of liquid extrusion has been established. The values predicted by the knowledge base are very consistent with the
practical ones. The result shows that the introduced method is feasible and effective. 相似文献
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M. Shiraishi M. Nikawa Y. Goto 《International Journal of Machine Tools and Manufacture》2003,43(15):1571-1578
The extrusion process through a die aperture inclined at a fixed angle, previously proposed by the authors, is applied to forming of rectangular bars and tubes with various cross-sectional shapes, and the fundamental properties of the process are investigated. The curvature of the extruded bar is found to decrease as the height and width of the die aperture increase. The curvatures of the extruded tubes agree fairly well with those of the solid bars, and further, close correlations are found between the curvatures of the rectangular and H-type bars, and between those of the rectangular and H-type tubes. The curvatures of the rectangular bars and tubes with flanges can be predicted by combining the fundamental bending properties of the process obtained in extrusion of the rectangular bars with the shape effect of the bars and tubes. 相似文献
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