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基于高阶复合曲面单元的非均匀大薄板装配偏差计算模型 被引量:1
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作者 林张鹏 余海东 袁可 《上海交通大学学报》 EI CAS CSCD 北大核心 2022年第5期584-593,共10页
结构的刚度非均匀分布易导致非规则大型薄壁在加工和装配过程中产生翘曲大变形,其结构建模和变形精确计算是装配偏差预测及控制的关键.基于绝对节点坐标法,引入高阶斜率坐标并改进单元插值函数,考虑单元接触界面间连续性,构建一种非规... 结构的刚度非均匀分布易导致非规则大型薄壁在加工和装配过程中产生翘曲大变形,其结构建模和变形精确计算是装配偏差预测及控制的关键.基于绝对节点坐标法,引入高阶斜率坐标并改进单元插值函数,考虑单元接触界面间连续性,构建一种非规则高阶曲面复合单元模型;采用该非规则高阶曲面单元建立复合单元组合离散非规则曲面结构,解决不同厚度单元间节点连接和变形耦合问题,并有效地描述非规则大型薄壁结构的大变形,基于连续介质力学建立非规则大型薄壁结构装配协调变形计算模型.对重型火箭贮箱箱底边缘区域加厚的超大型非规则薄壁结构进行装配过程变形计算,研究加厚区域尺寸与瓜瓣装配偏差以及结构刚度之间的关联关系,为未来重型火箭箱底超大非规则曲面结构设计提供指导. 展开更多
关键词 非规则薄壁结构 绝对节点坐标法 复合单元 装配偏差 协调变形
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Dynamic Analysis and Optimal Parameter Design of FlexibleComposite Structures via Absolute Nodal Coordinate Formulation 被引量:1
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作者 杨丹 余海东 林张鹏 《Journal of Shanghai Jiaotong university(Science)》 EI 2023年第5期621-629,共9页
The composite structure with the dielectric elastomer and soft materials is the main form of theactuators in soft robots. However, the theoretical model is hard to obtain due to the nonlinear large deformationof mater... The composite structure with the dielectric elastomer and soft materials is the main form of theactuators in soft robots. However, the theoretical model is hard to obtain due to the nonlinear large deformationof materials. In this paper, a new composite element model is established based on the absolute nodal coordinateformulation. The consistent deformation conditions at the contact interface between two thin plates are deduced.The hyperelastic constitutive model and the dielectric elastomer constitutive model are introduced for the twothin plates. Then the dynamic model is established to study the dynamic behaviors of the composite flexiblestructure with various parameters. The results show that the nonlinear deformation appears obviously whenthe flexible composite plate structure is driven by various voltages, and the warping deformation becomes moreobvious with the increase of the voltage. The width and thickness of the driven thin plate influence the stabilityof the whole structure. With the decrease of the width or thickness, the deformation of the structure is moreconsistent with obvious periodicity, and the control performance is improved. Finally, the structural parametersof the composite structures are optimized to improve the control performance based on the dynamic performance.Additionally, smaller width and thickness parameters are preferred to obtain better performance in the design offlexible actuator of soft robot. 展开更多
关键词 flexible composite structure absolute nodal coordinate formulation dynamic behavior deformation compatibility optimal design
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