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US-FE-LSPIM四边形单元的自由振动研究 被引量:2

The Free Vibration Analysis of US-FE-LSPIM QUAD4 Element
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摘要 为了提高在网格变形时的数值计算精度,基于非对称有限单元的概念,提出US-FE-LSPIM四边形单元.该单元是利用两种不同的形函数集合,即:传统的四节点等参形函数集和FE-LSPIM四边形单元形函数集分别作为检验函数和试函数构成.它能方便地施加整段长度的位移边界条件.通过研究该四边形单元在悬臂梁二维自由振动中的表现,表明该单元具有很高的计算精度;并且在变形网格下该单元结果优于QUAD4单元,对网格变形不敏感. In oder to improve precision of numerical calculation for distorted meshes,the US-FE-LSPIM QUAD4 element is developed based on the concept of unsymmetric finite element formulation.This element uses two different sets of shape functions for the trial and test functions,viz.sets of FE-LSPIM QUAD4 element shape functions and sets of classical isoparametric shape functions.The US-FE-LSPIM QUAD4 element could easily fulfil exact essential boundary condition along the entire length of the edge.The element is use...
出处 《郑州大学学报(工学版)》 CAS 北大核心 2009年第2期129-132,140,共5页 Journal of Zhengzhou University(Engineering Science)
基金 国家自然科学基金资助项目(50539030)
关键词 有限元-无网格 网格变形 振动性 形函数 四边形单元 FE-meshfree mesh distortion completeness compatibility
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