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Parametric Tool for Static and Dynamic Analysis of Wind Turbine Tower Using Finite Element Method

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Journal of Energy and Power Engineering 2014年第10期8卷 1756-1762页

作者： Tiago Freires Silvia Caroline Raimundo Aprigio menezes Jr moises Salvino Alternative and Renewable Energy Department of Renewable Energy Engineering Center Federal University of Paraiba Jo6oPessoa 58051-900 Brazil Laboratory of Numerical Methods Distributed Processing Department of Renewable Energy Engineering Federal University ofParaiba Jo6o Pessoa 58051-900 Brazil

This work deals with a description of a parametric tool for elastic analysis of wind turbine tower, incorporating all analysis steps （preprocessing, processing and post-processing）. The tower geometry is approximated by fiat elements in which the membrane effects are evaluated using the FF （free formulation） finite element and the flexure effects are calculated using DKT （discrete shear triangle） finite element. The user-friendly system is implemented using OpenGL library to provide the graphical construction for geometry, mesh orientation, and other requirements of the finite element model. For the processing stage is built a specific dll library implemented in C＋＋ language for the analysis using the FF and DKT finite elements. The post-processing stage is build using specific dialogs box to present all results. The displacement results are visualized in the graphic interface to show the static and dynamic deformations of the tower. Some examples are presented to show all the tasks of the parametric tool.

关键词： Flat shell FEM (finite element method) wind turbine DKT FF.

Static Analysis of Eolic Blade through Finite Element Method and OOP C＋＋

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Journal of Energy and Power Engineering 2015年第1期9卷 108-116页

作者： Tiago Freires Silvia Caroline Raimundo menezes Jr moises Meneses Salvino Alternative and Renewable Energy Department of Renewable Energy Engineering Center Federal University of Paraiba Jo6o Pessoa 58051-900 Brazil Laboratory of Numerical Methods Distributed Processing Department of Renewable Energy Engineering Federal University of Paraiba Jo6o Pessoa 58051-900 Brazil Energy Efficiency Lab Hydraulics and Sanitation Federal University of Paraiba Joao Pessoa 58051-900 Brazil

This work deals with a description of an elastic analysis of eolic blade （preprocessing, processing and post-processing stages）. The eolic blade geometry is approximated by flat finite elements in which the membrane effects are evaluated using the FF （free formulation） finite element and the flexure effects are calculated using DKT （discrete shear triangle） finite element. The pre-processing stage is implemented using OpenGL library, to provide the graphical construction for geometry, mesh orientation, and other requirements of the finite element model. For the processing stage is built a specific dll （dynamic link library） library implemented in C＋＋ language for the FF and DKT elements analysis. The post-processing stage has been built using specific dialogs to present all results in the graphic interface, where the static displacements of the eolic blade model are shown.

关键词： Flat shell FEM (finite element method) DKT FF

Parametric Modeling of Static Three-Dimensional Problem of Buried Pipeline through the Coupling between a Finite Cylindrical Shell Element and Special Boundary Elements

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Journal of Civil Engineering and Architecture 2015年第6期9卷 701-714页

作者： Raimundo A. menezes Junior moises M. Salvino Carlos L. dos Santos Allan R. Albuquerque Jailson M.Ferreira Dawy Keyson Carlo R. lima Martin Alternative and Renewable Energy Center Federal University of Paraiba Joao Pessoa 58051-900 Brazil Technology Center Federal University of Paraiba Joao Pessoa 58051-900 Brazil Federal Institute of Education Science and Technology of Paraiba Joao Pessoa 58051-900 Brazil Education Center Federal University of Paraiba Joao Pessoa 58051-900 Brazil

This work deals with an application in parametric modeling of problems regarding pipelines buried in static system, written in C＋＋ using ObjectARX functions. The application is fully integrated with AutoCAD through *** and *** libraries where the stages of pre-processing, processing and post-processing are done in AutoCAD sotlware environment itself without having to export data to another processing environment. The analysis processing is done by functions whose algorithms are based on the solution of the coupling between the FEM （finite element method） and the BEM （boundary element method）. The representation of the homogeneous pipeline is made by the FEM using a finite element in the form of a cylindrical panel called CYS （cylindrical shell）, developed from the homogeneous isotropic model proposed initially by Djoudi Bahai, who uses the philosophy of the assumed deformation model （assumed strain based model）. The soil is taken to be a continuum infinite or semi-infinite elastic solid patterned by BEM where special boundary elements are proposed with curved surface or curved edges to represent the soil-structure interaction mainly in the areas of contact with the pipeline.

关键词： Finite elements boundary elements AutoCAD

渗透树脂治疗釉质白垩斑即时遮盖效果的临床评价

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中国口腔医学继续教育杂志 2020年第6期23卷 354-359页

作者： Rosa Maria Pereira moises Andrade Tayllan Oliveira lima Maria Angelica menezes-Oliveira Ruchele Nogueira Cesar Penazzo Lepri Vinicius Geraldo-Martins 许梦茹(译) 张珊珊郑树国(审) 不详北京大学口腔医院预防科 100081

本研究的目的是在体内评价渗透树脂(IR)治疗釉质白垩斑(WSLs)的即时遮盖效果。研究对象为40名11~23岁的青少年和年轻成人.至少有一颗上颌或下颌恒前牙为活动性白垩斑(ICDAS得分为2分)。在渗透树脂治疗前.使用数字分光光度计(CIElab)对... 详细信息

本研究的目的是在体内评价渗透树脂(IR)治疗釉质白垩斑(WSLs)的即时遮盖效果。研究对象为40名11~23岁的青少年和年轻成人.至少有一颗上颌或下颌恒前牙为活动性白垩斑(ICDAS得分为2分)。在渗透树脂治疗前.使用数字分光光度计(CIElab)对白垩斑和相邻完整釉质(SAE)的颜色进行评估。接着.依据生产商的使用说明对白垩斑应用渗透树脂技术(Icon).临床操作结束时评估渗透树脂的颜色。计算白垩斑和相邻完整釉质(WSL×SAE)、白垩斑和渗透树脂(WSL×IR)以及渗透树脂和相邻完整釉质(IR×SAE)间的颜色差异(△E),然后用单因素方差分析和Turkey’s检验进行分析。用t检验来比较相关样本白垩斑.相邻完整釉质和渗透树脂的L^*、a^*、b^*值(α=5%)。白垩斑和渗透树脂(WSL×IR)比较时△E=5.930.41.渗透树脂和相邻完整釉质间(IR×SAE)的△E=5.770.41.说明治疗后白垩斑的颜色发生改变.但与相邻完整釉质相比.渗透树脂不能完全掩饰白垩斑。相邻完整釉质的明度比渗透树脂高。由此可以得出如下结论:与相邻完整釉质相比.渗透树脂治疗不能遮盖白垩斑的颜色.但可以减弱釉质脱矿引起的变色。

关键词：渗透树脂白垩斑釉质脱矿临床操作单因素方差分析恒前牙颜色差异分光光度计