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Communications in Numerical Methods in Engineering最新文献

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A fast method for numerical simulation of casting solidification 一种快速铸造凝固数值模拟方法
Communications in Numerical Methods in Engineering Pub Date : 2007-10-29 DOI: 10.1002/CNM.1062
R. Tavakoli, P. Davami
{"title":"A fast method for numerical simulation of casting solidification","authors":"R. Tavakoli, P. Davami","doi":"10.1002/CNM.1062","DOIUrl":"https://doi.org/10.1002/CNM.1062","url":null,"abstract":"An efficient numerical method for simulation of casting solidification is presented. The presented method is based on a stable explicit finite difference solution of the heat equation in conjunction with the temperature recovery method to incorporate latent heat effect. The computational cost of the presented method is approximately the same as an explicit method (per time step), while it is free from the time step limitation due to the stability criterion. A simple domain decomposition method is included to improve the computational performance of the presented method. The efficiency, stability and accuracy of the presented method are supported with illustrative examples. Copyright © 2007 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1062","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51532913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
Boundary contour method fracture analysis of bimaterial interface cracks 双材料界面裂纹的边界轮廓法断裂分析
Communications in Numerical Methods in Engineering Pub Date : 2007-10-11 DOI: 10.1002/CNM.1060
A. Phan, S. Mukherjee
{"title":"Boundary contour method fracture analysis of bimaterial interface cracks","authors":"A. Phan, S. Mukherjee","doi":"10.1002/CNM.1060","DOIUrl":"https://doi.org/10.1002/CNM.1060","url":null,"abstract":"A variant of the boundary element method, called the boundary contour method (BCM), offers a further reduction in dimensionality. Consequently, boundary contour analysis of two-dimensional (2-D) problems does not require any numerical integration at all. The method is thus very computationally effective and accurate as shown in previous related studies. This paper presents a further development of the BCM for multi-region problems in 2-D elasticity, and an application of this development, coupled with the displacement correlation technique, to evaluating the stress intensity factors K1 and K2 for bimaterial interface cracks. Some preliminary tests conducted within this work suggest that the proposed technique is robust and able to provide highly accurate results of both K1 and K2 for this challenging class of fracture problems. Copyright © 2007 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1060","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51532858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Advantages of a semi-analytical approach for the analysis of an evolving structure with contacts 半解析法分析带接触的演化结构的优点
Communications in Numerical Methods in Engineering Pub Date : 2007-10-08 DOI: 10.1002/CNM.1059
V. Denoël
{"title":"Advantages of a semi-analytical approach for the analysis of an evolving structure with contacts","authors":"V. Denoël","doi":"10.1002/CNM.1059","DOIUrl":"https://doi.org/10.1002/CNM.1059","url":null,"abstract":"This paper presents a semi-analytical approach for the evolution analysis of a beam into given boundaries. The analytical description of contact locations, contact forces and beam deflections results in an exact modelling of the phenomenon (no penetration allowed). Despite the apparent complexity of the problem, the analytical relations leading to two-point boundary and integro-restrained differential equations are formally written. An iterative resolution of these equations is adopted by converting the problem into a single-point boundary value one. Due to a proper selection of the global unknowns, namely the contact forces and their locations, the proposed method is particularly efficient in the context of evolving structures. The resolution is illustrated on a simple example, and comparisons with the finite element method are given as persuasive arguments. Copyright © 2007 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1059","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51532833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 17
On the 'most normal' normal 关于“最正常”的正常
Communications in Numerical Methods in Engineering Pub Date : 2007-10-03 DOI: 10.1002/CNM.1056
R. Aubry, R. Löhner
{"title":"On the 'most normal' normal","authors":"R. Aubry, R. Löhner","doi":"10.1002/CNM.1056","DOIUrl":"https://doi.org/10.1002/CNM.1056","url":null,"abstract":"Given a set of normals in ℛ3, two algorithms are presented to compute the ‘most normal’ normal. The ‘most normal’ normal is the normal that minimizes the maximal angle with the given set of normals. A direct application is provided supposing a surface triangulation is available. The set of normals may represent either the face normals of the faces surrounding a point or the point normals of the points surrounding a point. The first algorithm is iterative and straightforward, and is inspired by the one proposed by Pirzadeh (AIAA Paper 94-0417, 1994). The second gives more insight into the complete problem as it provides the unique solution explicitly. It would correspond to the general extension of the algorithm presented by Kallinderis (AIAA-92-2721, 1992). Copyright © 2007 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1056","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51533093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 31
Parabolic recovery of boundary gradients 边界梯度的抛物线恢复
Communications in Numerical Methods in Engineering Pub Date : 2007-09-28 DOI: 10.1002/CNM.1054
R. Löhner, J. Cebral, Sunil Appanaboyina
{"title":"Parabolic recovery of boundary gradients","authors":"R. Löhner, J. Cebral, Sunil Appanaboyina","doi":"10.1002/CNM.1054","DOIUrl":"https://doi.org/10.1002/CNM.1054","url":null,"abstract":"A parabolic recovery procedure suited for shear stress and heat flux recovery on surfaces from linear element data is proposed. The information required consists of the usual unknowns at points, as well as gradients recovered at the points that are one layer away from the wall. The procedure has been in use for some time and has consistently delivered superior results as compared with the usual wall shear stress and heat flux obtained from linear finite element method shape functions. Copyright © 2007 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1054","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51533046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
A numerical approach for efficient and accurate modeling of spot-welding connection in automotive crash analysis 汽车碰撞分析中点焊连接高效准确建模的数值方法
Communications in Numerical Methods in Engineering Pub Date : 2007-09-28 DOI: 10.1002/CNM.1058
He Wen, Zhang Weigang, Zhong Zhi-hua
{"title":"A numerical approach for efficient and accurate modeling of spot-welding connection in automotive crash analysis","authors":"He Wen, Zhang Weigang, Zhong Zhi-hua","doi":"10.1002/CNM.1058","DOIUrl":"https://doi.org/10.1002/CNM.1058","url":null,"abstract":"Modeling of spot-welding connection is very important in automotive crash analysis, as spot welding is the main approach to assemble the automobile body from hundreds of press-formed components. Although alternative methods are available for modeling the spot welding, new methods are desirable for better efficiency and accuracy. In this paper, a new approach is proposed for the modeling in an explicit analysis environment. Virtual welding nodes are introduced and constructed from actual nodes of the associated finite element. Given constraints are then imposed on the welding nodes using the Lagrange approach. Good accuracy may be obtained while compatibility with the explicit approach is achieved and numerical stability is unaffected for general mesh layout. The approach is implemented in an explicit code and validated with numerical examples. Copyright © 2007 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1058","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51533281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An integrated parameter identification method combined with sensor placement design 结合传感器布置设计的综合参数辨识方法
Communications in Numerical Methods in Engineering Pub Date : 2007-09-19 DOI: 10.1002/CNM.1052
Yiqian Li, Z. Xiang, M. Zhou, Z. Cen
{"title":"An integrated parameter identification method combined with sensor placement design","authors":"Yiqian Li, Z. Xiang, M. Zhou, Z. Cen","doi":"10.1002/CNM.1052","DOIUrl":"https://doi.org/10.1002/CNM.1052","url":null,"abstract":"Material parameter identification based on in situ measurements plays a very important role in engineering. Since noises are inevitable in measurements and the parameter identification is inherently ill posed, it is necessary to consider some methods to stabilize the identification procedure. One choice is properly designing the sensor placement, which has attracted much attention over the past 30 years. Most existing sensor placement design methods are based on certain sensitivity analysis, which commonly requires evaluating Jacobian matrix for given parameters. However, the ‘true’ values of parameters are unknown at that moment, because sensor placement design is carried out before the parameter identification. Consequently, roughly estimated ‘true’ parameters have to be used and less optimal sensor placement could be obtained. To solve this problem, this paper presents an integrated method in which the parameter identification and sensor placement design are carried out alternatively. The validity of the proposed method is illustrated by two simple academic examples. Then it is implemented to detect damages in a real highway bridge. Copyright © 2007 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1052","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51532451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
High dimensional model representation for piece‐wise continuous function approximation 分段连续函数近似的高维模型表示
Communications in Numerical Methods in Engineering Pub Date : 2007-09-19 DOI: 10.1002/CNM.1053
R. Chowdhury, B. N. Rao, A. M. Prasad
{"title":"High dimensional model representation for piece‐wise continuous function approximation","authors":"R. Chowdhury, B. N. Rao, A. M. Prasad","doi":"10.1002/CNM.1053","DOIUrl":"https://doi.org/10.1002/CNM.1053","url":null,"abstract":"High dimensional model representation (HDMR) approximates multivariate functions in such a way that the component functions of the approximation are ordered starting from a constant and gradually approaching to multivariance as we proceed along the terms like first-order, second-order and so on. Until now HDMR applications include construction of a computational model directly from laboratory/field data, creating an efficient fully equivalent operational model to replace an existing time-consuming mathematical model, identification of key model variables, global uncertainty assessments, efficient quantitative risk assessments, etc. In this paper, the potential of HDMR for tackling univariate and multivariate piece-wise continuous functions is explored. Eight numerical examples are presented to illustrate the performance of HDMR for approximating a univariate or a multivariate piece-wise continuous function with an equivalent continuous function. Copyright © 2007 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1053","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51533014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 54
Charge distribution on narrow MEMS beams of nearly square cross-section 近方截面窄MEMS光束上的电荷分布
Communications in Numerical Methods in Engineering Pub Date : 2007-06-25 DOI: 10.1002/CNM.1021
Hui Chen, S. Mukherjee
{"title":"Charge distribution on narrow MEMS beams of nearly square cross-section","authors":"Hui Chen, S. Mukherjee","doi":"10.1002/CNM.1021","DOIUrl":"https://doi.org/10.1002/CNM.1021","url":null,"abstract":"The subject of this paper is the calculation of charge distribution on the surfaces of thin conducting microelectromechanical systems beams, of nearly square cross-section, in electrostatic problems, by the boundary element method (BEM). A line model of a beam is proposed here. This model overcomes the problem of dealing with nearly singular matrices that occur when the standard BEM is applied to very thin features (objects or gaps). This new approach is also very efficient. Numerical results are presented for selected examples. Copyright © 2007 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1021","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51531622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Parallel Delaunay triangulation for particle finite element methods 粒子有限元方法的平行Delaunay三角剖分
Communications in Numerical Methods in Engineering Pub Date : 2007-06-11 DOI: 10.1002/CNM.1007
Y. Fragakis, E. Oñate
{"title":"Parallel Delaunay triangulation for particle finite element methods","authors":"Y. Fragakis, E. Oñate","doi":"10.1002/CNM.1007","DOIUrl":"https://doi.org/10.1002/CNM.1007","url":null,"abstract":"Delaunay triangulation is a geometric problem that is relatively difficult to parallelize. Parallel algorithms are usually characterized by considerable interprocessor communication or important serialized parts. In this paper, we propose a method that achieves high speed-ups, but needs information regarding locally maximum element circumspheres prior to the beginning of the algorithm. Such information is directly available in iterative methods, like the particle finite element methods. The developed parallel Delaunay triangulation method, has minimum communication requirements, is quite simple and achieves high parallel efficiency. Copyright © 2007 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51531342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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