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Communications in Numerical Methods in Engineering最新文献

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An innovative prone positioning system for advanced deformity and frailty in complex spine surgery. 创新的俯卧定位系统，用于复杂脊柱手术中的晚期畸形和虚弱。
IF 2.9
Communications in Numerical Methods in Engineering Pub Date : 2019-10-25 Print Date: 2020-02-01 DOI: 10.3171/2019.7.SPINE19161
Benjamin Kolb, John Large, Stuart Watson, Glyn Smurthwaite
{"title":"An innovative prone positioning system for advanced deformity and frailty in complex spine surgery.","authors":"Benjamin Kolb, John Large, Stuart Watson, Glyn Smurthwaite","doi":"10.3171/2019.7.SPINE19161","DOIUrl":"10.3171/2019.7.SPINE19161","url":null,"abstract":"<p><p>The authors present a technical note for a prone positioning system developed to facilitate cervical extension osteotomy for ankylosing spondylitis in the presence of severe deformity and frailty. Chin-on-chest deformity represents one of the most debilitating changes of ankylosing spondylitis. Where the chin-brow angle approaches or exceeds 90°, prone positioning becomes problematic due to the fixed position of the head. Furthermore, the challenge is compounded where physiological deconditioning leads to frailty, and the side effects of medical therapies decrease muscle mass and skin quality. Conventional prone positioning equipment is not able to cater to all patients. A versatile system was developed using a 3D reconstruction to enable a positioning simulation and verification tool. The tool was used to comprehensively plan the perioperative episode, including spatial orientation and associated equipment. Three-dimensional printing was used to manufacture a bespoke positioning device that precisely matched the contours of the patient, reducing contact pressure and risk of skin injury. The authors were able to safely facilitate surgery for a patient whose deformity and frailty may otherwise have precluded this possibility. The system has potential safety and economic implications that may be of significant utility to other institutions engaging in complex spinal surgery.</p>","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":"18 1","pages":"229-234"},"PeriodicalIF":2.9,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73207447","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
Optimization of anastomotic configuration in CABG surgery 冠脉搭桥手术吻合口构型的优化
Communications in Numerical Methods in Engineering Pub Date : 2009-11-01 DOI: 10.1007/978-3-540-79039-6_29
Y. Sui, Baosheng Ma, B. Chu, A. Qiao
{"title":"Optimization of anastomotic configuration in CABG surgery","authors":"Y. Sui, Baosheng Ma, B. Chu, A. Qiao","doi":"10.1007/978-3-540-79039-6_29","DOIUrl":"https://doi.org/10.1007/978-3-540-79039-6_29","url":null,"abstract":"","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":"1 1","pages":"1097-1106"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51065389","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: 6
Comparative study between two numerical methods for oxygen diffusion problem 氧扩散问题两种数值方法的比较研究
Communications in Numerical Methods in Engineering Pub Date : 2009-08-01 DOI: 10.1002/CNM.1127
Vildan Gülkaç
{"title":"Comparative study between two numerical methods for oxygen diffusion problem","authors":"Vildan Gülkaç","doi":"10.1002/CNM.1127","DOIUrl":"https://doi.org/10.1002/CNM.1127","url":null,"abstract":"Two approximate numerical solutions of the oxygen diffusion problem are defined using three time-level of Crank–Nicolson equation and Gauss–Seidel iteration for three time-level of implicit method. \u0000 \u0000 \u0000 \u0000Oxygen diffusion in a sike cell with simultaneous absorption is an important problem and has a wide range of medical applications. The problem is mathematically formulated through two different stages. At the first stage, the stable case having no oxygen transition in the isolated cell is searched, whereas at the second stage the moving boundary problem of oxygen absorbed by the tissues in the cell is searched. The results obtained by three time-level of implicit method and Gauss–Seidel iteration for three time-level of implicit method and the results gave a good agreement with the previous methods (J. Inst. Appl. Math. 1972; 10:19–33; 1974; 13:385–398; 1978; 22:467–477). Copyright © 2008 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":"40 1","pages":"855-863"},"PeriodicalIF":0.0,"publicationDate":"2009-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1127","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51536912","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: 9
Optimal stress recovery points for higher-order bar elements by Prathap's best-fit method 用Prathap最佳拟合方法求高阶杆件的最优应力恢复点
Communications in Numerical Methods in Engineering Pub Date : 2009-08-01 DOI: 10.1002/CNM.1129
S. Rajendran
{"title":"Optimal stress recovery points for higher-order bar elements by Prathap's best-fit method","authors":"S. Rajendran","doi":"10.1002/CNM.1129","DOIUrl":"https://doi.org/10.1002/CNM.1129","url":null,"abstract":"Barlow was the first to propose a method to predict optimal stress recovery points in finite elements (FEs). Prathap proposed an alternative method that is based on the variational principle. The optimal points predicted by Prathap, called Prathap points in this paper, have been reported in the literature for linear, quadratic and cubic elements. Prathap points turn out to be the same as Barlow points for linear and quadratic bar elements but different for cubic bar element. Nevertheless, for all the three elements, Prathap points coincide with the reduced Gaussian integration points. In this paper, an alternative implementation of Prathap's best-fit method is used to compute Prathap points for higher-order (viz., 4–10th order) bar elements. The effectiveness of Prathap points as points of accurate stress recovery is verified by actual FE analysis for typical bar problems. Copyright © 2008 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":"32 1","pages":"864-881"},"PeriodicalIF":0.0,"publicationDate":"2009-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1129","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51536941","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
Free vibration and bending analysis of circular Mindlin plates using singular convolution method 用奇异卷积法分析圆形Mindlin板的自由振动和弯曲
Communications in Numerical Methods in Engineering Pub Date : 2009-08-01 DOI: 10.1002/CNM.1138
Ö. Civalek, H. Ersoy
{"title":"Free vibration and bending analysis of circular Mindlin plates using singular convolution method","authors":"Ö. Civalek, H. Ersoy","doi":"10.1002/CNM.1138","DOIUrl":"https://doi.org/10.1002/CNM.1138","url":null,"abstract":"Circular plates are important structural elements in modern engineering structures. In this paper a computationally efficient and accurate numerical model is presented for the study of free vibration and bending behavior of thick circular plates based on Mindlin plate theory. The approach developed is based on the discrete singular convolution method and the use of regularized Shannon's delta kernel. Frequency parameters, deflections and bending moments are obtained for different geometric parameters of the circular plate. Comparisons are made with existing numerical and analytical solutions in the literature. It is found that the DSC method yields accurate results for the free vibration and bending problems of thick circular plates. Copyright © 2008 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":"1 1","pages":"907-922"},"PeriodicalIF":0.0,"publicationDate":"2009-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1138","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51537317","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: 21
A stabilized smoothed finite element method for free vibration analysis of Mindlin–Reissner plates Mindlin-Reissner板自由振动分析的稳定光滑有限元法
Communications in Numerical Methods in Engineering Pub Date : 2009-08-01 DOI: 10.1002/CNM.1137
H. Nguyen-Xuan, T. Nguyen-Thoi
{"title":"A stabilized smoothed finite element method for free vibration analysis of Mindlin–Reissner plates","authors":"H. Nguyen-Xuan, T. Nguyen-Thoi","doi":"10.1002/CNM.1137","DOIUrl":"https://doi.org/10.1002/CNM.1137","url":null,"abstract":"A free vibration analysis of Mindlin–Reissner plates using the stabilized smoothed finite element method is studied. The bending strains of the MITC4 and STAB elements are incorporated with a cell-wise smoothing operation to give new proposed elements, the mixed interpolation and smoothed curvatures (MISCk) and SMISCk elements. The corresponding bending stiffness matrix is computed along the boundaries of the smoothing elements (smoothing cells). Note that shearing strains and the shearing stiffness matrix of the proposed elements are unchanged from the original elements, the MITC4 and STAB elements. It is confirmed by numerical tests that the present method is free of shear locking and has the marginal improvements compared with the original elements. Copyright © 2008 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":"25 1","pages":"882-906"},"PeriodicalIF":0.0,"publicationDate":"2009-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1137","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51537227","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: 78
Call for Papers: ‘Fluid-Structure Interaction in Biomedical Applications’ 论文征集:“流体-结构相互作用在生物医学应用中的应用”
Communications in Numerical Methods in Engineering Pub Date : 2008-12-10 DOI: 10.1002/cnm.1151
R. Loon, F. Vosse
{"title":"Call for Papers: ‘Fluid-Structure Interaction in Biomedical Applications’","authors":"R. Loon, F. Vosse","doi":"10.1002/cnm.1151","DOIUrl":"https://doi.org/10.1002/cnm.1151","url":null,"abstract":"","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2008-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51538699","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
Non‐stationary plane problem of the successive origination of stress concentrators in a loaded body. Finite deformations and their superposition 承载体应力集中点连续起源的非定常平面问题。有限变形及其叠加
Communications in Numerical Methods in Engineering Pub Date : 2008-12-01 DOI: 10.1002/CNM.1092
V. Levin, A. Vershinin
{"title":"Non‐stationary plane problem of the successive origination of stress concentrators in a loaded body. Finite deformations and their superposition","authors":"V. Levin, A. Vershinin","doi":"10.1002/CNM.1092","DOIUrl":"https://doi.org/10.1002/CNM.1092","url":null,"abstract":"The first (for the given class of problems) results of solving non-stationary plane problems of non-simultaneous origination of holes and inclusions in a preliminary loaded solid with initial finite strains are presented and discussed. It is taken into account that the origination of a hole or an inclusion produces additional finite deformations (at least, at the vicinity of the hole) superimposed 'physically' on the finite initial ones. The problem is solved using the theory of repeated superposition of large deformations. It is supposed that the shape of stress concentrators is given at the moment of their origination. Calculations were made with the use of the specialized computer package 'Superposition' based on finite-element method. Stress fields are presented at different times. The change of maximal stresses in time is also presented.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":"24 1","pages":"2229-2239"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1092","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51534571","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: 12
Dynamic numerical simulations of void growth and coalescence with stress triaxiality maintained constant : Application to ductile solids with secondary voids 三轴应力保持恒定时孔洞生长和合并的动态数值模拟:应用于具有次生孔洞的延性固体
Communications in Numerical Methods in Engineering Pub Date : 2008-12-01 DOI: 10.1002/CNM.1093
L. Siad
{"title":"Dynamic numerical simulations of void growth and coalescence with stress triaxiality maintained constant : Application to ductile solids with secondary voids","authors":"L. Siad","doi":"10.1002/CNM.1093","DOIUrl":"https://doi.org/10.1002/CNM.1093","url":null,"abstract":"Dynamic explicit finite element analysis is used to investigate void growth and plastic collapse of an axisymmetric unit cell model with a primary spherical void imbedded in a porous matrix material. The Gurson–Tvergaard–Needleman homogenized model is used to describe the plastic behaviour of the matrix material. The simulations are performed under large strain conditions for varying secondary void volume fractions and quasi-static loading controlled by constant stress triaxiality. The proposed accomplishment of constant stress triaxiality associated with dynamic explicit computations provides a method allowing to trace the collapse of the unit cell from the onset of coalescence to practically its final failure. Consistent with experimental and theoretical results available in the literature, the obtained results substantiate the sensitivity of coalescence to the presence of secondary voids. Copyright © 2008 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":"24 1","pages":"2035-2045"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1093","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51534617","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
A hybrid‐Trefftz finite element model for Helmholtz problem Helmholtz问题的混合- Trefftz有限元模型
Communications in Numerical Methods in Engineering Pub Date : 2008-12-01 DOI: 10.1002/CNM.1094
K. Sze, Y. Cheung
{"title":"A hybrid‐Trefftz finite element model for Helmholtz problem","authors":"K. Sze, Y. Cheung","doi":"10.1002/CNM.1094","DOIUrl":"https://doi.org/10.1002/CNM.1094","url":null,"abstract":"In this paper, a hybrid-Trefftz four-node quadrilateral element model is formulated for Helmholtz problem. In this model, two Helmholtz approximations are defined. The first approximation is obtained by nodal interpolation, and the second approximation is truncated from a Trefftz solution set. A hybrid variational functional is employed to enforce the equality of and other necessary conditions on the two approximations. From the numerical tests, it can be seen that the hybrid model is markedly more accurate than the conventional finite element model. Copyright © 2008 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":"24 1","pages":"2047-2060"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1094","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51534926","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: 15
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