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Postbuckling Analysis for Offshore Pipelines with Residual Stresses

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China Ocean Engineering 1991年第2期6卷 127-138页

作者： huang, yuying Qin, Qinghua {2., {2. Huazhong Univ of Science and Technology Wuhan China

Based on the finite displacement theory of elastic shells, the postbuckling behaviour of submarine pipelines with residual stresses is investigated by using a new finite element formula. The corresponding complementary energy functional is first constructed, and then a geometrical stiffness matrix suitable for the postbuckling of a cylindrical shell is derived. In this matrix the effects of initial stresses and harmonic coupling terms have been considered. The formulation presented in this paper can be used to solve a significant class of problems in the analysis of elastic shells.

关键词： Mathematical Techniques Finite Element Method

Effect of Longitudinal Plastic Bending of Pipeline on Buckle Propagation Pressure

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China Ocean Engineering 1991年第1期6卷 117-126页

作者： zhu, dashan {2., {2. Cheng, Jiangtian Huazhong Univ of Science and Technology Wuhan China

A plastic ring-beam model simulating the longitudinal transition zone of submarine pipelines in the buckle propagation is presented. The nonlinear relationships between the buckle propagation pressure and the length of the transition zone and the position parameter of the longitudinal plastic hinge are derived using the energy principle. The related values are obtained by means of solving a set of nonlinear equations. The model conforms better to reality than the ring models for considering the effect of the longitudinal plastic bending of the transition zone. The computations for some stainless steel and aluminum tubes with different geometrical parameters are performed. The results obtained agree better with the experimental results than existing theoretical predictions.

关键词： Aluminum and Alloys Mathematical Models Mathematical Techniques Nonlinear Equations Stainless Steel

Dynamic Analysis of Submarine Pipelines on an Elastic / Viscoelastic Foundation

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China Ocean Engineering 1993年第3期8卷 333-340页

作者： Lei, Xinhai Qian, Qin huang, yuying {2., {2. Wuhan China

This paper presents a new finite element method for solving static and dynamic problems in laying operation of pipelines. The effect of the viscoelastic soil behavior is considered by using the Pasternak foundation mo... 详细信息

关键词： Boundary value problems Computer aided analysis Dynamics Finite element method Foundations Mathematical models Soil mechanics Viscoelasticity

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海底管线用铰接式托架铺设时的大变形分析

华中工学院学报 1986年第3期 329-336页

作者：朱达善黄玉盈华中工学院力学系

本文在文献[1]的基础上,进一步研究了管线用铰接式托架铺设时的大变形问题。文中对托架段和悬跨段同时采用奇异摄动法分别求解,然后利用两段交接处的连续条件成功获得了全条管线变形解的二阶近似式。

关键词：托架大变形奇异摄动火炮构件段管线悬跨铰接式

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螺线管线圈式MEMS永磁电动机的热分析

航空动力学报 2023年第10期38卷 2383-2394页

作者：黄志平吴玉莹王文斌朱凯云吴瀚枭雷凯博徐天彤北京航空航天大学航空发动机气动热力国家级重点实验室北京100191

针对一种螺线管线圈式MEMS(微机电系统)永磁电动机进行了热分析并给出了初步测温方案。介绍了此MEMS永磁电动机的总体设计方案,选用单晶硅衬底内二氧化硅绝缘的绕组达到散热性能优异的目的,利用ANSYS的稳态传热和静结构力学模块进行热... 详细信息

针对一种螺线管线圈式MEMS(微机电系统)永磁电动机进行了热分析并给出了初步测温方案。介绍了此MEMS永磁电动机的总体设计方案,选用单晶硅衬底内二氧化硅绝缘的绕组达到散热性能优异的目的,利用ANSYS的稳态传热和静结构力学模块进行热固耦合模拟。在此基础上,通过数值模拟验证了电动机静子温度分布均匀,可将绕组和衬底视为无温度梯度。通过热固耦合模拟,得出不发生膨胀失配的最大工作温度为86℃和相应的最大发热损耗功率为2.83 W,据此预估电动机的额定工作性能,验证了本电动机的耐温能力和高功率密度潜力,最终设计的额定输出功率为0.362.W,计算的设计功率密度为0.117 W/g。

关键词：电动机热分析 MEMS电动机永磁电动机 MEMS螺线管线圈膨胀失配