电磁场论文范例新能源汽车和电动汽车相关学术论文怎么写2万字有关写作资料-论文写作网

新能源汽车和电动汽车论文范文

《基于稳定节点光滑有限元法的纯电动汽车电磁场仿真》

该文是新能源汽车和电动汽车相关开题报告范文与电磁场方面学术论文怎么写.

摘要：针对纯电动汽车电磁场数值分析时传统有限元法（finite element method, FEM）因数值“过硬”而计算精度低的问题,在传统FEM的基础上引入梯度光滑技术和稳定项修正,采用基于稳定节点的光滑有限元法（stable nodebased oothed FEM, SNEM）对长直接地金属槽和纯电动汽车整车电磁场算例进行仿真分析.结果表明,SNEM可显著降低前处理网格划分难度,在一定程度上软化数值模型,具有计算效率高、精度高、收敛速度快和抗网格畸变能力强等优点,在工业应用中具有较大潜力.

关键词：

纯电动汽车; 稳定节点; 积分算法; 梯度光滑; 电磁场; 有限元

中图分类号： TB115.1; TM153.1

文獻标志码： B

Electromagnetic field simulation of pure electric vehicle based

on stable nodebased oothed finite element method

GUO Zhibin, HUANG Zhanyong, WANG Zhonghu, WANG Gang

（School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China;

Tianjin Key Laboratory of Power Tranission and Safety Technology for New Energy Vehicles, Tianjin 300130, China）

Abstract：

The numerical value is "overlystiff" in the traditional finite element method（FEM） for electromagnetic field numerical analysis of pure electric vehicle, which leads to its low precision. As to this issue, the gradient oothing technique and the correction of stability term are employed based on the traditional FEM, the electromagnetic fields of long straight grounding metal slot and pure electric vehicle are simulated and analyzed by using stable nodebased oothed FEM（SNEM）. The results show that the difficulty of mesh generation can be reduced using SNEM, and the numerical model is softened in a certain extent. The advantages of SNEM are high efficiency, high precision, fast convergence and strong ability to resist grid distortion. SNEM has great potential in industrial application.

Key words：

pure electric vehicle; stable node; integration method; gradient oothing; electromagnetic field; finite element

0 引言

电动汽车电磁场的数值分析,对于评估其电磁安全性具有重要意义.有限元法（finite element method, FEM）是电磁场数值计算中最常用的方法之一,广泛应用于电动汽车的电磁仿真中.[13]黄劭刚等[4]利用FEM研究发电机旋转磁场波形和电压波形;王春兰等[5]利用FEM研究电涡流传感器的电磁场问题,并验证计算结果的有效性.传统FEM可以解决大部分电磁场数值计算问题,但是也存在缺陷,离散网格的尺寸、插值函数的阶次等因素对算法精度影响很大.对于某些复杂的工程结构,FEM需要重复多次进行网格划分和加密操作,增加设计难度且降低计算效率.[6]针对传统FEM的缺点,边界元法（boundary element method, BEM）被提出.BEM只需对边界进行离散,在前处理阶段有较大优势,广泛应用于无界区域的电磁分析.[710]但是,使用边界积分方程离散得到的系数矩阵是满秩矩阵,因此BEM计算效率较低,难以解决大规模的实际工程问题.

近年来,针对电磁问题,专家学者提出多种新的方法,并取得较大进展.LIU等[11]在FEM中引入梯度光滑的概念,提出基于节点的光滑有限元法（nodebased oothed FEM, NEM）,可有效软化计算模型的刚度,显著提高数值解精度,数值分析的计算结果较好[1213].但是,NEM模型“过软”,其不稳定性阻碍其在复杂工程中的应用.[14]FENG等[15]和WANG等[16]将应变梯度项引入能量方程,进一步提出基于稳定节点的光滑有限元法（stable nodebased oothed FEM, SNEM）,可用于模拟电磁成形和电磁铆接过程[1720].通过添加稳定项进行修正,NEM的稳定性得到有效改善,并可获得理想的系统刚度.CUI等[17]验证SNEM具有较高的计算精度并且可以消除NEM解的不稳定性缺陷.基于上述研究工作,本文建立纯电动汽车电磁场分析数值模型,推导利用SNEM求解纯电动汽车电磁场的基本公式.利用SNEM分析长直接地金属槽模型和纯电动汽车整车电磁场模型,验证其可靠性,结果表明：与FEM相比,SNEM计算精度更高、收敛性更好,可有效地用于工程电磁场的仿真分析.

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（編辑章梦）

总结：该文是关于电磁场方面的论文题目可用作相关论文提纲和新能源汽车和电动汽车文献综述的参考文献.

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