Improved Transmission Line Method for Parallel Finite Element Calculation in Temperature Field of Electrical Apparatus

doi:10.16628/j.cnki.2095-8188.2022.03.005

Abstract

Abstract:

Higher solution accuracy and solution efficiency of the temperature field simulation are required,to satisfy the optimization design and the development of multi-physical field coupling simulation of high-power electrical apparatus.The transmission line iteration method (TLM) is used to accelerate the finite element analysis of three-dimensional nonlinear heat conduction problem.In order to further improve the efficiency of TLM,the transmission line admittance determination principle and relaxation iteration method are proposed.The parallel computing technology is used to realize the acceleration of TLM.The improved TLM is applied to solve the temperature field of the direct-acting relay,and the accuracy of the algorithm is verified by comparing the solution results with commercial software COMSOL and Newton-Raphson iteration.Compared with the traditional Newton-Raphson iteration,TLM can achieve a stable solution efficiency improvement.

Key words: finite element analysis, transmission line method, parallel computing, relay, temperature field

CLC Number:

TM764

QIU Zilan, YANG Wenying, PENG Fei, ZHAI Guofu. Improved Transmission Line Method for Parallel Finite Element Calculation in Temperature Field of Electrical Apparatus[J]. LOW VOLTAGE APPARATUS, 2022, 0(3): 30-38.

Figures/Tables 12

References 29

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材料名称	组件	热导率(数据来源于COMSOL材料库)
黄铜	静触头	λ=555.4-2.116 905T+0.008 971 429 T²-1.266 667×10^-5T³
	动触头
	线圈
	轴套
DT4E	轭铁	λ=155.635 5-0.447 094 3T+ 8.992 2×10^-4T²-9.859 391×10^-7 T³+4.862 049×10^-10T⁴-7.562 752× 10^-14T⁵
	孔轭铁
	衔铁
	外壳
不锈钢	连杆	λ=6.742 253+0.028 649 15T
陶瓷	陶瓷座	λ=16.7
聚酰亚胺	线圈骨架	λ=-0.007 707 532+0.005 769 13T+ 5.622 796×10^-7T²-4.329 984× 10^-10T³
空气	其余部分	λ=-0.002 275 8+1.154 80×10^-4T -7.902 52×10^-8T²+4.117 02× 10^-11T³-7.438 64×10^-15T⁴

节点编号	坐标/mm	COMSOL 温度/K	NR温度/K	TLM温度/K
1	(0,0,0)	323.026	323.091	323.091
2	(-1.27,5.86,-6.86)	323.068	323.129	323.129
3	(-8.50,1.06,14.90)	321.430	321.521	321.542
4	(-4.55,6.65,20.20)	320.113	320.272	320.273
5	(-13.45,18.78,4.39)	323.183	323.215	323.315
6	(2.56,-19.01,15.77)	321.390	321.490	321.490
7	(17.37,-15.14,13.39)	321.909	322.029	322.029
8	(10.01,13.89,23.30)	320.458	320.594	320.595
9	(20.55,-2.48,26.30)	320.891	321.013	321.013
10	(-23.92,-3.30,-32.50)	322.971	323.030	323.030

节点编号	NR相对误差/%	TLM相对误差/%
1	0.020	0.020
2	0.018	0.018
3	0.028	0.035
4	0.049	0.050
5	0.010	0.041
6	0.031	0.031
7	0.037	0.037
8	0.042	0.042
9	0.038	0.038
10	0.018	0.018

编号	单元数目	NR		TLM
		迭代次数/次	单步迭代时间/s	迭代次数/次	单步迭代时间/s
		1	540 580	4	85.82	235	0.181
2	492 177	4	63.31	250	0.161
3	344 274	4	23.62	285	0.123
4	174 825	4	6.48	269	0.052