基于试验设计与PSI决策相结合的白车身前端结构轻量化设计

doi:10.19562/j.chinasae.qcgc.2021.01.016

Abstract

Abstract:

A lightweight design strategy combining design of experiments and PSI decision tool is proposed to improve the efficiency of BIW lightweight design. First of all， a finite element analysis on the basic static?dynamic performance and the frontal collision safety performance of BIW is conducted and the correctness of the finite element model is verified by vehicle frontal crash test. Then the design variables for the front?end structure of the BIW are screened in by using contribution analysis technique. Next， the lightweight candidate solutions for the front?end structure of the BIW are obtained through the design of experiments. Finally， PSI method is used to make multi?objective decision from numerous lightweight candidate solutions to obtain the best lightweight solution. The results show that after lightweight design the mass of front?end structure of BIW is reduced by 4.43 kg， corresponding to a lightweighting rate of 7.23 %， while the performance of BIW meets the design baseline requirements.

Key words: BIW, lightweight, crashworthiness, design of experiments, PSI decision making

Dengfeng Wang,Shenhua Li. Lightweight Design for the Front⁃end Structure of BIW Based on the Combination of the Design of Experiment and PSI Decision Tool[J].Automotive Engineering, 2021, 43(1): 121-128.

Figures/Tables 20

$D F m a x / m m$	$D D m a x / m m$	$A C C / g$
157.41	4.30	42.31

$f T / H z$	$f B / H z$	$S T / (N · m · (°) - 1)$	$S B / (N · m m - 1)$
38.00	48.55	20 949.97	16 412.30

$D F m a x / m m$	$D D m a x / m m$	$A C C / g$
165.25	4.52	44.43

References 14

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序号	T1	T5	T6	T10	T11	T12	…	T24	T25	T26
1	0.96	1.62	2.08	1.38	1.26	1.10	…	1.06	1.41	0.70
2	0.97	1.71	2.53	1.30	1.52	1.32	…	1.10	1.47	0.71
3	0.98	1.31	2.64	1.59	1.27	1.49	…	1.13	1.50	0.72
4	0.98	1.67	1.79	1.68	1.34	1.54	…	1.14	1.52	0.72
5	0.98	1.49	2.12	1.32	1.40	1.60	…	1.15	1.53	0.73
?	?	?	?	?	?	?	?	?	?	?
95	1.24	1.93	2.47	1.74	1.23	1.59	…	1.06	2.16	0.84
?	?	?	?	?	?	?	?	?	?	?
118	1.31	1.38	2.26	1.65	1.27	1.33	…	1.36	1.74	0.74
119	1.32	1.74	2.59	1.74	1.33	1.39	…	1.37	1.75	0.74
120	1.32	1.56	2.04	1.28	1.40	1.44	…	1.38	1.77	0.74

序号	M/kg	f_T/Hz	f_B/Hz	S_T/(N·m·(°)^-1)	S_B/(N·mm^-1)	D_Fmax/mm	D_Dmax/mm	A_CC/g
1	49.81	38.64	50.33	20 229.16	16 367.14	170.16	6.54	49.02
2	52.71	38.64	50.66	21 577.32	16 924.52	167.44	4.97	40.95
3	53.55	38.66	50.85	22 018.81	17 028.19	144.67	6.34	46.29
4	54.19	38.65	50.96	19 914.73	16 207.94	135.48	4.98	40.54
5	54.22	38.64	50.73	20 868.06	16 621.84	155.47	4.73	47.03
?	?	?	?	?	?	?	?	?
95	56.86	38.69	50.68	22 541.35	17 010.02	112.99	3.55	44.33
?	?	?	?	?	?	?	?	?
118	56.00	38.71	51.61	21 820.94	17 071.86	141.17	5.83	52.34
119	57.62	38.71	51.72	22 695.66	17 457.93	136.13	5.67	41.73
120	56.76	38.69	51.39	21 175.58	16 846.08	117.43	4.10	45.50

序号	试验设计结果归一化处理								P_i	排序
序号	M	f_T	f_B	S_T	S_B	D_Fmax	D_Dmax	A_CC	P_i	排序
1	1.000 0	0.997 8	0.973 1	0.877 3	0.931 3	0.625 2	0.510 6	0.674 6	0.819 8	110
2	0.945 0	0.998 1	0.979 4	0.935 7	0.963 0	0.635 3	0.672 1	0.807 6	0.864 0	55
3	0.930 0	0.998 5	0.983 1	0.954 9	0.968 9	0.735 3	0.526 7	0.714 4	0.839 0	79
4	0.919 1	0.998 1	0.985 2	0.863 6	0.922 2	0.785 2	0.670 3	0.815 7	0.857 6	60
5	0.918 6	0.997 9	0.980 8	0.905 0	0.945 8	0.684 2	0.706 0	0.703 2	0.865 4	53
?	?	?	?	?	?	?	?	?	?	?
95	0.876 0	0.999 3	0.979 9	0.977 5	0.967 9	0.941 5	0.939 9	0.746 0	0.945 3	1
?	?	?	?	?	?	?	?	?	?	?
118	0.889 4	0.999 6	0.997 8	0.946 3	0.971 4	0.753 6	0.572 6	0.631 8	0.846 8	72
119	0.864 4	0.999 7	1.000 0	0.984 2	0.993 4	0.781 4	0.588 8	0.792 5	0.858 3	58
120	0.877 5	0.999 1	0.993 6	0.918 3	0.958 5	0.905 9	0.815 2	0.726 8	0.907 3	25

项目	M/kg	基本静-动态性能				正撞安全性能
项目	M/kg	f_T/Hz	f_B/Hz	S_T/(N·m·(°)^-1)	S_B/(N·mm^-1)	D_Fmax/mm	D_Dmax/mm	A_CC/g
轻量化后	56.85	38.70	50.65	22 531.35	17 012.21	116.82	3.66	44.12
改变	-7.23%	-3.25%	-0.88%	+2.17%	-1.53%	-25.78%	-14.88%	+4.28%

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Lightweight Design for the Front⁃end Structure of BIW Based on the Combination of the Design of Experiment and PSI Decision Tool

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