汽车风阻系数灵敏度分析方法研究

doi:10.19562/j.chinasae.qcgc.2021.09.010

Abstract

Abstract:

Through the theoretical derivation of drag coefficient sensitivity， the key locations of car body styling surface affecting drag coefficient are found out. According to the sensitivities obtained， automatic deformation technology is adopted to realize the grid self?learning and self?judgment of the changes of styling surface affecting drag coefficient， and finally achieve the goal of automatic optimization of vehicle aerodynamic drag. By the drag coefficient sensitivity analysis for a SUV， the effectiveness of the application of the sensitivity analysis and automatic deformation technology to the calculation of aerodynamic drag coefficient is verified. The method can reach the preset target value of drag coefficient without manual involvement in the whole process of calculation.

Key words: drag coefficient, sensitivity, automatic deformation, grid self?learning, self?judgment

Xin Zheng,Donghai Su. Research on Sensitivity Analysis Method of Vehicle Drag Coefficient[J].Automotive Engineering, 2021, 43(9): 1336-1342.

Figures/Tables 16

References 15

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序号	风阻系数	风阻系数变化量/%
原模型	0.350	0
网格变形1	0.345	1.4
网格变形3	0.342	2.3
网格变形4	0.336	4.0

部位	优化方案		减阻情况（counts）
部位	试验项目	变量范围	仿真值	试验值
车头	前唇长度	+0.02 m	-1	-1
	前保险杠左侧端面Y向位移	-0.003 m	-1	-2
	前保险杠右侧端面Y向位移	+0.003 m	-1	-2
客舱	机盖与前风窗夹角	+5°	-2	-3
	前风窗与顶盖夹角	+3°	-2	-2
	A柱台肩高度	-0.003 m	-2	-1
	顶盖倾角	+3°	-3	-2
尾部	后保险杠左侧端面绕其与X轴同向的水平轴旋转	+3°	-3	-4
	后保险杠右侧端面绕其与X轴同向的水平轴旋转	-3°	-3	-4
	尾翼X向长度	+0.01 m	-3	-3

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Research on Sensitivity Analysis Method of Vehicle Drag Coefficient

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