Parameter calculation of traffic accidents based on the plastic deformation energy and the improved momentum method

doi:10.3969/j.issn.1674-8484.2022.03.005

Abstract

Abstract:

An improved model was proposed to compute the traffic accident parameters through combining the vehicle plastic deformation energy and the conventional momentum model. The model was based on the two-dimensional point collision dynamics with comprehensively considering the plane and rotary motions, and also considered the angular velocity before the collision of two vehicles in accidents. Plane motions and rotary motions occurred between two vehicles in the collision process with momentum-impulse exchanges in a real traffic accident case. Through numerical simulations, both linear and angular velocities of collided vehicles in the traffic accident were calculated and analyzed, and the traffic accident scenarios were reconstructed. The numerical simulation results compared very well with those of PC- CRASH software. The results show that the calculated results by the improved momentum model are very close to the results obtained by the PC-CRASH software with a linear velocity error of less than 5%. The results of the improved model are closer to that of the real situation of vehicle frontal non-center collision accidents compared with the traditional energy method.

Key words: traffic safety, traffic accident reconstruction, improved momentum model, collision deformation, recovery factor, vehicle motion parameters

CLC Number:

U491.31

CHEN Jiayong, WU Xinye. Parameter calculation of traffic accidents based on the plastic deformation energy and the improved momentum method[J]. Journal of Automotive Safety and Energy, 2022, 13(3): 446-452.

Figures/Tables 12

References 23

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车辆编号	m / t	J / (t·m²)	各项尺寸 / m
车辆编号	m / t	J / (t·m²)	L	W	H	R	a_j	b_j	C₁	C₂	C₃	C₄	C₅	C₆	W₀
车1	1.610	2.599	4.67	1.90	1.34	1.46	-1.04	-0.61	0.25	0.36	0.46	0.44	0.42	0.43	0.84
车2	1.360	1.409	4.2	1.745	1.20	1.33	2.11	0.70	0.21	0.32	0.41	0.42	0.43	0.34	0.73

车辆编号	m / t	J / (t·m²)	各项尺寸 / m
车辆编号	m / t	J / (t·m²)	L	W	H	R	a_j	b_j	C₁	C₂	C₃	C₄	C₅	C₆	W₀
车1	1.610	2.599	4.67	1.90	1.34	1.46	-1.04	-0.61	0.25	0.36	0.46	0.44	0.42	0.43	0.84
车2	1.360	1.409	4.2	1.745	1.20	1.33	2.11	0.70	0.21	0.32	0.41	0.42	0.43	0.34	0.73

车辆编号	v_i₁ m·s^-1	ω rad·s^-1	α (°)	(N,T) / m
车辆编号	v_i₁ m·s^-1	ω rad·s^-1	α (°)	车1	车2
车1	11.74	1.19	-30	（7.12,-2.56）	（7.06,-2.50）
车2	8.95	1.16	153	（-5.44,2.11）	（-5.58,2.10）

车辆编号	v_i₁ m·s^-1	ω rad·s^-1	α (°)	(N,T) / m
车辆编号	v_i₁ m·s^-1	ω rad·s^-1	α (°)	车1	车2
车1	11.74	1.19	-30	（7.12,-2.56）	（7.06,-2.50）
车2	8.95	1.16	153	（-5.44,2.11）	（-5.58,2.10）

车辆编号	v / (km·h^-1)	ω / (rad·s^-1)	H / m	a / (m·s²)
车1	56.7	0.40	0.58	5.4
车2	44.5	0.10	0.60	5.8