US 12,247,895 B1
Method for predicting dummy head injury during automobile collision
Weidong Liu, Tianjin (CN); Zhixin Liu, Tianjin (CN); Yongqiang Wu, Tianjin (CN); Tianyi Hao, Tianjin (CN); Haitao Zhu, Tianjin (CN); Kai Wang, Tianjin (CN); Peng Liu, Tianjin (CN); Hongyang Qi, Tianjin (CN); and Weixiao Li, Tianjin (CN)
Assigned to CHINA AUTOMOTIVE TECHNOLOGY AND RESEARCH CENTER CO., LTD., Tianjin (CN); and CATARC AUTOMOTIVE TEST CENTER (TIANJIN) CO., LTD., Tianjin (CN)
Filed by CHINA AUTOMOTIVE TECHNOLOGY AND RESEARCH CENTER CO., LTD., Tianjin (CN); and CATARC AUTOMOTIVE TEST CENTER (TIANJIN) CO., LTD., Tianjin (CN)
Filed on Aug. 8, 2024, as Appl. No. 18/797,932.
Claims priority of application No. 202311411549.5 (CN), filed on Oct. 30, 2023.
Int. Cl. G01L 5/00 (2006.01); G01M 17/007 (2006.01); G06F 17/10 (2006.01); G09B 23/30 (2006.01)
CPC G01L 5/0052 (2013.01) [G01M 17/007 (2013.01); G06F 17/10 (2013.01); G09B 23/30 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for predicting dummy head injury during an automobile collision, comprising following steps:
enabling a dummy head to collide with a rigid flat plate, wherein the dummy head is a hollow spherical shell body;
obtaining a first data set in a collision process, wherein the first data set at least comprises: a mass, radius, a shell body thickness and a pre-collision speed of the dummy head, as well as a mass and a pre-collision speed of the rigid flat plate; and the pre-collision speeds are speeds when the dummy head just makes contact with the rigid flat plate;
calculating a maximum contact force of the dummy head and the rigid flat plate in the collision process according to the first data set;
dividing a duration of the collision process into a plurality of time intervals; and
calculating an injury value of the dummy head in each time interval according to the maximum contact force, and selecting the maximum injury value as a target injury value, wherein the target injury value is used for representing an injury degree of the dummy head in the collision process;
wherein the calculating the maximum contact force of the dummy head and the rigid flat plate in the collision process according to the first data set comprises the following steps:
calculating a post-collision speed of the dummy head and a post-collision speed of the rigid flat plate according to the kinetic energy theorem and the first data set; the post-collision speeds are speeds at the end moment of the collision between the dummy head and the rigid flat plate; and
calculating the maximum contact force Fmax of the dummy head and the rigid flat plate in the collision process in combination with the law of energy conservation and according to the first data set, the post-collision speed of the dummy head and the post-collision speed of the rigid flat plate;
wherein the post-collision speed of the dummy head is calculated according to following formula:

OG Complex Work Unit Math
wherein v1 represents the pre-collision speed of the dummy head, v′1 represents the post-collision speed of the dummy head, m1 represents the mass of the dummy head, F(t) represents an impact force related to the time, and the change of the impact force meets a change trend of increasing first and then decreasing in the sine curve; and
the pre-collision speed and the post-collision speed of the rigid flat plate are both 0.