The Establishment And Research Of Finite Element Model Of Parameterized Children In 6-12 Years

Children are easily injured in traffic accidents.Children's physical parameters vary widely.Children's models under the specific human physical parameters cannot meet the developing needs.Establishing the parametric children model is significant for the research of children's injury,the protection of occupant,and the optimization of constraint system.In terms of children's external body surface,our group has established parametric child external body surface at the age of 6-12,which is the three-dimensional point cloud model.As for internal anatomy,our team has established a parameterized head,neck and chest rib model of children aged 3-12 years which is a mesh model.In the aspect of simulation,the team members have carried out corresponding research on the neck of parameterized children aged 3-12 years.However,the current external surface geometric model is not suitable for the development of the whole human model and it needs to be transformed into a mesh model.The i nternal anatomy is only including the head,neck and chest ribs and there are no other internal anatomy.At present,the team is only studying the single object and has not established a complete parameterized finite element model of children.Therefore,on the basis of previous research,the main contents of this paper are as follows:1)Transforming the geometric model of external body surface into the mesh model.Firstly,this paper introduces the mark points of children's external body surface.Then,based on the existing external body surface geometry model,a grid transformation method is developed for parameterized external body surface geometry model of children aged 6-12 in China.It is necessary to determine and unify the order and location of mark points on the external body surface of parameterized children aged 6-12.This article checks the mesh quality of the model under different physical parametersand analyzes the accuracy of the model.2)Obtaining the internal anatomy of children aged 6-12.On the basis of the existing parameterized head,neck and rib models,the scaling coefficients suitable for this study are calculated by referring to the literature,and the other required skeletal models such as pelvis and femur are scaled strictly.3)Positioning and splicing the external and internal anatomy.Firstly,the article introduces the joint points of internal anatomy,and developes the splicing program suitable for internal and external models.Then,the splicing points of internal anatomy and external body surface of parameterized children aged 6-12 years in China are strictly determined,and semi-automatic splicing is carried out through the program.Combining with this study,the appropriate splicing sequence is determined and the parameterized children model of 6-12 years is established.4)This article reasonably establishes the scaling coefficient of skeletal materials of the head and chest of children aged 6-12.Referring to the cadaver experiment,the head and chest of the model are simulated.Comparing with the existing cadaver experimental curves,the dynamic response of the head and chest age d 6 and 10 models are analyzed and judged.The results show that the method of parametric mesh transformation for children's external body surface is excellent,and the accuracy of the generated mesh model is high.The scaling model of internal anatomy is rigorous and suitable for the establishment of whole body model and the developed method for locating and splicing external body surface and internal anatomy is oriented to children with different physical parameters,with lower error and short splicing time.The head and chest skeleton materials scaling coefficient is reasonable and the model has a good response.The parameterized finite element model for children aged 6-12 has high application value and research significance.