Design And Research Of Bionic Articulator Based On Chewing Trajectory

Bionic masticatory mechanism is a kind of mechanical device based on human masticatory movement mechanism,which can simulate human mandibular masticatory function.It has great research significance for food texture assessment and denture material detection.Based on the structure and function of human chewing system,combined with the special name of cutting chewing trajectory and grinding chewing trajectory,a bionic occlusal frame mechanism which can reproduce the chewing trajectory is designed,and a parametric design system of bionic occlusal frame is developed.Then the kinematics analysis of the mechanism is carried out by using the motion simulation function module of the system,which proves the rationality of the mechanism.First,introduces the human chewing system,human chewing can be divided into two stages: cutting and grinding.The characteristics of grinding trajectory are emphatically introduced.Then,based on the three-dimensional trajectory data of the marker ball during human chewing movement obtained by the optical motion capture system,the mandibular trajectory was solved.Secondly,through the analysis of the characteristics of chewing movement,and according to the relevant knowledge of mechanism,the working principle and structure of bionic dental arch were determined.Then using MATLAB programming and three-dimensional modeling software motion simulation inverse method,verify each other to solve the core mechanism of fixed cam and connecting rod combination mechanism of cam contour.Around its core mechanism,also designed the damping simulation tooth and upper tooth position adjustment mechanism.Finally,the three-dimensional modeling and virtual assembly of bionic occlusal frame were carried out according to its working principle.Finally,based on the principle of secondary development,using SolidWorks 2020 as the development platform and C # as the development language,in Visual Studio 2017 integrated development environment,the parametric design system of bionic occlusal frame with good human-computer interaction interface was designed and secondary developed.The parametric design system is mainly composed of three functional modules,namely,cam profile module,assembly module and motion simulation module.In this paper,the cutting trajectory and grinding trajectory data obtained from the simulation of the virtual prototype model of the bionic dental arch based on Adams were compared with the data collected from the optical motion capture experiment,and the rationality of the mechanism was proved.Then,the motion simulation function module in the parametric design system was used to emphatically analyze the variation law of the displacement,velocity and acceleration of the motion trajectory of the bionic dental arch under three kinds of grinding trajectories.The change trend of displacement is similar to the change trend of human grinding trajectory,and the change trend of speed is generally consistent with the change trend of human chewing speed.The change trend of speed is rising-maximum-decreasing-minimum-rising-decreasing-rising.In addition,the minimum value of acceleration was obtained in the process of motion trajectory from the rightmost position to the lowest position,and the maximum value was obtained in the process of motion trajectory from the lowest position to the leftmost position.The change trend of acceleration is reduced-minimum-rise-maximum-decrease-rise-decrease.