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- W3080111614 abstract "As a representative part of the oral system and masticatory robot system, the modeling method of the dental model is an important factor influencing the accuracy of the multi-body dynamic model. Taking the right first molars of the masticatory robot as the research object, an equivalent model, point-contact higher kinematic pair composed of v-shaped surface and sphere surface, was proposed. Firstly, the finite element method was used to analyze the occlusal dynamics of the original model in three static contact cases (intrusive contact, centric occlusion, and extrusive contact) and one dynamic chewing case, and the expected bite force was obtained. Secondly, the Hertz contact model was adopted to establish the analytical expression of the bite force of the equivalent model in three static contact cases. The normal vectors and contact stiffness in the expression were designed according to the expected bite force. Finally, the bite force performance of the equivalent model in three static contact cases and one dynamic chewing case was evaluated. The results showed that the equivalent model could achieve the equivalent bite force of 8 expected items in the static contact cases. Meanwhile, the bite force in the early and late stages of the dynamic chewing case coincides well with the original model. In the middle stage, a certain degree of impact is introduced, but it can be weakened by subsequent trajectory planning. The equivalent modeling scheme of the dental model proposed in this paper further improves the accuracy of the dynamic model of the multi-body system. It provides a new idea for the dynamic modeling of other complex human contacts.牙颌模型作为口颌系统与咀嚼机器人系统的代表性部件，其建模方式是影响此类多体系统动力学模型准确度的重要因素。本文以咀嚼机器人右侧第一磨牙为研究对象，提出一种由 V 型面与球面构成的点接触高副等效建模方式。首先，利用有限单元法对原始模型的 3 种静态接触工况（咬入接触、正中接触、咬出接触）与动态咀嚼工况进行咬合动力学分析，得到期望咬合力；其次，运用赫兹接触模型建立点接触高副等效模型静态接触工况的咬合力解析式，根据期望咬合力对解析式内法向量与咬合刚度等参数进行等效设计；最后，对等效模型在静态接触与动态咀嚼工况中的咬合力表现进行评价。本文结果表明，等效模型能够实现静态接触工况 8 项期望咬合力的等效，同时对动态咀嚼工况初期与末期咬合力变化吻合良好，中期引入一定程度的冲击，但可通过后续轨迹规划进行弱化。本文所提出的牙颌模型等效建模方案，进一步提升了多体系统动力学模型准确性，也为人体其他复杂接触的动力学建模提供了新思路。." @default.
- W3080111614 created "2020-09-01" @default.
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- W3080111614 date "2020-08-25" @default.
- W3080111614 modified "2023-09-26" @default.
- W3080111614 title "[Equivalent modeling and evaluation of molars using point-contact higher kinematic pair based on occlusal dynamic analysis]." @default.
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- W3080111614 doi "https://doi.org/10.7507/1001-5515.201906021" @default.
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