应用流固耦合方法的鸡蛋动力学特性研究

Study on the dynamic mechanical behaviors of egg using fluid-structure coupling approach

根据模态与声测实验,确定了一阶模态振动为鸡蛋动力学分析特性参数,应用有限元流-固耦合方法分析了鸡蛋的结构动力学响应。以此为基础,将鸡蛋构成组分的各物性参数作为自变量,蛋体结构动力响应的一阶模态频率为因变量,比较分析了不同物性参数条件下鸡蛋动力学响应的变化规律。结果表明:鸡蛋各物性参数中蛋形参数、蛋壳厚度、蛋壳弹性模量、蛋白液密度变化的影响效应较为显著。蛋形参数与蛋体结构一阶模态频率间符合弹性体振动的质量-频率关系;蛋壳增厚0.05 mm,蛋体一阶模态频率增大300 Hz,呈线性规律;蛋壳弹性模量每增加1×10~10Pa,结构一阶模态频率减少430~850 Hz;蛋白液密度每增加100 kg/m^3,结构一阶模态频率减少100~300 Hz;蛋壳弹性模量与蛋白液密度的影响表现为非线性规律。

Based on the modal experiment and sound measurement,the 1st order mode of the egg wad defined as the parameters of the egg structure dynamic analysis.The finite element method of fluid-structure coupling was used to obtained the response of the egg dynamic behavior. Based on the simulation, the comparative study was carried out to find the relationship between the 1st modal frequency of whole egg and the egg composition parameters.The results showed that among the components of the egg, the Sl, shell thickness, shell stiffness and egg white density had great influence on the 1st modal frequency.The egg Sl and the 1st frequency of whole egg were consistent with the mass-frequency law.The 1st modal frequency of whole egg was increased by 300 Hz with the eggshell thickening of 0.05 mm, the relationship was linear. The 1st modal frequency of whole egg was decreased by 430-850 Hz with increasing of 1 × 10^10 Pa of the eggshell modulus,the 1st modal frequency of whole egg was decreased by 100-300 Hz with increasing of 100 kg/m3 of the egg white density,those two had nonlinear effects on the dynamic parameter.