仿生耕糟刀的设计与仿真实验

Simulation and design of raking knives based on bionic design method

为了缩短麦芽汁在过滤槽内的过滤周期,提高麦芽汁的品质,设计了一种适合过滤槽耕糟作业的仿生耕糟刀。通过重构蝼蛄挖掘足爪趾的生物体模型,并模拟爪趾楔入土壤的动力学过程,发现爪趾T4的功能特性与耕糟刀的设计目标相似性最高。提取爪趾T4的生物模型的主要轮廓曲线,并拟合曲线方程,生成拟合曲线,将拟合曲线应用于仿生耕糟刀的耕犁轮廓线和刀板水平截面轮廓线的设计。对方案进行耕糟模拟验证。研究结果表明,与原型产品相比仿生耕糟刀作用于麦糟后,耕糟刀表面产生的最大剪切应力降低18.90%;过滤槽内壁面产生的最大剪切应力降低19.01%;最大流体速度降低11.46%。

In order to shorten the filtration period of wort in the lauter tun and improve the quality of wort,A bionic raking knife suitable for the operation of the lauter tun was designed.The biological model of mole cricket claw teeth of its digging foot was reconstructed,and the dynamic process of claw teeth wedging into soil was simulated.According to the simulation results,the claw tooth T4 has the highest similarity with the design objectives of raking knife.The key contour curve is extracted from the biological model of claw tooth T4,and the curve formula is fitted with the coordinates of several points of the curve,and the fitted curves are generated.The fitting curves are applied to the design of plow contour line of bionic raking knife and the main contour line of horizontal section of blade board.Finally,the design scheme was verified by simulation.The results show that,compared with the prototype,the maximum shear stress on the surface of the raking knife is reduced by 18.90%;the maximum shear stress on the inner wall of the lauter tun is reduced by 19.01%;and the maximum fluid velocity is reduced by 11.46%.