COMSOL谷物水分检测棒体仿真与优化

Simulation optimization and experimental validation of grain moisture detection probe body based on COMSOL

为提升水稻含水率在线检测的精度,本文提出了一种适用于谷物仓或干燥仓的阵列棒式电容传感器结构及其水分检测方法。使用COMSOL Multiphysics 6.1软件对平行电极棒式电容器进行了静电场模拟仿真,通过调整其物理参数探究电极棒长度、半径、轴间距与电场边缘效应的变化关系。以电容器灵敏度作为试验指标,使用Design-Expert 13.0软件对平行电极棒电容器的长度、半径、轴间距进行三因素三水平Box-Behnken响应面试验设计,通过方差分析和响应曲面分析得到最优的电极棒结构尺寸参数,最后将其扩展为电极阵列。研究表明:在满足装置机械设计要求情况下,电极棒长度63.4806 mm,电极棒半径1.44934 mm,电极棒的轴间距14.7305 mm的平行电极棒式电容器受边缘效应影响程度最低,是本研究水稻含水率在线检测装置的最优电极棒的结构参数。

To enhance the accuracy of online moisture content detection in rice,this paper proposes an array rod-type capacitive sensor structure suitable for grain or drying silos,along with a moisture detection method.Using COMSOL Multiphysics 6.1 software,a static electric field simulation of parallel electrode rod capacitors was conducted.By adjusting physical parameters,the study explored the relationship changes between electrode rod length,radius,inter-axial distance,and the edge effects of the electric field.The sensitivity of the capacitor served as the experimental indicator.Using Design-Expert 13.0 software,a three-factor,three-level Box-Behnken response surface experimental design was conducted for the length,radius,and inter-axial distance of the parallel electrode rod capacitors.Through variance analysis and response surface analysis,optimal structural size parameters for the electrode rods were obtained.Finally,this was expanded into an electrode array.The study indicates that under the constraints of mechanical design requirements,a parallel electrode rod capacitor with an electrode rod length of 63.4806 mm,radius of 1.44934 mm,and inter-axial distance of 14.7305 mm experiences the least impact from edge effects,making it the optimal electrode rod structure for the online moisture detection device in this study.