基于COMSOL的小麦含水率在线检测装置设计与试验  

Design and Experiment of Online Testing Device for Wheat MoistureContent of Combine Harvester Based on COMSOL

作　　者：姬虹[1,2] 李康 宋东方 王万章[2] 李保谦 冯伟[2] Ji Hong;Li Kang;Song Dongfang;Wang Wanzhang;Li Baoqian;Feng Wei(Henan Polytechhnic,Zhengzhou 450046,China;College of Mechanical Engineering,Henan Agricultural University,Zhengzhou 450002,China)

机构地区：[1]河南职业技术学院,郑州450046 [2]河南农业大学机电工程学院,郑州450002

出　　处：《农机化研究》2025年第7期80-88,共9页Journal of Agricultural Mechanization Research

基　　金：中央引导地方科技发展资金项目(Z20221341068);郑州市科技惠民计划项目(2022KJHM0045);河南省科技厅科技攻关项目(242102110359);河南省科技厅重点软科学项目(242400411017)。

摘　　要：含水率是判断小麦成熟和适收的关键指标,及时准确获取小麦含水率,有利于进行小麦的收获生产规划,指导联合收获机作业调度,确保小麦在成熟期阶段精准收获。为提高联合收获机小麦含水率在线检测系统精度,设计了一种同侧圆弧式电容小麦籽粒含水率在线检测传感器,并对其结构和工作原理进行了有限元仿真分析和电容极板结构参数优化试验。基于COMSOL Multiphysics软件,对同侧圆弧式电容含水率检测传感器结构参数即极板数目、极板尺寸规格和极板间距值进行优化设计,得到最终优化参数:当同侧圆弧电容三极板式小麦籽粒含水率检测传感器驱动极板宽度为45 mm、感应极板宽度为23 mm、极板边间为18 mm、极板长为135 mm参数下,电容和介电常数之间满足线性相关关系,决定系数R2接近1。Moisture content is a key indicator to judge wheat maturity and harvest suitability.Timely and accurate acquisition of wheat moisture content is conducive to wheat harvest and production planning,guiding the operation scheduling of combined harvester,and ensuring accurate harvest of wheat in the mature stage.In order to improve the accuracy of online detection system of wheat moisture content in combined harvester,a kind of online detection sensor of wheat grain moisture content with the ipsilateral circular arc capacitance was designed,and its structure and working principle were analyzed by finite element simulation and the structure parameter optimization test of capacitor plate were carried out.Based on COMSOL Multiphysics software,the structural parameters of the ipsilateral circular arc capacitive moisture content detection sensor were optimized,including the number of plates,plate size and plate spacing,and the final optimized parameters were obtained:When the width of the driving plate of the ipsilateral circular arc capacitor tripole plate type wheat grain moisture content detection sensor was 45 mm,the width of the sensing plate was 23 mm,the edge of the plate was 18 mm,and the length of the plate was 135 mm,the linear correlation between the capacitance and the permittivity was satisfied,and the determination coefficient R 2 was close to 1.

关 键 词：含水率 COMSOL 同侧圆弧式电容传感器 在线检测 小麦 

分 类 号：S225.2[农业科学—农业机械化工程]