摘要 针对联合收获机稻谷含水率实时检测过程中因样本含杂率高而导致精度和稳定性差的问题,搭建了兼具二次筛分除杂功能的稻谷实时采样台架,基于采样台架采用电容法设计了联合收获机稻谷含水率在线检测系统。设计了检测系统硬件电路,开发了上位机监控界面,实现了上位机和下位机之间的通信。分析了温度和含杂率变化对电容差值的影响规律,进行了采样台架性能试验,建立了电容差值、温度和稻谷含水率输出的关系模型,其二阶模型决定系数为0.986 6,并对模型进行了验证。结果表明:采样台架筛分后的稻谷含杂率均小于1.2%;室内试验时,检测系统最大误差为0.42%,平均误差为0.22%,检测装置平均相对误差不大于1.25%;田间试验时,检测装置相对误差小于3%,有效提高了在线检测精度。本研究可为稻谷含水率的在线获取提供参考。 In order to solve the poor accuracy and low stability problems of the real-time measurement system of paddy rice moisture content in combine harvester,a real-time sampling platform for paddy rice was set up,based on which the real-time measurement system of paddy rice moisture content in combine harvester was designed by capacitance method.The hardware circuit of the detection system was designed and the monitor interface of the master computer was developed to realize the communication between the master computer and the slave computer.The master computer can display and store monitoring information in real time.The influence of temperature and impurity rate on capacitance difference was analyzed and the performance of the sampling platform was verified.The relation models of capacitance difference,temperature and paddy rice moisture content output were established.The coefficient of determination was 0.9866,and the model was verified.The results showed that the impurity ratio of paddy rice was less than 1.2%after sieving by sampling platform.The maximum error of the detection system in laboratory testing was 0.42%,the average error was 0.22%,the average relative error of the detection device was no more than 1.25%.In the field validation test,the relative error of the detection device was less than 3%,which effectively improved the accuracy of on-line detection.The research result can provide a reference for on-line access of paddy rice moisture content.
机构地区 东北农业大学工程学院
出处 《农业机械学报》 EI CAS CSCD 北大核心 2021年第3期143-152,共10页 Transactions of the Chinese Society for Agricultural Machinery
基金 国家现代农业产业技术体系岗位科学家项目(CARS-01-44) 黑龙江省现代农业产业技术协同创新体系岗位专家项目。
关键词 联合收获机 稻谷含水率 二次筛分除杂 电容法 在线检测 combine harvester paddy rice moisture content secondary screening and impurity removal capacitance method on-line detection
