Original papers: Grain separation loss monitoring system in combine harvester
Original papers: Grain separation loss monitoring system in combine harvester
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DOI：
10.1016/j.compag.2011.01.016
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发表时间：
2011-05
影响因子：
8.3
通讯作者：
Zhan Zhao;Yaoming Li;Jin Chen;Jiaojiao Xu
中科院分区：
文献类型：
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作者：
Zhan Zhao;Yaoming Li;Jin Chen;Jiaojiao Xu
基于切向给料轴向脱粒试验台的室内实验结果，建立了脱粒转子轴向和径向的分离粒累积分布函数。在分析凹下区域颗粒分离损失与颗粒分离通量关系的基础上，提出了一种颗粒分离损失的间接监测方法。以压电型聚偏氟乙烯（PVDF）薄膜为敏感材料，设计了一种颗粒磁通传感器。监测区域内分离的颗粒和非颗粒材料（MOG）对压电PVDF薄膜产生影响时，会产生不同的电荷。信号经电荷放大器处理、频辨和整形后，由单片机实现粒数统计，实时测量联合收割机的粒分离损失。田间试验结果表明，监测系统记录的分选损失与人工检测的分选损失相比误差小于12%。
Based on laboratory experimental results obtained with an axial threshing test-rig with tangential feeding, cumulative distribution functions of separated grain in axial and radial directions of threshing rotor were built. Based on the analysis of the relationship between grain separation loss and grain separation flux in an area under the concave, an indirect grain separation loss monitoring method is presented in this paper. Piezo-electric polyvinylidene fluoride (PVDF) film was selected as sensitive material to design a grain flux sensor. While grain and material-other-than-grain (MOG) separated in the monitoring area impact on piezo-electric PVDF films, different electric charges are generated. After signal progressing with a charge amplifier, frequency discrimination and wave shaping, the number of grain can be counted by a microcontroller (MCU) and the grain separation loss of combine harvester can be measured in real-time. Field test results indicated that the measurement errors of grain separation loss recorded by the monitoring system relative to the loss checked manually were less than 12%.