Sensor for monitoring rice grain sieve losses in combine harvesters
Sensor for monitoring rice grain sieve losses in combine harvesters
复制标题
用于监测联合收割机稻谷筛损失的传感器
DOI：
10.1016/j.biosystemseng.2016.03.008
复制
发表时间：
2016-07-01
影响因子：
5.1
通讯作者：
Zhao, Zhan
中科院分区：
文献类型：
--
作者：
Liang, Zhenwei;Li, Yaoming;Zhao, Zhan
谷物筛损是评价联合收割机清洗鞋性能的重要参数。为了将颗粒筛损控制在可接受的范围内，研制了一种冲击式压电传感器进行实时监测。根据水稻颗粒和短秸秆颗粒的物理性质，建立了它们的物理模型，并进行了离散元法（DEM）模拟，以了解它们与传感器的碰撞行为。详细分析了颗粒形状、秸秆长度和冲击角对最大法向接触力和力上升时间变化的影响。法向碰撞力和力上升时间的不同，导致信号频率和电压幅值的相应差异。设计了一种信号处理电路，主要由带通滤波电路和电压比较器电路组成，用于全颗粒的判别。现场测试结果表明，传感器记录的测量误差与手动测量结果相对照
Grain sieve losses are important parameters to judge the performance of cleaning shoes in combine harvesters. To keep grain sieve loss within acceptable limits, an impact-type piezoelectric sensor was developed for real-time monitoring. Rice grain and short straw particle models were established according to their physical properties, and discrete element method (DEM) simulations were carried out to understand their collision behaviour with the sensor. The influence of grain shape, straw length and impact angle on variations of the maximum normal contact force and force rise-time were analysed in detail. Differences in normal collision force, and force rise-time occurred which lead to corresponding differences in signal frequency and voltage amplitude. A signal processing circuit, which mainly consisted of a band-pass filter circuit and a voltage comparator circuit, was designed to discriminate for full grains. Field tests results indicated that measurement errors recorded by the sensor and checked against manually measurements were