单板式冲力谷物测产传感器设计与试验

Design and Experiment of Single Plate Impact Grain Yield Sensor

为了能够适应目前精准农业的治理与发展需求,设计了实时产量检测的单板式冲力谷物测产传感器。为了验证方法的可行性,进行了传感器的受力有限元仿真,形成应力板的受力云图,确定应变片的检测位置。采用惠斯通电桥对应力采集板的形变信号进行采集,并通过CAN发送给上位机。上位机通过无迹卡尔曼滤波(UKF)算法对形变信号处理后,通过标定关系曲线,得到实时的产量信息。应力标定试验,确定了传感器采集的模拟值与冲力的关系曲线;产量标定试验,确定了冲力与产量的关系曲线模型;田块试验,表明该传感器的检测平均绝对误差为4.6%。

In order to meet needs of management and development of precision agriculture,a single plate impact grain yield sensor for real-time yield detection was designed. In order to verify feasibility of the method,finite element simulation of the sensor was carried out,the stress cloud diagram of stress plate was formed,and detection position of strain gauge was determined.Wheatstone bridge was used to collect deformation signal of the stress acquisition board and send it to upper computer through CAN. After deformation signal was processed by unscented Kalman filter( UKF) algorithm,the real-time production information was obtained by calibrating relation curve. Stress calibration test determined relationship curve between analog value collected by sensor and impact;yield calibration test determined relationship curve model between impact and yield;field test showed that average absolute error of the sensor was 4. 6%.