平行梁冲量式谷物质量流量传感器信号处理方法

冲量式谷物质量流量传感器是联合收割机测产系统的核心部件,但对振动干扰敏感.在传感器平行梁弹性元件结构优化设计基础上,给出了传感器输出信号的处理方法.设计了动态补偿器来改善传感器动态特性,以克服机械结构阻尼难以大幅度提高弹性元件系统阻尼的问题;设计了自适应陷波滤波器,以消除工作环境中存在的非稳定低频振动干扰;给出了传感器零点动态修正方法,以减少农田地形变化对测量精度的影响.试验结果证明了各算法的有效性,其中大田测产误差小于10%.

Signal processing method for impact-based grain mass flow sensor with parallel beam load cell

Impact-based grain mass senor is a key component of the yield monitoring system, but it is sensitive to the environmental vibration. An impact-based grain mass sensor with parallel beam load cell was designed by the optimization method. Techniques to process the output signal of this sensor were covered in this paper. A dynamic compensation for sensor output was introduced firstly in order to improve the dynamic response of sensor that is generally defective only with the mechanical damping treatment to the load cell. Then an adaptive notch filter was developed to eliminate the disturbance with changeable frequency. Finally, the way to dynamically calculate the zero point of sensor was provided so that the field terrain cannot exert any effect on the yield measurement. The experimental results show that these algorithms were effective, and the error was within 10% when the field test was carried out in Luancheng.