联合收获机喂入量监测系统信号分析与处理

Signal Analysis and Processing of Combine Harvester Feedrate Monitoring System

为实现对联合收获机喂入量的准确测量,降低作业环境和机器振动对测量精度的影响,对喂入量监测系统的扭矩信号、转速信号和GPS信号进行了分析与处理方法研究。根据GPS信号格式对其进行了有效信息提取、高斯投影变换和作业参数计算;根据转速脉冲信号计算转速,并对其进行插值;对扭矩信号进行了分析和双阈值滤波,对信号插值方法和降噪方法进行了对比测试。以田间采集喂入量信号为样本,对扭矩信号进行双阈值滤波、插值和降噪,对比了不同插值方法的预测效果和不同滤波方法的降噪效果。结果表明,在样本范围内,分段线性插值和自适应滤波效果优于其他方法,经信号处理后的喂入量测量平均相对误差为12.5%,在一定程度上能够满足联合收获机喂入量监测的实际需要。

Aiming to achieve accurate measurement of the feedrate,reduce the influence of the working environment and the vibration interference of the combine harvester on the measurement accuracy of the feedrate,improve the practical effect of the feedrate monitoring system,and study the feedrate signal processing method,including torque signal filtering noise reduction,GPS signal analysis and operation parameters calculation and speed signal calculation and interpolation,taking the feedrate signal in the field as a sample,the threshold signal was filtered by double threshold,and the prediction effect of different interpolation methods and the noise reduction effects of different filtering methods were compared.The experimental results showed that the piecewise linear interpolation and adaptive filtering were better than other methods in the sample range.The average error of feedrate prediction after data processing was 12.5%,which can meet the actual needs of combine harvester feedrate monitoring to a certain extent.