ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

Piezoelectric films were used as sensor sensitive materials. A grain cleaning loss rate monitoring device suitable for corn harvesting was designed. The impact sensor, signal processing circuit and mounting device were designed, and the corresponding processing algorithm was used to collect the impact signal. Firstly, under different experimental conditions of impact angle and height, the impact signal acquisition experiments of different sizes of corn kernels and impurities were carried out. The main characteristics of impact signal were also extracted. Secondly, the support vector machine was used for multi-classification. The model was trained by the support vector machine multi-classification algorithm and real-time classification was implemented on the monitoring device. And the classification model was validated by using different corn varieties and moisture content. Then, under the conditions of different fan speeds and cleaning screen opening degrees, the relationship between the number of grains detected by the sensor and the total loss during the test time was obtained. And the real-time cleaning loss rate was calculated according to the grain flow value. Finally, the monitoring device was mounted on a 4YL-8 combine harvester and field trials were conducted. The results showed that the average relative error of the monitoring device compared with manual detection was 12.98%, which can provide feedback for the control of the harvester.