基于加速度补偿的土壤紧实度测量方法与传感器设计

发布时间：2018-06-08 04:42

本文选题：土壤紧实度 + 传感器　；参考：《农业机械学报》2017年04期

【摘要】：针对目前基于圆锥指数的土壤紧实度测量中,无法消除土壤摩擦力对紧实度测量的影响,要求检测传感器匀速贯入土壤,因此存在使用不便、精度不高的难题。为了提高土壤紧实度实时测量方法的精度及可操作性,在圆锥指数方法基础上,设计了土壤紧实度实时检测传感器,并加入了加速度的同步测量,消除了使用过程中金属杆插入速度不均造成的误差,提高了土壤紧实度测量精度。通过大量试验验证了自制传感器具有较好的静态性能和动态性能,其测量范围为0~900 k Pa,灵敏度为0.041 896,稳定性测量标准差为5 k Pa,测量精度为±0.02%FS,超调量为7.81%,过渡时间为0.632 s。与美国SC-900型土壤紧实度仪对比其准确性的线性拟合决定系数均达到0.96以上,结果表明设计的土壤紧实度传感器与SC-900型土壤紧实度仪在实际测量中性能相当,且使用更方便、价格更低廉。为农林生产、环境保护及生态监测提供了一种具有自主知识产权、精准获取土壤紧实度的有效手段。
[Abstract]:In the current soil compactness measurement based on cone index, the influence of soil friction on compactness measurement can not be eliminated, and the sensor is required to penetrate into the soil at a uniform speed, so there is a difficult problem of inconvenient use and low precision. In order to improve the precision and maneuverability of the real time measurement method of soil compactness, a real time measuring sensor of soil compactness was designed on the basis of cone index method, and the simultaneous measurement of acceleration was added. The error caused by uneven insertion speed of metal rod is eliminated and the precision of soil compactness measurement is improved. A large number of experiments have proved that the self-made sensor has good static and dynamic performance. The measurement range is 0 ~ 900kPa, the sensitivity is 0.041 ~ 96, the standard deviation of stability measurement is 5 kPa. the measuring accuracy is 卤0.02 FSs, the overshoot is 7.81 and the transition time is 0.632 s. Compared with SC-900 type soil compactness meter, the linear fitting determination coefficient of its accuracy is above 0.96. The results show that the performance of the designed soil compactness sensor is comparable to that of SC-900 soil compactness meter, and it is more convenient to use. The price is lower. It provides an effective means for agricultural and forestry production, environmental protection and ecological monitoring to obtain soil compactness with independent intellectual property rights.
【作者单位】：北京林业大学工学院;北京林业大学城乡生态环境北京实验室;
【基金】：国家自然科学基金项目(31371537) 北京市科技计划项目(Z116100000916012) 北京市共建项目专项
【分类号】：S152.9;TP212

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