农业工程学报2017，Vol.33Issue(10)：287-294,8.DOI:10.11975/j.issn.1002-6819.2017.10.038
基于底面压强的粮仓储量估测方法
Granary storage quantity detection method based on bottom pressure estimation
摘要
Abstract
Automatic detection of granary storage quantity with fast speed and high accuracy is an important technology for national food security. In this paper, according to the characteristics of grain bulk in different granary type (flat warehouse, squat silo and vertical silo), the mathematical relationship between granary storage quantity and the bottom/side pressure of granaries is established, and a new on line model for the grain storage quantity measurement is also proposed. For the given grain and storage type, the storage quantity is only related to the bottom pressure and side pressure on the granary and the grain height in the granary, which makes it possible to measure the storage quantity with pressure sensors; as long as the above pressure value and grain height are determined, the storage quantity can be obtained with high accuracy. According to the measurement requirement on the accuracy and robustness on the grain storage quantity, the pressure sensors are arranged as 2 circles, and each circle includes multiple pressure sensors. There exist the inhomogeneity and randomness of the pressure value on the bottom and side of the granary, and therefore more sensors are needed which can detect the pressure value on the bottom and side with high accuracy. However, the more the pressure sensor used, the higher the cost of measurement system. Based on the tradeoff on the cost and accuracy, the setup of 2 circles is proposed to measure the pressure value with high accuracy. The inner circle which is far from the side wall provides the pressure value on the granary bottom and the outer circle which is close to the side wall provides the pressure value on the granary side. For this method, the setup of 2 circles not only eliminates the inhomogeneity and randomness of the granary pressure value measurement, but also reduces the number of the required pressure sensors. With the pressure values obtained, according to the principle model of the storage quantity measurement, this paper proposes a new model based on polynomial expansion to measure the storage quantity. The model uses the polynomial of the average of the values output by the inner pressure sensors to estimate the bottom pressure value, uses the polynomial of the average of the values output by the outer pressure sensors to estimate the side pressure value, and obtains the grain height based on the above 2 polynomials. The proposed model can obtain the polynomial coefficient and order based on the test sample of the granary storage quantity automatically, which provides the high accuracy on the grain storage quantity measurement based on the pressure sensors. At the same time, the information of granary type such as granary shape and size is also introduced in the model, which improves the practicality for the granary of different types in the proposed model. Real practical storage quantity detection results show that the detection error of the proposed model is less than 2.5%, and the cost is reduced significantly, which demonstrate that the proposed granary storage quantity detection model is effective and well meets the demand of national granary storage quantity detection.关键词
压力/传感器/模型/储粮数量/压力传感器布置/检测精度Key words
pressure/sensors/models/storage quantity/pressure sensor layout/detection accuracy分类
信息技术与安全科学引用本文复制引用
张德贤,张苗,张庆辉,张元..基于底面压强的粮仓储量估测方法[J].农业工程学报,2017,33(10):287-294,8.基金项目
国家科技支撑计划(2013BAD17B04) （2013BAD17B04）
河南省科技厅自然科学项目(172106000013) （172106000013）
粮食信息处理与控制教育部重点实验室开放基金课题(KFJJ2016102) （KFJJ2016102）
国家自然科学基金项目(U1404617) （U1404617）
