Mass Flow Measurement System of Granular Fertilizer Based on Microwave Doppler Method

被引：0

作者：

Yang L. ^{[1
]}

Huang J. ^{[1
]}

Zhang J. ^{[1
]}

Hu H. ^{[1
]}

Liu G. ^{[1
]}

Lü S. ^{[2
]}

机构：

[1] Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing

[2] Chinese Academy of Agricultural Mechanization Sciences, Beijing

来源：

Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2020年 / 51卷

关键词：

Fertilizer mass flow; Measurement system; Microwave Doppler method;

D O I：

10.6041/j.issn.1000-1298.2020.S1.024

中图分类号：

学科分类号：

摘要：

In order to achieve accurate measurement of fertilizer mass flow, a mass flow measurement system based on microwave Doppler method with a method for suppressing vibration interference was proposed. The velocity and concentration of the fertilizer particles were obtained from the Doppler signal of the granular fertilize, which was processed by using the fast Fourier transform, and the product of the velocity and concentration was defined as the sensor output value. Then, a linear regression model of the sensor output value and fertilizer mass flow was established by using the least squares method. By analyzing the statistical law of the signal, the five times mean value of power spectral density was used as the threshold to distinguish interference and signal. The fertilizer mass flow was changed by changing the rotating velocity of the fertilizing shaft. For laboratory environment, the mass flow of two types of fertilizers was measured. The experimental results showed that for two types of fertilizers, the max measurement value of the system can reach 2 629.9 g/min, and the relative errors of the microwave method were not more than 5%. In addition, the measurement system was installed on the fertilizing machine. An experiment was carried out by using the third type of fertilizer on the cement road beside the farmland. The analysis showed that the interference caused by vibration made the relative errors of measurement larger. The maximum relative error reached 21.57%. In order to improve the measurement accuracy, the proposed vibration interference suppression method was used. After the interference suppression, the fertilizer mass flow measurement range was between 1 429.1 g/min and 2 976.9 g/min, and the relative error was not more than 10.04%. The constructed system can accurately detect the mass flow of different fertilizers in the laboratory and under fertilizing machine conditions. © 2020, Chinese Society of Agricultural Machinery. All right reserved.

引用

页码：210 / 217

页数：7

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