Design and performance analysis of indoor calibration device for the forcemeasuring system of the tractor three-point hitch  

作　　者：Dong Dai Du Chen Xu Mao Yawei Zhang Yutong Li Shumao Wang Bin Zhang 

机构地区：[1]Department of Mechanical and Electrical Engineering,College of Engineering,China Agricultural University,Beijing 100083,China [2]Department of Mechanical Design and Manufacturing,College of Engineering,China Agricultural University,Beijing 100083,China [3]Beidahuang Agricultural Service Group Heilongjiang Agricultural Machinery Service Co.,Ltd,Harbin 150090,China

出　　处：《International Journal of Agricultural and Biological Engineering》2023年第3期47-54,共8页国际农业与生物工程学报（英文）

基　　金：This work was financially supported by the project of agricultural machinery R&D,manufacturing,promotion,application,and integration;and the 13th Five-Year Plan National Key Research and Development Program of China(Grant No.2016YFD0700102).

摘　　要：The real-time monitoring of the load in farming by the sensor installed on the tractor's three-point hitch can effectively improve the farming efficiency and force-position combined control,reduce the compaction risk of the wheel on the soil and reduce the fuel consumption in farming process.However,the measurement and quantification of the loads on the three-point hitch have some problems remaining unresolved:testing the accuracy and reliability of a load measuring system is hard when the tractor works in a field,the mathematical model of spatial forces usually lacks a practical and effective validation,and the calibration process of the measurement system is inconvenient and incomplete while easily causing a low accuracy.Specifically,this paper builds a new spatial-force mathematical model based on the geometry of a three-point hitch.To eliminate the discrepancy of the geometric model with the actual structure and to refine the mathematical model,a calibration process is conducted by developing a calibration bench,which is equipped with a data acquisition system and a multi-parameter monitoring interface.The three-point hitch installed on this calibration bench is subject to steady-state loading.The loading force,angle of the lower drawbar,and three-component forces(three shaft pin sensors’forces)of the three-point hitch are well measured.With applying for the measured data to calibrate the theoretical mathematic model eventually derives the resultant force from all the three-component forces,a dynamical loading bench was developed to test the calculated resultant force for the three-point hitch during the sinusoidal and randomly variant dynamical loadings tests.A hitch force measurement system is also developed to collect real-time data and calculate the resultant force of measured three-component forces through the calibrated mathematical model.The results of the dynamical loading tests show that the average relative error MRE=1.09%with an average force measurement time delay beingΔt=0.5 s,the root mean sq

关 键 词：TRACTOR three-point hitch hitch force calibration bench hitch force measurement system dynamic loading verification method 

分 类 号：O57[理学—粒子物理与原子核物理]