| Compared with cars,the main power consumption of agricultural machinery,for example tractors,is in the operation of agricultural tools.Due to the complexity of load changes,such as field soil and terrain changes,different crop growth conditions and field humidity changes,plus weeds and other factors,the matching of agricultural machinery locomotives is much more complicated than the use of vehicles.Therefore,the measurement and analysis of the load data on the tractor’s Power Take-off(PTO)shaft is crucial to determine the performance development goals of the engine and improve the tractor’s performance during field operations.In this paper,a data collection system for the tractor rotary tillage operation load is designed.The data collection system is used to conduct field tests on the rotary tillage operation load;the load spectrum compiled for the working load collected by the test is designed for the design of the tractor,engine and rotary tiller Provide theoretical support for matching and gear selection during field operations.The main research contents and conclusions of this article are as follows:(1)The power transmission during the rotary tilling operation of the tractor was analyzed,and it was determined to use the load data on the PTO shaft as the loaded data of the rotary tiller.A specific scheme was designed for the work-load data collection test of the rotary tiller.To measure the load acting on the PTO shaft,a load collection system was installed on the tractor.The system consists of a strain sensor that collects torque on the PTO power output shaft,a speed sensor,a dynamic signal acquisition analyzer,and data analysis software.On the dry land with the same soil conditions,the sliding test,walking,and steering test were carried out,and the rotation farming was carried out at three ground forward speeds and two PTO shaft rotation speeds.(2)The load data collected by the experiment were subjected to data extraction,work area division and outlier removal preprocessing operations.Ensure the validity and reliability of the data used to compile the load spectrum.The load signal data after the preprocessing operation was tested for stationarity characteristics and various ergodic tests to ensure the stationarity characteristics of the load signal in the stable operation area,which provided theoretical support for frequency expansion in the preparation of the load spectrum of the rotary tillage operation.(3)The three-point rain current cycle counting method is used to count the load signal data,and the amplitude-frequency histogram,mean-frequency histogram and average amplitude-of the load signal data under various working conditions of rotary tillage are obtained.Frequency 3D histogram.Using the cycle frequency statistical data,the two-dimensional load spectrum of the rotary tiller under various working conditions was compiled.Finally,the wave center method was used to obtain a onedimensional load spectrum that can be used for laboratory test loading.(4)The effects of three ground forward speeds and two PTO shaft rotation speeds on the engine and PTO power output shaft are analyzed.When the vehicle speed is too high,the rotary tiller slips on the soil without complete tillage.Although the ground speed is increased,the transmission load on the PTO shaft is reduced,and the effect of rotary tillage becomes poor. |
