Abstract
The conversion of pig manure into organic fertilizer has become a research hotspot in agricultural engineering, and many types of pig manure processing machinery have been derived. The discrete element method (DEM) can be used in the research of pig manure processing machinery to study the interaction between pig manure and machinery, which makes the research more direct and accurate. In order to introduce the discrete element method into the research of pig manure processing machinery, a reliable parameter basis for discrete element simulation is necessary, taking the angle of repose (AoR) as the reference and based on the hertz-mindlin with JKR contact model and Plackett–Burman experiment design. Three parameters with significant influence on the AoR are screened out from nine parameters related to pig manure. By conducting Box–Behnken experiment design, the quadratic polynomial regression equation between the AoR and three significant parameters is established. According to the parameters predicted by the quadratic polynomial regression equation, the discrete element simulation of AoR is conducted. The simulation result of AoR (38.54°) is close to the experimental result (38.65°) with a relative error of 0.28%, indicating that the regression equation can predict the relevant parameters of pig manure according to the AoR.
Highlights
With the development of animal husbandry and large-scale pig breeding, pig manure emission density has increased in recent years
In the study of pig manure fermenting machine, the finite element method simulation is used to study the fermenting condition of pig manure [5], but the finite element method can only study the temperature of fermenting machine
Since the JKR contact model is proposed, it has been introduced into the simulation study of different kinds of particles by researchers, and the simulation results of these studies are consistent with the experimental results, such as the discrete element model parameter calibration for cohesive soils [8], the study on mechanical drag reduction in paddy field operation [9], discrete element parameter calibration of vermicomposting nursery substrate [10], simulation and experiment of spin-jet lotus root excavator [11], simulation and experiment of mixing efficiency of a concrete ribbon mixer [12] etc
Summary
With the development of animal husbandry and large-scale pig breeding, pig manure emission density has increased in recent years. Taking the discrete element method (DEM) as the study method, it can directly simulate the speed, force, temperature, and motion curve of pig manure, making the research more direct and intuitive. Since the JKR contact model is proposed, it has been introduced into the simulation study of different kinds of particles by researchers, and the simulation results of these studies are consistent with the experimental results, such as the discrete element model parameter calibration for cohesive soils [8], the study on mechanical drag reduction in paddy field operation [9], discrete element parameter calibration of vermicomposting nursery substrate [10], simulation and experiment of spin-jet lotus root excavator [11], simulation and experiment of mixing efficiency of a concrete ribbon mixer [12] etc. With water content as the medium, the change of AoR can reflect the change of contact parameters of pig manure, and realize the discrete element parameters calibration of pig manure. With JKR particle contact model, the discrete element parameters are calibrated
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