Experimental study on in-situ tilling plow in facility agriculture based on discrete element method
In view of the problem that the arable plough could not be used for deep ploughing due to the narrow space of facility agriculture and the serious soil diseases and insect pests,a method of turning soil on the spot was put forward.Based on the reverse engineering,the reverse surface of the plough body of the local soil turning plough was obtained.Based on the existing forming principle of the plough body,the forward surface of the plough body of the share plough body was established by referring to the ploughing width,ploughing depth,installation angle of the plough body,soil cutting angle,guiding curve lifting angle,opening and length of the plough body.The soil relative humidity was 34.57%and the soil accumulation angle was 39°.The contact parameter range was obtained by GEMM,the contact parameter database of EDEM software.The surface energy between soil particles was 4.19 J/m2,the collision recovery coefficient was 0.282,the dynamic friction coefficient was 0.051,and the static friction coefficient was 0.629.The concept of soil fall rate in original gully was introduced.The interaction model between soil fall rate and surface parameters was established,and the optimal surface parameters of soil fall rate were obtained.Using Design-Expert software,plackett-Burman experimental design method was used to carry out multi-factor and two-level significance screening test with soil fall rate as the response index.Three significant factors affecting soil fall rate of the original ditch were obtained,namely,plow width,plowshare installation angle and soil cutting angle.Box-Behnken experimental design was carried out for the three factors,and the optimal design parameters of 278.392 mm plow width,40.522°plow share installation angle and 23.211°soil cutting angle were obtained.Based on the optimized results,the error between the experimental results and the predicted results is 3.13%.The experimental results show that the tilling plow can achieve the aim of tilling in situ,and provide a reference for solving the problem of soil deep tilling in facility agriculture.
agricultural engineeringin-situ tilling ploworthogonal testsoil falling rate of original ditchphysical test
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