Dynamic analysis for kernel picking up and transporting on a pneumatic precision metering device for wheat

Abstract

The objective of this study was to theoretically investigate the factors affecting kernels during picking up and transporting stage using a pneumatic precision metering device designed especially for wheat precision seeding and correlates findings with the results from practical testing under laboratory conditions using a test stand with camera system.  The results from dynamic analysis were found to be corresponding with that of the laboratory testing.  The findings revealed that the performance indices, such as quality of feed index (QFI), multiple index (MULI) and miss index (MISI), were obviously influenced by changing the negative pressure force F_Q and rotating speed ω.  The result from test stand highlighted that when the negative pressure increased the QFI increased, MULI increased and MISI decreased, however, the QFI decreased and MISI increased with increasing the rotating speed.  The dynamic analysis likewise revealed that increasing the friction index tanα_g by choosing a suitable material with high friction angle α_g for seed plate as well as enlarging the seed hole diameter could improve the efficiency of the negative pressure force F_Q.

Keywords: wheat, kernel, picking up, transportation, dynamic model, precision metering device