DEM simulation model to optimise shutter hole position of a centrifugal fertiliser distributor for precise application. (April 2021)

• Record Type: Journal Article
• Authors: Hwang, Seok-Joon; Nam, Ju-Seok
• Is Part Of: Biosystems engineering. Volume 204(2021)
• Page Start: 326
• Page End: 345
• Publication Date: 2021-04
• Subjects: Distribution pattern -- Distribution uniformity -- Optimal solution -- Spinner; Bioengineering -- Periodicals; Agricultural engineering -- Periodicals; Biological systems -- Periodicals; Génie rural -- Périodiques; Systèmes biologiques -- Périodiques; 631
• DOI: 10.1016/j.biosystemseng.2021.02.004
• Languages: English
• ISSNs: 1537-5110

Abstract

Abstract : The purpose of this study is to analyse the distribution pattern of centrifugal fertiliser distributor with two shutter holes and obtain the optimal position of the shutter holes for improved distribution uniformity. A simulation model of the centrifugal fertiliser distributor was generated by discrete element method (DEM). The behaviour of fertiliser particles on the spinner was analysed by the simulation and the simulation model was verified through a stationary distribution pattern test. The distributor design was modified using the verified simulation model to improve the distribution uniformity. The simulation results of the existing fertiliser distributor showed the amount of fertiliser applied on the right side of the machine was 1.59 times higher than the amount applied on the left (R/L ratio) and the coefficient of variation (CV) was 34.88% at stationary condition indicated non-uniform fertiliser distribution. As the position of the shutter holes was moved in the direction of rotation of the spinner (i.e. clockwise) the amount of fertiliser distributed towards the right side decreased. The shutter hole position accordingly adjusted to improve fertiliser distribution uniformity. When the optimal position of the shutter hole was used under stationary condition, the R/L ratio was close to 1.0, whilst the CV value decreased by approximately 50%. The optimal solution was also suitable during continuous application when applying at a width of 8 m since CV values were <20%. Thus the optimal position can be used to improve the distribution uniformity when stationary and moving. Highlights: Shutter hole position of a centrifugal fertiliser distributor optimised for uniform distribution. DEM simulation model was constructed based on actual shape and operating characteristics of the distributor. Distribution mechanism was analysed by simulation and optimal position was found by iterative analysis. Deposit coefficient of variation decreased by ~50% at the optimal position.