Dynamic deposition pattern simulation of modulated spraying

L. Tian, J. Zheng

Research output: Contribution to journalArticlepeer-review


A modulated spraying nozzle control (MSNC) system can be used to adjust chemical application rates without changing droplet size or the spray pattern across the boom. This laboratory simulation study was conducted to determine the spray pattern of an MSNC system along the sprayer travel direction under different travel speeds. A discrete accumulate method was developed to determine both the spatial and temporal spray pattern for the entire spraying area. Both DG8004VS and DG11004VS flat fan nozzles were tested under four different application rates (25%, 50%, 75%, and 100%) with a travel speed range of 4 to 16 km/h. The 2D spatial spray patterns were generated to demonstrate the MSNC system spraying performance. The coefficient of variation (CV) of spray deposition was measured along the direction of travel. The results show that the MSNC system is suitable for current ground speed compensation rate control applications. If wide fan angle nozzles are used, the CV along the travel direction could be lower than that across the boom.

Original languageEnglish (US)
Pages (from-to)5-11
Number of pages7
JournalTransactions of the American Society of Agricultural Engineers
Issue number1
StatePublished - Jan 2000


  • Control systems
  • Flow rate
  • Spatial pattern
  • Temporal variation
  • Variable rate application

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)


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