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United States Department of Agriculture

Agricultural Research Service

Research Project: DEVELOPMENT OF A STATISTICAL SIMULATION TO ANALYZE INFLUENCING SPRAY DEPOSITION FOR AERIAL CHEMICAL APPLICATION

Location: Crop Production Systems Research Unit

2012 Annual Report


1a.Objectives (from AD-416):
Develop a new method based on control systems simulation for analysis of impact of various factors on in-swath and downwind deposition for improvement of efficiency in aerial chemical application.


1b.Approach (from AD-416):
A new method is proposed to provide valuable information about the significant level of the impact from many factors influencing spray deposition. The most significant factors will be identified using statistical analysis based on the simulation results. With this method the detailed relationship between the total deposition and impact factors such as wind speed, droplet size, and spray release height will be characterized. This characterization will not require actual field testing, but will subsequently be verified under field conditions. Robust results from the simulation will allow determination of optimal droplet size and spray release height that factors in wind speed and direction, providing guidelines for the applicator to achieve the best spray result. The method will be developed based on an existing prototype developed at Texas A&M University (TAMU), for simulation and robustness analysis of dynamic systems. The prototype was originally developed for control system design and analysis. A first principle or black-box model is used to build a simulation model. Based on the simulation result, the main factors that contributed to the system performance are identified using Design of Experiment (DOE). A robust solution can be derived to reduce system variation using Response Surface Method (RSM). The robustness of the new design can be verified using the simulation model. For system test and evaluation, the results of the developed method will be compared with actual field data, and could be used as a guideline for the applicators to achieve best spray result.


3.Progress Report:

A simulation-based Design of Experiments (DOE) method was applied to study the impact of various factors on in-swath and downwind deposition for improvement of efficiency in aerial chemical application. The most significant factors were identified using statistical analysis based on the simulation results. Using this method the detailed relationship between the total deposition and impact factors such as wind speed, droplet size, and spray release height were characterized. Wind speed, droplet size, release height, and swath offset were the factors that had major impact on the downwind deposition and a near-optimal solution was derived. Several useful graphs were generated to allow determination of optimal droplet size and spray release height that factors in wind speed and direction, providing guidelines for the applicator to achieve the best spray result.


Last Modified: 7/28/2014
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