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Mathematical model for improved mass flow estimation in the feeder housing of a forage harvester

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Title: Mathematical model for improved mass flow estimation in the feeder housing of a forage harvester
Author(s): Lin, Janglih
Advisor(s): Dankowicz, Harry
Department / Program: Mechanical Sci & Engineering
Discipline: Mechanical Engineering
Degree Granting Institution: University of Illinois at Urbana-Champaign
Degree: M.S.
Genre: Thesis
Subject(s): forage harvester feeder housing feed rollers discrete element modeling mathematical model
Abstract: For the implementation of precision agriculture practices, accurate yield maps are needed. These yield maps depend on accurate mass flow measurements made during harvest, measurements that are difficult to make because of variability in yield and crop conditions within each field. One way to estimate mass flow rate in a self-propelled forage harvester is to measure the displacement of feed rollers as material enters the machine. In this work, a mathematical model that captures the interaction between the feed rollers and the incoming material was developed to improve the accuracy of the mass flow estimation. The model was developed based on physical principles, various material compaction models, and discrete element method simulations. When tested with experimental data, the model performed better than the current sensor system for some parameter sets, and as well as the current sensor system for others. Because of the mathematical complexity of the full dynamic model, and in order to reduce computation time, a reduced order quasi-static polynomial model was developed to approximate the relationship between feed roller displacement and mass flow rate. Finally, the perturbation induced learning technique was investigated as a method to real-time calibration of model parameters.
Issue Date: 2012-06-27
URI: http://hdl.handle.net/2142/32084
Rights Information: Copyright 2011 Janglih Lin
Date Available in IDEALS: 2012-06-27
Date Deposited: 2012-05
 

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