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A Grain Flow Model to Simulate Grain Yield Sensor Response

View Article: PubMed Central - PubMed

ABSTRACT

The objective of this study was to develop a flow model for grain combines based on the laboratory and field response of an impact based grain flow sensor. The grain flow model developed in this study is of first order with constant coefficients. A computer code was written to solve the model and to simulate the response of a yield sensor whose response had been determined previously for various types of flow rate inputs both in field and laboratory experiments. The computer program for the simulation can also compensate for the time delay. The simulation results of the theoretical model suited well to the experimental data and showed that the model effectively shows the input-output relationship of grain flow through a grain combine. This model could be used for periodic flow signals acquired from grain yield sensors. It was concluded that the model postulated in this study could be further developed to determine the grain yield entering the combine using the outlet flow rate measured by a yield sensor.

No MeSH data available.


Grain flow signal as measured by a yield sensor for step changes in grain flow in a laboratory experiment [12].
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f4-sensors-08-00952: Grain flow signal as measured by a yield sensor for step changes in grain flow in a laboratory experiment [12].

Mentions: The common feature of the graphs from the laboratory and field experiments is the exponential increases and decreases observed in the beginning and at the end of the tests. This shows that the combine itself behaves like a first order sensor due to the accumulation of grain inside the combine at the beginning of a harvest strip and at sudden yield changes as the harvest continues. Therefore the flow model should be able to simulate field or laboratory responses shown in figures 3 and 4. The simulation result for the unit step response for the theoretical model as shown in fig. 2 was similar in shape to the experimental results in that the output does not rise immediately to follow the input but rounds up.


A Grain Flow Model to Simulate Grain Yield Sensor Response
Grain flow signal as measured by a yield sensor for step changes in grain flow in a laboratory experiment [12].
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3927513&req=5

f4-sensors-08-00952: Grain flow signal as measured by a yield sensor for step changes in grain flow in a laboratory experiment [12].
Mentions: The common feature of the graphs from the laboratory and field experiments is the exponential increases and decreases observed in the beginning and at the end of the tests. This shows that the combine itself behaves like a first order sensor due to the accumulation of grain inside the combine at the beginning of a harvest strip and at sudden yield changes as the harvest continues. Therefore the flow model should be able to simulate field or laboratory responses shown in figures 3 and 4. The simulation result for the unit step response for the theoretical model as shown in fig. 2 was similar in shape to the experimental results in that the output does not rise immediately to follow the input but rounds up.

View Article: PubMed Central - PubMed

ABSTRACT

The objective of this study was to develop a flow model for grain combines based on the laboratory and field response of an impact based grain flow sensor. The grain flow model developed in this study is of first order with constant coefficients. A computer code was written to solve the model and to simulate the response of a yield sensor whose response had been determined previously for various types of flow rate inputs both in field and laboratory experiments. The computer program for the simulation can also compensate for the time delay. The simulation results of the theoretical model suited well to the experimental data and showed that the model effectively shows the input-output relationship of grain flow through a grain combine. This model could be used for periodic flow signals acquired from grain yield sensors. It was concluded that the model postulated in this study could be further developed to determine the grain yield entering the combine using the outlet flow rate measured by a yield sensor.

No MeSH data available.