Abstract
Thinning of fruit trees is a manual method commonly used to reduce the totalamount of developing fruit, thus enhancing fruit quality. The development of a suitable methodologycapable of precisely monitor the amount of fruit removed from the trees can lead to a more uniformand automated control of the thinning process. In this study the dynamic response of fruitfulbranches as fruit clusters were gradually removed from a fresh cut peach branch were simulated andexperimentally verified in the Bio-automation Laboratory at the University of California, Davis.Accelerometers were installed at different locations on a peach branch for experimental verificationof the model representing the dynamic behavior of a fruitful branch. Numerical simulations resulting from the application of a finite element method solution to a transient modal analysis problemshowed that the developed model represented the dynamic behavior of the branch well. Discrete fastFourier transform (FFT) was used to process simulated discrete time signal responses generated bythe finite element analysis, and to process signals generated by accelerometers mounted on thebranches. Frequency domain analysis performed on the responses of two accelerometers spaced onthe branch, and on the response of a single simulated accelerometer located at the center of mass ofall fruits along the horizontal direction indicated that a computed parameter called the integral of theamplitude of the simulated spectra correlated well with the cumulative fruit mass removed from thebranch. These simulations produced R2 values of 0.91 and 0.87, respectively. Thus, singleaccelerometer simulation results indicated that no significant reduction in mass removal predictionwould result in practical applications adopting only one accelerometer located at the initial center ofmass of the fruits.
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Claims 4
Claim · model-written summary
The finite element model represented peach branch dynamics well.
Not reportedTaxonComparatorValue
Verbatim
e0“the developed model represented the dynamic behavior of the branch well.”
Claim · model-written summary
A simulated spectral amplitude measure correlated with removed fruit mass, with R2 of 0.91 for two accelerometers.
- Treatment
- two accelerometerse0
- Outcome
- cumulative fruit mass removed from thebranche0
- Direction
- correlated welle0
- Value
- 0.91e0
Not reportedTaxon
Verbatim
e0“Frequency domain analysis performed on the responses of two accelerometers spaced onthe branch, and on the response of a single simulated accelerometer located at the center of mass ofall fruits along the horizontal direction indicated that a computed parameter called the integral of theamplitude of the simulated spectra correlated well with the cumulative fruit mass removed from thebranch. These simulations produced R2 values of 0.91 and 0.87, respectively.”
Claim · model-written summary
The corresponding correlation had R2 of 0.87 for a single simulated accelerometer.
- Treatment
- single simulated accelerometere0
- Outcome
- cumulative fruit mass removed from thebranche0
- Direction
- correlated welle0
- Value
- 0.87e0
Not reportedTaxon
Verbatim
e0“single simulated accelerometer located at the center of mass ofall fruits along the horizontal direction indicated that a computed parameter called the integral of theamplitude of the simulated spectra correlated well with the cumulative fruit mass removed from thebranch. These simulations produced R2 values of 0.91 and 0.87, respectively.”
Claim · model-written summary
Using one accelerometer was predicted to cause no significant reduction in mass removal prediction.
- Treatment
- only one accelerometere0
- Outcome
- mass removal predictione0
- Direction
- no significant reductione0
Not reportedTaxonComparatorValue
Verbatim
e0“no significant reduction in mass removal predictionwould result in practical applications adopting only one accelerometer”