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Mechatronic System for Automatic Harvesting of Cucumbers

Autor: P. Wennekes, L.M. van Kollenburg-Crisan, J. Bontsema

Publikováno v: IFAC Proceedings Volumes. 31:289-293

The two main goals of this research are the development of a harvesting robot and the improvements brought in the present high-wire cultivation cucumber plant system. The mobile robot consists of a vehicle for course positioning of the robot, a manip

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::41d6d16bf054b97970971a0b1c1e3c26
https://doi.org/10.1016/s1474-6670(17)36079-2

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Modelling and simulation for control of nutrient application in closed growing systems

Autor: T.W.B.M. Bouwmans, Th.H. Gieling, J. Bontsema, R.H. Steeghs

Publikováno v: Netherlands Journal of Agricultural Science, 45, 127-142
Scopus-Elsevier
Netherlands Journal of Agricultural Science 45 (1997)

The design of a controller for water supply and nutrient application in closed growing systems is presented and discussed with reference to nutrient film techniques in a 150 msuperscript 2 greenhouse. The 'robust design' method aims to distinguish be

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cd19ba3dcaf5891f5d42a58fedce1e91
https://doi.org/10.18174/njas.v45i1.530

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Mechanical weed control in sugar beet growing: The detection of a plant in a row

Autor: J. Bontsema, K. Pleijsier, T. Grift

Publikováno v: Mathematical and control applications in agriculture and horticulture, Y. Hashimoto, W. Day (eds.). IFAC workshop series no. 1. Pergamon Press, Oxford, UK

The detection of the position of an individual plant in a row of sugar beet is discussed. Precise detection of the position is necessary for efficient mechanical weed control in the row in the growing of sugar beet. It is shown that with a simple sen

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::76886b510d7a2cff9ad928ad82d40a04
https://doi.org/10.1016/b978-0-08-041273-3.50041-0

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Determination of F r and K d from the solution of the equation of motion of a cyclist

Autor: J Bontsema, W Hennekam

Publikováno v: European Journal of Physics. 12:59-63

The equations of motion of a cyclist are solved for two simple cases of freewheeling (on a level road and on an inclined surface respectively), considering only the rolling friction, air resistance and gravity. Practical tests on a bicycle to determi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::79957bfd826e85c906029a7acad2bad1
https://doi.org/10.1088/0143-0807/12/2/001

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Comparison of robustly stabilizing controllers for a flexible beam model with additive, multiplicative and stable factor perturbations

Autor: Hinke M. Osinga, C.R. Kuiper, J. Bontsema, Ruth F. Curtain

Publikováno v: Analysis and Optimization of Systems: State and Frequency Domain Approaches for Infinite-Dimensional Systems ISBN: 9783540561552

In controlling flexible space structures one always encounters the problem that the control design is based on an inaccurate model. The inaccuracy in the models are for instance unknown damping, neglected dynamics and inaccuracy in the position of ac

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b41bb9bb2f4255f5b215b555d366a36a
https://doi.org/10.1007/bfb0115038

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Toward an optimal control strategy for sweet pepper production 2. optimization of the yield pattern and energy efficiency

Autor: E.J. van Henten, F. Buwalda, H.F. de Zwart, A. de Gelder, J. Hemming, J. Bontsema

Publikováno v: Proceedings of the Third International Symposium on Models for Plant Growth, Environmental Control and Farm Management in Protected Cultivation (HORTIMODEL2006)
Proceedings of the Third International Symposium on Models for Plant Growth, Environmental Control and Farm Management in Protected Cultivation (HORTIMODEL2006). Leuven, Belgium: ISHS

Sweet pepper production is characterized by large fluctuations in fruit yield in time. These fluctuations have a detrimental effect on the operational planning of labor at nursery level as well as on the efficiency of the supply chain. At the same ti

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6f1bf87820f84aef110810bc4ef3c378
https://research.wur.nl/en/publications/toward-an-optimal-control-strategy-for-sweet-pepper-production-2-

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Robustness of flexible structures against small time delays

Autor: S.A. de Vries, J. Bontsema

Publikováno v: Scopus-Elsevier

The authors give transfer matrices for some models described by partial differential equations. From these transfer matrices the poles and zeros are easily derived. The effect of a small time delay in the feedback loop is considered, and it is shown

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f4525f8c9e97f2284c212af954640d57
https://doi.org/10.1109/cdc.1988.194607

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