Desenvolvimento de um modelo de simulação para auxiliar o gerenciamento de sistemas de corte, carregamento e transporte de cana-de-açúcar
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Data
2006-02-20Autor
Silva, João Eduardo Azevedo Ramos da
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Brazil is the greatest producer of sugar cane in the world. The 2004/2005
harvest season processed 360 million ton of sugar cane produced in 5.4 million hectares.
The business related to this activity is responsible for 3 million direct and indirect jobs
and much of Brazilian economy depends on this supply chain, from fertilizer and
machine suppliers to final products delivery to their markets. The continuous feeding of
sugar cane mills during the harvest season depends much on the management of
harvesting, loading and transport operations of sugar cane from the farms to the mills.
This delivery of sugar cane must be guaranteed to avoid the risk of stopping the
industrial production of sugar and alcohol. This work focuses the development of a
simulation model and its use as a management tool to evaluate the working shifts of
agriculture machines operators of a sugar mill at São Paulo State. At first, this
operations research technique is presented as a decision-making tool because it enables
a previous evaluation before its implementation. In sequence, cutting, loading and
transportation operations are described as well as the restrictions that bring difficulties
to its management. Finally, the computer model developed is shown. It was used to
evaluate and select the suitable working shift system regarding the requirements of cane
delivery, the risk of lack of cane and the restriction of the daily working shift hours,
established by labor legislation. Four scenarios were selected to evaluation. The first
scenario considers all operators shift at 7:00 and 19:00 h (main schedule). The other
scenarios consider a two, four and six hour delay of one of the cutting, loading and
transportation teams in comparison to the main schedule. The model was efficient to
represent the real system and much information was gathered to subsidize the decision.
The scenario that considers a four hour delay of a team was select as the best as it
reached most of the requirements of cane delivery, working hours limit and risk of lack
of cane. The discussion is focused in the selected case, but similar works can be
conducted to other sugar and alcohol mills or even to other processes of sugar and
alcohol production system.