RESUMO Objetivou-se com esta pesquisa analisar a viabilidade econômica na fabricação de esquadrias em uma carpintaria, mediante dois cenários de produção, antes e após modelagem pela pesquisa operacional. Quantificou-se os custos e receitas anuais, sendo estes projetados para um horizonte de 30 anos. A análise econômica contemplou o Valor Presente Líquido (VPL), Valor Periódico Equivalente (VPE) e a Razão Receita/Custo (R/C). Após análise da produção padrão da carpintaria, aplicou-se a modelagem para maximização do lucro com base no quantitativo de cada sortimento a ser produzido. A produção padrão mostrou viabilidade para todos indicadores, todavia a implementação da pesquisa operacional proporcionou aumento de 57,54 % para os indicadores VPL e VPE e de 11,29% para a R/C. Aplicando-se a análise de sensibilidade após a modelagem, percebeu-se que mesmo com aumento de 10% nos custos de mão de obra ou no preço da madeira, o valor obtido para o indicador VPL foi superior quando comparado ao cenário padrão, antes da modelagem e sem aplicação da análise de sensibilidade.

ABSTRACT This study aimed to analyze the economic feasibility of manufacturing frames in a carpentry company through two scenarios, including the production before and after modeling using operational research. The annual costs and revenues were quantified considering a horizon of 30 years. The economic analysis included the following criteria: Net Present Value (NPV), Equivalent Periodic Value (EPV) and Revenues Cost Ratio (R/C). The modeling was applied after analysis of the standard production using an objective function to maximize the company’s profit based on the quantity of each assortment to be produced. The standard production showed economic feasibility for all evaluated indicators, however implementing the operational research provided an increase of 57.54% for the NPV and EPV indicators, and 11.29% for the R/C ratio. In applying the sensitivity analysis after modeling, it was noticed that the value obtained for the NPV indicator was higher, even with a 10% increase in labor costs or in the price of wood, when compared to the standard production scenario before the modeling and without applying sensitivity analysis.

ABSTRACT The objective of this work was to use the geotechnology study as a planning tool in determining the costs of forest extraction. The research was carried out in areas of the Forest Company that operates in the southern region of Bahia, Brazil. The work was developed in two stages, the first corresponding to the determination of production costs of the forwarder and the second in the machine’s productivity, taking as parameter the project area and the distance of extraction. The proposed methodology allowed to estimate with precision the distance of extraction, being this variable of great influence in the costs of forest extraction. The evaluated project presented 256.30 hectares of eucalyptus plantation, divided into 10 plots, with an extraction mean distance of 200 meters. According to the study, it would require the value of US$ 102,575.33 for the extraction of the wood from the project evaluated.