Abstract

Este estudo tem como objetivo avaliar cinco métodos de previsão para demanda intermitente usando uma série histórica de consumo de peças sobressalentes da aeronave 737 Next Generation, fabricado pela Boeing, da maior frota aérea brasileira gerenciada pela VRG Airline Company S/A. Os métodos de Winter, Croston, Single Exponential Smoothing, Weight Moving Average e Método de Distribuição de Poisson foram testados em um histórico de 53 peças sobressalentes e cada uma delas possui um histórico de demanda de trinta e seis meses (janeiro de 2013 a dezembro de 2015). Os resultados mostraram que os métodos Weight Moving Average, Distribuição de Poisson e Croston apresentaram os melhores ajustes. Além disso, observou-se que a maior parte das demandas por peças sobressalentes apresentaram um padrão smooth ao contrário do resultado obtido pelo estudo de Ghobbar and Friend (2003) que apresentou um padrão lumpy. Por outro lado, tem-se que o Método de Winter apresentou-se como o de pior ajuste em ambos os estudos. Conclui-se que os métodos de Weight Moving Average e Distribuição de Poisson são os mais adequados para avaliar a demanda intermitente para o caso da VRG Airline Company S/A.

Highlights

  • Delays in airline schedules have caused costly consequences to the airline network (AhmadBeygi, Cohn, Yihan Guan and Belobaba, 2008; Papakostas et al, 2010; Wong and Tsai, 2012)

  • The results presented in this study, using a historical series composed of 8ifty-three units, corroborates with the same results presented by Ghoobar and Friend (2003)

  • The methods that obtained the best adjustments for the historical series were the Weight Moving Average (WMA), the Poisson Method and the Croston Method

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Summary

Introduction

Delays in airline schedules have caused costly consequences to the airline network (AhmadBeygi, Cohn, Yihan Guan and Belobaba, 2008; Papakostas et al, 2010; Wong and Tsai, 2012). Delays in airline schedules can be the result of many different causes, i.e., from January 2014 to September 2017, there were 21,533,005 total operations in the US airports with 246,099,313. Delays caused by maintenance are based on poor maintenance services’ planning, failures found during inspections and unavailable of spare parts in stock and unexpected glitches that occur at the time or near the time of the release of the aircraft for 8light (Papakostas, Papachatzakis, Xanthakis, Mourtzis, and Chryssolouris, 2010). Aircraft maintenance plays a signi8icant role in reducing cost, which amounts up to about 13% of the total operating cost (Gu, Zhanga, and Li, 2015)

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