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Master's Dissertation
DOI
https://doi.org/10.11606/D.55.2020.tde-21082020-082044
Document
Author
Full name
Matheus Augusto Fernandes de Assunção
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2020
Supervisor
Committee
Santos, Maristela Oliveira dos (President)
Morabito Neto, Reinaldo
Munari Junior, Pedro Augusto
Nicola, Adriana Cristina Cherri
Title in Portuguese
Problema de Roteamento de Veículos Heterogêneos com Múltiplos Entregadores e Coleta e Entrega Simultâneas
Keywords in Portuguese
Logística
Otimização
Roteamento de veículos
Abstract in Portuguese
O Problema de Roteamento de Veículos com Janelas de Tempo e Múltiplos Entregadores trata de uma modalidade do Problema de Roteamento de Veículos com Janelas de Tempo onde os veículos, ao invés de necessariamente parar em cada cliente em sua rota, podem parar em pontos estratégicos próximos a alguns clientes, de onde a entrega é realizada à pé ou via algum veículo menor. A literatura existente comprova que a adição de múltiplos entregadores pode diminuir significativamente o tempo de entrega. Esse trabalho explora uma nova extensão desse problema, tratando de casos em que os clientes podem necessitar tanto de coleta, quanto de entrega, e a frota é composta de veículos de classes diferentes. Para resolver esse problema foi elaborado um modelo matemático utilizando técnicas de Programação Inteira Mista, e um método de Random Variable Neighborhood Descent. Os resultados encontrados pela heurística são comparados com resultados utilizando somente o solver a partir do modelo matemático, bem como com resultados utilizando a solução encontrada pelo RVND como solução inicial para o solver. Os resultados mostram a vantagem em utilizar o método RVND, pela qualidade das soluções encontradas e pelo tempo computacional necessário para encontrá-las.
Title in English
Simultaneous Pickup and Delivery Heterogeneous Vehicle Routing Problem with Multiple Deliverymen
Keywords in English
Logistics
Optimization
Vehicle routing
Abstract in English
The Vehicle Routing Problem with Time Windows and Multiple Deliverymen describes a variant of the Vehicle Routing Problem with Time Windows in which the delivery vehicles, instead of necessarily stopping at each client, can stop at strategically chosen locations which are close to some of the clients, from where the delivery is done on foot or with a smaller vehicle to those clients. The existing literature shows that adding multiple deliverymen can minimize delivery times. This work explores a new extension of this problem, studying the case where the clients might have pickup and delivery needs, and the fleet is composed of different classes of vehicles. In order to solve this problem, a mathematical model using Mixed Integer Programming Techniques, and a Random Variable Neighborhood Descent method were developed. Results obtained by the heuristic are compared with results found using only the solver with the mathematical model, and also with the solutions obtained by using the solution found by the RVND as an initial solution for the solver. The results show a clear advantage in using the RVND method, for the quality of its solutions, and the computational time needed to find them.
 
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Publishing Date
2020-08-21
 
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