Banca de DEFESA: AUGUSTO CESAR DE JESUS SANTOS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : AUGUSTO CESAR DE JESUS SANTOS
DATE: 07/12/2022
TIME: 14:00
LOCAL: Online
TITLE:

MAINTENANCE POLICIES FOR ENHANCING SYSTEM SUSTAINABILITY VIA THE DELAY TIME MODEL

KEY WORDS:

Maintenance. Delay time. Reuse. Second-hand items. Industrial waste.

PAGES: 128
BIG AREA: Engenharias
AREA: Engenharia de Produção
SUMMARY:

Although there are many maintenance models and policies that have been developed in the literature of reliability engineering, most take a purely economic perspective and very few consider the environmental aspect of sustainability. Models based on the delay time concept, for instance, have been widely applied in development of maintenance policies for systems with at least one defective state prior to the failure. However, the environmental perspective is generally not taken into account in the modelling, which presents a significant gap in the literature. In addition, new environmental legislation encourages the reuse of components and products. In this context, this thesis develops novel maintenance policies to address the need of reuse of items through delay time modelling. From a theoretical point of view, the novelty lies in the idea of repairing defective items for reuse, to avoid the acquisition of a new item and therefore reducing relevant economic costs, industrial waste, and negative environmental impact. To this end, the thesis proposes methods in determining the maximum level of the defective state for items to be reused and the proportion of items to be reused in the long term, depending on the reliability levels of new and reused items. These considerations in the development of new models make it possible to verify the potential for economic and environmental improvement in contrast with traditional models that do not consider reuse and that simply replace a failed item with a new one. From a practical perspective, the thesis creates novelty by proposing a method of mitigating the problem of generating waste from the disposal of items and equipment. The contribution of this thesis is highlighted in two ways: the expansion of the delay time model beyond the economic perspective traditionally considered and the possibility of mitigating a considerably important problem in the industrial segment. In terms of sustainability, the economic impact refers to the considerable reduction in the maintenance cost of certain systems due to component reuse. The environmental impact is linked to the possibility of reduction of disposal of industrial components. The social impact is related to the discussion that social dimension should be incorporated in maintenance models and policies.

COMMITTEE MEMBERS:
Externo à Instituição - PHILIP ANTHONY SCARF
Interna - 1510962 - CAROLINE MARIA DE MIRANDA MOTA
Presidente - 1549303 - CRISTIANO ALEXANDRE VIRGINIO CAVALCANTE
Interno - 2766188 - MARCIO JOSE DAS CHAGAS MOURA
Externo à Instituição - PHUC DO