Characterization of the state of health of a complex system at the end of use.

Caractérisation de l'état de santé d'un système complexe en fin d'utilisation.

Christian Berenger WANDJI WOUAPI (1) , Helmi Ben Rejeb (1) , Peggy Zwolinski (1)

1 G-SCOP_CPP - Conception Produit Process

The state of health (SoH) of an end-of-life product is one of the levers for optimizing the circular economy (CE) process in order to allow the product life-extension. Many approaches have been developed in the literature to estimate the SoH of a complex system (CS). In this study, we asked ourselves the following two questions: First, how to optimize the circular lifecycle scenarios of the components of a product at its end of life? And second, how to estimate the SoH of a product at the end of its life? To answer these questions, we proceeded as follows. First of all, the state of health of a product needs to be considered as an important parameter as well as performance or reliability. To estimate the SoH, it is necessary to identify the product parameters to be observed. The problem here is to choose the most relevant parameters among all those available for a CS. To do this, we have proposed a conditional-based maintenance approach (CBM) which consists in establishing the fault tree of a product. It consists of functionally breaking down a product into its various components and identifying the main failures for each of them. Then, these failures are used to identify the parameters to be monitored. Second, based on the most relevant parameters, the health indicators needed to estimate the SoH of the product are obtained. Then, the Prognostic and Health Management approach (PHM) is proposed in order to estimate the SoH. In the objective of providing a general solution that could be used for estimating the health status of any product, we have proposed a generic framework for the PHM approach. It serves as a guide in choosing the right approach according to the situation. Then, we proposed a decision-making strategy to optimize the process of orienting components in circular loops. This strategy is based only on the technical-functional indicator, which is the SoH of the components. Finally, we showed an example of the implementation of the proposed method for the case of the electrical scooter motor.

Mots clés: Health indicator; Sate of health; circular economy; life cycle engineering; condition-based maintenance; Prognostic and Health Management

Domaines: Sciences de l'ingénieur [physics]

Christian Berenger WANDJI WOUAPI, Helmi Ben Rejeb, Peggy Zwolinski. Characterization of the state of health of a complex system at the end of use.. Procedia CIRP, 2022, 105, pp.49-54. ⟨10.1016/j.procir.2022.02.009⟩. ⟨hal-03714445⟩