By Rafael Gouriveau, Kamal Medjaher, Noureddine Zerhouni
This booklet addresses the stairs had to display screen future health evaluation platforms and the anticipation in their mess ups: selection and site of sensors, facts acquisition and processing, health and wellbeing overview and prediction of the period of residual precious lifestyles. The electronic revolution and mechatronics foreshadowed the arrival of the 4.0 the place gear has the power to speak. The ubiquity of sensors (300,000 sensors within the new generations of plane) produces a flood of knowledge requiring us to offer desiring to details and ends up in the necessity for effective processing and a correct interpretation. the method of traceability and capitalization of information is a key aspect within the context of the evolution of the upkeep in the direction of predictive strategies. Read more...
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Additional resources for From prognostics and health systems management to predictive maintenance 1: monitoring and prognostics
13. 5. Partial synthesis In this chapter, a general approach for obtaining monitoring data, reliable and exploitable for a PHM application is proposed. Three steps are highlighted: 1) Choice of critical components. ), and then deploying a PHM approach. Acquisition: From System to Data 31 2) Deﬁnition of physical parameters to be monitored and choice of sensors to be installed. Anticipating failure phenomena requires as a minimum the ability to observe these phenomena. Therefore, the goal of this phase is to lay the foundations for a monitoring system (physical parameters to measure and associated sensors).
5). 5. Simpliﬁed and illustrated structure of an acquisition chain Acquisition. 6). The role of these cards is to acquire (input) and to deliver (output) some signals (input/output cards). Inputs and outputs can be analog and/or digital, depending on the intended application. Two types of cards exist: cards that can be plugged into the central unit of a computer, and external cards (or pluggable into an external dedicated casing). Most of the cards dedicated to data acquisition include signal conditioners, ﬁlters, multiplexers, and analog to digital converters.
At the ﬁrst decomposition level, the signal passes through LP to produce an approximation signal (A1), and through HP to produce a detail signal (D1). The approximated signal is characterized by half of the points (256), whereas frequency resolution is doubled since the frequency band has been halved ([0 − π2 ]). 5) in order to construct A2 and D2, and this process can be repeated as many times as desired. The features extracted using WPD correspond to energy coefﬁcients of decomposition levels.