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This paper examines the obsolescence of the “Reliability Prediction of Electronic Equipment” handbook (MIL-HDBK-217) under both technical and operative points of view, evaluating its strengths and its weaknesses. Practically the handbook is no more applicable, so it is necessary to trace the philosophy for a new method that overcomes the '217 problems: new scenarios for the reliability calculation...
This paper deals with the idea of developing new philosophies for the reliability assessment of additive layer manufacturing (ALM) parts. ALM is a disruptive new manufacturing method by which components are created adding material layer after layer, allowing for the design and production of complex geometries, unthinkable with the use of traditional subtractive machining methods. Thinking ALM means...
In the Life Cycle Management context of complex systems there are a few “families” of products which, due to the aleatory behavior of the development and production processes, present difficulties in the management of the remaining usable life and spare parts approach. One of such “family” is represented by composite materials and products. This article proposes a methodology to improve their support...
Recent developments in the Logistic Engineering field are expanding the range of analysis for Operational Availability (Ao) from purely statistical models to include prognostic models. A necessary step in order to perform prognostic analysis is the study of system's components degradations. The degradation of a component is a case by case study, which characteristics that change significantly even...
Recent developments in the Logistic Engineering field are expanding the range of analysis for Operational Availability (Ao) from purely statistical models to include prognostic models. The prognostic method allows to obtain data on otherwise costly to test failure mechanics, while also providing information on the component degradation physics and their performance alteration. Failure in a system...
Through the concept of the “physics of failure,” this article analyzes a possible extension of the modern Logistic Support Analysis (LSA) databases such as ASD S3000L in order to support a new view of operational availability based on the categorization of stresses obtained by operational scenarios and applicable to FMMEA (Failure Mode Mechanism Effect Analysis). In order to integrate such methodologies...
In this work we present an investigation on a conductive thermoplastic nanocomposite used as flexible and stretchable strain gauge to be applied on inflatable structures for both terrestrial and extra-terrestrial applications. In particular we analysed the sensor behaviour by using an one-dimensional expansion system for increasing strain up to 5% and we studied the device changing in temperature...
A methodology to enhance the efficiency of avionic measurements through the support of the ASD S3000L database is proposed. This proposal aims to the integration of an expanded FMEA analysis, supported by the S3000L database structure, with the "in field" avionic measurements. This should lead to the reduction of the times and costs involved into failure identification and resolution and...
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