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Le pli indique la mention suivante :"Proposition pour Assistance à maîtrise d’ouvrage pour la réalisation du PDU dela communauté d’agglomération de l’Albigeois.."Les documents relatifs à la candidature comprennent :♦ Les justifications à produire prévues à l'article 3 A ci dessus.Les documents relatifs à l'offre comprennent :♦ Le projet de marché demandé au paragraphe B de l'article 3 ci-dessus.ARTICLE 5 - EXAMEN DES OFFRES ET ATTRIBUTION DU MARCHE5.1 CRITERES D'ATTRIBUTIONLe choix de l'attributaire est fondée sur l'offre économiquement la plusavantageuse appréciée en fonction des critères énoncés ci-dessous avec leurpondération sous forme de pourcentages :Prix des prestations 50 %Valeur technique 40 %Délais 10 %Chaque criètere sera noté sur 20.Prix des prestations:note prix = 20* (offre la plus basse/offre analysée)Le montant de l’offre porté à l’acte d’engagement servira de base au calcul de lanote prix.Si des erreurs ou des incohérences sont constatées entre les différentsdocuments, l’acte d’engagement prévaudra.Valeur technique:La valeur technique sera analysée à partir de la note méthodologique etnotamment au vu:1/ De l’approche méthodologique générale de l’étude qui précisera :- Les moyens humains : Composition de l’équipe et rôle de chaque personnedans l’étude, profil et compétences et expériences de chacun des intervenants,RC page 8
Sensors 2010, 10 5782Fault detection and isolation is a necessary process in PHM to detect the occurrences of the faultsand then identify the types, sites, and causes of the fault. Some faults and failure mechanisms can beidentified by some sensor systems directly. For example, the resistance measurement can be used toisolate the open or short locations in a simple circuit, and corrosion sensors can use electrochemicalimpedance spectroscopy (EIS) to monitor the corrosion of structures directly [23]. For complexelectrical packages, some techniques or sensor systems can be used to isolate the failure sites. Forexample, the Scanning Superconductive Quantum Interference Device (SQUID microscopy) can beused to detect shorts in the microprocessors; 3D x-ray radiography/tomography can image variouslevels of interconnections; and scanning acoustic microscopy can detect the interfacial delaminationsand defects in the packages [24]. Other sensor systems using electromagnetic nondestructive testingtechnologies [25], ultrasonic guided wave technologies [26], or optical technologies [27] can detectcracks inside a product.Fault isolation can also be done by using mathematical models, such as principle componentanalysis (PCA) [1,28] and residuals estimation [29], to analyze the data from ―general‖ sensor systems.However, if the considered sensor system has the ability to detect and isolate the faults or failuremechanisms, it will improve the efficiency of PHM and provide more direct information. This type ofsensor system may have a complete structure, including sensing elements, memory, processors, anddisplay parts. They can monitor the corresponding parameters of the product, process the data usingcomputers included in the system, display plots, and provide alarms. The selection considerationspresented in this paper can also be used for the selection of this type of sensor systems.2.2. Sensor System PerformanceWhen the parameters to monitor are identified, the characteristics of these parameters, such as thepossible range and frequency, should be understood. These characteristics can be obtained based on thehistoric records of the data or the specifications of the products. These features of the parametersshould then be translated into the requirements for the performance attributes of sensor systems.Several relevant common performance attributes of sensor systems include the following:• Measurement Range: the lowest and highest values of the measurands that the sensor can sense.The measurement range of the sensor systems should be wider than the actual range ofthe measurand.• Dynamic Range: the ratio of the largest measurable output variation to the smallestdistinguishable output variation, usually expressed in dB [30]; this is an important aspect of asensor’s ability to respond to signals having both large and small amplitude variation.• Accuracy: the closeness of agreement between the measurement and the true value of themeasured quantity [31]. It can be presented as the error that is the difference between themeasurement and the true value.• Sensitivity: generally, the ratio between a small change in output to a small change in input,usually a unit change in input. Sensitivity represents the slope of the calibration curve [32]. Ingeneral, it can be described by the derivation of the output to the input. It may be a constant forall the inputs, but also may be different for different parts of the input.
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