Author: GAUDIN Michael Affiliation: DER Electricite De France Title: INVERSE IDENTIFICATION AND UPDATING IN VIBRATIONS OF PIPING SYSTEMS Text: This paper concerns the area of vibrations in piping systems of nuclear power plants. One need to represent as better as possible the dynamic behaviour of those systems with respect to the measurements performed on a real structure. In a software develop...

A failure of the non-structural component can cause significant damages in critical facilities such as nuclear power plants and hospitals. Historically, it was reported that the damage from the leakage of sprinkler systems, resulted in the shutdown of hospitals for several weeks by the 1971 San Fernando and 1994 North Ridge earthquakes. In most cases, water leakages were observed at the cross j...

In real systems, the phenomena, such as pipe-wall viscoelasticity, unsteady friction or fluid structure interaction induce additional damping and dispersion of transient pressure waves than that defined by classical waterhammer. In this paper, unsteady friction models and viscoelastic damping models will be presented and a theoretical formulation of the viscoelastic damping in piping systems wi...

background central dialysate fluid delivery systems (cdds) are used by dialysis centers in japan, and although these systems are effective at delivering dialysate, they have a complex piping network with numerous sites where contamination can develop. in japan, cleaning disinfectants have been clinically evaluated based on endotoxin levels and bacterial counts, but there have been no published ...

A lot of plumbings such as gas pipes and water pipes exist in factories and so on. However, it is difficult for humans to inspect them directly because they are laid underground. Therefore, automated inspection by robots is desirable, and many efforts have been done to solve this problem. However, many of existing inspection robots have to rotate the camera to record images in piping because a ...

Risk-Informed In-Service Inspection (RI-ISI) aims at prioritizing the components for inspection within the permissible risk level thereby avoiding unnecessary inspections. The two main factors that go into the prioritization of components are failure frequency and the consequence of the failure of these components. The study has been focused on piping component as presented in this paper. Failu...

This paper builds on the flexibility of the level-set representation to model in a unified manner the expansion of a hollow in the ground under different physical phenomena. In particular, the dissolving action of a flow of water in a saturated soil, and that of a jet of particles of water in a non-saturated one, are represented in a common framework. In that manner, the complex geometrical evo...

The Displacement calculus was introduced by Morrill, Valent́ın & Fadda (2011) as an extension of the Lambek calculus with discontinuous operators. These discontinuous connectives allow the Displacement calculus to solve a large number of problems with the Lambek calculus. Examples of the phenomena treated by Morrill et al. (2011) include discontinuous idioms (such as “ring up” and “give the cold...