Conference: INVERSE PROBLEMS IN ENGINEERING Author: GAUDIN Michael Affiliation: DER Electricite De France Title: INVERSE IDENTIFICATION AND UPDATING IN VIBRATIONS OF PIPING SYSTEMS

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 developed by Electricite de France, this behaviour is idealised in mechanics with exact dynamic stiffness matrices, and in acoustics with plane waves. According to this idealisation, we don’t need to discretise piping systems like in finite element methods (a pipe is only one element, a node is a singularity like an elbow, a pump, a diaphragm, ...). Using exact transfer matrices, we can also place a sensor everywhere on a straight pipe. But their are two main problems when idealising a real structure :