Advanced ultrasonic monitoring system
for the structural integrity of pipes

Research project financed by :

Executive Agency for Higher Education, Research, Development and Innovation Funding

        (Unitatea Executivă pentru Finanţarea Învăţământului Superior, a Cercetării, Dezvoltării şi Inovării - UEFISCDI)

Project codePN-II-ID-PCE-2011-3-0512

Contract No. :  94 /2011

Brief project description
Structural integrity of machines and mechanical structures becomes in recent years a research field of high interest, based on long range ultrasonic techniques. Tubes and pipes are used in all machines and mechanical structures, from airplanes to nuclear plants. After more than ten years working in the field of theoretical and numerical modeling of guided waves propagation, a new approach is the core of this research project. The objectives are multiple and convergent to a new monitoring system which will incorporate as embedded software, the scientific results of this project.

One objective is to develop the model and software for determining all classes of propagating ultrasonic guided modes and select the best one for a given type of defect. All geometrical and material properties of a pipe will be integrated in the model and software. Moreover, a complete study of the influence on the propagation range, of such factors as pipe bending, surrounding medium properties and inside fluid properties and flow, are considered as another original objective.
These factors have never been studied in their inter-relationship. Laboratory experiments are included in the last months of the project, using existing and new equipment. The team includes young members who will acquire research competences. Dissemination of results through the international scientific community will confirm the originality of our results.

Group velocities of the longitudinal modes in pipes, obtained with our software developped in this project (left). One experiment on longitudinal guided waves in pipes confirming the group velocities and detectablity of defects, in this project (right).

High accuracy dispersion curves of pipes (above). Results obtained using the new Computer code developed in this project (TUBEWAVE - see separate description page). This new computer code allowed remarking new features in the low frequency range, were other solvers are insufficiently accurate. 

Experiment done using available equipment in 2012.

Experiment done in 2014, using new equipment (laser velocimeter and first stage positioning system)

                                                Experiment done in 2015, using new equipment (laser velocimeter and advanced positioning system)

                                                 Detail with the motion controller and the stepper motor (assembled by our team)            Detail with the controller user interface (developed by our team in Matlab & Arduino)



Book cover                                                           Authors' comments (click on image to zoom)                                      Book details (click on image to zoom)

Book published in 2016: C.C. Petre, M.V. Predoi "Ultrasonic guided waves in tubes" (in Romanian) Ed. Matrix ROM, ISBN: 978-606-25-0281-2, 141 pg. 2016.  Can be ordered at the publisher: