D. Thomasson’s scientific contributions

Two methods for measuring the vibrational power flow in structures are presented. We have developed the first one which uses a finite difference approximation through a 5-accelerometer probe. It is applied to beams, plates and thin shells when excited by bending waves. The second one detects the structural surface intensity (S.S.I) for all families of waves on all kinds of structures using 3 strain gauges and 2 in-plane accelerometers. We give the formalism for both and compare them on a laboratory experiment on a thin cylinder. We show how to localise experimentally (on a cylinder and a plate) sources and sinks of vibration energy by an intensity mapping. The respective values and limitations of these methods are discussed, as well as necessary developments for a global operational approach for structural intensity measurements.