Abstract: Relative displacements related to a structure are measured for use of a feedback signal in real time for the structural monitor of active and semi-active vibration. The monitors reduce structural movement caused by any source of natural or artificial vibration. A pre-stressed axial element is installed between two different points of the structure using a fixed connector and a flexible one. As the structure vibrates in response to an external “source”, a relative displacement is caused between two connecting points of the axial element, which can be measured based on the rotation ? of the flexible connector of the axial element. Discrete displacement can be obtained in real time of the whole structure where the axial element is installed. A modal monitor through active or semi-active devices can improve the structural behavior in some cases.

Abstract: The present invention shows a solution to measure the relative displacements related to a structure in order to use the signal measured as feedback signal in real time for the structural monitor of the active and semi-active vibration. Said monitors reduce the structural movement caused by any source of natural or artificial vibration. The conventional measurement methods of the relative displacement are often not able to accurately measure the displacement in real time. The delay in the signal measured often has a negative effect on the feedback monitor device. The invention consists in a pre-stressed axial element (1), installed between two different points of the structure (2) using a fixed connector (5) and a flexible one (6). As the structure (2) vibrates in response to an external “source”, a relative displacement is caused between two connecting points of the axial element, which can be measured based on the rotation ? of the flexible connector (5) of the axial element.