Single-sensor approach for impact localization and force reconstruction by using discriminating vibration modes

Abstract

This study presents a novel strategy for identifying an impact event on a structure from vibration measurements. Compared to triangulation techniques that require at least three sensors on a plate-like structure, only one sensor is used in this work for localizing the impact point. The proposed approach consists in extracting specific modal ponderations as a signature of impact location. The force reconstruction problem is simultaneously addressed by fitting a parametric law. The proposed procedure captures the main load history parameters such as the impact time, its duration and its intensity. An impact test campaign is performed on a metallic plate, equipped with one accelerometer only, to confirm the validity of the proposed single-sensor approach. The methodology is efficient for accurately localizing impacts that are applied anywhere on the plate and for quickly estimating the main load history parameters.

Impact localization on a composite fuselage with a sparse network of accelerometers

“…if appropriate vibration modes are selected in the analysis. It is also evidenced in [21] that the identification of Z F (presented in Section 3.3) is quite sensitive to the sensor locations. In particular, the sensors must not be located on a modal node of one of the modes considered in the analysis; otherwise, the corresponding modal ponderation cannot be sensed.…”

“…It can be noted that the impact intensity f δ does not change the proportions in which the vibration modes are excited. It is actually proved in [21] that Z F is bijectively linked to the impact point:…”

“…The idea proposed in [21] is to concede localizing the impact point within a proximity tolerance > 0, which results in introducing a collinearity tolerance into the procedure. More precisely, let us denote as S = {M 1 , .…”

“…The technique presented in this paper was initially published in [21], but it was experimentally validated on a small metallic plate under laboratory conditions. The two main contributions of this paper are to validate the proposed technique on a very large industrial composite structure and to demonstrate that a few low frequency sensors may be sufficient to localize impacts with good accuracy.…”

Multimode velocity-delayed feedback vibration control of plates using a single sensor and a single actuator

“…Although the control method is called SISO, yet the controller requires the use of multiple sensors and multiple actuators. Using a single sensor, Goutaudier et al (2020) were able to localize the impact point on a plate-like structure that usually requires at least three sensors. Using a single sensor and a single actuator in controlling multimode vibrations is highly rare and challenging.…”