Loading…
This event has ended. Visit the official site or create your own event on Sched.
Welcome to ICSV26!
Back To Schedule
Wednesday, July 10 • 17:30 - 17:50
TRANSIENT FORCE ANALYSIS TECHNIQUE TO IDENTIFY TIME-VARYING LOADS AND DEFECTS ON PLATES

Log in to save this to your schedule, view media, leave feedback and see who's attending!

Feedback form is now closed.
Identifying vibration sources on structures is frequently impossible to perform via direct measurements, and has to be carried out by solving an inverse problem. In this context, this article presents an extension of the force analysis technique. This extension allows identifying transient loads on plate-like structures from the measurement of transverse displacements on a grid of points. The proposed method consists in injecting this data into the discretized equation of motion expressed in time and space domains to get the residual force of the equilibrium. To overcome the sensitivity of the problem to noise, a regularization step using Tikhonov's L2 cost function is performed. This formulation allows inspecting only part of the structure, and finding the time signature of dynamic loads. By adding prior knowledge on the source's location, the proposed method also allows pinpointing material inhomogeneities or defects, which cause non-zero residual forces outside the loading area. The technique is experimentally validated on a plexiglass plate on which an added mass representing a material defect is placed. The impact force is recovered from measurements on the plate : its location is successfully identified and the impact hammer data is compared to the reconstructed force. The knowledge of the force location is used to successfully detect the added mass.

Moderators
AR

Annie Ross

Professor, Polytechnique Montreal

Authors

Wednesday July 10, 2019 17:30 - 17:50 EDT
Westmount 3
  T10 Sig. Proc. & nonlin. mthds., RS04 Signal process in ac & vibr