Optimal dual-PZT sizing and network design for baseline-free SHM of complex anisotropic composite structures
TypeArticles dans des revues avec comité de lecture
Structural Health Monitoring (SHM) processes for aeronautic composite structures are generally based on the comparison between healthy and unknown databases. The need for prior baseline signals is one of the barriers to an industrial deployment and can be avoided with “baseline-free” SHM (BF-SHM) methods based on the attenuations and reflections of symmetric and antisymmetric Lamb waves modes attributable to a damage. A promising mode decomposition method is based on the use of dual PZTs (concentric disc and ring electrodes lying on a single PZT). However, performances of such methods highly depend on the Lamb wave modes properties (propagation speed and attenuation that vary with material orientation and inter-PZT distance), the number and the sensitivity of the dual PZT to each mode (which depends on the frequency and element size). Considering these constraints, an original three-step process able to design a full dual-PZT network and the optimal range of excitation frequencies to consider on a highly anisotropic and arbitrarily complex aeronautic structure is presented. First, the dispersion curves of Lamb waves in the investigated material together with the minimal size of the damage to detect are used to estimate the size of the dual PZT as well as convenient excitation frequencies. A Local Finite Element Model representative of the full-scale structure is then used to estimate optimal distance and orientation between neighbor PZTs elements. Finally, a network optimization solver applies these parameters to place dual-PZTs on a fan cowl of an aircraft nacelle and provides a candidate network covering the whole structure.
Files in this item
Showing items related by title, author, creator and subject.
Optimal dual-PZT sizing and network design for baseline-free SHM of complex anisotropic composite structures LIZÉ, Emmanuel; REBILLAT, Marc; MECHBAL, NAZIH; BOLZMACHER, Christian (Institute of Physics Publishing, 2018)Structural health monitoring (SHM) processes for aeronautic composite structures are generally based on the comparison of healthy and unknown databases. The need for prior baseline signals is one of the barriers to industrial ...
LIZE, Emmanuel; REBILLAT, Marc; MECHBAL, Nazih; BOLZMACHER, Christian (2018)Structural Health Monitoring is a multidisciplinary field whose aim is to monitor damages within structures. Damages are detected by means of features - Damage Index (DI) - obtained by comparing measurements obtained from ...
Spatial integration of baseline-free damage detection algorithms based on dual-PZT for the structural health monitoring of anisotropic composite aeronautic structures LIZE, Emmanuel; REBILLAT, Marc; MECHBAL, Nazih; BOLZMACHER, Christian (DEStech Publications, 2019)The focus is put here on the Structural Health Monitoring (SHM) of composite aeronautic structure using Lamb waves emitted and recorded with piezoelectric transducers (PZT). Conventional algorithms perform Lamb waves ...
BOLZMACHER, Christian; BENBARA, Nassim; REBILLAT, Marc; MECHBAL, Nazih (A. Benjeddou, N. Mechbal and J.F. Deü, 2019)This paper describes the comparison of three different types of piezoelectric actuators for application in sound emitting panels so-called load-bearing surface loudspeaker. The first actuator is a piezoelectric ring glued ...
Estimation of the temperature field on a composite fan cowl using the static capacity of surface-mounted piezoceramic transducers LIZE, Emmanuel; REBILLAT, Marc; MECHBAL, Nazih (2017)The influence of temperature on SHM (Structural Health Monitoring) systems using guided waves is a major problem for their industrial deployment. One of the most used and cheapest SHM process developed in aeronautic context ...