Determination of impact events on a plate-like composite structure

Xu, Lin; Wang, Y.; Cai, Yongchao; Wu, Zhen; Peng, Weicai

doi:10.1017/aer.2016.36

Cited by 8 publications

(20 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the traditional CoG method (Chen et al, 2012b;Xu et al, 2016;De Simone et al, 2018), after a baseline grid of M C TR values are obtained, the average of the C TR values relating to the four nodes of each grid cell is calculated. The resulting coefficient, is called the "global time reversal coefficient, " C TR_GLOBAL .…”

Section: Traditional Cog Methodsmentioning

confidence: 99%

Impact Localization in Composites Using Time Reversal, Embedded PZT Transducers, and Topological Algorithms

Coles

Castro

Andreades

et al. 2020

Front. Built Environ.

View full text Add to dashboard Cite

Time reversal is a powerful imaging processing technique that focuses waves at their original source using a single receiver transducer when diffusive wave field conditions are met. This has been successfully proved on various engineering components and materials using elastic waves with surface bonded transducers. This paper investigates the performance of time reversal for the localization of impact sources on fiber reinforced plastic composite structures with embedded piezoelectric sensors. A topologic approach, here named as minimum average method, is proposed to enhance the accuracy of time reversal in retrieving the impact location. Experimental tests were carried out to validate the robustness and reliability of time reversal against traditional topological approaches by altering impulsive responses contained in the baseline signals. Impact localization results revealed that time reversal and the new topological approach provided high accuracy in identifying the impact location, particularly in the presence of double impacts and material damage, which were not accounted during the initial training process. Results indicate that time reversal with embedded transducers has potential to be effective in real operating conditions, where alterations of acoustic emission responses in the baseline signals are less predictable.

show abstract

Section: Traditional Cog Methodsmentioning

confidence: 99%

Impact Localization in Composites Using Time Reversal, Embedded PZT Transducers, and Topological Algorithms

Coles

Castro

Andreades

et al. 2020

Front. Built Environ.

View full text Add to dashboard Cite

show abstract

“…The transfer function at the impact location can then be obtained by using an interpolation of transfer functions associated with the cell whose vertices are the four calibration points surrounding the impact location. In this regard, Park et al firstly proposed the shape functions (SF) method, which uses polynomial interpolating functions (also known as shape functions) to reconstruct the impact force ( [16][17][18][19]). The main idea of the SF technique is to relate the cell with a regular element of the same topology, whose edges have a non-dimensional length (see Figure 4).…”

Section: Radial Basis Function 2d Interpolationmentioning

confidence: 99%

“…(13). The impact force in time domain was calculated by the inverse Fourier transform of the average impact spectrum as expressed by the following expression [19]:…”

Section: Impact Force Identificationmentioning

confidence: 99%

A hierarchical method for the impact force reconstruction in composite structures

Simone

Ciampa

Meo

2019

Smart Mater. Struct.

View full text Add to dashboard Cite

Impact damage is a major concern for new generation aircraft composite components due to their low impact resistance capabilities. The development of an impact location and force reconstruction algorithm would provide rapid and efficient prediction of damage occurrence, thus making structures safer and creating maintenance inspection procedures more efficient, thus saving time and costs. However, state-of-the-art impact force reconstruction algorithms use reference data from numerical simulations and require a detailed knowledge of mechanical properties, which are difficult to obtain under real operational conditions. This paper presents a hierarchical impact force reconstruction algorithm that relies on experimental structural responses measured by a sparse array of surface bonded receiving ultrasonic transducers. This algorithm uses time reversal method to retrieve the location of an impact source and interpolation techniques based on hierarchical radial basis functions to calculate the transfer function at the impact point and reconstruct the impact force history. A number of impact testing were performed on a composite plate-like structure and a wing stringer-skin panel, and compared with impact force algorithms available in literature. Experimental results revealed that the proposed impact force reconstruction method was able to extrapolate the information associated with points far from the impact location and determine the impact force history with high level of accuracy in a real aircraft structure. Since the proposed algorithm requires the calibration of transfer functions from a very

show abstract

“…According to Figure 3, each cell of the grid on the monitoring zone is identified by four nodes and it was possible to perform a further mean among the correlation coefficients associated to each node in order to calculate a global correlation coefficient of the cell, indicated as c TR_GLOBAL . Similarly to [36] and [37], the impact coordinates were finally estimated by the following centre-ofgravity method:…”

Section: Impact Localisation Algorithm -Time Reversalmentioning

confidence: 99%