Abstract
In recent years, there has been an increasing interest in the use of highly nonlinear solitary waves (HNSWs) for nondestructive evaluation and structural health monitoring applications. HNSWs are mechanical waves that can form and travel in highly nonlinear systems, such as granular particles in Hertzian contact. The easiest setup consists of a built-in transducer in drypoint contact with the structure or material to be inspected/monitored. The transducer is made of a monoperiodic array of spherical particles that enables the excitation and detection of the solitary waves. The transducer is wired to a data acquisition system that controls the functionality of the transducer and stores the time series for post-processing. In this paper, the design and testing of a wireless unit that enables the remote control of a transducer without the need to connect it to sophisticated test equipment are presented. Comparative tests and analyses between the measurements obtained with the newly designed wireless unit and the conventional wired configuration are provided. The results are corroborated by an analytical model that predicts the dynamic interaction between solitary waves and materials with different modulus. The advantages and limitations of the proposed wireless platform are given along with some suggestions for future developments.
Highlights
The first round of experiments was conducted on the thick steel plate and served as a control test to troubleshoot any possible problems associated with the wireless module
The first peak is the incident solitary wave (ISW) whereas the second peak around 550 μsec is the PSW
Both the ISW and the PSW were tailed by small humps
Summary
Nonlinear solitary waves (HNSWs) are mechanical waves that can form and travel in highly nonlinear systems such as mono-periodic arrays of elastically interacting spherical particles, sometimes indicated as granular crystals [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18]. One of the key features of HNSWs is that properties like duration, amplitude, and speed can be tuned without electronic equipment by adding static precompression on the array or varying the particles’ material and geometry. This tunability makes the use of HNSWs appealing in some engineering applications such as nondestructive testing (NDE), structural health monitoring (SHM) [19,20,21,22] or acoustics [23,24,25,26,27,28].
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