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Open AccessArticle

Stabilization of a p-u Sensor Mounted on a Vehicle for Measuring the Acoustic Impedance of Road Surfaces

1
iPOOL S.r.l., via Cocchi 7, 56121 Pisa, Italy
2
Physics Department, University of Pisa, Largo Bruno Pontecorvo 3, 56127 Pisa, Italy
3
CNR-INM Section of Acoustics and Sensors O.M. Corbino, via del Fosso del Cavaliere 100, 00133 Rome, Italy
4
Environmental Protection Agency of Tuscany Region, via Vittorio Veneto 27, 56127 Pisa, Italy
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(5), 1239; https://doi.org/10.3390/s20051239
Received: 29 January 2020 / Revised: 13 February 2020 / Accepted: 15 February 2020 / Published: 25 February 2020
The knowledge of the acoustic impedance of a material allows for the calculation of its acoustic absorption. Impedance can also be linked to structural and physical proprieties of materials. However, while the impedance of pavement samples in laboratory conditions can usually be measured with high accuracy using devices such as the impedance tube, complete in-situ evaluation results are less accurate than the laboratory results and is so time consuming that a full scale implementation of in-situ evaluations is practically impossible. Such a system could provide information on the homogeneity and the correct laying of an installation, which is proven to be directly linked to its acoustic emission properties. The present work studies the development of a measurement instrument which can be fastened through holding elements to a moving laboratory (i.e., a vehicle). This device overcomes the issues that afflict traditional in-situ measurements, such as the impossibility to perform a continuous spatial characterization of a given pavement in order to yield a direct evaluation of the surface’s quality. The instrumentation has been uncoupled from the vehicle’s frame with a system including a Proportional Integral Derivative (PID) controller, studied to maintain the system at a fixed distance from the ground and to reduce damping. The stabilization of this device and the measurement system itself are evaluated and compared to the traditional one. View Full-Text
Keywords: p-u sensor; p-p sensor; noise; Adrienne; stabilization; damping; acoustic impedance; road surfaces p-u sensor; p-p sensor; noise; Adrienne; stabilization; damping; acoustic impedance; road surfaces
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Bianco, F.; Fredianelli, L.; Lo Castro, F.; Gagliardi, P.; Fidecaro, F.; Licitra, G. Stabilization of a p-u Sensor Mounted on a Vehicle for Measuring the Acoustic Impedance of Road Surfaces. Sensors 2020, 20, 1239.

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