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Boumchich A, Picaut J, Aumond P, Can A, Bocher E. Blind Calibration of Environmental Acoustics Measurements Using Smartphones. SENSORS (BASEL, SWITZERLAND) 2024; 24:1255. [PMID: 38400417 PMCID: PMC10891730 DOI: 10.3390/s24041255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 01/25/2024] [Accepted: 02/05/2024] [Indexed: 02/25/2024]
Abstract
Environmental noise control is a major health and social issue. Numerous environmental policies require local authorities to draw up noise maps to establish an inventory of the noise environment and then propose action plans to improve its quality. In general, these maps are produced using numerical simulations, which may not be sufficiently representative, for example, concerning the temporal dynamics of noise levels. Acoustic sensor measurements are also insufficient in terms of spatial coverage. More recently, an alternative approach has been proposed, consisting of using citizens as data producers by using smartphones as tools of geo-localized acoustic measurement. However, a lack of calibration of smartphones can generate a significant bias in the results obtained. Against the classical metrological principle that would aim to calibrate any sensor beforehand for physical measurement, some have proposed mass calibration procedures called "blind calibration". The method is based on the crossing of sensors in the same area at the same time, which are therefore supposed to observe the same phenomenon (i.e., measure the same value). The multiple crossings of a large number of sensors at the scale of a territory and the analysis of the relationships between sensors allow for the calibration of the set of sensors. In this article, we propose to adapt a blind calibration method to data from the NoiseCapture smartphone application. The method's behavior is then tested on NoiseCapture datasets for which information on the calibration values of some smartphones is already available.
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Affiliation(s)
- Ayoub Boumchich
- UMRAE, CEREMA, Univ Gustave Eiffel, F-44344 Bouguenais, France; (A.B.); (P.A.); (A.C.)
| | - Judicaël Picaut
- UMRAE, CEREMA, Univ Gustave Eiffel, F-44344 Bouguenais, France; (A.B.); (P.A.); (A.C.)
| | - Pierre Aumond
- UMRAE, CEREMA, Univ Gustave Eiffel, F-44344 Bouguenais, France; (A.B.); (P.A.); (A.C.)
| | - Arnaud Can
- UMRAE, CEREMA, Univ Gustave Eiffel, F-44344 Bouguenais, France; (A.B.); (P.A.); (A.C.)
| | - Erwan Bocher
- Lab-STICC, UMR 6285, CNRS, Université Bretagne Sud, F-56000 Vannes, France;
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Ross G, Zhao Y, Bosman A, Geballa-Koukoula A, Zhou H, Elliott C, Nielen M, Rafferty K, Salentijn G. Data handling and ethics of emerging smartphone-based (bio)sensors – Part 1: Best practices and current implementation. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2022.116863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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Boumchich A, Picaut J, Bocher E. Using a Clustering Method to Detect Spatial Events in a Smartphone-Based Crowd-Sourced Database for Environmental Noise Assessment. SENSORS (BASEL, SWITZERLAND) 2022; 22:8832. [PMID: 36433428 PMCID: PMC9697211 DOI: 10.3390/s22228832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 10/25/2022] [Accepted: 10/26/2022] [Indexed: 06/16/2023]
Abstract
Noise has become a very notable source of pollution with major impacts on health, especially in urban areas. To reduce these impacts, proper evaluation of noise is very important, for example by using noise mapping tools. The Noise-Planet project seeks to develop such tools in an open science platform, with a key open-source smartphone tool "NoiseCapture" that allows users to measure and share the noise environment as an alternative to classical methods, such as simulation tools and noise observatories, which have limitations. As an alternative solution, smartphones can be used to create a low-cost network of sensors to collect the necessary data to generate a noise map. Nevertheless, this data may suffer from problems, such as a lack of calibration or a bad location, which lowers its quality. Therefore, quality control is very crucial to enhance the data analysis and the relevance of the noise maps. Most quality control methods require a reference database to train the models. In the context of NC, this reference data can be produced during specifically organized events (NC party), during which contributors are specifically trained to collect measurements. Nevertheless, these data are not sufficient in number to create a big enough reference database, and it is still necessary to complete them. Other communities around the world use NC, and one may want to integrate the data they collected into the learning database. In order to achieve this, one must detect these data within the mass of available data. As these events are generally characterized by a higher density of measurements in space and time, in this paper we propose to apply a classical clustering method, called DBSCAN, to identify them in the NC database. We first tested this method on the existing NC party, then applied it on a global scale. Depending on the DBSCAN parameters, many clusters are thus detected, with different typologies.
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Affiliation(s)
- Ayoub Boumchich
- UMRAE, CEREMA, Univ Gustave Eiffel, F-44344 Bouguenais, France
| | - Judicaël Picaut
- UMRAE, CEREMA, Univ Gustave Eiffel, F-44344 Bouguenais, France
| | - Erwan Bocher
- Lab-STICC CNRS UMR 6285, IUT de Vannes, F-56017 Vannes, France
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Yang X, Yang F, Shen X, Wang E, Zhang X, Shen C, Peng W. Development of Adjustable Parallel Helmholtz Acoustic Metamaterial for Broad Low-Frequency Sound Absorption Band. MATERIALS (BASEL, SWITZERLAND) 2022; 15:5938. [PMID: 36079319 PMCID: PMC9456593 DOI: 10.3390/ma15175938] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Revised: 08/23/2022] [Accepted: 08/23/2022] [Indexed: 06/15/2023]
Abstract
For the common difficulties of noise control in a low frequency region, an adjustable parallel Helmholtz acoustic metamaterial (APH-AM) was developed to gain broad sound absorption band by introducing multiple resonant chambers to enlarge the absorption bandwidth and tuning length of rear cavity for each chamber. Based on the coupling analysis of double resonators, the generation mechanism of broad sound absorption by adjusting the structural parameters was analyzed, which provided a foundation for the development of APH-AM with tunable chambers. Different from other optimization designs by theoretical modeling or finite element simulation, the adjustment of sound absorption performance for the proposed APH-AM could be directly conducted in transfer function tube measurement by changing the length of rear cavity for each chamber. According to optimization process of APH-AM, The target for all sound absorption coefficients above 0.9 was achieved in 602-1287 Hz with normal incidence and that for all sound absorption coefficients above 0.85 was obtained in 618-1482 Hz. The distributions of sound pressure for peak absorption frequency points were obtained in the finite element simulation, which could exhibit its sound absorption mechanism. Meanwhile, the sound absorption performance of the APH-AM with larger length of the aperture and that with smaller diameter of the aperture were discussed by finite element simulation, which could further show the potential of APH-AM in the low-frequency sound absorption. The proposed APH-AM could improve efficiency and accuracy in adjusting sound absorption performance purposefully, which would promote its practical application in low-frequency noise control.
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Affiliation(s)
- Xiaocui Yang
- Engineering Training Center, Nanjing Vocational University of Industry Technology, Nanjing 210023, China
- MIIT Key Laboratory of Multifunctional Lightweight Materials and Structures (MLMS), Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - Fei Yang
- College of Field Engineering, Army Engineering University of PLA, Nanjing 210007, China
| | - Xinmin Shen
- College of Field Engineering, Army Engineering University of PLA, Nanjing 210007, China
| | - Enshuai Wang
- College of Field Engineering, Army Engineering University of PLA, Nanjing 210007, China
| | - Xiaonan Zhang
- College of Field Engineering, Army Engineering University of PLA, Nanjing 210007, China
| | - Cheng Shen
- MIIT Key Laboratory of Multifunctional Lightweight Materials and Structures (MLMS), Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - Wenqiang Peng
- College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
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Guillaume G, Aumond P, Bocher E, Can A, Écotière D, Fortin N, Foy C, Gauvreau B, Petit G, Picaut J. NoiseCapture smartphone application as pedagogical support for education and public awareness. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2022; 151:3255. [PMID: 35649919 DOI: 10.1121/10.0010531] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 04/25/2022] [Indexed: 06/15/2023]
Abstract
Teaching science subjects such as acoustics to youth or the general public can be facilitated by illustrating physical phenomena or scientific issues using fun experiences. A few years ago, our team developed a smartphone application named NoiseCapture with the aim of offering to anyone the opportunity to measure their sound environment and to share their geolocated measurements with the community in order to build a collective noise map. Since then, NoiseCapture team members have experimented with numerous interventions in schools or scientific events for the general public based on the app to explain not only societal and environmental issues related to noise but also to teach acoustic notions and to address technical and scientific topics associated with sound measurement. This paper describes some of the interventions implemented, in particular, in a school context through training courses given to middle school and university students, as well as teachers of secondary school, that focused on basic knowledge of buildings and environmental acoustics, on the practice of acoustic measurement, and on noise mapping. Some examples of interventions with the general public are also presented that were mostly integrated into scientific events.
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Affiliation(s)
- Gwenaël Guillaume
- Unité Mixte de Recherche en Acoustique Environnementale, Centre d'Études et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement, Université Gustave Eiffel, Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux, F-67035 Strasbourg, France
| | - Pierre Aumond
- Unité Mixte de Recherche en Acoustique Environnementale, Université Gustave Eiffel, Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux, Centre d'Études et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement, F-44344 Bouguenais, France
| | - Erwan Bocher
- Centre National de la Recherche Scientifique, Laboratoire des Sciences et Techniques de l'Information, de la Communication et de la Connaissance (Unité Mixte de Recherche 6285), 56017 Vannes, France
| | - Arnaud Can
- Unité Mixte de Recherche en Acoustique Environnementale, Université Gustave Eiffel, Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux, Centre d'Études et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement, F-44344 Bouguenais, France
| | - David Écotière
- Unité Mixte de Recherche en Acoustique Environnementale, Centre d'Études et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement, Université Gustave Eiffel, Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux, F-67035 Strasbourg, France
| | - Nicolas Fortin
- Unité Mixte de Recherche en Acoustique Environnementale, Université Gustave Eiffel, Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux, Centre d'Études et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement, F-44344 Bouguenais, France
| | - Cédric Foy
- Unité Mixte de Recherche en Acoustique Environnementale, Centre d'Études et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement, Université Gustave Eiffel, Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux, F-67035 Strasbourg, France
| | - Benoit Gauvreau
- Unité Mixte de Recherche en Acoustique Environnementale, Université Gustave Eiffel, Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux, Centre d'Études et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement, F-44344 Bouguenais, France
| | - Gwendall Petit
- Centre National de la Recherche Scientifique, Laboratoire des Sciences et Techniques de l'Information, de la Communication et de la Connaissance (Unité Mixte de Recherche 6285), 56017 Vannes, France
| | - Judicaël Picaut
- Unité Mixte de Recherche en Acoustique Environnementale, Université Gustave Eiffel, Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux, Centre d'Études et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement, F-44344 Bouguenais, France
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