On measuring mechanical oscillations using smartphone sensors

Höpfner, Hagen; Morgenthal, Guido; Schirmer, Maximilian; Naujoks, Marcel; Halang, Christoph

doi:10.1145/2557968.2557972

Cited by 23 publications

(19 citation statements)

References 11 publications

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“…iPods, as well as other mobile devices, have been evaluated by others for their ability to be used to measure mechanical oscillations (Hopfner et al, 2013). Certainly, mobile devices are being used to collect and analyze large datasets involving geospatial data of all kinds.…”

Section: Literature Reviewmentioning

confidence: 99%

Dynamic Evaluation of Transportation Structures with iPod-Based Data Acquisition

Riley¹

2017

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This grant supported coursework and laboratory development and expanded research capacity, promoting (a) innovative learning activities that expose students to cutting-edge methods of bridge structural health and behavior monitoring and (b) research by our growing group of graduate students using developing technologies (specifically, shake tables and iPods with on-board accelerometers). As transportation infrastructure reaches and exceeds its design life, engineering efforts are turning to evaluation, rehabilitation and repair. Accurately assessing structures to determine their future performance and remaining life is becoming a primary job function for many civil engineers. As part of this project, graduate students worked with the PI to develop course modules that employed iPods in the laboratory and classroom to introduce concepts of vibrations, dynamic evaluation methods, structural health monitoring, and damage detection. Learning gains as a result of the module were assessed with both direct and indirect methods. While learning gains appeared stronger for students who participated in the hands-on component of the laboratory, due to the small class size there were no statistically significant differences between using iPods in a hands-on laboratory versus a purely computational laboratory. However, students indicated that iPods and hands-on laboratories were their preferred experience. The team also investigated laboratory and field applications, as well as effectiveness, of iPods to study structural dynamics and structural health monitoring methods, specifically for area bridges and other transportation structures. Sensor networks and mobile device-based accelerometers are beginning to be recognized as a valid means for conducting structural evaluations. The equipment purchased with this grant allowed for a new laboratory to be developed at Oregon Tech to support multiple undergraduate and graduate elective courses including Bridge Rating, Bridge Design, Transportation Structures, and Structural Dynamics. The Structural Health and Kinetic Evaluation (SHAKE) Laboratory and the associated equipment will support education and research efforts at Oregon Tech well into the future. ACKNOWLEDGEMENTSThe project team would like to acknowledge the generous support of NITC for the work documented in this report. The development of the laboratory and curriculum in the area of transportation and infrastructure health, as well as the increased capacity for applied research at Oregon Tech, would not have been possible without the institute's assistance. DISCLAIMERThe contents of this report reflect the views of the authors, who are solely responsible for the facts and the accuracy of the material and information presented herein. This document is disseminated under the sponsorship of the U.S. Department of Transportation University Transportation Centers Program in the interest of information exchange. The U.S. Government assumes no liability for the contents or use thereof. The contents do not necessarily reflect the ...

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Section: Literature Reviewmentioning

confidence: 99%

Dynamic Evaluation of Transportation Structures with iPod-Based Data Acquisition

Riley¹

2017

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“…Moreover, its advanced communication and networking capabilities enable the users to connect with each other or the web. A number of studies have discussed the possibility of using smartphones and citizen collaboration for SHM purposes [ 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Citizen Sensors for SHM: Towards a Crowdsourcing Platform

Özer

Feng

2015

Sensors

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This paper presents an innovative structural health monitoring (SHM) platform in terms of how it integrates smartphone sensors, the web, and crowdsourcing. The ubiquity of smartphones has provided an opportunity to create low-cost sensor networks for SHM. Crowdsourcing has given rise to citizen initiatives becoming a vast source of inexpensive, valuable but heterogeneous data. Previously, the authors have investigated the reliability of smartphone accelerometers for vibration-based SHM. This paper takes a step further to integrate mobile sensing and web-based computing for a prospective crowdsourcing-based SHM platform. An iOS application was developed to enable citizens to measure structural vibration and upload the data to a server with smartphones. A web-based platform was developed to collect and process the data automatically and store the processed data, such as modal properties of the structure, for long-term SHM purposes. Finally, the integrated mobile and web-based platforms were tested to collect the low-amplitude ambient vibration data of a bridge structure. Possible sources of uncertainties related to citizens were investigated, including the phone location, coupling conditions, and sampling duration. The field test results showed that the vibration data acquired by smartphones operated by citizens without expertise are useful for identifying structural modal properties with high accuracy. This platform can be further developed into an automated, smart, sustainable, cost-free system for long-term monitoring of structural integrity of spatially distributed urban infrastructure. Citizen Sensors for SHM will be a novel participatory sensing platform in the way that it offers hybrid solutions to transitional crowdsourcing parameters.

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“…In recent years, smartphones have become popular on an unprecedented scale and can now be used as effective scientific tools. With an operating system, communication system and built-in sensors, they have already been applied to cyber-physical systems [ 8 ], including human health monitoring [ 9 ], vehicle maintenance services [ 10 ] and accident detection [ 11 ], motivation recognition [ 12 , 13 , 14 , 15 ], and structural health monitoring (SHM) [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. Authors have also applied smartphones in the SHM field [ 25 ], in uses such as cable force monitoring [ 26 , 27 , 28 ], displacement monitoring [ 29 ], and earthquake rescue [ 30 , 31 ], etc.…”

Section: Introductionmentioning

confidence: 99%

A Cyber-Physical System for Girder Hoisting Monitoring Based on Smartphones

Han

Zhao

et al. 2016

Sensors

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Abstract:Offshore design and construction is much more difficult than land-based design and construction, particularly due to hoisting operations. Real-time monitoring of the orientation and movement of a hoisted structure is thus required for operators' safety. In recent years, rapid development of the smart-phone commercial market has offered the possibility that everyone can carry a mini personal computer that is integrated with sensors, an operating system and communication system that can act as an effective aid for cyber-physical systems (CPS) research. In this paper, a CPS for hoisting monitoring using smartphones was proposed, including a phone collector, a controller and a server. This system uses smartphones equipped with internal sensors to obtain girder movement information, which will be uploaded to a server, then returned to controller users. An alarming system will be provided on the controller phone once the returned data exceeds a threshold. The proposed monitoring system is used to monitor the movement and orientation of a girder during hoisting on a cross-sea bridge in real time. The results show the convenience and feasibility of the proposed system.

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On measuring mechanical oscillations using smartphone sensors

Cited by 23 publications

References 11 publications

Dynamic Evaluation of Transportation Structures with iPod-Based Data Acquisition

Dynamic Evaluation of Transportation Structures with iPod-Based Data Acquisition

Citizen Sensors for SHM: Towards a Crowdsourcing Platform

A Cyber-Physical System for Girder Hoisting Monitoring Based on Smartphones

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