Use of Fiber-Optic Sensors for the Detection of the Rail Vehicles and Monitoring of the Rock Mass Dynamic Response Due to Railway Rolling Stock for the Civil Engineering Needs

Nedoma, Jan; Stolárik, Martin; Fajkus, Marcel; Pinka, Miroslav; Hejduk, Stanislav

doi:10.3390/app9010134

Cited by 18 publications

(17 citation statements)

References 40 publications

(40 reference statements)

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“…This building is a dilapidated building of the shopping center Ostravice right in the city center at the crossroads of several tram tracks. These measurements are realized by using standard instrumentation for seismic monitoring (used in this article) and a newly developed fiber-optic interferometric sensor [25]. The data obtained so far show that the vibrations due to passing trams have had and still have a significant impact on the current condition of the building.…”

Section: Discussionmentioning

confidence: 99%

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Ground-Borne Vibration Due to Construction Works with Respect to Brownfield Areas

2019

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Ground-borne vibration caused by mechanized construction works is the most common problem in built-up areas in general. In post-industrial cities, there are many building facilities in the category of brownfields. Parts of these buildings are often technically and culturally valuable buildings with varying degrees of decay. These are very susceptible to vibrations. The revitalization of brownfield areas employs a wide range of works and practices, among which are those that have adverse effects in the form of vibrations and shocks. This paper presents a theoretical study and original results concerning the seismic load on historical and dilapidated buildings in brownfield areas due to the ground-borne vibration caused by mechanized construction works. Original data from seismic measurements are related to the post-industrial Ostrava agglomeration, in the area of one of the biggest successfully revitalized brownfields in Central Europe. All measurements were evaluated in terms of both amplitude and frequency. The results of all measurements were processed in the form of attenuation curves.

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Section: Discussionmentioning

confidence: 99%

“…These are not the only sources of vibration that can have a negative impact on brownfields. As shown by a number of studies, the most common seismic load on construction sites is road transport [16][17][18], along with railways [19][20][21][22] and trams and subways in urban centers [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Ground-Borne Vibration Due to Construction Works with Respect to Brownfield Areas

2019

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“…A range of fiber optic DAS systems have been described in recent literature and significant progress has been made with respect to signal quality and sensing range. Fiber optic sensing techniques such strain sensors based on Brillouin scattering [7,8], fiber Bragg gratings and fiber interferometers [9,10] have been demonstrated in railway applications. However, most activities in the field of DAS have centered on Raleigh backscatter based (C-OTDR) systems [6,7,11,12].…”

Section: Introductionmentioning

confidence: 99%

Fiber Optic Train Monitoring with Distributed Acoustic Sensing: Conventional and Neural Network Data Analysis

Kowarik

Hussels

Chruscicki

et al. 2020

Sensors

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Distributed acoustic sensing (DAS) over tens of kilometers of fiber optic cables is well-suited for monitoring extended railway infrastructures. As DAS produces large, noisy datasets, it is important to optimize algorithms for precise tracking of train position, speed, and the number of train cars. The purpose of this study is to compare different data analysis strategies and the resulting parameter uncertainties. We present data of an ICE 4 train of the Deutsche Bahn AG, which was recorded with a commercial DAS system. We localize the train signal in the data either along the temporal or spatial direction, and a similar velocity standard deviation of less than 5 km/h for a train moving at 160 km/h is found for both analysis methods. The data can be further enhanced by peak finding as well as faster and more flexible neural network algorithms. Then, individual noise peaks due to bogie clusters become visible and individual train cars can be counted. From the time between bogie signals, the velocity can also be determined with a lower standard deviation of 0.8 km/h. The analysis methods presented here will help to establish routines for near real-time train tracking and train integrity analysis.

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“…The presented comparative study builds on previous research into the suitability of optical fiber devices for vibration monitoring from various sources of dynamic loads. An experimentally developed interferometric sensor was used to measure rock mass dynamic response, whose applicability already has been verified for similar dynamic tasks [17][18][19]. A standard seismic station was then used to compare the results.…”

Section: Introductionmentioning

confidence: 99%

Alternative Approaches to Measurement of Ground Vibrations Due to the Vibratory Roller: A Pilot Study

Nedoma

Stolárik

Kepák

et al. 2019

Sensors

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At present, one of the primary tasks of the construction industry is to build transport infrastructure. This concerns both the construction of new bypasses of towns and the repair of existing roads, which are damaged by congestion, especially by freight transport. Whether it is a new building or a reconstruction, it is always very important to choose a suitable method of subsoil treatment. One of the most commonly used methods for soil treatment is currently compaction using vibratory rollers. This method is very effective both in terms of results and due to its low financial demands compared to other methods. Vibration is transmitted to the surrounding rock environment when compacting the subsoil using vibratory rollers. Although the intensity of these vibrations is not as pronounced as in other methods of subsoil treatment, such vibrations can have a significant effect, for example during compaction in urban areas or in an area with the presence of historical objects. Therefore, it is very advisable to monitor the effect of these vibrations on the environment during construction. This paper brings an original experimental comparative study of standard seismic instrumentation with a developed interferometric sensor for the field of monitoring vibrations generated during compaction of subsoil using vibrating rollers. The paper presents time and frequency domain results, as well as attenuation curves, which represent real attenuation of vibrations in a given rock environment. The results presented here show that a system operating on a different physical principle from the one used at present has the potential to replace the existing, very expensive, seismic equipment.

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Use of Fiber-Optic Sensors for the Detection of the Rail Vehicles and Monitoring of the Rock Mass Dynamic Response Due to Railway Rolling Stock for the Civil Engineering Needs

Cited by 18 publications

References 40 publications

Ground-Borne Vibration Due to Construction Works with Respect to Brownfield Areas

Ground-Borne Vibration Due to Construction Works with Respect to Brownfield Areas

Fiber Optic Train Monitoring with Distributed Acoustic Sensing: Conventional and Neural Network Data Analysis

Alternative Approaches to Measurement of Ground Vibrations Due to the Vibratory Roller: A Pilot Study

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