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Piotr Olaszek, PhD, DSc

Instytut Badawczy Dróg i Mostów (PL)


Recent publications
1.  Błachowski B., Świercz A., Ostrowski M., Tauzowski P., Olaszek P., Jankowski Ł., Convex relaxation for efficient sensor layout optimization in large‐scale structures subjected to moving loads, Computer-Aided Civil and Infrastructure Engineering, ISSN: 1093-9687, DOI: 10.1111/mice.12553, Vol.35, No.10, pp.1085-1100, 2020

Abstract:
This paper proposes a computationally effective framework for load‐dependent optimal sensor placement in large‐scale civil engineering structures subjected to moving loads. Two common problems are addressed: selection of modes to be monitored and computational effectiveness. Typical sensor placement methods assume that the set of modes to be monitored is known. In practice, determination of such modes of interest is not straightforward. A practical approach is proposed that facilitates the selection of modes in a quasi‐automatic way based on the structural response at the candidate sensor locations to typical operational loads. The criterion used to assess sensor placement is based on Kammer's Effective Independence (EFI). However, in contrast to typical implementations of EFI, which treat the problem as a computationally demanding discrete problem and use greedy optimization, an approach based on convex relaxation is proposed. A notion of sensor density is applied, which converts the original combinatorial problem into a computationally tractable continuous optimization problem. The proposed framework is tested in application to a real tied‐arch railway bridge located in central Poland.

Keywords:
optimal sensor placement, effective independence method, Fisher information matrix

Affiliations:
Błachowski B. - IPPT PAN
Świercz A. - IPPT PAN
Ostrowski M. - IPPT PAN
Tauzowski P. - IPPT PAN
Olaszek P. - Instytut Badawczy Dróg i Mostów (PL)
Jankowski Ł. - IPPT PAN
2.  Olaszek P., Wyczałek I., Sala D., Kokot M., Świercz A., Monitoring of the static and dynamic displacements of railway bridges with the use of inertial sensors, SENSORS, ISSN: 1424-8220, DOI: 10.3390/s20102767, Vol.20, No.10, pp.2767-1-24, 2020

Abstract:
In the case of the monitoring of bridges, the determination of vertical displacements is one of the most important issues. A new measuring system has been developed and implemented for assessment of railway bridges based on measurements of the structural response to passing trains. The system uses inertial sensors: Inclinometers and accelerometers that do not need any referential points. The system records signals related to the passage of a train over a monitored bridge. The signals from inclinometers before the train's entry are used to determine the static movement. Integrated signals from inclinometers and accelerometers are used to determine dynamic displacements when the train goes through the bridge. Signals from inclinometers are used to determine the so-called "quasi-static" component of the displacement and signal from the accelerometer to determine the dynamic component. Field tests have been carried out on a viaduct along a high-speed railway line. Periodic comparative measurements are carried out using a Total Station to verify static measurements and using inductive sensors to verify dynamic measurements. Tests of the system carried out so far have proven its usefulness for monitoring bridges in a high-speed railway (up to 200 km/h) with high accuracy while determining dynamic displacements.

Keywords:
bridge monitoring, dynamic and static displacements, inertial sensors, total station, indirect measurement

Affiliations:
Olaszek P. - Instytut Badawczy Dróg i Mostów (PL)
Wyczałek I. - Poznan University of Technology (PL)
Sala D. - IPPT PAN
Kokot M. - IPPT PAN
Świercz A. - IPPT PAN
3.  Olaszek P., Świercz A., Wyczałek I., Kołakowski P., Szadkowski K., Moduł pomiaru i oceny odpowiedzi eksploatowanych kolejowych konstrukcji mostowych, Mosty, ISSN: 1896-7663, Vol.3-4, pp.22-26, 2017

Conference papers
1.  Olaszek P., Świercz A., Sala D., Kokot M., System monitorowania łukowego wiaduktu kolejowego na linii wysokiej prędkości, WDM'17, WROCŁAWSKIE DNI MOSTOWE - Mosty. Przemiany w projektowaniu i technologiach budowy, 2017-11-28/11-29, Wrocław (PL), pp.481-488, 2017

Abstract:
The article presents the railway bridge structures monitoring system, which takes advantage of the dynamic response measurement and evaluation method. The monitoring system is focused on steel structures with the spans exceeding 30 m. The elaboration of the method which uses inclinometers together with an accelerometer for indirect displacement measurement under the dynamic load is the main achievement of the project.

Keywords:
monitoring, railway bridges, inclinometer, accelerometer

Affiliations:
Olaszek P. - Instytut Badawczy Dróg i Mostów (PL)
Świercz A. - IPPT PAN
Sala D. - other affiliation
Kokot M. - other affiliation

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