Piotr Wolszczak

Lublin University of Technology

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Grzegorz Litak

Lublin University of Technology

Jerzy Margielewicz

Silesian University of Technology

Damian Gąska

Silesian University of Technology

KŁ

Krystian Łygas

Lublin University of Technology

Tomasz Cholewa

Lublin University of Technology

Piotr Muryjas

Lublin University of Technology

Shengxi Zhou

Zhengzhou University

Andrzej Smolarz

Lublin University of Technology

A. Cholewa

Lublin University of Technology

Bartłomiej Ambrożkiewicz

Lublin University of Technology

Cooperative Institutions

Lublin University of Technology

Medical University of Lublin

Maria Curie-Skłodowska University

Silesian University of Technology

ORCID

Instytut Medycyny Wsi im. Witolda Chodźki

Bialystok University of Technology

University of Economics and Innovation

Brno University of Technology

Northwestern Polytechnical University

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Robust optimization and uncertainty quantification in the nonlinear mechanics of an elevator brake system

Meccanica (2019)

Piotr Wolszczak Paweł Lonkwic Américo Cunha Grzegorz Litak Szymon Molski

This paper deals with nonlinear mechanics of an elevator brake system subjected to uncertainties. A deterministic model that relates the braking force with uncertain parameters is deduced from mechanical equilibrium conditions. In order to take into account parameters variabilities, a parametric probabilistic approach is employed. In this stochastic formalism, the uncertain parameters are modeled as random variables, with distributions specified by the maximum entropy principle. The uncertainties are propagated by the Monte Carlo method, which provides a detailed statistical characterization of the response. This work still considers the optimum design of the brake system, formulating and solving nonlinear optimization problems, with and without the uncertainties effects.

Uncertainty Quantification

Elevator

10.1007/s11012-019-00992-7

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Citations (15)

Assessment of Lift Passenger Comfort by the Hilbert–Huang Transform

Journal of Vibration Engineering & Technologies (2019)

Kamil Szydło Piotr Wolszczak Rafał Longwic Grzegorz Litak Mieczysław Dziubiński

Abstract Purpose The comfort of lift passengers has a significant effect on their general health condition as well as stress levels during travel. This study reports the results of vibration measurements taken during travel in a passenger lift. Methods Vibration signals were analyzed by the empirical mode decomposition method and the Hilbert transform. Results Selected modes from the Hilbert spectral analysis were compared with the resonance frequencies of human body organs (range 20–90 Hz) as well as with the resonance frequencies of lift components. Conclusion The use of Hilbert spectral analysis enables the isolation of individual signal components and the determination of the dominant frequency in the signal. This, in turn, allows for the isolation of raw vibration frequencies from the signal that are particularly significant for passenger comfort assessment (resonance frequencies of human body organs) and analysis of their occurrence.

Lift (data mining)

Hilbert spectral analysis

SIGNAL (programming language)

10.1007/s42417-019-00184-3

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Citations (12)

Influence of the configuration of elastic and dissipative elements on the energy harvesting efficiency of a tunnel effect energy harvester

Chaos Solitons & Fractals (2023)

Jerzy Margielewicz Damian Gąska Grzegorz Litak Daniil Yurchenko Piotr Wolszczak

Mechanical energy

Energy transformation

10.1016/j.chaos.2022.113060

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Citations (6)

Assessment of the Distribution of Nanofibers in Membranes Based on Microstructure Photos

IOP Conference Series Materials Science and Engineering (2018)

Piotr Wolszczak Cristobal Garcia

This paper presents a methodology for estimation of fibers distribution in fibrous mat. Distribution of fibers is important for the mechanical and electrical properties of created new materials. For this study, membranes of polyvinylidene fluoride and polyvinyl pyrrolidone nanofibers with different sizes and random orientation are prepared via electrospinning. The fiber distribution evaluation of the membranes was based on microstructure photos. The developed method can be used as a practical tool to estimate the distribution of fibers.

Polyvinylidene fluoride

Electrospinning

10.1088/1757-899x/416/1/012048

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Citations (1)

Cutting fluids

Mechanik (2015)

Piotr Wolszczak Paweł Szalczyński Stanisław Płaska

Zadaniem substancji chłodzącej podczas obróbki skrawaniem jest odprowadzania ciepła, smarowanie powierzchni narzędzia i transport wiórów.W artykule przedstawiono wyniki pomiaru chropowatości powierzchni obrabianej z chłodzeniem cieczą i obrabianej bez chłodzenia, o łącznej liczbie 120 pomiarów

10.17814/mechanik.2015.3.131

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Citations (0)

Subharmonic responses of a nonlinear energy harvester with an asymmetric double well potential

Journal of Physics Conference Series (2022)

Grzegorz Litak Jerzy Margielewicz Damian Gąska Jacek Caban Piotr Wolszczak

Abstract A nonlinear energy harvester with asymmetric potential wells is studied numerically. An energy transducing piezoelectric patch is attached to the cantilever elastic beam to harvest kinetic energy of the moving frame. To obtain an asymmetric effect in the double well potential induced by permanent magnets, an elastic ferromagnetic beam resonator misaligned with respect to the magnets' distribution axis of symmetry was used. The system response under the frequency-swept excitation reporting bifurcations to subharmonic and chaotic solutions was analysed. The sensitivity of the system solutions to the parameters responsible for potential asymmetry and electro-mechanical coupling was also investigated.

Subharmonic

10.1088/1742-6596/2412/1/012014

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Citations (2)

Vibration energy harvesting system with cyclically time-varying potential barrier

Applied Energy (2024)

Jerzy Margielewicz Damian Gąska Tomasz Haniszewski Grzegorz Litak Piotr Wolszczak

10.1016/j.apenergy.2024.123384

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Citations (1)

Training of the neural network system in the task of detecting blue stain in a sawmill wood inspection system

Piotr Wolszczak Grzegorz Kotnarowski Arkadiusz Małek Grzegorz Litak Agnieszka Posturzyńska

The article presents the operation of the automatic pine sawn timber inspection system, which was developed at the Woodinspector company and offered commercially. The vision inspection system is used to detect various wood defects, including knots, blue stain, and mechanical damage caused by worms. Blue stain is a defect that is difficult to detect based on the color of the wood, because it can be easily confused with wood defects or dirt that do not impair its strength properties. In particular, the issues of detecting blue stain in wood, the use of artificial neural networks and improving the operation of the system in production conditions were discussed.

Stain

10.20944/preprints202402.0035.v1

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Citations (1)

Influence of forecast control of heat supply on supply temperature

2022 7th International Conference on Smart and Sustainable Technologies (SpliTech) (2021)

Tomasz Cholewa A. Cholewa Andrzej Smolarz Piotr Muryjas Piotr Wolszczak

The forecast regulation of heat supply is very important and relevant research topic, because the energy savings may be achieved especially in the existing buildings but also in the new one. This work shows the influence of forecast control on the level of supply temperature of the heating medium. The analyzed multifamily building has a central heating installation with vertical risers in each flat and convective radiators, which are supplied with the heating medium (80/60°C). The field measurements were performed for the period before and after installation of forecast control of heating system in order to show the advantages of this solution.

Heating system

Energy supply

10.23919/splitech52315.2021.9566407

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Citations (1)

Energy harvesting from an oscillating vertical piezoelectric cantilever with clearance

De Gruyter eBooks (2018)

Krystian Łygas Piotr Wolszczak P. Stączek Grzegorz Litak

Vibration energy harvesting is proposed for a nonlinear electromechanical system. A mechanical resonator, which is realized as an inverted elastic pendulum excited by kinematic excitation, is characterized for a broad frequency band due to clearance and impact interactions. The moving frame induces pendulum beam deflection, and mechanical stress is converted into an electrical voltage by a piezoelectric patch. Finally, the output power is dissipated on the load resistor. The results of electric power and voltage outputs for various frequencies of kinematic excitations of the frame are shown. In the assumed working conditions, the system described transforms the input frame displacement frequency into the higher harmonics of beamdeflection.

Pendulum

Mechanical energy

10.1515/9783110445053-007

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Citations (1)