1. |
Ostrowski M., Błachowski B., Popławski B., Pisarski D., Mikułowski G., Jankowski Ł., Semi‐active modal control of structures with lockable joints: general methodology and applications,
STRUCTURAL CONTROL AND HEALTH MONITORING, ISSN: 1545-2255, DOI: 10.1002/stc.2710, pp.e2710-1-24, 2021 Streszczenie: In this study, a novel modal control strategy by means of semi-actively lockable joints is proposed. The control strategy allows for a directed flow of energy between vibrational modes, which makes it suitable not only for vibration attenuation purposes but also for energy scavenging driven by electromechanical energy harvesters. The proposed control strategy is an extension of the prestress-accumulation release (PAR) technique; however, it introduces also new concepts that increase the efficiency of the overall control system. Contrary to the PAR, the proposed method requires measurement of both strains in the vicinity of the semi-active joints and translational velocities that provide global information about system behavior. The latter aspect requires the control system to be organized within a hierarchical feedback architecture. The benefit from this higher complexity of the control system is its better performance compared to the PAR. The proposed semi-active modal control not only attenuates structural vibration faster, but it also achieves this goal with a smaller number of switches implemented in the joints. The effectiveness of the proposed methodology has been demonstrated on structures equipped with two lockable joints. Two practical examples have been investigated: one employs the concept of vibration-based energy harvesting for a two-story frame structure, while the second one reduces vibration of an eight-story frame structure subjected to kinematic excitation. Słowa kluczowe: energy harvesting, lockable joint, modal coupling, semi-active control, vibration attenuation Afiliacje autorów:
Ostrowski M. | - | IPPT PAN | Błachowski B. | - | IPPT PAN | Popławski B. | - | IPPT PAN | Pisarski D. | - | IPPT PAN | Mikułowski G. | - | IPPT PAN | Jankowski Ł. | - | IPPT PAN |
|  | 140p. |
2. |
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 Streszczenie: 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. Słowa kluczowe: optimal sensor placement, effective independence method, Fisher information matrix Afiliacje autorów:
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 |
|  | 140p. |
3. |
Ostrowski M., Błachowski B., Bocheński M.♦, Piernikarski D.♦, Filipek P.♦, Janicki W.♦, Design of nonlinear electromagnetic energy harvester equipped with mechanical amplifier and spring bumpers,
BULLETIN OF THE POLISH ACADEMY OF SCIENCES: TECHNICAL SCIENCES, ISSN: 0239-7528, DOI: 10.24425/bpasts.2020.135384, Vol.68, No.6, pp.1-11, 2020 Streszczenie: The main drawback of vibration-based energy harvesting is its poor efficiency due to small amplitudes of vibration and low sensitivity at frequencies far from resonant frequency. The performance of electromagnetic energy harvester can be improved by using mechanical enhancements such as mechanical amplifiers or spring bumpers. The mechanical amplifiers increase range of movement and velocity, improving also significantly harvester efficiency for the same level of excitation. As a result of this amplitude of motion is much larger comparing to the size of the electromagnetic coil. This in turn imposes the need for modelling of electromagnetic circuit parameters as the function of the moving magnet displacement. Moreover, high velocities achieved by the moving magnet reveal nonlinear dynamics in the electromagnetic circuit of the energy harvester. Another source of nonlinearity is the collision effect between magnet and spring bumpers. It has been shown that this effect should be carefully considered during design process of the energy harvesting device. The present paper investigates the influence of the above-mentioned nonlinearities on power level generated by the energy harvester. A rigorous model of the electromagnetic circuit, derived with aid of the Hamilton's principle of the least action, has been proposed. It includes inductance of the electromagnetic coil as the function of the moving magnet position. Additionally, nonlinear behaviour of the overall electromagnetic device has been tested numerically for the case of energy harvester attached to the quarter car model moving on random road profiles. Such a source of excitation provides wide band of excitation frequencies, which occur in variety of real-life applications. Słowa kluczowe: energy harvesting, velocity amplification, nonlinear electromagnetic circuit, spring bumper, quarter car model Afiliacje autorów:
Ostrowski M. | - | IPPT PAN | Błachowski B. | - | IPPT PAN | Bocheński M. | - | Lublin University of Technology (PL) | Piernikarski D. | - | inna afiliacja | Filipek P. | - | Lublin University of Technology (PL) | Janicki W. | - | inna afiliacja |
|  | 100p. |
4. |
Ostrowski M., Błachowski B., Jankowski Ł., Pisarski D., Modal energy transfer by controlled structural connections,
DIAGNOSTYKA, ISSN: 1641-6414, DOI: 10.29354/diag/116692, Vol.21, No.1, pp.61-70, 2020 Streszczenie: This paper describes a semi-active control strategy that allows to transfer the vibration energy from an arbitrarily induced to a selected structural mode. The intended aim of the proposed control strategy is energy harvesting from structural vibrations. Another potential application is related to structural safety. In the paper, a mathematical model is first introduced to describe the phenomenon of vibrational energy transfer, and then, based on this model, an efficient semi-active control strategy is proposed. Finally, some problems related to measurement techniques are discussed. The effectiveness of the proposed methodology is demonstrated in an example of energy transfer between vibrational modes of a three-bar planar frame structure. Słowa kluczowe: vibration energy, modal control, lockable joint, modal coupling Afiliacje autorów:
Ostrowski M. | - | IPPT PAN | Błachowski B. | - | IPPT PAN | Jankowski Ł. | - | IPPT PAN | Pisarski D. | - | IPPT PAN |
|  | 20p. |
5. |
Błachowski B., Ostrowski M., Tauzowski P., Świercz A., Jankowski Ł., Sensor placement for structural damage identification by means of topology optimization,
AIP Conference Proceedings, ISSN: 0094-243X, DOI: 10.1063/5.0007817, Vol.2239, No.1, pp.020002-1-11, 2020 Streszczenie: The success of virtually all structural health monitoring (SHM) methods depends on the information content of the measurements, and thus on the placement of the available sensors. This paper presents an efficient method for finding optimal sensor distribution over structural system with many degrees of freedom (DOFs). The objective function is based on the classical Fisher information matrix. Originally, this yields a computationally hard discrete optimization problem. However, the proposed numerical solution method is based on a concept taken from structural topology optimization, where a discrete optimization problem is replaced with a continuous one. Two numerical examples demonstrate the effectiveness of the proposed methodology. These are a 5-bay truss with 24 DOFs and a two-story frame structure whose finite element model has been condensed to 14 DOFs. Słowa kluczowe: optimal sensor placement, structural damage identification, topology optimization Afiliacje autorów:
Błachowski B. | - | IPPT PAN | Ostrowski M. | - | IPPT PAN | Tauzowski P. | - | IPPT PAN | Świercz A. | - | IPPT PAN | Jankowski Ł. | - | IPPT PAN |
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6. |
Bocheński M.♦, Augustyniak M.♦, Ostrowski M., Jarzyna W.♦, The influence of control algorithms on the effectiveness of vibration reduction of an active composite beam,
PRZEGLĄD ELEKTROTECHNICZNY, ISSN: 0033-2097, DOI: 10.15199/48.2016.08.45, No.8, pp.166-169, 2016 Streszczenie: The paper presents application of the MFC actuator and selected control algorithms to the suppression of the composite cantilever beam vibrations. The first part concentrates on the identification of the real structure’s parameters. The numerical model is based on the Euler-Bernoulli beam theory with a nonlinear curvature component. The second part draws on numerical simulations and leads to the identification of optimal control parameters. Finally, the determined parameters are examined in an experimental laboratory system equipped with a DSP controller. Słowa kluczowe: MFC actuator, control algorithm, active beam, DSP controller Afiliacje autorów:
Bocheński M. | - | Lublin University of Technology (PL) | Augustyniak M. | - | Induster Sp. z o.o. (PL) | Ostrowski M. | - | IPPT PAN | Jarzyna W. | - | Lublin University of Technology (PL) |
|  | 14p. |
7. |
Filipek P.Z.♦, Ostrowski M.♦, Optimal energy source for an environmentally-friendly go-kart,
Journal of Ecological Engineering, ISSN: 2299-8993, DOI: 10.12911/22998993/65454, Vol.17, No.5, pp.90-95, 2016 Streszczenie: A method for a sizing of an electromechanical battery for electrical go-kart was presented in the paper. The main goal of this research was to replace the internal combustion (IC) engine by an electric drive system taking into account the traction properties, on the one hand and the duration of operation on a single charge and the number of the battery life cycles on the other. The proposed method permits an entire depreciation of the price of the vehicle before the degradation of the battery occurs. The results of the study have been used to adjust the source for electric go-karts that will be mass produced. Słowa kluczowe: electrical vehicle, go-kart, optimal battery sizing, traction simulation Afiliacje autorów:
Filipek P.Z. | - | Lublin University of Technology (PL) | Ostrowski M. | - | inna afiliacja |
|  | 12p. |
8. |
Ostrowski M., Jarzyna W.♦, Redukcja drgań obiektu nieliniowego z regulatorem adaptacyjnym proporcjonalno-różniczkującym o strukturze MRAS,
IAPGOŚ, ISSN: 2083-0157, DOI: 10.5604/20830157.1194278, Vol.6, No.1, pp.51-54, 2016 Streszczenie: W artykule zaprezentowano metodę adaptacji algorytmu sterowania aktuatorem MFC służącym do redukcji drgań nieliniowych belki wysięgnikowej. Zastosowany opis matematyczny regulatora PD zaprojektowano jako strukturę MRAS, a algorytm adaptacji oparty jest o zasadę Lapunowa. Przeprowadzone badania symulacyjne określiły odporność algorytmu na błędy modelowania oraz na występujące w rzeczywistych systemach opóźnienia sprzętowe. Słowa kluczowe: regulacja adaptacyjna, algorytm adaptacji Lapunowa, drgania belki wysięgnikowej, aktuator MFC Afiliacje autorów:
Ostrowski M. | - | IPPT PAN | Jarzyna W. | - | Lublin University of Technology (PL) |
|  | 7p. |