Transfer energii modalnej za pomocą sterowanych połączeń konstrukcyjnych

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.Niniejszy artykuł opisuje półaktywną strategię sterowania umożliwiającą transfer energii z dowolnej wzbudzonej postaci do innej wybranej postaci drgań własnych konstrukcji. Proponowana strategia sterowania może być wykorzystana w celu pozyskiwania energii z drgań konstrukcji. Inne potencjalne zastosowanie związane jest z kwestiami bezpieczeństwa konstrukcji. W artykule najpierw wprowadzony jest model matematyczny opisujący zjawisko transferu energii drgań, a następnie, w oparciu o ten model, przedstawiona jest efektywna strategia sterowania półaktywnego. Na koniec omówiono zagadnienia związane z technikami pomiarowymi. Skuteczność proponowanej metodologii pokazano na przykładzie transferu energii pomiędzy postaciami drgań płaskiej ramy portalowej

Mechanical vibrations: recent trends and engineering applications

Although the study of oscillatory motion has a long history, going back four centuries, it is still an active subject of scientific research. In this review paper prospective research directions in the field of mechanical vibrations were pointed out. Four groups of important issues in which advanced research is conducted were discussed. The first are energy harvester devices, thanks to which we can obtain or save significant amounts of energy, and thus reduce the amount of greenhouse gases. The next discussed issue helps in the design of structures using vibrations and describes the algorithms that allow to identify and search for optimal parameters for the devices being developed. The next section describes vibration in multi-body systems and modal analysis, which are key to understanding the phenomena in vibrating machines. The last part describes the properties of granulated materials from which modern, intelligent vacuum-packed particles are made. They are used, for example, as intelligent vibration damping devices.Web of Science701art. no. e14035