Papers by Jarosław Bednarz
Computer Assisted Mechanics and Engineering Sciences, 2007
IOP Conference Series: Materials Science and Engineering, 2013
ABSTRACT This work presents a self-tuning feedwater heater model. This work continues the work on... more ABSTRACT This work presents a self-tuning feedwater heater model. This work continues the work on first-principle gray-box methodology applied to diagnostics and condition assessment of power plant components. The objective of this work is to review and benchmark the optimization algorithms regarding the time required to achieve the best model fit to operational power plant data. The paper recommends the most effective algorithm to be used in the model adjustment process.
Journal of KONES. Powertrain and Transport, 2012
Journal of KONES. Powertrain and Transport, 2013
Journal of KONES. Powertrain and Transport, 2012
Journal of KONES. Powertrain and Transport, 2012
Condition Monitoring of Machinery in Non-Stationary Operations, 2012
Key Engineering Materials, 2005
ABSTRACT
Key Engineering Materials, 2009
ABSTRACT The performance of many mechanical structures highly depends on weather conditions in re... more ABSTRACT The performance of many mechanical structures highly depends on weather conditions in region of operation. One of the main limiting factors of their performance in cold regions is the icing process. Icing of structures can be a reason of mechanical and electrical failures and can be dangerous for people working closely to, for instance, rotating wind turbine blades. To prevent de-icing process an inspection system informing about the possibility of collecting ice on surface of operating structures is of particular interest. The following work considers a numerical modeling approach and experimental investigations of the ice detection and de-icing process. The proposed numerical model is based on the cohesive-zone approach used to simulate the delamination at the ice/aluminum interface. Model parameters are specified in terms of fracture energy as a function normal and shear deformation at the interface. A linear elastic traction separation law prior to damage and progressive degradation of the material stiffness after failure is assumed. The ice detection and removal is accomplished by ultrasonic waves excited by the piezoelectric transducers. The experimental results for aluminum plate with ice layers are presented. The results confirmed possibility of icing identification by means of piezoelectric transducers, although ice removal effectiveness depends on the thickness of ice layers. Finally, a proposal of a new deicing adaptive system is given.
Tłumienie dźwięków oraz drgań materiałowych ma znaczący wpływ na jakość pracy maszyn i urządzeń m... more Tłumienie dźwięków oraz drgań materiałowych ma znaczący wpływ na jakość pracy maszyn i urządzeń mechanicznych oraz komfort pracy ich operatorów. W artykule przedstawiono metodę tłumienia drgań materiałowych, polegająca na zastosowaniu kompozytów elastomerowych wylewanych w miejscu ich zastosowania. Opracowana metoda została wykorzystana do wytłumienia drgań materiałowych konstrukcji wsporczej hybrydowego robota frezującego o pięciu stopniach swobody. W artykule przedstawiono konstrukcję hybrydowego robota frezującego konstruowanego w Katedrze Robotyki i Mechatroniki AGH oraz wstępne badania dotyczące zastosowania kompozytów elastomerowych do tłumienia drgań materiałowych na przykładzie elementów konstrukcji wsporczej robota.
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Papers by Jarosław Bednarz