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Polioptymalizacja procesu wtryskiwania tworzyw termoplastycznych

100%

Bogucki M. , Samociuk W. , Stączek P. , Krzysiak Z.

Przemysł Chemiczny

2021

tom T. 100, nr 3

225--229

Dokonano optymalizacji procesu wtryskiwania tworzyw termoplastycznych ze względu na zmniejszenie skurczu przetwórczego oraz zwiększenie wytrzymałości mechanicznej wyprasek. W badaniach zastosowano efektywne plany badań doświadczalnych pozwalające na konstrukcję modeli empirycznych charakterystyk jakości procesu i oszacowanie ich ekstremów lokalnych. Na tej podstawie utworzono wielokryterialną funkcję celu, którą wykorzystano do wyznaczenia warunków prowadzenia procesu wtryskiwania. Położenie sąsiedztwa ekstremum potwierdzono doświadczalnie.

Redn. of shrinkage and increase of tension strength of moulds were used as criteria of polioptimalization of injection moulding. The soln. of the problem relied upon the response surface of methodol. As a result, empirical models of 2 criterials were developed and then applied to construction of an objective function. A neighborhood of extreme and its corresponding value were estd. and confirmed by an addn. exptl. run.

Research on the Use of Multifrequency Excitations for Energy Harvesting in a Combustion Engine

88%

Caban J. , Stączek P. , Wolszczak P. , Nowak R. , Karczmarzyk S.

Advances in Science and Technology. Research Journal

2024

tom Vol. 18, no 5

400--412

Research conducted around the world shows that energy harvesting (EH) systems can be used in modern vehicles powered by combustion, hybrid or electric engines. The efficiency of modern combustion engines is about 40%, the rest of the energy is lost and can be recovered to some extent. Therefore, the search is ongoing for systems that will use this part of the energy to power specific systems or micro-sensors installed in the vehicle. The article presents the possibilities of energy recovery from such vehicle systems as: energy recovered during braking, damping energy in the vehicle suspension, energy recovery from the exhaust system of an internal combustion engine and energy from the vibrations of the internal combustion engine. Based on the analysis of the literature on the presented research of various scientific centers and the author's experiment, it can be concluded that there is a huge potential for obtaining thermal energy from the engine exhaust system and the vehicle suspension system. A field that has not been explored much, but according to the authors also has energy potential, is energy recovery from the combustion engine suspension system in the vehicle's engine compartment. Preliminary research shows the possibility of mounting the energy recovery system in the engine compartment and the potential possibility of obtaining electricity in certain operating states of the combustion engine.

Impact-based piezoelectric energy harvesting system excited from diesel engine suspension

75%

Caban J. , Litak G. , Ambrożkiewicz B. , Gardyński L. , Stączek P. , Wolszczak P.

Applied Computer Science

2020

tom Vol. 16, no 3

16--29

Vibration energy harvesting systems are using real ambient sources of vibration excitation. In our paper, we study the dynamical voltage response of the piezoelectric vibrational energy harvesting system (PVEHs) with a mechanical resonator possessing an amplitude limiter. The PVEHs consist of the cantilever beam with a piezoelectric patch. The proposed system was subjected to the inertial excitation from the engine suspension. Impacts of the beam resonator are useful to increase of system’s frequency transition band. The suitable simulations of the resonator and piezoelectric transducer are performed by using measured signal from the engine suspension. Voltage outputs of linear (without amplitude limiter) and nonlinear harvesters were compared indicating better efficiency of the nonlinear design.