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1
Content available remote Influence of Vibration of Links on Mechanism Motion
Hać M.
Machine Dynamics Research
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2018
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Vol. 42, No. 4
93--100
EN
In this paper a finite element method with 2D beam elements is derived for flexible planar linkages for the case of mutual dependence between rigid and elastic motions. For this purpose both rigid body and elastic degrees of freedom are considered as generalized coordinates during the derivation procedure and are substituted to the Gibbs-Appel equation. This procedure requires formulation of the shape functions for rigid body motion of finite elements. The numerical calculations are conducted for the case of planar slidercrank mechanism with the goal of determining the influence of the vibration of links on the mechanism motion. The results of numerical simulation show that for transient analysis the influence for large displacement mechanism motion has limited impact.
2
Content available remote Dynamic Analysis of Slider-Crank Mechanism: Finite Element and Multibody Approaches
Hać M., Łazęcki J.
Machine Dynamics Research
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2016
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Vol. 40, No. 4
113--120
EN
A dynamic analysis of a slider-crank mechanism is presented in this paper. Two modelsare taken for consideration: stick model built of beam-type planar finite elements, and solid model. The first model is solved by the Authors’ original programs written in Matlab programming language. The second model is analysed in the Adams/Ansys environment. The mechanism is driven by a variant torque applied to the crank, and vibrational transient response is analysed. The midpoint deflection of connecting rod is compared for both models.
3
Content available remote Stability of Flexible Mechanisms in View of Classic al Analysis of Parametric Vibration
Hać M.
Machine Dynamics Research
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2013
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Vol. 37, No. 4
43-52
EN
In this paper the stability analysis of flexible mechanisms is considered. The equations of motion of parametric vibration for dynamic stability are presented and as an example a slider-crank mechanism circulating at crank’s constant angular speed is considered. In order to obtain the critical running speeds the Fourier series method is used. The results show that the main resonance appears for the operating speed a little greater than double average value of the first natural frequency of the system.
4
Mechanizmy protokołu z Kioto w polskim systemie prawnym
Grzybek I.
Bezpieczeństwo Pracy i Ochrona Środowiska w Górnictwie
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2013
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nr 2
13-17
PL
Ratyfikując Protokół z Kioto, Polska zobowiązała się m.in. do stworzenia podstaw prawnych stosowania w kraju mechanizmów elastycznych, tj. handlu emisjami (ET), wspólnych wdrożeń (JI) i mechanizmu czystego rozwoju (CDM). Ponieważ równocześnie jest członkiem Unii Europejskiej to, tworząc te podstawy, była zobligowana do dokonania tego zgodnie z unijnymi, nieco odmiennymi uregulowaniami, a głównie z dyrektywą 2003/87/WE. Łącząc te odmienne regulacje, w Polsce stworzono dość skomplikowany, lecz logiczny i spójny system prawny. Jego porównanie z systemami UE i Protokołu z Kioto ilustruje, jak umowy międzynarodowe wpływają na kształt krajowych regulacji prawnych.
EN
Making the Kyoto Protocol validated Poland obligates itself, among others, to construction the legal base for implementation of elastic mechanisms in the state. As the member of European Union, Poland nas at the same time been obliqued to make the construction in accordance with EU regulations (mainly the 2003/87/WE directive), a little different then the regulations of Kyoto Protocol. Linking those different regulations, there has been created complex, but logical and compact legal system in Poland. The comparison of it to the regulations of the protocol and the directive illustrates how the international treaties influence the shape of the state regulations.
5
Content available remote Modeling of Driving Mechanism of Oscillatory Air-Compressor
Hać M., Łazęcki J., Ostapski W.
Machine Dynamics Problems
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2009
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Vol. 33, No. 3
13-24
EN
In the paper the dynamic analysis of driving mechanism of oscillatory air-compressor is under investigation. There are taken into account two cases: the simplified one for symmetric connecting rod of driving mechanism, and the asymmetric case. The stick model consisting of beam elements is considered and the results are compared with the solid model analysed in Adams/Ansys enviroment. The analysis shows that for symmetric case the stick model gives relaiable results when compered to the solid model, however for non-symmetric case the differences are more significant.
6
Modelowanie ruchu mechanizmów z członami podatnymi z zastosowaniem MES
Hać M., Osiński J.
Zeszyty Naukowe. Mechanika / Politechnika Opolska
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2001
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z. 64
153-160
PL
W pracy przedstawiono zastosowanie MES do analizy układów z ruchomymi członami.
EN
In the work the method of modelling of motion of mechanisms with taking into account flexibility of links is presented.
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