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Search Results: 1 - 10 of 219 matches for " Przemyslaw Perlikowski "
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Analysis of transition between different ringing schemes of the church bell
Piotr Brzeski,Tomasz Kapitaniak,Przemyslaw Perlikowski
Physics , 2015,
Abstract: In this paper we investigate dynamics of church bells, characterize their most common working regimes and investigate how to obtain them. To simulate the behavior of the yoke-bell-clapper system we use experimentally validated hybrid dynamical model developed basing on the detailed measurements of the biggest bell in the Cathedral Basilica of St Stanislaus Kostka, Lodz, Poland. We introduce two parameters that describes the yoke design and the propulsion mechanism and analyze their influence on the systems' dynamics. We develop two-parameter diagrams that allow to asses conditions that ensures proper and smooth operation of the bell. Similar charts can be calculated for any existing or non-existing bell and used when designing its mounting and propulsion. Moreover, we propose simple and universal launching procedure that allows to decrease the time that is needed to reach given attractor. Presented results are robust and indicate methods to increase the chance that the instrument will operate properly and reliably regardless of changes in working conditions.
Synchronous motion of two vertically excited planar elastic pendula
Marcin Kapitaniak,Przemyslaw Perlikowski,Tomasz Kapitaniak
Physics , 2012, DOI: 10.1016/j.cnsns.2012.12.030
Abstract: The dynamics of two planar elastic pendula mounted on the horizontally excited platform have been studied. We give evidence that the pendula can exhibit synchronous oscillatory and rotation motion and show that stable in-phase and anti-phase synchronous states always co-exist. The complete bifurcational scenario leading from synchronous to asynchronous motion is shown. We argue that our results are robust as they exist in the wide range of the system parameters.
Synchronization of two self-excited double pendula
Piotr Koluda,Przemyslaw Perlikowski,Krzysztof Czolczynski,Tomasz Kapitaniak
Physics , 2014, DOI: 10.1140/epjst/e2014-02129-7
Abstract: We consider the synchronization of two self-excited double pendula. We show that such pendula hanging on the same beam can have four different synchronous configurations. Our approximate analytical analysis allows us to derive the synchronization conditions and explain the observed types of synchronization. We consider an energy balance in the system and describe how the energy is transferred between the pendula via the oscillating beam, allowing thus the pendula synchronization. Changes and stability ranges of the obtained solutions with increasing and decreasing masses of the pendula are shown using path-following.
The dynamics of co- and counter rotating coupled spherical pendulums
Blazej Witkowski,Przemyslaw Perlikowski,Awadhesh Prasad,Tomasz Kapitaniak
Physics , 2014, DOI: 10.1140/epjst/e2014-02136-8
Abstract: The dynamics of co- and counter-rotating coupled spherical pendulums (two lower pendulums are mounted at the end of the upper pendulum) is considered. Linear mode analysis shows the existence of three rotating modes. Starting from linear modes allow we calculate the nonlinear normal modes, which are and present them in frequency-energy plots. With the increase of energy in one mode we observe a symmetry breaking pitchfork bifurcation. In the second part of the paper we consider energy transfer between pendulums having different energies. The results for co-rotating (all pendulums rotate in the same direction) and counter-rotating motion (one of lower pendulums rotates in the opposite direction) are presented. In general, the energy fluctuations in counter-rotating pendulums are found to be higher than in the co-rotating case.
The dynamics of the pendulum suspended on the forced Duffing oscillator
Piotr Brzeski,Przemyslaw Perlikowski,Serhiy Yanchuk,Tomasz Kapitaniak
Physics , 2012, DOI: 10.1016/j.jsv.2012.07.021
Abstract: We investigate the dynamics of the pendulum suspended on the forced Duffing oscillator. The detailed bifurcation analysis in two parameter space (amplitude and frequency of excitation) which presents both oscillating and rotating periodic solutions of the pendulum has been performed. We identify the areas with low number of coexisting attractors in the parameter space as the coexistence of different attractors has a significant impact on the practical usage of the proposed system as a tuned mass absorber.
DelayAndPeriodicity
S. Yanchuk,P. Perlikowski
Physics , 2009, DOI: 10.1103/PhysRevE.79.046221
Abstract: Systems with time delay play an important role in modeling of many physical and biological processes. In this paper we describe generic properties of systems with time delay, which are related to the appearance and stability of periodic solutions. In particular, we show that delay systems generically have families of periodic solutions, which are reappearing for infinitely many delay times. As delay increases, the solution families overlap leading to increasing coexistence of multiple stable as well as unstable solutions. We also consider stability issue of periodic solutions with large delay by explaining asymptotic properties of the spectrum of characteristic multipliers. We show that the spectrum of multipliers can be splitted into two parts: pseudo-continuous and strongly unstable. The pseudo-continuous part of the spectrum mediates destabilization of periodic solutions.
Le Je(u) des voix dans le discours d’après la Théorie polyphonique
Przemyslaw Skinder
Synergies Espagne , 2008,
Abstract: Résumé : L’objectif principal de cet article est d’analyser la complexité etla multiplicité de différents sujets, Je parlant dans un même énoncé.Après un bref rappel de quelques conceptions abordant la question du sujetparlant , nous allons nous référer à la Théorie Scandinave de la PolyphonieLinguistique, héritière de la pensée philosophique et de concepts linguistiquesde Bakhtine. Nous allons aussi évoquer la grande influence d’Oswald Ducrotsur la terminologie et les méthodologies employées aujourd’hui par plusieursscientistes s’occupant du phénomène du Je qui s’exprime. Notre intentionest également de faire voir au lecteur que même si un énoncé quelconquesemble être précisément attribué à un sujet parlant, celui-ci peut englober,sous l’emblème du locuteur , de nombreuses instances discursives chargéesde la responsabilité de points de vue exprimés.Resumen : El objetivo principal de este artículo es el análisis de la complejidad y lamultiplicidad de diferentes sujetos Yo hablando en un mismo enunciado. Tras un breveapunte de algunas teorías que abordan la cuestión del sujeto hablante , vamos a referirnosa la teoría escandinava de la polifonía lingüística, heredera del pensamiento filosófico y deconceptos lingüísticos de Bakhtine. También vamos a evocar la gran influencia de OswaldDucrot en la terminología y las metodologías empleadas hoy en día por varios estudiososdel fenómeno del Yo que se expresa. Nuestra intención es así mismo la de hacer veral lector que incluso cuando un enunciado cualquiera parece atribuirse justamente a unsujeto hablante, éste puede englobar, bajo la etiqueta de locutor , numerosas instanciasdiscursivas encargadas de la responsabilidad de los puntos de vista expresados.Abstract : The main purpose of the following article is to share the complexity andmultiplicity of subjects responsible for different voices heard inside a human enunciation.We will review main aspects of previous theories regarding such issue, before referring to basic principles of Scandinavian Theory of Linguistic Polyphony, direct continuer ofBakhtine’s philosophical and linguistic ideas. The great contribution of Oswald Ducrot tocontemporary methodology and terminology will be also mentioned. Finally, the objectiveof this article is to demonstrate that even if an enunciation seems to be attributed tothe clearly defined subject, this one includes many other hidden/concealed subjectscharged of responsibility for expressed perspectives and various points of vue.
Orphism as a scientific paradigm
Biernat Przemyslaw
Littera Antiqua , 2012,
Abstract: In my essay I would like to examine current interpretative paradigm, which western scholarship cast on heterogenous and ambiguous data first to create and then to modify the notion of ‘orphism’. In case of paradigms preceding the actual one, the role which ‘orphism’ played in contemporary theories and controversies centered around the question of its significance for emergence of Christianity is well known. That is why in my work I would like to focus on deconstruction of interpretative consensus, elaborated in recent years, which is to be found in such works as Martin West’s The Orphic Poems (1983), Ritual Texts for the Afterlife. Orpheus and the Bacchic Gold Tablets by Fritz Graf and Sarah Iles-Johnston (2007) or monumental Orfeo y la tradición órfica. Un reencuentro (2008) edited by Alberto Bernabé. What is significant, inasmuch as we can write the history of Athenian religion or the history of Hellenistic kings’ worship, we still cannot write the history of orphism. In formulation of all these scholars it is an ahistorical phenomenon, a hidden constant in the sphere of Greek religion, never expressed directly and entirely, but always alluded to y ancient authors. I find difficult to agree with such a statement. The aim of my inquiry is to reveal assumptions of current paradigm, which are hidden in it, but leave a distinct impression on data.
Exact Motion Planning with Rotations: the Case of a Rotating Polyhedron
Przemyslaw Dobrowolski
Lecture Notes in Engineering and Computer Science , 2012,
Abstract:
An Algorithm for Computing the Exact Configuration Space of a Rotating Object in 3-space
Przemyslaw Dobrowolski
IAENG International Journal of Computer Science , 2012,
Abstract:
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