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1
Podatność dynamiczna obustronnie podpartej belki z tłumieniem w ruchu unoszenia
Żółkiewski S.
Modelowanie Inżynierskie
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2009
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T. 7, nr 38
321-328
PL
Podatność dynamiczna jest jedną z szeroko stosowanych metod analizy dynamicznej [1-3, 6-7], dzięki której możliwe staje się określenie wzajemnych relacji pomiędzy amplitudą drgań a częstotliwością wymuszenia. W pracy zamodelowano układ obustronnie podpartej belki, znajdującej się na obrotowym stole, wraz z uwzględnieniem w modelu sił tłumiących amplitudy przemieszczenia. Belka znajduje się na obrotowym stole obracającym się ze stałą prędkością kątową. Rozważany ruch ograniczono do ruchu płaskiego, natomiast belkę do belki o przekroju symetrycznym, stałym na jej całej długości.
EN
One of the most widely used method of dynamical analysis is the dynamical flexibility method [1-3, 6-7], thanks to this method we can determine mutual relations between an amplitude of vibrations and a frequency of load. In this thesis there was modeled the two-sided supported beam being on the rotational table. In this model there were took into consideration the damping forces. The beam is on the rotational table that rotates with constant angular velocity. Considered motion is limited to plane motion and the beam has a symmetrical cross-section constant on its whole length.
2
Content available remote Dynamical analysis of the free-free damped transverse vibratory beam in transportation
Żółkiewski S.
Archives of Control Sciences
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2009
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Vol. 19, no. 4
423-436
EN
One of the most popular method of vibrating systems analysis is dynamical flexibility method. This method makes possible the assignment of stability bands. The thesis is applied to the free-free damped beam systems analysis. The beam is loaded by transversal unitary force in accordance with a dynamical flexibility definition. In a mathematical model Coriolis forces, centrifugal forces and damping forces were took into the consideration. The damping forces enable active vibration control and can change dynamical characteristics of the system.
3
Content available remote Dynamical Flexibility of the Damped Rod System in Transportation
Żółkiewski S.
Machine Dynamics Problems
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2008
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Vol. 32, No. 1
121-128
EN
One of the most popular method of analyzing vibrations and dynamical states of systems is the method of dynamical flexibility. There is considered the system of damped rod in rotational transportation. The dynamical flexibility was derived from previously recognized equations of motion. Dynamical characteristics were presented in form of charts of attenuation depending on frequency. There were compared the known characteristics of stationary systems with characteristics of systems in rotational transportation without the damping and also with characteristics of rotating systems with taking into consideration the damping.
4
Content available remote Mechanical systems vibrating longitudinally with the transportation effect
Buchacz A., Żółkiewski S.
Journal of Achievements in Materials and Manufacturing Engineering
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2007
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Vol. 21, nr 1
63-66
EN
Purpose: High work speeds of mechanisms, using materials with high flexibility, high precision of work, etc. are the cause of searching of the new ways of modelling. One of these ways is presented in this thesis. The main purpose of this thesis is the dynamical analysis with taking into consideration the interaction between main motion and local vibrations during the model is loaded by longitudinal forces. Design/methodology/approach: Derived equations of motion were made by classical methods, with generalized coordinates and generalized velocities assumed as orthogonal projections of individual coordinates and velocities of the rod and manipulators to axes of the global inertial frame. Findings: Mathematical model of the longitudinally vibrating systems in terms of plane motion can be put to use to derivation of the dynamical flexibility of these systems, and also those equations are the starting point to the analysis of complex systems, especially we can use those equations to derivation of the substitute dynamical flexibility of n-linked systems in transportation. Research limitations/implications: In the thesis were considered mechanical systems vibrating longitudinally in terms of rotation. Next problem of dynamical analysis is the analysis of systems in non-planar transportation and systems loaded by transversal forces. Practical implications: Results of this thesis can be put to use into machines and mechanisms in transportation such as: wind power plant, high speed turbines, rotors, manipulators and in aerodynamics issues, etc. Originality/value: Up to now there were analyzed beams and rods in a separate way, first main motion of the system and after that the local vibrations. The new approach of modelling were presented by authors of this thesis, a new modelling took into consideration the interaction between those two displacements. There was defined the transportation effect for models vibrating longitudinally in this thesis.
5
Content available remote Podatność dynamiczna swobodnej belki drgającej giętnie z uwzględnieniem ruchu unoszenia
Żółkiewski S.
Górnictwo Odkrywkowe
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2006
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R. 48, nr 7-8
187-190
PL
Rozważa się model belki swobodnej drgającej giętnie. Belka jest obciążona harmoniczną siła poprzeczną i znajduje się w ruchu, który w pracy jest traktowany jako ruch unoszenia. Belka jest wykonana z jednorodnego tworzywa a jej przekrój poprzeczny jest całkowicie wypełniony. Opisano ruch belki z uwzględnieniem jej odkształcalności oraz wpływu ruchu unoszenia.
EN
In this thesis the transversally vibrations of the beam were considered. The beam was loaded by the harmonic bending force and one was in motion which was considered as transportation. The beam was made by homogenous elastic material and one has a full section. Analysis of mechanism's vibrations was made with taking into consideration the transportation effect.
6
Content available remote Wyznaczanie podatności ramion robota n-ogniwowego metodą sieciową
Buchacz A., Wróbel A.
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
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2005
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z. 65 [222]
25-28
EN
In the paper analysis process of continuous systems with transverse vibrations applicalion of the malrix method was described. For determination of flexibility of the n-elements robot's arms the hyper graph aggregation method was showed. As a final point the flexibility for the complex systems calculation was derived.
7
Content available remote Wyznaczanie podatności dynamicznej drgającej giętnie belki metodą Galerkina
Buchacz A., Żółkiewski S.
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
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2005
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z. 65 [222]
37-44
EN
The paper concerns the problem of determining the dynamical flexibility of elastic beams. The standard method ot separation of variables and the Galerkin method were used. The considered systems are elastic beams with symmetrical sections. Beams were weighted down by the harmonic bending forces and the model of beam was described in one global reference system.
8
Content available remote Podatność dynamiczna belki drgającej giętnie w ruchu unoszenia
Buchacz A., Żółkiewski S.
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
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2005
|
z. 65 [222]
29-36
EN
In this thesis characteristics of dynamical flexibility with taking into consideration the transportation effect were presented. The considered system is the elastic beam with a symmetrical section. The beam was weighted down by the harmonic bending force and the model of mechanism was described in two reference systems: global and local.
9
Podatność dynamiczna belki o odcinkowo-nieliniowo zmiennym przekroju jako wprowadzenie do badania manipulatorów robotów metodą hipergrafów
Buchacz A.
Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska
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2001
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z. 15
41-46
PL
Badając drgające ogniwa robotów, stosuje się często modele tych obiektów w postaci prętów czy belek o odcinkowo stałym przekroju. Takie podejście jest często zbyt odległym przybliżeniem zmienności przekroju tych obiektów, a wyznaczone charakterystyki nie opisują w sposób zadowalający zachowania badanego układu. Aby uściślić analizę modeluje się ogniwo o zmiennym przekroju pojedynczą belką o różnych postaciach funkcji, określającej jego zmienność. W pracy przedstawiono sposób wyznaczenia podatności dynamicznych belki w przypadku zmiany przekroju według funkcji f(x) = ex.
EN
In the research of vibrating links of robots, with nonlinear changeable sections, models with segments of constant section are often applied. Such an approach may be far too inadequate to approximate sections changes, so the determined dynamic characteristics do not describe the behavior of the investigated system in a satisfactory way. To make the analysis more precise, the investigated object with changeable sections is replaced by a single bar or with a various-form function describing the section change. In the paper the way of determination of dynamical flexibilities of beam with changeable sections according to function f(x) = ex has been shown.
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