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1
Content available remote Methodology for modeling and determining the frequency response trace of robotic composite structures
Khayrnasov Kamil
Przegląd Elektrotechniczny
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2020
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R. 96, nr 10
39--42
EN
The methodology of modeling and determining the natural frequencies of oscillations of a robotic structure made of composite material including motors, bearings, gears, and ratio changers is considered. The vibration forms of a multi-stage bench for semi-natural modeling from composite material determined using the finite element method are presented. The developed methods allow the study of complex robotic systems of homogeneous and composite materials.
PL
Rozważana jest metodologia modelowania i określania naturalnych częstotliwości drgań konstrukcji robotycznej wykonanej z materiału kompozytowego, w tym silników, łożysk, kół zębatych i zmieniaczy przełożeń. Opracowane metody pozwalają na badanie złożonych systemów robotycznych z materiałów jednorodnych i kompozytowych.
2
Content available Numerical investigation of the free vibration of partially clamped rectangular plates
Gharaibeh M. A., Obeidat A. M., Obaidat M. H.
International Journal of Applied Mechanics and Engineering
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2018
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Vol. 23, no. 2
385--400
EN
This paper studies the free vibration characteristics of rectangular plates with partially clamped edges around the corners using the finite element method. ANSYS Parametric Design Language (APDL) was utilized to produce the finite element (FE) models and to run the analysis. The FE models were used to obtain the plate first natural frequency and mode shape. A comprehensive investigation of the effect of the plate geometric parameters and different boundary condition properties on the natural frequency and mode shapes is presented. The results showed that the vibration characteristics of the structure are greatly dependent on the plate size and the constraint properties.
3
Content available Natural transverse vibrations of helical springs in sections covered with elastic coatings
Michalczyk K.
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2017
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Vol. 65, nr 6
949--959
EN
It has been demonstrated in previous studies that local elastomer coatings covering the end coils of helical springs can efficiently reduce the amplitudes of circum-resonant vibrations in such springs. The analysis of the influence that elastic coatings have on the frequencies and modes of natural transverse vibrations of springs is presented in this paper. The concept of the equivalent beam of the Timoshenko type is utilized in calculations of the frequencies and modes of transverse vibrations. The model developed allows users to determine the frequencies and modes of symmetric as well as antisymmetric vibrations of axially loaded springs with elastic coatings of arbitrary length. A comparison of the results obtained using FEM analysis, in which the model represented the actual spring geometry, with the results obtained by means of the presented model indicates its high accuracy.
4
Content available Dynamic characteristics of the technological complex based on parallel mechanisms of kinematics
Gurzhіj A. A., Strutins'kij S. V.
Problemy Eksploatacji
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2014
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no. 1
57--69
EN
The technique and results of experimental studies of dynamic characteristics of spatial Drive Systems, which includes six coordinate parallel kinematic machine and system manipulation as six coordinate table. The amplitude-frequency and impulse response relative movement of the table and platform machine based on the analysis of characteristics from the mathematical model of the spatial system drive as the transfer function and defines the numerical parameters of the model. Technological complex spatial systems, drives, frequency response, pulse characteristics, natural frequencies, damping parameters, mathematical models, transfer functions.
PL
W artykule przedstawiono metodykę oraz wyniki badań eksperymentalnych charakterystyki dynamicznej przestrzennych systemów napędowych maszyny, na które składa się sześć współrzędnych równoległej kinematyki i manipulacji systemu. Częstotliwości i amplitudy odpowiedzi impulsowej względnego ruchu maszyny, obejmującej stolik oraz platformę ustalono na podstawie analizy cech modelu matematycznego systemowego dysku przestrzennego, który traktowano jako funkcję przenoszenia umożliwiającą zdefiniowanie parametrów numerycznych modelu.
5
Content available The vibration of prototype aircraft propeller speed reduction unit – test bench and FEM numerical simulation study
Ostapski W., Aromiński A., Dowkontt S.
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2014
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Vol. 62, nr 4
861--873
EN
The results of torsional shaft vibration bench tests for a prototype aircraft propeller speed reduction unit are presented in this paper. The study was conducted as a function of engine speed and lubrication conditions. 3D model of the propeller speed reduction unit was developed. By using the finite element method, normal modes frequencies were defined. The simulation was conducted both unloaded and loaded under nominal power conditions.
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