Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Vibrations" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 55
Tytuł:
The influence of vibrations generated by handheld household appliances on temperature changes of user hands
Autorzy:
Wojsznis, M.
Mazurek, I.
Różański, L.
Barczewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/128172.pdf
Data publikacji:
2018
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
vibrations
thermography
household appliances
drgania
termografia
sprzęt AGD
Opis:
The paper presents an analysis of influence of vibrations generated by small hand-held household appliances on temperature changes of hands. To visualize thermal changes of operators’ hands a thermographic camera was used. During the tests values of acceleration of device handle vibrations at points of contact with operators’ hands were recorded simultaneously. It has been observed that even during short periods of work the hand temperature changes significantly. The biggest recorded change was equal to 3°C. The tests have shown that the influence of vibrations is in this case sensed more strongly particularly by fingers and a wrist. The analysis of results has shown purposefulness of pointing out synergistic influence of vibrations and thermal changes caused by commonly available appliances on a human body.
Źródło:
Vibrations in Physical Systems; 2018, 29; 1-8
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free vibrations of column built out pipe and rod with two-parametric elastic connector
Autorzy:
Uzny, S.
Powiązania:
https://bibliotekanauki.pl/articles/127780.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
column
free vibrations
elastic connector
kolumna
drgania swobodne
łącznik elastyczny
Opis:
In this paper the geometrically nonlinear system subjected to compressive external Euler's load has been investigated. The column is composed of pipe and rod. The rod is concentrically installed in the pipe. Between pipe and rod at given distance from the end of the column the two-parametric elastic connector has been placed. The numerical calculations were performed for different parameters of the system on the basis of free vibration boundary problem. The parameters are as follows: spring stiffness (translational and rotational) which models elastic connector, coefficient of asymmetry flexural rigidity, location of the connector.
Źródło:
Vibrations in Physical Systems; 2014, 26; 311-318
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling and numerical simulation of parametric resonance phenomenon in vibrating screen
Autorzy:
Bąk, Ł.
Noga, S.
Stachowicz, F.
Powiązania:
https://bibliotekanauki.pl/articles/128078.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
screen
parametric resonance
forced vibrations
przesiewacz
rezonans parametryczny
drgania wymuszone
Opis:
In this paper the numerical studies of parametric resonance phenomenon in vibrating screen are presented. Numerical simulations are performed in Ansys Workbench software. Modal analysis is carried out to find the natural frequencies and mode shapes of the sieve. The effect of the excitation frequency on the sieve vibrations in parametric resonance conditions was investigated using the transient analysis. The comparison of numerical and experimental results is presented. It is shown, that two mode shapes of sieve vibrations occur close to the screen operation frequency. Linear dependence between excitation frequency and sieve vibration frequency is obtained. The most stable transient response and the highest vibration amplitude of the sieve is obtained for excitation frequency 47.07 Hz. The range of excitation of parametric resonance is nearly the same as for experimental data.
Źródło:
Vibrations in Physical Systems; 2016, 27; 35-40
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear vibrations of rotating system near resonance
Autorzy:
Starosta, R.
Sypniewska-Kamińska, G.
Powiązania:
https://bibliotekanauki.pl/articles/128157.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
nonlinear vibrations
asymptotic methods
resonance
drgania nieliniowe
metoda asymptotyczna
rezonans
Opis:
The paper concerns analysis of nonlinear vibration of the rotating system consisted of two disks and shaft. The analytical multiple time scale method is applied to the analysis dynamics of the system near main resonance. The transition phenomenon depending on the value of the nonlinearity parameter is discussed. All the analytical results have been confirmed numerically.
Źródło:
Vibrations in Physical Systems; 2014, 26; 265-272
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibrations of sandwich plates - comparison of chosen modelling approaches
Autorzy:
Marczak, J.
Powiązania:
https://bibliotekanauki.pl/articles/128250.pdf
Data publikacji:
2018
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
sandwich plates
vibrations
modelling approach
płyta sandwiczowa
drgania
podejście modelujące
Opis:
Sandwich plates are certain specific type of composites, which are widely used in modern engineering. Due to their complicated multi-layered structure, in literature one can find many different modelling approaches: from a simple double-plate system to a complex theories based on complicated deformation hypothesis. In this paper the modelling of vibrations of sandwich plates is considered, as a brief resume of assumptions of several models along with their governing equations of motion are presented. In the calculation example the free vibrations of a certain sandwich plate strip are investigated with the use of all described models and additionally with the use of FEM model. Eventually, basing on the presented comparison of the obtained results, the discussion on the correctness of each modelling assumption is made.
Źródło:
Vibrations in Physical Systems; 2018, 29; 1-9
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the variability of the shape of short axisymmetric rods on the value of basic natural frequency of longitudinal vibrations
Autorzy:
Kozień, Marek S.
Powiązania:
https://bibliotekanauki.pl/articles/2146624.pdf
Data publikacji:
2021
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
rods
longitudinal vibrations
natural frequencies
pręty
drgania wzdłużne
drgania własne
Opis:
Rods with a relatively short length in relation to their transverse dimensions with a variable cross-section along the axis, subjected to longitudinal vibrations, have the character of stocky rods, for which the classic geometric principles used for rods are not fully met. For small engineering elements, the postulated design frequencies of natural vibrations in the very high cycle fatigue analyses reach the values of a dozen or so, small, several dozen kHz. In the article, the sensitivity of the value of the basic natural frequency to the change in the shape of the element is analysed and discussed. The analysis is conducted using finite element method.
Źródło:
Vibrations in Physical Systems; 2021, 32, 2; art. no. 2021212
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of characteristic vibration signal parameters during transport of fruit and vegetable
Autorzy:
Idaszewska, Natalia
Szymański, Grzegorz M.
Powiązania:
https://bibliotekanauki.pl/articles/2146635.pdf
Data publikacji:
2020
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
transport of fruit and vegetables
vibrations
transport owoców i warzyw
drgania
Opis:
The occuring vibrations during the transport of fruit and vegetables contributes to damage and accelerates their deterioration. In order to protect transported products against negative changes caused by vibrations during transport, it is necessary to know the values of these vibrations. The article presents the identified characteristic parameters of the vibration signal during transport of fruit and vegetables. The experimental investigations of the actual mechanical loads were carried out on various roads during transport by selected vehicles. Vibration spectra that represented the relation between the acceleration amplitudes and the vibration frequencies were obtained and analyzed. The vibration spectral analysis identified characteristic repetitive values of vibration signal parameters.
Źródło:
Vibrations in Physical Systems; 2020, 31, 1; art. no. 2020111
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The vibrations and the stability of a flat frame type gamma realizing the Euler’s load taking into account the vulnerability of the structural node connecting the pole and the bolt of the system
Autorzy:
Szmidla, J.
Wiktorowicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/127752.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
flat frame
free vibrations
Euler's load
rama płaska
drgania swobodne
obciążenie eulerowskie
Opis:
The paper presents the results of theoretical research and numerical calculations of the vibration and the stability of a twin rod flat frame subjected to the Euler's load. Considering the total mechanical energy of the system and using the kinematic stability criterion (Hamilton's principle) is determined by the equations of motion and boundary conditions considered system. The results of numerical calculations are presented at selected geometrical and physical parameters in the system for selected values of the rotary spring stiffness modeling the structural rigidity of the node connecting bolt with the column of frame.
Źródło:
Vibrations in Physical Systems; 2014, 26; 297-304
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model and dynamical analysis of a tattooing device
Autorzy:
Sarbinowski, F.
Starosta, R.
Powiązania:
https://bibliotekanauki.pl/articles/127882.pdf
Data publikacji:
2018
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
nonlinear dynamics
vibrations
design optimization
tattoo
dynamika nieliniowa
drgania
optymalizacja konstrukcji
tatuaż
Opis:
The paper presents the physical model of the tattooing device. The model is described by three degrees of freedom and a series of linear and nonlinear dynamic parameters and excitation, whose values are determined – depending on the available data and resources – by analytical, numerical and experimental methods. There are also presented a solution of motion equations and the assessment of the impact of individual parameters on the nature of solutions, and moreover, it is indicated a modification of the structure, the use of which results in decrease the amplitudes of the body structure vibrations.
Źródło:
Vibrations in Physical Systems; 2018, 29; 1-9
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geometrically nonlinear free transversal vibrations of thin-walled elongated panels with arbitrary generatrix
Autorzy:
Marchuk, M.
Goriachko, T.
Pakosh, V.
Powiązania:
https://bibliotekanauki.pl/articles/128061.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
elongated panels
vibrations
nonlinearity
perturbation method
panele podłużne
drgania
nieliniowość
metoda perturbacji
Opis:
The algorithm for finding a finite number of the first values of natural frequencies and forms of geometrically nonlinear free transverse vibrations of thin-walled elongated panels with arbitrary generatrix is proposed and verified. Under normal coordinate quadratic the approximation of displacements is used. Along the tangential coordinates used one-dimensional finite elements. The discrete variation problem is built. For its solving the perturbation method is applied. The numerical results are compared with previously obtained by other authors.
Źródło:
Vibrations in Physical Systems; 2014, 26; 153-160
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of vibration transmission in an air-operated demolition hammer
Autorzy:
Tabaszewski, M.
Wojsznis, M.
Powiązania:
https://bibliotekanauki.pl/articles/128111.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
vibrations
dynamic inputs
short-time Fourier transform
STFT
drgania
krótkoczasowa transformata Fouriera
Opis:
The paper presents an analysis of vibrations of a ram, body and handle of a heavy, air-operated demolition hammer. The research was conducted in order to determine the character of dynamic inputs and resulting vibrations at the tool handle which were necessary to build a structural model of local influences on an operator taking the hammer design into account. The experiment was carried out on a test stand without participation of an operator, which guaranteed repeatability of measurements and elimination of ontogenetic characteristics. The displacements of selected structural elements of the tool were recorded by means of a camera and the accelerations at the handle were recorded by means of a standard measuring apparatus. The recorded signals were subjected to the spectral analysis and the short-time Fourier transform (STFT) using dedicated software in MATLAB environment.
Źródło:
Vibrations in Physical Systems; 2016, 27; 385-390
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of pre-stress on stability and vibration of geometric nonlinear column at a load force directed to the positive pole
Autorzy:
Szmidla, J.
Cieślińska-Gąsior, I.
Powiązania:
https://bibliotekanauki.pl/articles/127836.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
free vibrations
geometrically non-linear system
prestressing
drgania swobodne
układ geometrycznie nieliniowy
sprężanie
Opis:
The subject of the results of theoretical and numerical studies measures to designate the effect of pre-stress on the vibration of geometrically non-linear column exposed to the load force directed to the positive pole. Considering the total mechanical energy of the system the equation of motion and the boundary conditions necessary to solve the boundary problem were determined. Based on the kinetic stability criterion the range of values of internal compression forces was determined in which the growth of critical load of the column above the local loss of stability was achieved. In the research the geometrically non-linear system was analysed with variable asymmetry of bending stiffness and at selected values of geometrical parameters of the head realizing the load.
Źródło:
Vibrations in Physical Systems; 2014, 26; 289-296
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of vibrations of plate strip with concentrated masses using tolerance averaging technique
Autorzy:
Marczak, J.
Jędrysiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/127860.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
periodic plate strips
vibrations
tolerance averaging technique
płyta periodyczna
drgania
technika tolerancyjnego uśredniania
Opis:
In this note vibrations of thin periodic plate strips with periodically distributed system of two concentrated masses are analysed. Moreover, it is assumed that every concentrated mass is connected to a string, which cause the effect of damping in vibrations. Governing equation for such structure is defined as a differential equation with highly oscillating, periodic and non-continuous coefficients. In order to solve the equation, tolerance averaging technique is applied. As a result, governing equations with constant coefficients are obtained. In an example, derived model is used to calculate lower and higher frequencies of the travelling wave related to the internal periodic structure.
Źródło:
Vibrations in Physical Systems; 2014, 26; 161-168
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regular and chaotic dynamics of a 4-DOF mechanical system with dry friction
Autorzy:
Kosińska, A.
Awrejcewicz, J.
Grzelczyk, D.
Powiązania:
https://bibliotekanauki.pl/articles/950423.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
periodicity
quasiperiodicity
chaos
hyperchaos
non-regular vibrations
okresowość
quasi-okresowość
hiperchaos
drgania nieliniowe
Opis:
In this paper the model of four degree-of-freedom mechanical sliding system with dry friction is considered. One of the components of the mentioned system rides on driving belt, which is driven at constant velocity. This model corresponds to a row of carriage laying on a guideway, which moves at constant velocity with respect to the guideway as a foundation. From a mathematical point of view the analyzed problem is governed by four second order differential equations of motion, and numerical analysis is performed in Mathematica software. Some interesting behaviors are detected and reported using Phase Portraits, Poincaré Maps and Lyapunov Exponents. Moreover, Power Spectral Densities obtained by the Fast Fourier Transform technique are reported. The presented results show different behaviors of the system, including periodic, quasi-periodic and chaotic orbits.
Źródło:
Vibrations in Physical Systems; 2016, 27; 195-202
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The opinion of impact of energy dissipation in a vehicle suspension on mechanical energy transfer
Autorzy:
Warczek, Jan
Powiązania:
https://bibliotekanauki.pl/articles/127680.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
energy of mechanical vibrations
vehicle suspension
damping
energia drgań mechanicznych
zawieszenie pojazdu
tłumienie
Opis:
Effective shock absorption of the body in the presence of excitations of a random nature results in the necessity of using vibration dampers. The classic solution is the viscous damper, which works by dissipating mechanical energy in the form of heat generated to the external environment. The characteristics of the flexible components in car suspensions (elastic and damping) affect the transfer of mechanical energy. The purpose of the research was to develop a method for assessing the impact of damping in a suspension system on the transfer of mechanical energy from unsprung masses to the body. The assumed research goal was carried out on a vehicle model with two degrees of freedom, whose parameters corresponded to the real object. The developed method uses energy relationships occurring between selected variables of the vibrating motion of inertial elements of a motor vehicle. The results obtained during simulation tests were empirically verified on a real object. The proposed method allows to assess how the damping in the suspension system affects the energy relationships occurring in the vehicle suspension vibrating motion.
Źródło:
Vibrations in Physical Systems; 2019, 30, 2; 1-10
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 55

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies