Temat: vibration response - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Influence of suspended equipment on the carbody vertical vibration behaviour of high-speed railway vehicles
Wpływ wyposażenia zamontowanego w nadwoziu wagonu na charakterystyki drgań pionowych pojazdu szynowego kolei szybkobieżnych
Autorzy:: Dumitriu, M.
Powiązania:: https://bibliotekanauki.pl/articles/139537.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: railway vehicle
flexible carbody
suspended equipment
vertical vibration
frequency response functions
geometric filtering effect
pojazd szynowy
elastyczne nadwozie wagonu
wyposażenie zawieszone
drgania pionowe
funkcje odpowiedzi częstotliwościowej
zjawisko filtracji geometrycznej
Opis:: The equipment mounted on the carbody chassis of the railway vehicles is a critical component of the vehicle in terms of ride comfort. The reason for that is their large mass, able to visibly influence the vibrations mode of the carbody. The paper examines the influence of the equipment upon the mode of vertical vibrations of the carbody in the high-speed vehicles, reached on the basis of the frequency response functions of the acceleration in three carbody reference points – at the centre and above the bogies. These functions are derived from the numerical simulations developed on a rigid-flexible coupled model, with seven degrees of freedom. As a rule, the results herein prove the influence of the equipment mounting mode (rigid or elastic), along with the speed regime, upon the level of vibrations in the carbody reference points, at the resonance frequency of the symmetrical bending mode. Similarly, it is also demonstrated how the equipment mass and the damping degree of the suspension system affect the level of the vibrations in the carbody.
Wyposażenie zamontowane na podwoziu pudła wagonu kolejowego stanowi krytyczny składnik pojazdu gdy chodzi o komfort jazdy. Powodem jest jego znaczna masa, zdolna w istotny sposób wpływać na drgania pojazdu. W artykule badano wpływ wyposażenia na tryb drgań pionowych nadwozia wagonu kolei szybkobieżnych. Za podstawę przyjęto częstotliwościowe funkcje przyspieszenia wyznaczone w trzech punktach odniesienia – w środku pojazdu i ponad wózkami zwrotnymi. Funkcje te zostały wyznaczone na podstawie symulacji numerycznych opracowanych dla sprzężonego sprężysto-sztywnego modelu o siedmiu stopniach swobody. Otrzymane wyniki z reguły potwierdzają, że sposób zamontowania wyposażenia (sztywne lub sprężyste), wraz z warunkami prędkości jazdy, mają wpływ na poziom wibracji w wybranych punktach odniesienia na częstotliwości rezonansowej w symetrycznym trybie zgięciowym. Pokazano także jak masa wyposażenia i stopień tłumienia w systemie jego zawieszenia wpływają na poziom wibracji nadwozia.
Źródło:: Archive of Mechanical Engineering; 2016, LXIII, 1; 145-162
0004-0738
Pojawia się w:: Archive of Mechanical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Effect of the multiple damages and temperature changes on the natural frequency
Autorzy:: Mohammadi Esfarjani, S.
Salehi, M.
Ghassemi, A.
Powiązania:: https://bibliotekanauki.pl/articles/279351.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: structural health monitoring
damage detection
vibration response
temperature
natural frequency
Opis:: Damage detection based on structural dynamic characteristics, such as natural frequencies and mode shapes, is an important area of research. Obtaining accurate structural dynamic characteristics is perhaps the most challenging aspect. In particular, changes in environmental temperature due to seasonal weather or radiation from sunshine leads to changes in the dynamic characteristics of structures. An important conclusion is that changes in the dynamic characteristics of a structure due to damage may be smaller than changes in the dynamic characteristics due to variations in temperature. Also, damage can affect the frequency response. This is the first study of evaluation of the effect of changes in temperature and multiple damages on natural frequency at the same time. In this paper, the simultaneous effect of the multiple defects and temperature on the natural frequencies of 6063 aluminum alloy beam are assessed numerically. ABAQUS finite element software is used for the numerical analysis. The present paper aims to evaluate the temperature effect and multiple damages on vibration responses. The variations in the frequency have been analysed in simulation by using an aluminum specimen and obtaining impedance signatures at temperatures ranging from −200◦C to 204◦C. The results show that an increase in temperature leads to a decrease in structural frequency, and that a decrease in temperature leads to an increase in structural frequency. The evaluation of the effect of multiple defects on natural frequency shows that when damages are created in the structure, there is a significant decrease in the natural frequency responses of the 6063 aluminum alloy beam. The results show that damage causes a decrease in the natural frequency of the structure. This study highlights the importance of applying simulation methods to the evaluation of the effect of changes in environmental temperature and multiple damages on the dynamic characteristics such as natural frequencies and mode shapes, especially at the same time.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 3; 813-822
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Experimental investigation of an automotive magnetorheological shock absorber
Autorzy:: Jastrzębski, Ł.
Sapiński, B.
Powiązania:: https://bibliotekanauki.pl/articles/387105.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: MR shock absorber
vibration
current response
force response
dissipated energy
Opis:: The study summarises the experimental examination of an automotive magnetorheological (MR) shock absorber under electrical and mechanical excitations, investigates its current and force responses and the energy dissipation in the system. The aim of experiments was to acquire measurement data that allows in next step of the research program to engineer an energy harvesting device for the absorber. The work covers basic technical data of the absorber, description of the experimental set-up, scenario of testing program and test results of the device. Of particular importance is the influence the operating current, piston displacement amplitude and piston velocity have on the absorber’s response.
Źródło:: Acta Mechanica et Automatica; 2017, 11, 4; 253-259
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Structural tests of freight wagons on the basis of signals generated by piezoelectric macro fiber composites
Autorzy:: Płaczek, M.
Wróbel, A.
Buchacz, A.
Powiązania:: https://bibliotekanauki.pl/articles/387033.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: dynamic response
freight wagon
piezoelectric transducers
smart materials
analysis of vibration
Opis:: Paper presents a report of a research work that concerns possibilities of freight wagons modernization using new composite materials. The main aim of presented work was to verify the possibility of inference from the dynamic response of the wagon about the changes in its technical condition. During the presented works tests on real objects were carried out using Macro Fiber Composite (MFC) piezoelectric transducers glued to the freight wagon’s frame. The dynamical response of the wagon was measured while the object was driving. On the next stage the measured signal was generated on a laboratory stand using electrodynamic modal shaker and vibrations of the laboratory model were measured. Measured signals were juxtaposed on charts and analysed. The aim of this work was to verify if it is possible to detect the change in the system using measurements of vibrations that are being generated during exploitation of the freight wagon.
Źródło:: Acta Mechanica et Automatica; 2017, 11, 3; 210-216
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Estimation of flow rate through analysis of pipe vibration
Autorzy:: Venkata, S. K.
Navada, B. R.
Powiązania:: https://bibliotekanauki.pl/articles/386332.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: accelerometer
estimation
frequency response
flow rate
neural network
vibration
Opis:: In this paper, implementation of soft sensing technique for measurement of fluid flow rate is reported. The objective of the paper is to design an estimator to physically measure the flow in pipe by analysing the vibration on the walls of the pipe. Commonly used head type flow meter causes obstruction to the flow and measurement would depend on the placement of these sensors. In the proposed technique vibration sensor is bonded on the pipe of liquid flow. It is observed that vibration in the pipe varies with the control action of stem. Single axis accelerometer is used to acquire vibration signal from pipe, signal is passed from the sensor to the system for processing. Basic techniques like filtering, amplification, and Fourier transform are used to process the signal. The obtained transform is trained using neural network algorithm to estimate the fluid flow rate. Artificial neural network is designed using back propagation with artificial bee colony algorithm. Designed estimator after being incorporated in practical setup is subjected to test and the result obtained shows successful estimation of flow rate with the root mean square percentage error of 0.667.
Źródło:: Acta Mechanica et Automatica; 2018, 12, 4; 294-300
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Model order reduction technique applied on harmonic analysis of a submerged vibrating blade
Autorzy:: Tengs, E.
Charrassier, F.
Holst, M.
Storli, P.
Powiązania:: https://bibliotekanauki.pl/articles/265809.pdf
Data publikacji:: 2019
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: wibracje
harmoniczne
silnik FSI
model order reduction
FSI
vibration
harmonic response
Opis:: As part of an ongoing study into hydropower runner failure, a submerged, vibrating blade is investigated both experimentally and numerically. The numerical simulations performed are fully coupled acoustic-structural simulations in ANSYS Mechanical. In order to speed up the simulations, a model order reduction technique based on Krylov subspaces is implemented. This paper presents a comparison between the full ANSYS harmonic response and the reduced order model, and shows excellent agreement. The speedup factor obtained by using the reduced order model is shown to be between one and two orders of magnitude. The number of dimensions in the reduced subspace needed for accurate results is investigated, and confirms what is found in other studies on similar model order reduction applications. In addition, experimental results are available for validation, and show good match when not too far from the resonance peak.
Źródło:: International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 131-142
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: The steam pressure impacts reducing system for a biomass cogenerator based on monitoring of the frequency characteristics of the steam actuator
Autorzy:: Lalik, Krzysztof
Podlasek, Szymon
Goryl, Wojciech
Góra, Grzegorz
Powiązania:: https://bibliotekanauki.pl/articles/128148.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:: steam generator
fault diagnosis
vibration response
biomass
water hammer
wytwornica pary
diagnostyka uszkodzeń
odpowiedź drganiowa
biomasa
uderzenie hydrauliczne
Opis:: Introduced through policy instruments, as well as due to increase awareness of and demand for energy, alternative, renewable energy sources are becoming increasingly popular and necessary. The growing market and standards are forcing producers of renewable energy sources to constantly improve the quality of their products. Biomass trigenerators are one way of obtaining such energy, both in the form of electricity, heat and cold. These are elements generating steam by burning various solid, liquid or gaseous fuels of organic origin. Rotating machines in the form of turbines or steam engines are used to generate electricity. Unfortunately, they are particularly exposed to steam impacts associated with discontinuous work. This article presents the monitoring and prevention system for such impacts. It is based on the analysis of the frequency spectrum of vibrations of such generators and can be used to implement a trigenerator control system that will reduce the influence of such impacts. With proposed diagnostic system, the efficiency and life span of a Renewable Energy Source can increase significantly.
Źródło:: Vibrations in Physical Systems; 2019, 30, 2; 1-7
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Vibration analysis of Kenyir Dam power station structure using a real scale 3D model
Autorzy:: Arbain, Azizi
Ahmad Mazlan, Ahmad Zhafran
Zawawi, Mohd Hafiz
Mohd Radzi, Mohd Rashid
Powiązania:: https://bibliotekanauki.pl/articles/396138.pdf
Data publikacji:: 2019
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: Kenyir Dam power
vibration analysis
dam structures
using 3D model
Frequency Response Function
Finite Element Method
moc Kenyir Dam
analiza drgań
konstrukcja zapory
model 3D
FRF
MES
Opis:: In this paper, the vibration analysis in terms of modal and harmonic responses are investigated for the power station structure of Kenyir Dam in Terengganu, Malaysia. Modal analysis is carried out to provide the dynamic characteristics of the power station which includes the natural frequencies and mode shapes. Meanwhile, the harmonic response analysis is performed by applying the force to the structure to obtain the Frequency Response Function (FRF) in certain range of frequencies. A real scale threedimensional (3D) model of the Kenyir Dam power station is constructed using Solid Works software and imported to ANSYS software for the Finite Element (FE) analysis. A proper boundary condition is taken into consideration to demonstrate the real behaviour of the power station structure. From the results, six most significant natural frequencies and mode shapes including the FRF in all three axes are selected. The highest natural frequency value occurred at 5.4 Hz with the maximum deflection of 0.90361 m in the z axis direction. This value is important in order to verify whether the structure can overcome the resonance phenomenon from the external disturbance forces in the future.
Źródło:: Civil and Environmental Engineering Reports; 2019, 29, 3; 48-59
2080-5187
2450-8594
Pojawia się w:: Civil and Environmental Engineering Reports
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Dynamic response analysis of drill pipe considering horizontal movement of platform during installation of subsea production tree
Autorzy:: Wang, Fei
Chen, Neng
Powiązania:: https://bibliotekanauki.pl/articles/1585045.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: SPT installation
drill pipe
dynamic response
vibration range
bending stress
Opis:: In order to study the dynamic response of a drill pipe under the motion of the float platform, current and waves during the installation of a subsea production tree (SPT), a numerical model was established to analyse the mechanical properties of the drill pipe. The effects of the float platform motion on the mechanical behaviours of the drill pipe are carried out as well as the operation depth, submerged weight of the SPT, current velocity and drill pipe specification. At the same time, the evolution mechanism of the dynamic response of the drill pipe was also explored. The results show that the bending stress of the drill pipe approaches the maximum value when the platform moves to about one fourth of its period. Based on the research, the deeper the operation depth, the smaller the range of motion of the bottom of the drill pipe; the current velocity and the size of drill pipe have the greatest influence on the lateral displacement and bending stress.
Źródło:: Polish Maritime Research; 2020, 3; 22-30
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Transient analysis of transversely functionally graded Timoshenko beam (TFGTB) in conjunction with finite element method
Autorzy:: Khafaji, Salwan Obaid Waheed
Al-Shujairi, Mohammed A.
Aubad, Mohammed Jawad
Powiązania:: https://bibliotekanauki.pl/articles/140231.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: FGM beam
transient response
free vibration
fundamental frequency
finite element method
Timoshenko beam theory
Opis:: In this work, transient and free vibration analyses are illustrated for a functionally graded Timoshenko beam (FGM) using finite element method. The governing equilibrium equations and boundary conditions (B-Cs) are derived according to the principle of Hamilton. The materials constituents of the FG beam that vary smoothly along the thickness of the beam (along beam thickness) are evaluated using the rule of mixture method. Power law index, slenderness ratio, modulus of elasticity ratio, and boundary conditions effect of the cantilever and simply supported beams on the dynamic response of the beam are studied. Moreover, the influence of mass distribution and continuous stiffness of the FGM beam are deeply investigated. Comparisons between the current free vibration results (fundamental frequency) and other available studies are performed to check the formulation of the current mathematical model. Good results have been obtained. A significant effect is noticed in the transient response of both simply supported and cantilever beams at the smaller values of the power index and the modulus elasticity ratio.
Źródło:: Archive of Mechanical Engineering; 2020, LXVII, 3; 299-321
0004-0738
Pojawia się w:: Archive of Mechanical Engineering
Dostawca treści:: Biblioteka Nauki

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