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Wyszukujesz frazę "damping vibration" wg kryterium: Temat


Wyświetlanie 1-9 z 9
Tytuł:
Factors effecting internal damping in aluminium
Czynniki wpływające na poziom tłumienia wewnętrznego w aluminium
Autorzy:
Colakoglu, M.
Powiązania:
https://bibliotekanauki.pl/articles/280653.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
aluminum
damping
vibration
Opis:
The internal damping of metallic materials varies with many different environmental effects. These are the frequency, amplitude of strain or stress, and temperature. In addition, internal damping is effected by corrosion fatigue, grain size, and porosity. The damping also depends on the number of fatigue cycles. There is a functional relationship among the damping, number of cycles and applied stress. In this study, these seven different environmental factors and their effects on the damping are analysed in the case of 6061 aluminium alloy. The relationships between the damping and every single effective factor are complex and vary depending on the aluminium type.
Tłumienie wewnętrzne w materiałach metalicznych zmienia się w zależności od wpływu wielu czynników środowiskowych. Czynnikami tymi mogą być częstość i amplituda przykładanego naprężenia i odkształcenia oraz temperatura. Ponadto na tłumienie wewnętrzne wpływa zmęczenie korozyjne, rozmiar ziarna i porowatość materiału. Tłumienie zależy również od liczby zrealizowanych cykli zmęczeniowych. Istnieje funkcyjna relacja pomiędzy wartością współczynnika tłumienia a liczbą cykli i stanem naprężenia. W pracy zaprezentowano siedem różnych czynników środowiskowych decydujących o poziomie tłumienia wewnętrznego na przykładzie stopu aluminium 6061. Zależności pomiędzy współczynnikiem tłumienia a każdym z tych czynników z osobna okazały się dość skomplikowane i wrażliwe na typ badanego aluminium.
Źródło:
Journal of Theoretical and Applied Mechanics; 2004, 42, 1; 95-105
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Passive vibration damping in a truss telecommunication tower
Autorzy:
Pelc, J.
Kolator, B.
Powiązania:
https://bibliotekanauki.pl/articles/297991.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
truss
tower
vibration
damping
finite element modeling
Opis:
A dynamic model of a truss telecommunication tower was developed. A viscoelastic absorber was proposed for reducing structural vibrations caused by wind. Small linear system vibrations were assumed. A finite element three-dimensional model was used to determine the damper viscoelastic parameters which guarantee the highest damping effectiveness. Simulation results indicate that a damper can reduce the amplitude of tower vibrations by half and produce a similar reduction in forces acting upon the most loaded members of the structure.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2014, 17(3); 249-258
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design, Analysis and Performance Evaluation of the Linear, Magnetorheological Damper
Autorzy:
Bajkowski, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/387045.pdf
Data publikacji:
2012
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
drgania
tłumienie
MRF
vibration
damping
magnetorheological fluid
Opis:
The paper issues the design and analysis of the linear, magnetorheological damper. Basic information concerning the characteristics of the typical magnetorheological fluid and the damper incorporating it, were presented with the short description of the applied fluid MRF-132 DG. Basing on the computations, the prototype damper T-MR SIMR 132 DG was designed, manufactured, and tested under different operating conditions. Presented calculations were verified with the experimental results and their accuracy was evaluated. The conclusions and observations from the research were compiled in the summary.
Źródło:
Acta Mechanica et Automatica; 2012, 6, 1; 5-9
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving machining performance against regenerative tool chatter through adaptive normal pressure at the tool clamping interface
Autorzy:
Fu, Q.
Rashid, A.
Nicolescu, C. M.
Powiązania:
https://bibliotekanauki.pl/articles/99845.pdf
Data publikacji:
2013
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
chatter
tool
internal turning
vibration
clamping
damping
interface
Opis:
Chatter in machining process is one of the common failures of a production line. For a cantilever tool, such as a boring bar, the rule of thumb requires the overhang length of the tool to be less than 4 times the diameter. The reason is because longer overhang will induce severe tool vibration in the form of chatter during machining. When a longer overhang than 4 times diameter is necessary for performing special machining operations, damping methods are needed to suppress tool chatter. One of the methods is the constrained layer damping method. Materials, such viscoelastic material, are applied in the vibration node regions of the structure to absorb the concentrated vibration strain energy and transform the mechanical energy to heat. With a cantilever tool clamped in a tool holder, the clamping interface is usually the vibration node region. The friction in the joint interface with low normal pressure became another source of damping and can be used for tool chatter suppression in mechanical structures. Joint interfaces are well known to possess normal pressure dependent stiffness and damping. The normal pressure's effect on the structures frequency response function had been observed by H. Akesson [1] et al, and L.Mi [2] et al. However, the direct effect of the joint interface normal pressure on machining process stability hasn't been investigated. In this paper, a cantilever tool with 6,5 overhang length to diameter ratio is investigated. The direct effect of the tool clamping interface's normal pressure on the machining process stability is studied. Three different levels of clamping normal pressure are tested with an internal turning process. The machining results indicate another adaptable solution on shop floor for suppressing tool chatter.
Źródło:
Journal of Machine Engineering; 2013, 13, 1; 93-105
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stiffness and damping characteristics of MR fluid-based sandwich beams: experimental study
Autorzy:
Romaszko, M.
Sapiński, B.
Powiązania:
https://bibliotekanauki.pl/articles/281768.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
magnetorheological fluid
beam
magnetic field
vibration
stiffness
damping
Opis:
The study investigates the behaviour of three-layered cantilever sandwich beams filled with magnetorheological fluids (MRFs) differing in the iron particle content by volume. Outer layers are made of aluminium, the space between them is sealed with silicone rubber. Two types of beams are considered: fully filled beams and partially filled beams, subjected to the magnetic field. The aim of the study is to determine stiffness and damping characteristics in relation to the magnetic field strength and the actual location where the magnetic field acts upon the beam. For this purpose, measurements have been taken of the beam free vibration response for various magnetic field strength levels and for various positions of the electromagnet located along the beam axis. Basing on the developed measurement data processing algorithm, the influence of the vibration amplitude on the natural frequency and a dimensionless damping coefficient have been determined. Finally, the equivalent natural frequency and the dimensionless damping coefficient have been derived accordingly, and the stiffness and damping ratio have been determined in function of the magnetic field strength, the electromagnet position and the MRF iron particle content by volume.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 3; 571-583
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some recent developments in inerter-based devices for vibration mitigation
Autorzy:
Wagg, David J.
Powiązania:
https://bibliotekanauki.pl/articles/27311398.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
inerter
vibration
mitigation
damping
falownik
wibracja
łagodzenie
tłumienie
Opis:
Reducing the effect of unwanted vibrations is an important topic in many engineering applications. In this paper we describe some recent developments in the area of passive vibration mitigation. This is based on a new device called the inerter which can be exploited in a range of different contexts. In this paper we consider two recent examples; (i) where a flywheel inerter is combined with a hysteretic damper, and (ii) in which a pivoted bar inerter is developed for a machining application. In both cases, experimental test results show that the devices can outperform existing methods.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 3; art. no. e144617
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studying the dynamic system “tire-suspension-body” by the resonance method
Autorzy:
Gogiashvili, Phridon
Kbilashvili, David
Chogovadze, Jumber
Lekveishvili, Gocha
Sirbiladze, Besik
Powiązania:
https://bibliotekanauki.pl/articles/2098077.pdf
Data publikacji:
2021
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
vibration
oscillation
amplitude
stiffness
damping
drgania
oscylacje
amplituda
sztywność
tłumienie
Opis:
By comparing the results of a pilot study of the damping coefficient of a pneumatic tire carried out on a test bench, this study justifies the possibility of using the less time-consuming experimental resonance curve method instead of the dynamic loop method. A mathematical model of the vertical oscillations of a vehicle’s dynamic system “pneumatic wheel-suspension-sprung weight”was created on the test-bench, and an image of the amplitude-frequency characteristic of the sprung weight oscillation was obtained. The approaches and results of the pilot and analytical studies presented in the article aid the selection of the tire with the best damping properties. The use of the experimental resonance curve method to determine the damping characteristic of a vehicle’s tire is limited in the external frequency range of the resonant frequencies. In this case, we have to use the dynamic loop method.
Źródło:
Transport Problems; 2021, 16, 1; 63--72
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis concerning changes of structure damping in welded joints diagnostics
Autorzy:
Szeleziński, A.
Muc, A.
Murawski, L.
Powiązania:
https://bibliotekanauki.pl/articles/246944.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
diagnostics
welded joints
non-destructive testing
NDT
SHM
vibration
spectrum analysis
damping decrement
Opis:
Among non-destructive testing methods of welded joints, a vibrodiagnostic method is one of the most promising in applications intended for the continuous monitoring of the structure. The accelerometer-recorded responses provide diagnostic information that requires mathematical processing to extract the essential features typical of the tested welded joints and to evaluate their execution. For this purpose, the proposed method was based on the determination of damping decrement in function of time. Due to the complexity of the responses run, a proposed method consisted of calculating the damping decrement using the response approximation with different functions. It has been shown that the changes analysis of damping decrement applied to welded plates enables the assessment of the quality associated with the weld. Attention was also paid to the elements relevant to the study. This work presents the algorithm and exemplary results obtained from the application of proposed method to several selected sample plates with different type of welds. A scientific apparatus, which purpose was to record dynamic characteristics of welded joints was also described.
Źródło:
Journal of KONES; 2017, 24, 4; 313-320
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uwzględnienie oddziaływań dynamicznych na konstrukcję trybun
Inclusion of dynamic impacts on the stand structure
Autorzy:
Drzazga, M.
Powiązania:
https://bibliotekanauki.pl/articles/162898.pdf
Data publikacji:
2013
Wydawca:
Polski Związek Inżynierów i Techników Budownictwa
Tematy:
stadion
trybuna
rozwiązanie konstrukcyjne
oddziaływanie dynamiczne
drganie
rezonans
tłumienie
stadium
stand
structural solution
dynamic impact
vibration
resonance
damping
Opis:
Artykuł ma na celu zbadanie problemu drgań konstrukcji trybun oraz zobrazowanie toku postępowania w przypadku analizy oddziaływań podczas projektowania trybun stadionów narażonych na wpływy dynamiczne generowane przez ruch tłumu.
This article is aimed at the examination of the problem of stand structure vibration, as well as the presentation of the procedure for the analysis of interactions in the course of design of the stands of stadiums, exposed to the dynamic impacts, generated by the movement of the crowd.
Źródło:
Przegląd Budowlany; 2013, R. 84, nr 12, 12; 40-45
0033-2038
Pojawia się w:
Przegląd Budowlany
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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