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Tytuł:
Untypical cases and incorrect results of vibration tests
Autorzy:
Wiśniewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/242412.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
vibration tests
vibration analysis
resonance tests
resonance analysis
modal analysis
Opis:
The vibration analysis is the study of the behaviour and dynamic properties of mechanical structures under actuation by harmonic vibration forces. The aim of resonance tests of the structures is the experimental delimitation of frequencies and the modes of resonance vibrations. vibration analysis, or more precisely experimental vibration analysis, is the field of measuring and analyzing the dynamic response of mechanical structures when excited by a mechanical input. The broadly applied method of research relies on the harmonic actuation of vibrations and the measurement of respective parameters. Examples would include measuring the vibration of an aircraft load bearing structure when it is attached to an electromagnetic force actuator. Current vibration testing systems are composed of actuators set with their control and powering circuits, the vibration measurement transducers (typically accelerometers), an analog-to-digital converter to digitize analog instrumentation signals) and a system host computer to analyze the data and view it. The result of researcher own accumulated experiences and those experiences knownfrom the literature create the possibility for design o f a stochastic frame model describing, what type of resonances are possible to expect in the given or other type of structure. The cases submitted below became perceived and tested in the course of research of several aircraft, glider and helicopter designs in the Resonance Tests Program of the Institute of Aviation
Źródło:
Journal of KONES; 2009, 16, 1; 591-597
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An integrated study for solving high vibration problem of a deep well turbine pump
Autorzy:
El-Gazzar, Dalia M.
Powiązania:
https://bibliotekanauki.pl/articles/2203638.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
vibration analysis
finite element analysis
modal analysis
resonance
vertical turbine pump
analiza drgań
analiza elementów skończonych
analiza modalna
rezonans
Opis:
Mechanical vibrations are a common problem encountered in many machines, especially for vertical turbine pumps. These pumps are generally difficult to stiffen or damp, but the effective diagnosis must begin with an understanding of the underlying vibratory sources. In the present work, a deep well vertical turbine pump experienced extremely high vibrations for a long time although it still being new. It hasn't been in operation for over 6 months. The pump system suffers from extremely high vibration levels relative to the rotational speed (1X motor dominant frequency). An efficient strategy was implemented by using well-conceived techniques. The experimental modal analysis confirmed a presence of a natural frequency. Modifications were carried out to overcome resonance. Finite element analysis was done to determine the reed critical frequencies as a powerful tool to identify and mitigate vibration issues. On-site motor balancing was done to remove vibrations due to the residual imbalance. Results revealed decreasing vibration level by about 66% after solving all problems.
Źródło:
Diagnostyka; 2023, 24, 2; art. no. 2023209
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite element model for analysis of characteristics of shrouded rotor blade vibrations
Model elementów skończonych do analizy charakterystyk drgań łopat wirnika osłoniętego
Autorzy:
Zinkovskii, Anatoliy
Savchenko, Kyrylo
Onyshchenko, Yevheniia
Polishchuk, Leonid
Nazerke, Abilkaiyr
Zhumazhanov, Bagashar
Powiązania:
https://bibliotekanauki.pl/articles/2174719.pdf
Data publikacji:
2022
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
FE modeling
modal analysis
forced vibration analysis
shrouded blade
nonlinear vibrations
modelowanie MES
analiza modalna
analiza drgań wymuszonych
łopata osłonięta
drgania nieliniowe
Opis:
The paper presents the approaches to FE modelling of blade airfoil, contact between the shrouds and operational damage. The regularities are established concerning the influence of the finite element type, finite element mesh and model of contact interaction on the spectrum of natural frequencies of blade assemblies. The use of the developed computational models is substantiated to determine the forced vibration characteristics of the selected objects of investigation. Based on the performed numerical experiments it was substantiated of finite element model selection for analysis of characteristics of shrouded rotor blade vibrations.
W artykule przedstawiono podejścia do modelowania elementów skończonych płata łopaty, styku osłon oraz uszkodzeń eksploatacyjnych. Ustalono prawidłowości dotyczące wpływu typu elementu skończonego, siatki elementów skończonych oraz modelu interakcji stykowej na widmo częstotliwości drgań własnych zespołów łopatek. Uzasadnione jest wykorzystanie opracowanych modeli obliczeniowych do wyznaczania charakterystyk drgań wymuszonych wybranych obiektów badań. Na podstawie przeprowadzonych eksperymentów numerycznych uzasadniono wybór modelu elementów skończonych do analizy charakterystyk drgań osłoniętych łopat wirnika.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2022, 12, 4; 11--16
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of the dynamic properties of structures the models of interpretation
Autorzy:
Wiśniowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/243504.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
aviation
vibration
structure testing
resonance analysis
modal analysis
Opis:
Experimental research of the dynamic properties of structures is performed during of prototype perfectioning, current exploitation and even after the withdrawal from the exploitation for the estimation of the residual durabilities. The aim for research of the dynamic properties of structures is the assurance of its safety, reliability, economic management and comfort. Researcher records the amplitudes of vibrations in the function of the actuation frequencies. Local raise of the amplitude is qualified as resonance. From the researcher point of view, the shape of resonance curves justifies the discrimination of two types of phenomena's: „single resonance" and „close frequencies resonance". For better understanding of these occurrences „the models of interpretation" were proposed. Up to three models of interpretation were assigned to the single resonance: one-degree-of-freedom system, one-degree-of-freedom system with share of the backlashes, two one-degree-of-freedom systems with the same frequencies. From above reasoning, the conclusion results that researcher can expect that the preliminary isolated single resonance belongs to one from the three, mentioned above cases. The judgment of these occurrences, just as the disentanglement of relations in the resonance pair with close frequencies, determines next challenge for the researcher.
Źródło:
Journal of KONES; 2008, 15, 3; 561-565
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of the vibration method in testing steel load-bearing cables for the purpose of developing a method of measuring their state of tension
Autorzy:
Bartmański, C.
Bramorska, A.
Powiązania:
https://bibliotekanauki.pl/articles/114407.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
technical diagnostics
vibration
cables stress
modal analysis
Opis:
In technical diagnostics of load-bearing tendons of bridge and building structures, vibration methods are popular due to simplicity, speed of results and low costs of their application. The aim of the research was to develop a method for measuring the load-bearing cables stress. The article presents the results of tests on the cable testing stand, which enable identification of the parameters of the cable dynamic model. In the research, a technique was applied consisting in impulse stimulation to vibrations of the tense steel cable and analysis of signals, which are a response of the cable to this excitation. Using the modal analysis method, the dependence of the frequency of various forms of the cable natural vibrations on the cable tensioning force was determined. Three types of cables were tested. The bending rigidity of the cable was determined. Using the modal analysis method as a reference method, the usefulness of a simpler method of evaluating cable natural frequency, was examined.
Źródło:
Measurement Automation Monitoring; 2017, 63, 8; 258-262
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Innovationality is the transfer process from the idea to commercialization
Autorzy:
Wiśniewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/243893.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ground vibration test
modal analysis
aircraft structure dynamics
Opis:
In today's world, innovationality is synonymous with modernity, development, good governance and strategic thinking. The country 's economy and whole of society should be innovative. The research and development process and the results of the work would be reviewed from the commercialization perspective. The all innovative projects should finish on thefree market, but majority of them end their lives at the research and development stage. The idea of spin-off corporations has to serve the subordination of the entire innovative project realization cycle to the vision of its commercialization. Innovative society and economy require implementation of both large and small innovations, created in large, medium and small R & D programs. In economically leading countries, the mega-programs play an important role in innovationality. small innovation programs are usually created by small research teams and individual inventors. For the balanced development of the country's economy, there is a needfor the variety, both small and large innovation programs. In the absence of an effective opportunity to realize one's own Polish mega-programs, it is worth to consider the mega-program named: ,,Provision of services on the International research market" as a Polish specialty. For 10 years the Warsaw's Institute of Aviation pursues this strategy. The Institute of Aviation employs about 800 specialists, which perform the advanced research of the new materials and designs for the new gas turbine engines and combustion systems.
Źródło:
Journal of KONES; 2010, 17, 1; 485-488
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the Geometric Properties of a Jet Engine Fan Blades Based on Modal Vibration Testing
Autorzy:
Osiewicz, Maciej
Cieślak, Sławomir
Bielecki, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/36778970.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
blade vibration
modal analysis
finite elements
design
aviation
Opis:
The article presents an experimental method of determining the geometric properties of jet engine rotor airfoils based on modal vibration testing. The procedure is based on adjusting the results of analytical calculations to the laboratory outcomes. Experimental tests were carried out on a set of 20 jet engine fan blades made of AL7022-T6 aluminium alloy. Each blade differed in weight and geometric dimensions within the accepted design tolerance. Numerical analysis of five airfoils that differed in thickness was performed. Modal vibration test results were summarised and compared with the results obtained by the numerical method. The comparison revealed a high similarity of the frequency and form of vibrations acquired by numerical simulation for each of the blades in relation to the executed vibration testing. Based on the verification of the theoretical model with the results obtained through experimental testing, conclusions were drawn about the object’s dynamic behaviour and its technological quality and geometric properties, whereby each of airfoil was probably thinned.
Źródło:
Transactions on Aerospace Research; 2022, 3 (268); 56-74
0509-6669
2545-2835
Pojawia się w:
Transactions on Aerospace Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Main elements of investigation of measures of vibration energy propagation in structures
Elementy główne badania miar rozpływu energii drgań w konstrukcjach
Autorzy:
Jeleniewicz, K.
Zółtowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2084027.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
modal analysis
natural vibrations
modeling of vibration processes
Opis:
The paper indicates the possible range of applications of investigation of measures of vibration energy propagation, used in modeling of vibration processes and methods of modal analysis in the area of research methodology and detailed methodologies of technical sciences. Theoretical analyzes and practical verification of results of testing of many different materials and structures indicate a wide range of applications of the described achievements. Recognizing the need to improve methods of testing of building structures in order to assess their degradation state, this work presents generalized, significant results of a research procedure within the scope of verification of the effectiveness of the developed methodologies for detailed application of vibration measures in simulation, bench and operation tests.
Źródło:
Acta Scientiarum Polonorum. Architectura; 2021, 20, 1; 77-86
1644-0633
Pojawia się w:
Acta Scientiarum Polonorum. Architectura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of changes in some design parameters on the dynamic properties of aircraft
Autorzy:
Wiśniewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/243891.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ground vibration test
modal analysis
aircraft structure dynamics
Opis:
The aim of the study presented in the paper was to examine the impact of changes related to aircraft modernization, the dynamic properties of an aircraft on the basis of five cases studied experimentally. Which changes in the dynamics of an aircraft structure occurred as a result of modernization can be experimentally tested by resonance tests. For this purpose, resonance tests should be carried out before the aircraft modernization and after its completion. In order to mapping the conditions of free flight the objects were suspended flexibly. The electrodynamics actuators were used to induce vibrations, piezoelectric transducers were used for the measurement of vibrations. The size and phase of extortion forces and their application points were selected individually for each resonance in order to get the best separation of it. The first stage of the study was based on recordings the frequency - amplitude characteristics. The second stage of the study was the Identification of individual frequencies and mode shapes of each resonance, which was implemented by choosing the size and the proportion of mutual phase shifts between the extortion forces. In the selection the criteria based on minimizing the phase difference of vibrations measured at several points of the structure were used. The final stage of this study was to register the frequency and shapes mode of the tested resonance and the resonance generalized masses and damping coefficients.
Źródło:
Journal of KONES; 2010, 17, 1; 479-483
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical and experimental vibration analysis of telescopic platforms
Autorzy:
Yucel, A.
Arpaci, A.
Powiązania:
https://bibliotekanauki.pl/articles/949115.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
telescopic platforms
modal analysis
finite element method
vibration
Opis:
In this study, vibration analysis of a telescopic platform is conducted, and the platform structure is reconstructed to satisfy vibrational standards. The analysis is realised using solid modelling, finite elements and an analytical method. The results are verified using experimental modal techniques. Through the finite element and experimental modal approach free vibration analysis is carried out and natural frequencies are determined. Additionally, vibration accelerations of the structure are obtained by forced vibration analysis of the model. All calculations one performed on the new reconstructed structure, and it is determined whether the reconstructed structure satisfies the vibrational standards.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 1; 41-52
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of harbour brick structures by using operational modal analysis
Autorzy:
Żółtowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/258750.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
modal analysis
natural vibration frequency
stabilization diagram
structural vibrations
Opis:
Historic harbour brick objects are subject to large dynamic loads clearly reflected by generated vibration processes. The vibrations may affect state of serviceability of structures by lowering comfort of persons working there as well as possible reaching the level hazardous to safety of the structures. The effect of vibrations to structure is mainly manifested by additional stresses in a given cross-section, which are summed up with those resulting from static loads. Moreover often occur consequences associated with environmental conditions and fatigue of materials which accelerate destruction of the objects. Therefore the dynamic loads may cause damaging effects in buildings of various structural types or even lead to their catastrofic destruction. Judging the necessity of improving the quality assessment methods of building structures for purposes of estimation of their state as well as safety factors for brick structures (see PN-B- 03002 standard, p.3.1.3 and 4.6), the author of this work undertook an attempt to investigate destruction process of selected building structures by using the method of operational modal analysis.
Źródło:
Polish Maritime Research; 2014, 1; 42-53
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody badania form odkształceń stojana maszyn elektrycznych
Measurement Methods of Electric Machines` Stator Vibrational Shapes
Autorzy:
Karkosiński, D.
Powiązania:
https://bibliotekanauki.pl/articles/151964.pdf
Data publikacji:
2003
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
silnik indukcyjny
drgania
badania modalne
induction motor
vibration
modal analysis
Opis:
Omówiono podstawy, cechy i zalecenia wykonania klasycznej analizy modalnej, eksploatacyjnej analizy modalnej i najnowszej analizy eksploatacyjnych form odkształceń (ODS FRF) w zastosowaniu do maszyn elektrycznych. Do analizy eksploatacyjnych form odkształceń sformułowano oryginalny wzór działania na widmach oraz wprowadzono dekompozycję kształtu formy odkształceń. Na podstawie przykładowych badań silnika indukcyjnego małej mocy wykazano różnice pomiędzy modalnymi formami odkształceń stojana a powstającymi podczas pracy silnika.
The natural mode shapes of motor`s stator associated with structural resonances can differ significantly from vibration responses of a stator structure excited by series of rotaring radial magnetic force waves. Basics and recommendations concerning modal analysis and operating deflection shapes (ODS FRS) measurements of low-power induction motors are discussed. The modal analysis has been used in order to obtain ststor mode shapes. For acquiring operating deflection shapes from the stator structure under steady state operation the formula of spectrum rule has been prepared and the ODS FRF analysis has been applied. Circumferential stator operating deflection shapes have been compared with mode shapes - Fig. 2,3. The test results allowed to conclude that forces with frequencies significantly different from free vibration frequencies of a structure force circumferential vibration shapes with dominant component and additionally higher or lower mode number. On the other hand near the resonant frequencies ODSs have dominant but not "pure" component.
Źródło:
Pomiary Automatyka Kontrola; 2003, R. 49, nr 12, 12; 54-57
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eigencharacteristics of fluid filled tanks: an extended symmetrical coupled approach
Autorzy:
Wiśniewski, A.
Kucharski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1933192.pdf
Data publikacji:
2006
Wydawca:
Politechnika Gdańska
Tematy:
fluid-structure interaction
modal analysis
free vibration
acoustic method
FEM
Opis:
In the numerical analysis of the eigen behaviour of large liquid and gas storage tanks, an important role is played by initial pre-stressing of such thin-walled structures due to high fluid pressure and gravity. In a majority of numerical simulations, the finite state of deformation is first calculated, following which small, linear vibrations are superimposed on the finite state. This paper is devoted to refinement and assessment of the basic Eckart superimposed eigencharacteristics problem simultaneously stated in fluid and thin-walled structures. Eckart's coupled approach leads to variational structure-fluid coupling in the so-called acoustic approximation. In order to verify the feasibility and correctness of the symmetrical Eckart approach, finite element discretization and a calculation example of a rectangular tank are presented. The calculated results are compared with literature ones.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 4; 455-468
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Side Effect of the Use of Acoustic Barriers Observed in the Infra Range
Autorzy:
Staniek, Andrzej
Bartmański, Cezary
Powiązania:
https://bibliotekanauki.pl/articles/176858.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
modal analysis
infra range noise
vibration
acoustic barrier
road traffic
Opis:
Acoustic barriers which are positioned along traffic lanes are designed to protect the surroundings from excessive noise. Such structures are to reverberate, diffract and damp the propagating acoustic waves. However, this method of shielding has some disadvantages which include constraint visibility and structure-born noise. The interaction between traffic-caused movement of air mass and acoustic barriers may generate infra noise waves. That is undesirable and should be estimated. The authors undertook the research to diagnose the plausible side effect of structure-born noise of such barriers because it may influence human body (Kasprzak, 2014). As a mechanical structure, the acoustic barrier is characterized by mechanical parameters which, in the field of modal analysis, are made up of natural frequencies, damping factors and mode shapes. In this paper the authors investigated the acoustic pressure distribution in the neighborhood of a real acoustic barrier in the scope of infra noise propagation. The methods of modal analysis were used to identify natural frequencies of the barrier and dominating frequencies of propagating waves in the far field. The correlation between observed vibration and acoustic signals is presented.
Źródło:
Archives of Acoustics; 2020, 45, 1; 103-110
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelowanie i symulacja procesu nadzorowania drgań w układzie hybrydowym na przykładzie frezowania przedmiotów podatnych
Modelling and simulation of vibration surveillance of the hybrid systems on example of milling flexible details
Autorzy:
Kaliński, K.
Chodnicki, M.
Sawiak, S.
Galewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/329014.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
obrabiarki
drgania przedmiotu
układy hybrydowe
nadzorowanie drgań
analiza modalna
machine tools
workpiece vibration
hybrid systems
vibration surveillance
modal analysis
Opis:
Praca dotyczy nadzorowania drgań niestacjonarnych układów mechanicznych za pomocą sterowania optymalnego przy energetycznym wskaźniku jakości. W układzie drgającym wyodrębniono podukład modalny, podukład strukturalny oraz podukład łączący. Dynamikę układu sterowanego opisano we współrzędnych hybrydowych. Przedstawiono przykład nadzorowania drgań podczas skrawania przedmiotów podatnych frezem kulistym.
The paper concerns vibration surveillance of non-stationary mechanical systems by the optimal control at energy performance index. There are separated from vibrating system following subsystems: modal, structural and connective. Dynamics of controlled system is described in hybrid co-ordinates. Here is explained vibration surveillance during ball end milling of flexible details and considering assurance of parameters of a modal subsystem.
Źródło:
Diagnostyka; 2005, 33; 83-88
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
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