Temat: propeller vibration

Skocz do pozycji: 1.

Tytuł:: The influence of structural features on vibration of the propeller engine test bench
Autorzy:: Ostapski, W.
Aromiński, A.
Tułodziecki, M.
Tematy:: propeller engine test bench
propeller vibration
digital modelling
CAD
construction; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/280586.pdf Link otwiera się w nowym oknie
Opis:: The paper concerns the prototype of a propeller engine test bench stand designed for durability tests of airplane piston engines of 150-250 kW power range (Ostapski, 2011b, 2008). The technical data of the prototype engines to be tested on the bench have been adopted. It is obvious that at the beginning of the design process there is no information about the vibration spectrum of the propeller shaft, which is at the production process at that time. The basic 3D model of test bench constructional variants are presented in the article. Modes and frequencies of free vibrations are defined in ANSYS environment for both the loaded and unloaded structure and for various design variants. The estimated vibration frequency range for the propeller shaft varies from ƒ = 22 to ƒ = 360 Hz. In such a case, there is no easy way for rational test bench construction to be completely “untuned” to the vibration forcing load. This is the reason for introducing the basic model and few its modifications. After first engine tests, it should be possible to separate natural vibrations of the bench and high amplitude vibrations of the engine.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Fluid–structure interaction vibration experiments and numerical verification of a real marine propeller
Autorzy:: Lou, Benqiang
Cui, Hongyu
Tematy:: fluid–structure interaction
real propeller vibration experiments
direct coupling
finite element method
added mass ratios; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/1955613.pdf Link otwiera się w nowym oknie
Opis:: The design of lifting blade shapes is a key engineering application, especially in domains such as those of marine propellers, hydrofoils, and tidal energy converters. In particular, the excitation frequency must be different from that of the structure to avoid resonance. The natural frequency in the cases where the fluid–structure interaction (FSI) is considerably different if considering the coupling added mass (AM) of the water. In this study, vibration experiments were performed using a real propeller in air and water. The modal parameters, natural frequencies, and mode shapes were determined. Validations were performed using 3D solid and acoustic elements in a direct coupling finite element format. The modal results and AM ratios were in agreement with the experimental results. Convenient application and high efficiency are basic requirements for an engineering application. Therefore, an empirical formula was established for the first-order FSI natural frequency to enable rapid estimation, thereby satisfying this requirement.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A method to assess transverse vibration energy of ship propeller shaft for diagnostic purposes
Autorzy:: Korczewski, Z.
Tematy:: rotational mechanical system
propeller shaft transverse vibration energy
calculation model; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259221.pdf Link otwiera się w nowym oknie
Opis:: The article discusses a key problem of ship propulsion system vibration diagnostics, which concerns assessing this part of mechanical energy transmitted from the main engine to the ship propeller which is dissipated due to propeller shaft vibration. A simplified calculation model is proposed which allows the total energy of the generated torsional vibration to be assessed from the shaft deflection amplitude measured at the mind-span point between the supports. To verify the developed model, pilot tests were performed on the laboratory rotational mechanical system test rig. In those tests, cyclic bending moment was applied to a unified (cylindrical) material sample, which modelled, at an appropriate scale, structural and functional properties of a real propeller shaft.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Blade cup method for cavitation reduction in marine propellers
Autorzy:: Samsul, M. Burak
Tematy:: marine propeller
computational fluid dynamics
propeller cup
cupping
cavitation
propeller efficiency
vibration
noise
erosion; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/1573632.pdf Link otwiera się w nowym oknie
Opis:: Energy efficiency has become more important in every industry and daily life. Designing and building a more efficient marine vehicle can lead to lower fuel consumption and a longer lifetime for the components of the vehicle. Erosion caused by cavitation reduces the service life of the propeller and the related components in the propulsion and maneuvering system. Reducing cavitation leads to a longer life for these components. This paper aims to explain and investigate propeller blade cup as a cavitation reduction method for marine propellers. A cavitating no-cup propeller is created and analyzed then the cupped version of this propeller is generated and analyzed to compare with the no-cup propeller. Cavitation results of these propellers are investigated. In addition, the thrust, torque, and efficiency of the propellers are compared.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Spin test : the ability of spin test method usage in thrusters fault detection and isolation
Autorzy:: Iwanicki, L.
Kyzioł, L.
Kozyra, D.
Tarsa, R.
Tematy:: spin test
thrusters' propeller
vibration
ability
speed; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/245943.pdf Link otwiera się w nowym oknie
Opis:: In the article below, we presented the possibility of „spin test“ method usage for medium rotational speed devices such as thrusters', which are used to enhance the maneuverability of maritime vessels. The reason for the analysis is the problem of eliminating the unwanted vibrations of thruster's propeller with commonly used methods. It is an innovative solution for accurate verification of the technical condition of screw propellers, which are the most common devices used as the propelling element of thrusters. In the introduction the possibility of thruster's diagnosis using „spin test“ has been described. Commonly used thrusters' and their working conditions were presented. In order to properly assess the technical condition of rotational speed devices, such as thrusters' propellers after their production or renovation it is vital to provide an additional diagnosis in the environment similar to working conditions. Secondly, the problem of spinning parts' vibration was described. „Spin test“ method presented here gives the ability of detailed analysis of spinning parts' vibration. The idea of a compact and easy to assemble station enabling to conduct such research has been shown. The station not only allows to measure the eigenfrequency of vanes' in normal mode and compare it with the previously calculated ones, but also enables material's endurance testing at speeds higher than nominal speed. Finally, we presented the range of using this method in different fields along with the benefits of ‘Spin Tests’.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Vibration equations of the coupled torsional, longitudinal, and lateral vibrations of the propeller shaft at the ship stern
Autorzy:: Firouzi, Jabbar
Ghassemi, Hassan
Vakilabadi, Karim Akbari
Tematy:: vibration equations
coupled vibration
shaft and propeller
added mass
ship stern
hydrodynamic coefficients; Pokaż więcej
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Powiązania:: https://bibliotekanauki.pl/articles/135360.pdf Link otwiera się w nowym oknie
Opis:: A propeller shaft generally experiences three linear forces and three moments, the most important of which are thrust, torque, and lateral forces (horizontal and vertical). Thus, we consider 4DOFs (degrees of freedom) of propeller shaft vibrations. This paper is presented to obtain the vibration equations of the various coupled vibrations of the propeller shaft at the stern of a ship (including coupled torsional-axial, torsional-lateral, axial-lateral, torsional-axial, and lateral vibrations). We focused on the added hydrodynamic forces (added mass and added damping forces) due to the location of the propeller behind the ship. In this regard, the 4DOFs of the coupled vibration (torsional-longitudinal and lateral vibrations in the horizontal and vertical directions) equations of shaft and propeller systems located behind a ship were extracted with and without added mass and damping forces. Also, the effect of mass eccentricity was considered on vibrations occurring at the rear of the ship.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Comparative analysis of the calculation methods of the marine propeller’s blade thickness
Autorzy:: Murawski, L.
Tematy:: marine propeller
strength
vibration
solid structure in fluid
FEM modelling methodology; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/244269.pdf Link otwiera się w nowym oknie
Opis:: Strength of the propellers with the skewback greater than 25º has to be numerically analysed according to marine classification societies. The finite element method (FEM) is advised for that kind of calculations. Classical and typical propellers (skewback < 25º) may be designed on the base of empirical equations given by the societies. The minimal thickness of the propeller blade is determined by the equations. Each classification society has their own empirical formula. Sometimes, well-designed propeller for one society has not enough strength according to the other society. What is more, propellers designed according to the empirical formulas might be not optimal. Comparative analysis of the marine propeller’s blade strength has been described in the article. Calculations of the propeller’s blade thickness have been done by two international classification societies’ empirical formulas (ABS and DNV). The results have been compared with Finite Element Method calculations (NASTRAN program). The methodology of propeller static strength vibration analyses is presented. Numerical calculation methodology is based on solidstate mechanics with loadings determined by fluid mechanics calculations. Steady state and transient fluid flow of the propeller’s working conditions were taken into account. In order to determine the optimal modelling method of the propeller several different numerical models were compared, including free model of whole propeller and single blade with boundary conditions placed in the foot. The propeller optimization was the main target of the analyses. Propeller blade thickness might be reduced after FEM method analysis - the propeller mass saving can be achieved.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Forces exciting vibrations of ships hull and superstructure
Autorzy:: Murawski, L.
Tematy:: hull vibration
superstructure vibration
main engine vibrations
excitation forces
pressure pulses
propulsion system's reactions
crankshaft-propeller phasing; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259533.pdf Link otwiera się w nowym oknie
Opis:: The paper presents identification of main excitation forces ofvibrations of ship hull and its superstructure, as well as investigation of influence of the analyzed excitation on ship vibration level. The following excitation forces were analyzed: dynamic pressure on the transom deck, propeller-generated hydrodynamic forces, as well as internal and external engine-generated forces. Rigidity and attenuation characteristics of lubricating oil film were taken into account in the analysis of the excitations transmitted by the propulsion system bearings (stern tube bearing, intermediate bearing, engine s main and thrust bearings). The dynamic characteristics of ship's power transmission system were also taken into account.Results of the analyzes were verified by comparing results of the computations and measurements.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Investigation of influence of aircraft propeller modal parameters on small airplane performance
Badania wpływu modalnych parametrów śmigła na zachowanie małego samolotu
Autorzy:: Kilikevičius, Arturas
Rimša, Vytautas
Rucki, Mirosław
Tematy:: aircraft propeller
dynamics
vibration
operational modal analysis
śmigło lotnicze
dynamika
wibracje
analiza modalna; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Powiązania:: https://bibliotekanauki.pl/articles/301179.pdf Link otwiera się w nowym oknie
Opis:: The aim of the current paper is to investigate a small airplane model propeller of class F2D according to requirements of Fédération Aéronautique Internationale (FAI, or World Air Sports Federation). In some cases, practical tests show that F2D models with flexible propellers produce specific extra noise and increase flight speed in comparison with “rigid” propellers. Therefore, the following hypothesis could be proposed: flexible characteristics of the increased noise are related to the resonant eigenfrequencies of the propeller. The operating range of the F2D class propeller (28,000-35,000 rpm) is close to or equal to the eigenfrequency resonance. The current investigation addresses dynamic/flexible vibrations of elastic propeller during engine run and researches dynamic parameters of the propeller as well as the contribution of these parameters to the model flight characteristics. To resolve this type of a problem, a stand, which allows completing a physical investigation of flexible propeller vibration modes and dynamic characteristics was created.
Celem artykułu jest przedstawienie wyników badań śmigła małego modelu samolotu zaliczanego do klasy F2D (według klasyfikacji Fédération Aéronautique Internationale, FAI). W niektórych przypadkach testy wykazały, że modele F2 z giętkimi śmigłami, w porównaniu do śmigieł sztywnych, wydają dodatkowy hałas i zwiększają prędkość samolotu. Dlatego wysunięto hipotezę, że elastyczne charakterystyki zwiększonego hałasu są powiązane z rezonansem częstotliwości własnych śmigła. Zakres pracy śmigła klasy F2D (28 000-35 000 obr/min) jest zbliżony do jego częstotliwości własnych. Badania dotyczą elastycznych wibracji dynamicznych śmigła giętkiego w czasie rozruchu silnika i są nakierowane na wyznaczanie parametrów dynamicznych i ich wpływu na charakterystyki lotu modelu. Wykonano i opisano stanowisko, na którym przeprowadzono testy modalne drgań giętkiego śmigła. Na tej podstawie uzyskano charakterystyki dynamiczne.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Issledovanie vliania grebnyh vintov na vibraciu sudov tipa SRTM
A Study of the Influence of Screw Propeller on Vibrations of a SRTM Type Ship
Autorzy:: Datczenko, S.
Zagackij, W.
Puchow, W.
Tematy:: EXPLO-SHIP 2004
ship hull
screw propeller
deflections of parameters of screw propellers from the designed ones
vibration of the ship hull; Pokaż więcej
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Powiązania:: https://bibliotekanauki.pl/articles/359875.pdf Link otwiera się w nowym oknie
Opis:: This case study, involving a ship of the STRM type, has shown that increased vibrations in crew accommodations to a large extent depend on stresses exerted by the screw propeller. It has been found that the frequency of propeller blades and its second harmonic have the largest effect on ship hull. The amplitudes of the first and fourth order stresses were calculated.
Dostawca treści:: Biblioteka Nauki

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