Wyniki wyszukiwania - BazTech

1

Rotating shaft fault prediction using convolutional neural network : a preliminary study

Kolar Davor, Lisjak Dragutin, Pająk Michał

Journal of KONES

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2019

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Vol. 26, No. 3

75--81

EN

One of the most important subsystems of the vehicles and machines operating currently in industry and transportation are the rotating subsystems. During the operation, due to the forcing factors influence, the technical state of them is changing and the failure can occur. Fault diagnosis is maintenance task considered as an essential in such subsystems, since possibility of an early detection and diagnosis of the faulty condition can save both time and money. To do this the analysis of the subsystems vibrations is performed. The identified technical state should be considered in a context of the ability and different inability states. Therefore, the first step of the diagnostic procedure is the ability and different inability states identification. Traditional data-driven techniques of fault diagnosis require signal processing for feature extraction, as they are unable to work with raw signal data, consequently leading to need for both expert knowledge and human work. The emergence of deep learning architectures in condition-based maintenance promises to ensure high performance fault diagnosis while lowering necessity for expert knowledge and human work. This article presents authors initial research in deep learning-based data-driven fault diagnosis of rotating subsystems. The proposed technique input raw three-axis accelerometer signal as high-definition image into deep learning layers, which automatically extract signal features, enabling high classification accuracy.

2

Infulence of Geometry Imperfections on Flexural-Torsional Vibrations in Rotating Systems

Łazarz B., Matyja T.

Machine Dynamics Research

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2015

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Vol. 39, No. 2

97-110

EN

In paper we investigated the influence of geometry imperfections on coupled flexural-torsional vibrations in the transient states, at start-up, in rotating systems. Consideration was given to two types of errors: the permanent deflection of a shaft in place of rotors installation (shaft bow) and inclination of a rotor plane with respect to the designed axis of rotation of the machine (angular misalignment). Used was the specialist Simulink library developed by the authors.

3

Analysis of rotating systems using actuators with magnetorheological fluid to vibrations minimization - theoretical and experimental investigation

Pręgowska A., Konowrocki R., Szolc T.

Symulacja w Badaniach i Rozwoju

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2014

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Vol. 5, nr 3

191--198

EN

The analysis of damped rotating systems using actuators with magnetorheological fluid is the subject of interest. The main purpose of this research is minimization of vibration amplitudes in order to increase fatigue durability of the most responsible machine elements. Here, control damping torques are generated by magnetorheological fluid of adjustable viscosity. The theoretical investigations are based on a hybrid and finite element structural model (FEM) of the mechanical structure as well as on sensitivity analysis of the response with respect to the actuators damping characteristics. The analysis performed in the paper combines experimental verification using the laboratory test rig with theoretical computations.

PL

Prezentowany materiał poświęcony jest analizie układów wirujących z wykorzystaniem aktuatorów z cieczą magnetoreologiczną o zmiennych właściwościach dyssypacyjnych. Głównym celem realizowanych badań jest zmniejszenie poziomu amplitudy drgań skrętnych, aby zwiększyć trwałość zmęczeniową najbardziej odpowiedzialnych elementów maszyny roboczej. W praktyce sprowadza się to do wyznaczenia optymalnej wartości współczynnika tłumienia, który jest realizowany przez film z cieczy MRF. W pracy przedstawione są wyniki analiz otrzymanych z modeli teoretycznych, poparte badaniami symulacyjnymi. Potwierdzają one rezultaty badań przeprowadzonych na zbudowanym w tym celu stanowisku eksperymentalnym. Dalsze analizy związane z tą tematyką będą dotyczyły identyfikacji defektów w układach wirujących.

4

Wykrywanie uszkodzeń w litych elementach łączących wały

Pakowski R., Trzpil M.

Zeszyty Naukowe Akademii Marynarki Wojennej

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2010

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R. 51 nr 4 (183)

117-122

PL

W artykule przedstawiono analizę wyników badań laboratoryjnych mających na celu wypracowanie algorytmu postępowania podczas wykrywania uszkodzeń w litych elementach połączeń wałów.

EN

The paper analyzes the results of laboratory tests done to develop a procedure algorithm to be followed in detecting damage in solid constructions coupling shafts.

5

Self balancing rotor design - simulation and experimental validation

Manka M., Uhl T.

Archives of Control Sciences

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2005

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Vol. 15, no. 2

233--247

EN

The paper deals with autimatic balancing of rotating systems during operation. After discussion of existing techniques the novel concepts of balancing mechanisms are presented. The proposed method are easy to apply to various rotating devices, with no need of machine construction modification. Next basics of active balancing control algorithms are presented, and designed detection and correction algorithms are discussed. After descriptions of mechanisms, measurement and control algorithms, simulation and experimental results are presented. The paper ands some conclusions about presented active balancing mechanisms and further works directions are presented.

6

An application of discrete-continuous modelling of the rotating systems for fault diagnostics

Szolc T.

Vibrations in Physical Systems

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2004

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Vol. 21

365--368

EN

In the paper coupled parametric vibration analysis of the three-bearing double span rotor-shaft system with two bladed disks has been performed by means of the analytical-numerical approach based on the discrete-continuous mechanical model. There were investigated rotor-shaft lateral vibrations coupled with its torsional-axial vibrations by the local shaft anisotropy co-operating with a bearing misalignment. For various rotational speeds a severity of the coupling effects between the mentioned kinds of vibrations was studied for several values of the bearing misalignment.

7

The New Method of Automatic Balancing during Operation

Mańka M., Felis J., Petko M., Uhl T.

Mechanika / Akademia Górniczo-Hutnicza im. St. Staszica

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2003

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T. 22, z. 3

347-354

EN

The paper deals with automatic balancing of rotating systems during operation. After discussion of existing techniques the novel concept of balancing is presented. The proposed method is very easy to apply to various rotating devices, with no need of machine construction modification. Paper contains description of mechanism, actuators, measurement and control parts of the system.

8

Thermal-diffusion effect on rotating hydromagnetic flow in porous media

Kamel M. H.

Mechanics and Mechanical Engineering

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2000

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Vol. 4, nr 2

149--164

EN

Effects of thermal-diffusion on the rotating hydromagnetic two dimensional flow of an electrically conducting incompressible viscous fluid through porous medium are analyzed. The flow considered is past an infinite non-conducting moving plate. A complete analytical solution is obtained for the temperature, the concentration and the velocity field using Laplace transformation and the method of direct integration by means of the matrix exponential (state space approach) in the case when the plate oscillates in its plane. The influence of various parameters involved is discussed with the help of illustrative graphs.