Bibliografie tematiche / MULTI CRACKED ROTOR

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Letteratura scientifica selezionata sul tema "MULTI CRACKED ROTOR"

Autore: Grafiati

Pubblicato: 11 settembre 2023

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Articoli di riviste sul tema "MULTI CRACKED ROTOR"

Parhi, Dayal R., e Adik R. Yadao. "Analysis of dynamic behavior of multi-cracked cantilever rotor in viscous medium". Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 230, n. 4 (3 agosto 2016): 416–25. http://dx.doi.org/10.1177/1464419315618033.

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Abstract (sommario):

The present investigation is an attempt to evaluate the dynamic behaviours of multi-cracked cantilever rotor shaft with an additional mass attached at the tip of the shaft, which is partially submerged in the viscous fluid. In this work, theoretical expressions are developed to find the fundamental natural frequency and amplitude of the multi-cracked rotor shaft with attached mass, using influence coefficient method. Navier–Stoke’s equations are used for the analysis of external fluid forces acting on the rotor. Viscosities of the fluid and relative crack locations are taken as main variable parameters. For the analysis, suitable theoretical expressions are considered, and the Matlab programming is made to obtain the results. Experimental verifications are also performed to prove the validity of the theory developed.

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Zheng, Zhaoli, Yonghui Xie, Di Zhang e Fahui Zhu. "Numerical investigation on the nonlinear dynamics of a breathing cracked rotor supported by flexible bearings". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, n. 19-20 (31 luglio 2019): 6815–26. http://dx.doi.org/10.1177/0954406219866473.

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The steady-state response and breathing mechanism of a cracked rotor supported by flexible bearings are investigated in this paper. The generalized and efficient method proposed in this paper can be used to study the dynamics of complicated cracked structures without much modification. First, a three-dimensional finite element model of the cracked rotor-bearing system is established in the rotating frame and a general contact model for modeling the breathing crack is proposed. A component mode synthesis is used to form a reduced-order model. Then, a procedure combining multi-harmonic balance method with arc-length method is used to search the response solution. To accelerate the calculation, the analytical formulations for calculating the tangent stiffness matrix are used. Finally, the gravity induced response and breathing mechanism of a cracked rotor-bearing system are obtained. Interesting result is that the rotational speed and the crack depth will influence the breathing mechanism even if the load remains unchanged.

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Yu, Tao, Ying Yang, Qing Kai Han, Hong Liang Yao e Bang Chun Wen. "ANN-Based Crack Identification in Rotor System with Multi-Crack in Shaft". Key Engineering Materials 353-358 (settembre 2007): 2463–66. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.2463.

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Abstract (sommario):

Rotating machinery, such as steam turbo, compressor, and aeroengine etc., are widely used in many industrial fields. Among the important rotor faults, the fatigue crack fault, which can lead to catastrophic failure and cause injuries and severe damage to machinery if undetected in its early stages, is most difficult to detect efficiently with traditional methods. In the paper, based on the truth of the change of the mode shapes of the cracked structure, a new method by combining accurate finite element model of rotor with multi-crack in shaft and artificial neural network (ANN) is proposed to identify the location and depth of cracks in rotating machinery. First, based on fracture mechanics and the energy principle of Paris, the accurate FE model of the rotor system considering several localized on-edge non-propagating open cracks with different depth, is built to produce the specific mode shapes. Then a set of different mode shapes of a rotor system with localized cracks in several different positions and depths, which will be treated as the input of the designed ANN model, can be obtained by repeating the above step. At last, with several selected crack cases, the errors between the results obtained by using the trained ANN model and FEM ones are compared and illustrated. Meanwhile, the influences of crack in the different position on the identification success are analyzed. The method is validated on the test-rig and proved to have good effectiveness in identification process.

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Dau, Anh Tuan, Ionel Nistor e Adinel Gavrus. "Numerical Analysis Concerning the Harmfulness of Crack Turbine Rotors Using a Multi-Scale Approach Based on a Dynamic Finite Element Method". Applied Mechanics and Materials 656 (ottobre 2014): 315–24. http://dx.doi.org/10.4028/www.scientific.net/amm.656.315.

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This work is placed in the context of the simulation of the behavior and the harmfulness of cracked rotors by Electricité de France (EDF) in order to evaluate its impact on the industrial system. Several numerical tools have been developed by the Research and Development Division of EDF and a feasibility study was conducted to prove its capacities to simulate the behavior of a rotor subject to a crack. Since the industrial context request fast response to such situation, the numerical simulation must be performed as quickly as possible. For this reason a multi-scale 1D-3D modeling has been proposed: the healthy part of the rotor is modeled by reduced Timoshenko beam finite elements since the part including the crack is modeled by 3D finite elements. The aim of the work is to prove the accuracy of this multi-scale approach, its feasibility and its CPU performance.

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Kulesza, Zbigniew. "Harmonic Balance Analysis for the Rigid Finite Element Model of the Rotating Cracked Shaft". Solid State Phenomena 199 (marzo 2013): 99–104. http://dx.doi.org/10.4028/www.scientific.net/ssp.199.99.

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The paper presents a multi-dimensional harmonic balance analysis utilized to study the vibration responses of the cracked rotor subject to gravity, unbalance and an additional lateral harmonic force generated by an active magnetic bearing. The nonlinear terms resulting from the shaft crack are included via an alternating frequency/time domain (AFT) method. The example addressed in this paper is a simple rotor modeled by using the rigid finite element (RFE) approach. Combination frequencies are recognized as evident symptoms of the shaft crack.

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Li, Xue Jun, K. Wang, Ling Li Jiang e T. Zhang. "Rotor Crack Detection Based on Multi-Vibration Signal Fusion Collected from the Basement of Machinery Using SVM and Statistical Characteristics Methodology". Applied Mechanics and Materials 34-35 (ottobre 2010): 1000–1004. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.1000.

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As the poor generability of special sensor support frame and the inconvenience of signal acquisition in the process of common fault diagnosis for cracked rotor, a new fault diagnosis method is presented in this paper. this method takes the basement of rotor test rig as the monitoring objects and makes feature fusion for time-domain statistics of multiple sensors using SVM (support vector machine). The result of experiment showed that the method using the multi-sensor signal fusion technology collected from the basement of machinery has the advantages of better diagnostic precision for rotor crack diagnosis, furthermore, it supplies a new way for rotor fault diagnosis.

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Banaszek, Slawomir. "Dynamics of Large Power Rotating Machine with Cracked Shaft". Key Engineering Materials 293-294 (settembre 2005): 337–46. http://dx.doi.org/10.4028/www.scientific.net/kem.293-294.337.

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The paper presents the course and results of crack propagation simulation research. The object taken into account is a large power turbo-set rotor. The computer code system NLDW is presented. It uses a non-linear model of journal bearings, and well known crack model. Crack depth is marked by a crack coefficient. It is shown the crack generates a coupled forms of lateral, axial and torsional vibrations in multi-support rotor. Their intensity depends on the axial and circumferential crack location on the shaft. The attempt at pointing a proper diagnostic indicator for crack detection in large rotating machine is made according to obtained results.

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Jadhav, P. V., R. A. Barawade, S. V. Patil, Y. B. Mohite e V. R. Patil. "An Experimental and Numerical Investigation on Static Vibration Response of Multi-Cracked Rotor Shaft". IOP Conference Series: Materials Science and Engineering 377 (giugno 2018): 012041. http://dx.doi.org/10.1088/1757-899x/377/1/012041.

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El-Mongy, Heba H., e Younes K. Younes. "Vibration analysis of a multi-fault transient rotor passing through sub-critical resonances". Journal of Vibration and Control 24, n. 14 (7 marzo 2017): 2986–3009. http://dx.doi.org/10.1177/1077546317697828.

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Abstract (sommario):

Various faults may simultaneously occur in a rotor dynamic system. It is crucial to detect and monitor these faults to ensure the safe operation of machinery. Usually, vibration response is utilized for fault diagnosis; however, the identification process becomes more challenging when multiple faults exhibit similar symptoms in the vibration response. In this paper, the vibrational transient response of a cracked rotor is analyzed in the presence of unbalance and coupling misalignment. The study focuses on investigating the possibility, advantages and limitations of using the sub-critical startup response in solving the fault identification problem. Numerical simulations using finite element modeling and experimental investigations are carried out for different individual and multi-fault conditions. Various factors are taken into consideration, including sub-critical limit speed, crack parameters, unbalance parameters and misalignment severity. Numerical and experimental investigations showed that the sub-critical transient response is suitable for the fault detection and diagnosis of the simultaneously existing faults studied. Compared to the critical response, the sub-critical response is more informative and each fault shows a unique feature that can be extracted without the need for sophisticated post signal processing. The study provides useful insights on the interaction between the various fault effects on the vibratory response and presents a simple method for condition monitoring of industrial equipment.

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Xiong, Libo, Chunrong Hua, Funing Yang, Dawei Dong e Huajiang Ouyang. "Dynamic Characteristics Analysis of a Coupled Multi-crack Rotor System". Journal of Physics: Conference Series 2184, n. 1 (1 marzo 2022): 012040. http://dx.doi.org/10.1088/1742-6596/2184/1/012040.

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Abstract This paper establishes a coupled model for multi-crack rotor using Timoshenko beam element with six degrees of freedom, and derives the stiffness matrix in the equations of motion accounting for the coupling between multiple cracks (the interaction between cracks). Then the effects of crack orientation angles (the relative angle between cracks, γ) on dynamic characteristics of the coupled multi- crack rotor near 1/3 and 1/2 subcritical speeds are analysed. The coupling between cracks induces more complex nonlinear dynamic characteristics such as large magnitudes of the super-harmonic components, which can be used as the indicators of early crack and for multi-crack identification. This work has a promotive significance for the application of the model-based method in the field of multi-crack detection of actual rotors.

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Più fonti

Tesi sul tema "MULTI CRACKED ROTOR"

JAIN, ANUJ KUMAR. "DYNAMIC ANALYSIS OF MULTI CRACKED ROTOR THROUGH EXTENDED LAGRANGIAN MECHANICS". Thesis, 2018. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16490.

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Abstract (sommario):

The initiation of fatigue cracks or other defects in structures or machines or their elements cause a reduction in stiffness and also change the dynamic characteristics of the machine. Dynamic analysis of cracked rotor is an emerging area of research due to its practical importance and several issues are associated with this analysis due to its complexity and increasing demand of reliable crack detection techniques. It has been found in archival literature that various crack detection methodologies have been used to analyze the dynamic behaviour of a cracked rotor. The vibration problems of cracked rotor generally pose nonlinearity due to its breathing phenomena. Moreover, the theoretical and computational analysis of the non-linear problems seems to be complex and very expensive even with today’s powerful computers. In this work, extended Lagrangian formalism is used for the dynamic analysis of multi-cracked rotor. Another significant issue for the analysis of vibration of cracked rotor, is the analysis of symmetry breaking of cracked rotor, which is also analyzed in this work. However, this symmetry of rotor is disturbed if there is a small difference in material or geometric properties, caused due to initiation of a crack. The study investigates the dynamic behaviour of a finite asymmetric rotor through extended Lagrangian mechanics. Two case studies are analyzed and presented to develop analytical framework for these systems. Computational models are also developed through bondgraph modeling technique and simulations are carried out and compared with analytical results. vi Further, an extended Lagrangian–Hamiltonian formalism is employed to a continuous multi-cracked rotor system. Analytical formulation for amplitude and natural frequency is being derived through this extended Lagrangian–Hamiltonian methodology. Computational model through bondgraphs are being created. Simulations are carried out for various crack depth to analyze the dynamic behaviour of multi-crack rotor system. Finally, an experimental framework is being developed for the validation of simulation and analytical results. Variation of stiffness due to crack depth and effects of second crack are also determined. Amplitude of vibration at various speeds and different crack depths of multi-crack rotor are examined. NVGate® software is being used for capturing the various signals in running mode of machines. Experimental results validate the analytical and computational results to a great extent. Therefore, it is concluded that the extended Lagrangian methodology is one of the effective and accurate methods to determine dynamic characteristics of a multi-cracked shaft. It may be used for real-time monitoring of the rotor system in various industries.

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S, Bala Murugan. "Finite element analysis of multi-disk rotor-bearing system with transverse crack". Thesis, 2015. http://ethesis.nitrkl.ac.in/6647/1/THESIS-_BALA_MURUGAN_S_ROLL_NO._612ME310.pdf.

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Abstract (sommario):

The vibration analysis of rotating systems is pronounced as a key function in all the fields of engineering. The behavior of the rotor systems are mainly resulting from the excitations from its rotating elements. There are several numerical methods present to analyze the rotor-bearing systems. Finite element method is a key tool for dynamic analysis of rotor bearing system. The current study describes a multi disk, variable cross section rotor-bearing system with transverse crack on xisymmetric elements supported on bearings in a fixed frame. The shaft in the rotor-bearing system is assumed to obey Euler- Bernoulli beam theory. The equation of motion of the rotor-bearing system is derived by Lagrangian approach along with finite element method. Finite element model is used for vibration analysis by including rotary inertia and gyroscopic moments with consistent matrix approach. The rotor bearing system consists of two bearings and two rigid disks. One disk is overhung and the other one is placed between the bearings. Internal damping of the shaft and linear stiffness parameter of the bearings are taken into account to obtain the response of the rotor-bearing system. The rotor has variable cross-section throughout the configuration. The disks are modeled as rigid and have mass unbalance forces. The critical speed, unbalance response and natural whirls are analyzed for the typical rotor-bearing system with transverse crack. Analysis includes the effect of crack depths, crack location and spin speed. The results are compared with the results obtained from finite element analysis. The bearing configurations are undamped isotropic and orthotropic. The natural whirl speeds are analyzed for the synchronous whirl for both the uncracked and cracked rotor bearing system using Campbell diagrams. The effect of transverse crack over the starting point of the system instability regions in the rotating speed axis with zero asymmetric angle is examined. Further, Houbolt’s time integration scheme is used to obtain the phase diagrams and frequency response for both the bearing cases to study the stability threshold. Analyses are carried out by using numerical computing software.

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Capitoli di libri sul tema "MULTI CRACKED ROTOR"

Singh, S. K., R. Tiwari e S. Talukdar. "A Multi-Crack Identification Algorithm Based on Forced Vibrations from a Shaft System". In IUTAM Symposium on Emerging Trends in Rotor Dynamics, 505–13. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-94-007-0020-8_42.

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Yu, Tao, Ying Yang, Qing Kai Han, Hong Liang Yao e Bang Chun Wen. "ANN-Based Crack Identification in Rotor System with Multi-Crack in Shaft". In Key Engineering Materials, 2463–66. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.2463.

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Atti di convegni sul tema "MULTI CRACKED ROTOR"

Inoue, Tsuyoshi, Toshihiro Yamamichi, Masato Kato e Yukio Ishida. "Vibration Analysis and Detection of Rotor Crack in a Multi-Disk Rotor System by Periodic Excitation Using AMB". In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34639.

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Abstract (sommario):

Operating of rotating machinery with a rotor crack is a risk condition, since the rotor crack grows gradually and may fail causing a catastrophic accident. Therefore, it is very important to detect the occurrence of a crack on rotating machinery in early stages. The authors have used the simple two-degree-of-freedom cracked rotor model, and investigated the usage of periodic excitation for the detection of the rotor crack. This paper constructs a finite element rotor model with breathing crack element, and performs the numerical investigation. The dynamic responses of a cracked rotor system under applied periodical external excitation are investigated. The occurrences of various kinds of nonlinear sub-resonances are observed numerically, and the dynamical characteristics of these sub-resonances are clarified. The influences of the position and depth of the crack are clarified. Furthermore, these sub-resonances due to crack are observed in the experiment. This result made us enable to detect the occurrence of a rotor crack.

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Maleki, Yavar Keshtkar, Mir Saeed Safizadeh, Mehrdad Nouri Khajavi, Gholamhasan Payganeh e Safura Shuruni. "Over hang slant cracked rotor vibration signal processing based on discrete wavelet transform". In 2016 13th International Multi-Conference on Systems, Signals & Devices (SSD). IEEE, 2016. http://dx.doi.org/10.1109/ssd.2016.7473655.

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Han, Qinkai, e Fulei Chu. "Unbalanced Response of Cracked Rotor-Bearing System Under Time-Dependent Base Movements". In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62637.

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Unbalanced response of cracked rotor-bearing system under time-dependent base movements is studied in this paper. Three base angular motions, including the rolling, pitching and yawing motions, are assumed to be sinusoidal perturbations superimposed upon constant terms. Both the open and breathing transverse cracks are considered in the analysis. The finite element model is established for the base excited rotor-bearing system with open or breathing cracks. Considering the time-varying base movements and transverse cracks, the second order differential equations of the system will not only have time-periodic gyroscopic and stiffness coefficients, but also the multi-frequency external excitations. An improved harmonic balance method is introduced to obtain the steady-state response of the system under both base and unbalance excitations. The whirling frequencies of the equivalent time-invariant system, orbits of shaft center, response spectra and frequency response characteristics, are analyzed accordingly. The effects of various base angular motions, frequency and amplitude of base excitations, and crack depths on the system dynamic behaviors are considered in the discussions.

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Adewusi, S. A., e B. O. Al-Bedoor. "Detection of Propagating Cracks in Rotors Using Neural Networks". In ASME 2002 Pressure Vessels and Piping Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/pvp2002-1518.

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This paper presents the application of neural networks for rotor cracks detection. The basic working principles of neural networks are presented. Experimental vibration signals of rotors with and without a propagating crack were used to train the Multi-layer Feed-forward Neural Networks using back-propagation algorithm. The trained neural networks were tested with other set of vibration data. A simple two-layer feed-forward neural network with two neurons in the input layer and one neuron in the output layer trained with the signals of a cracked rotor and a normal rotor without a crack was found to be satisfactory in detecting a propagating crack. Trained three-layer networks were able to detect both the propagating and non-propagating cracks. The FFT of the vibration signals showing variation in amplitude of the harmonics as time progresses are also presented for comparison.

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Chandrasekaran, Shravankumar, e Rajiv Tiwari. "Model-Based Crack Identification Using Full-Spectrum". In ASME 2013 Gas Turbine India Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gtindia2013-3756.

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This paper illustrates the application of full-spectrum technique for model-based identification of the crack and unbalance multi-fault parameters in cracked rotor systems. The rotor model chosen is a Laval rotor with disc unbalance and transverse surface crack. The crack force model is a switching crack, which has harmonic components exciting the rotor both in the same and reverse directions of the rotor spin. Development of identification algorithm uses linearized equations of motion in frequency domain. Full-spectrum obtains the complex Fourier coefficients of the force as well as the response. Further usage of these coefficients in the identification algorithm estimates the viscous damping, disc eccentricity, and additive crack stiffness as fault parameters. The accuracy of estimates increases on considering measurements at multiple spin speeds. The algorithm tests reasonably robust for various levels of measurement noise and bias errors in system parameters.

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Jing, Jian Ping, e Guang Meng. "A New Method for Multi-Fault Diagnosis of Rotor System". In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-84178.

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A Blind Source Separation (BSS) based new method for multi-fault diagnosis of rotors is presented. The statistic variable based decorrelation approach is employed to analyze the signals of the rotors with crack and rub-impact, crack and oil-whirl multi-faults, the typical features of the frequency spectrum of each fault of the rotor are separated out. The separated results show that (1) the BSS technique is helpful to the multi-fault diagnosis of a rotor system. (2) Due to the signals in the same direction at different locations of a rotor is correlative in some extent, if the observed points are not chosen properly, the separated accuracy will be affected greatly. The analysis shows that: for a one shaft rotor, choosing the signals in x, y direction at a same point of a rotor will lead to a better separated result. (3) If want to applying the BSS to practical diagnosis of rotor system, some efforts and works still need to be done.

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Vashisht, Rajiv Kumar. "Model Based Determination of Size and Location of a Crack in a Rotor System Using Wavelet Transformation and Pattern Search Optimization". In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97072.

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Abstract Real rotor with multiple disks, ball bearings and flexible bearing supports has been considered in the present work. Reduced order model required for simulations of the dynamic system is developed using multi-objective genetic algorithms by matching its dynamic response with full order Finite Element Method based model. This enables us the possibility of including ball bearing dynamics as well as experimental data in model updating. In a rotating machinery, multiple types of faults can be expected during its service life, such as transverse breathing crack, looseness of bearing supports and unbalance. Rotor crack can be quantified by using the dynamic response of the rotor under coast up conditions in open loop situation using Pattern Search optimization. Wavelet transformations are used to denoise the signal and enhance the estimation accuracy.

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Gajjar, Mrugesh, Christian Amann e Kai Kadau. "High-Performance Computing Probabilistic Fracture Mechanics Implementation for Gas Turbine Rotor Disks on Distributed Architectures Including Graphics Processing Units (GPUs)". In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59295.

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Abstract We present an efficient Monte Carlo based probabilistic fracture mechanics simulation implementation for heterogeneous high-performance (HPC) architectures including CPUs and GPUs. The specific application focuses on large heavy-duty gas turbine rotor components for the energy sector. A reliable probabilistic risk quantification requires the simulation of millions to billions of Monte Carlo (MC) samples. We apply a modified Runge-Kutta algorithm in order to solve numerically the fatigue crack growth for this large number of cracks for varying initial crack sizes, locations, material and service conditions. This compute intensive simulation has already been demonstrated to perform efficiently and scalable on parallel and distributed HPC architectures including hundreds of CPUs utilizing the Message Passing Interface (MPI) paradigm. In this work, we go a step further and include GPUs in our parallelization strategy. We develop a load distribution scheme to share one or more GPUs on compute nodes distributed over a network. We detail technical challenges and solution strategies in performing the simulations on GPUs efficiently. We show that the key computation of the modified Runge-Kutta integration step speeds up over two orders of magnitude on a typical GPU compared to a single threaded CPU. This is supported by our use of GPU textures for efficient interpolation of multi-dimensional tables utilized in the implementation. We demonstrate weak and strong scaling of our GPU implementation, i.e., that we can efficiently utilize a large number of GPUs/CPUs in order to solve for more MC samples, or reduce the computational turn-around time, respectively. On seven different GPUs spanning four generations, the presented probabilistic fracture mechanics simulation tool ProbFM achieves a speed-up ranging from 16.4x to 47.4x compared to single threaded CPU implementation.

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Chen, Jingming, Dongxiang Jiang e Chao Liu. "Identification of Multi-Concurrent Fault in a Steam Turbine Rotor System Using Model-Based Method". In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94419.

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Fault identification and diagnosis of steam turbine generator unit is very important for safely and economically operation of a power plant. Currently, on-line monitoring is already widely utilized for alarming and recording in steam turbine. However, large amount of on-line monitoring data is not fully utilized to realize on-line fault diagnosis and identification, especially multi-concurrent fault. In the present study, model-based method was used for on-line vibrational fault identification and diagnosis based on rotordynamics. A 660MW supercritical steam turbine rotor system was modeled using FEM. Single faults, such as mass unbalance, local shaft bow and transverse crack, and multi-concurrent faults were simulated. Fault-induced changes of equivalent loads were analyzed to figure out fault type, location and severity. For model-based method, fault diagnosis accuracy is influenced by the model accuracy and signal noise. Model sensitivity was studied in this research by comparing the influence of different model error and SNR (Signal to Noise Ratio). It was used to evaluate the degree of confidence of the diagnosis result. The smaller was the model sensitivity, the higher was the degree of confidence. Based on this research, model-based method was utilized to analyze real vibration signals extracted from the historical data of this unit. Fault identification result was an effective basis for conditioned based maintenance.

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Nouri-Baranger, Thouraya, Mohamed Torkhani e Guillaume Altmeyer. "Application of Arlequin Framework for the Numerical Simulation of Rotating Machinery". In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64695.

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Abstract (sommario):

Rotating machinery are a place where specific vibrating phenomena take place, due to particular loadings, rotating effects and damping. Numerous numerical simulation of rotating machinery are based on the use of costless beam models. These models are however insufficient to represent localized non-linear phenomena. In these zones, 3D models are more adapted to accurately represent the effects of contact or cracks. Their cost is however prohibitive for industrial applications. In this paper, development of a method coupling 1D and 3D models is proposed to simulate advanced dynamic of rotating machinery. The bases of Arlequin method, allowing multi-model/multi-scheme connecting the different zones by a superposition technique, are developed and applied to the simulation of contact between rotor and stator. Specific operators are introduced, such as gyroscopic matrix, angular acceleration matrix and centrifugal stiffening one.

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