Evaluation of gas turbine rotor dynamic analysis using the finite element method

Taplak, Hamdi; Parlak, Mehmet

doi:10.1016/j.measurement.2012.01.032

Cited by 62 publications

(41 citation statements)

References 16 publications

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“…The bracketed matrix, in equation 10, is called the field matrix and relates the variables on the left and right hand sides of the th field (beam). (10) where is the shaft station length, is modulus of elasticity, and is the area moment of inertia for the shaft station.…”

Section: Transfer Matrix Methodsmentioning

confidence: 99%

“…These preloads have a significant effect on the deflections and stresses, which modifies the modal analysis. Taplak and Parlak [10] made a dynamical analysis of a gas turbine rotor using the Dynrot program with code based on the finite element method, they found the system has an unstable behavior when it is near to the critical speeds, and that small imbalance values do not affect the behavior but decrease the critical speeds. Pagar and Gawande [11] obtained the natural frequencies and mode shapes of a rotor shaft using ANSYS, and validated the results with an experimental test using FFT (Fast Fourier Transform) analyzer.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic model for high-speed rotors based on their experimental characterization

Montoya¹,

Rodriguez²,

Mejía³

2017

Appl. Theory Comput. Technol.

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Abstract:Rotating systems components such as rotors, have dynamic characteristics that are of great importance to understand because they may cause failure of turbomachinery. Therefore, it is required to study a dynamic model to predict some vibration characteristics, in this case, the natural frequencies and mode shapes (both of free vibration) of a centrifugal compressor shaft. The peculiarity of the dynamic model proposed is that using frequency and displacements values obtained experimentally, it is possible to calculate the mass and stiffness distribution of the shaft, and then use these values to estimate the theoretical modal parameters. The natural frequencies and mode shapes of the shaft were obtained with experimental modal analysis by using the impact test. The results predicted by the model are in good agreement with the experimental test. The model is also flexible with other geometries and has a great time and computing performance, which can be evaluated with respect to other commercial software in the future.

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Section: Transfer Matrix Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic model for high-speed rotors based on their experimental characterization

Montoya¹,

Rodriguez²,

Mejía³

2017

Appl. Theory Comput. Technol.

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“…Among these tools, the mathematical simulations are the least expensive and can obtain results more quickly. One of the most frequently used mathematical simulation methods is the finite element method, which generates and solves a system of differential equations that simulate the physical behavior under investigation (Taplak & Parlak, 2012). However, to perform computer simulations for testing different mechanical harvesting scenarios, input parameters related to the geometrical, physical and mechanical properties of the systems are required.…”

Section: Introductionmentioning

confidence: 99%

<b>Dynamic test for determining the elastic modulus of coffee fruit-stem-branch system

et al. 2017

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ABSTRACT. The finite element method, which has been used to determine natural frequencies and mode shapes, is used to generate and solve differential equations that describe the investigated physical phenomenon. However, this method requires the use of geometric and mechanical properties as input parameters, which may be difficult to obtain experimentally. The objective of this study was to develop a method for determining the elastic moduli of coffee stems and branches by comparing the experimentally obtained natural frequency with the frequency obtained using the finite element method. The natural frequency was experimentally obtained using a dynamic sweep test of frequencies, in which the fruit-stembranch system was excited over a range from 10 to 30 Hz. The natural frequency of the fruit-stem system was higher at the green stage than at the cherry stage, and the elastic modulus of the stem at the cherry stage was higher than for the green stage. The mean elastic modulus values were 15.74, 23.90 and 4645.90 MPa for the stem at the green and cherry stages and for the branch, respectively.Keywords: algorithm, finite element method, natural frequency.Ensaio dinâmico para determinação do módulo de elasticidade do sistema frutopedúnculo-ramo RESUMO. Entre as ferramentas para determinação das frequências naturais e modos de vibração tem-se a modelagem pelo método dos elementos finitos, que consiste na geração e solução de equações diferenciais que descrevem o fenômeno físico em estudo. No entanto, essa ferramenta exige como parâmetros de entrada as propriedades geométricas e mecânicas do sistema, difíceis de serem obtidas experimentalmente. Assim, objetivou-se desenvolver uma metodologia para a determinação do módulo de elasticidade do pedúnculo e do ramo do cafeeiro por meio da comparação da frequência natural experimental com a frequência obtida pelo método de elementos finitos. A frequência natural experimental foi obtida a partir de um ensaio de varredura de frequências, em que o sistema fruto-pedúnculo e o ramo foram excitados em uma faixa de 10 a 30 Hz. A partir dos resultados, verificou-se que a frequência natural do sistema frutopedúnculo no estádio de maturação verde foi superior ao cereja e que o módulo de elasticidade do pedúnculo no estádio de cereja foi superior ao valor para verde. Os valores médios para os módulos de elasticidade foram de 15,74; 23,90 e 4645,90 MPa para o pedúnculo nos estágios de maturação verde, cereja e para o ramo, respectivamente.Palavras-chave: algoritmo, método de elementos finitos, frequência natural.

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“…Whalley and Abdul-Ameer (2009), by using simple harmonic response methods, they used contoured shaft profiles in order to obtain the natural frequencies and critical speeds of rotor shaft systems. Taplak and Parlak (2012) used the Dynrot program based on finite element method for performing the rotordynamics analysis of gas turbine with certain mechanical and geometrical properties. This program was used to obtain Campbell diagram, determining critical speeds and investigating imbalance response of the rotor due to mass unbalance of compressor.…”

Section: Introductionmentioning

confidence: 99%

“…This program was used to obtain Campbell diagram, determining critical speeds and investigating imbalance response of the rotor due to mass unbalance of compressor. Jalali et al (2014) investigated full analysis of rotordynamics on high speed turbine-impeller system using finite element model of ANSYS program and onedimensional beam and experiment of modal testing as performed by (Taplak and Parlak, 2012), the diagram of Campbell, critical frequencies and imbalance response analysis due to mass unbalance were obtained using the two models of ANSYS and one-dimensional finite element. Based on the comparing results of theoretical and experiment show that the good accuracy of the behavior of such systems can be achieved using two of these models.…”

Section: Introductionmentioning

confidence: 99%

Identification of a Machine Tool Spindle Critical Frequency through Modal and Imbalance Response Analysis

Jauhari¹,

Widodo²,

Haryanto³

2016

American Journal of Engineering and Applied Sciences

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Abstract:The most important part for machine tool system is spindle system. The structural properties of spindle will affect to the productivity of machining process and the work pieces quality. Thus it is necessary and very important to know its spindle dynamic behaviors for avoiding forced vibration due to resonance. The Finite Element Method (FEM) has been adopted for obtaining spindle dynamic behaviors. FEM model and analysis of dynamic behaviors for the spindle system are similar to those developed in rotor-dynamic. The main purpose of this study, we implemented an ANSYS Parametric Design Language (APDL) program based on finite element method for obtaining full analysis of rotor dynamic in order to investigate the spindle dynamic behaviors. The programs efficiently performed the full analysis by determining the Campbell diagrams, critical speeds and response of imbalance due to mass unbalance at the cutting tool. Results show that the critical speeds were calculated previously are far enough from the spindle speeds operating range, then the spindle would not experience resonance and the maximum response of imbalance occurs on operating speed is also in acceptable limit. ANSYS Parametric Design Language (APDL) can be used by spindle designer as tools in order to increase the product quality, reducing cost and time consuming in the design and development stages.

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Evaluation of gas turbine rotor dynamic analysis using the finite element method

Cited by 62 publications

References 16 publications

Dynamic model for high-speed rotors based on their experimental characterization

Dynamic model for high-speed rotors based on their experimental characterization

<b>Dynamic test for determining the elastic modulus of coffee fruit-stem-branch system

Identification of a Machine Tool Spindle Critical Frequency through Modal and Imbalance Response Analysis

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