Problems of Rotordynamic Modeling for Built-Up Gas Turbine Rotors with Central Tie Rod Shaft

Shaposhnikov, Konstantin; Gao, Chuang

doi:10.1007/978-3-319-99270-9_18

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…The effect of pretightening force on the equivalent stiffness of contact areas was investigated. Shaposhnikov and Gao [9] established both the 3D model and the 1D beam model for a central tie rod rotor via finite element software. The error between the two models was reduced via the modification on the stiffness of the contact region according to the strain energy distribution in each mode.…”

Section: Introductionmentioning

confidence: 99%

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An Efficient Dynamic Modeling Technique for a Central Tie Rod Rotor

Liu

Fei

Wu³

et al. 2021

International Journal of Aerospace Engineering

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Compared with the three-dimensional rotor model for a central tie rod rotor, an equivalent one-dimensional model can greatly improve the computational efficiency in rotor dynamics analysis with a certain accuracy. However, little research work can be found on improving the modeling accuracy of one-dimensional models using experimental data. In this paper, a one-dimensional discrete mass model considering pretightening force is proposed for central tie rod rotors to achieve the purpose of both efficient and accurate modeling. Experimental testing and three-dimensional model analysis are used as reference and verification approaches. A sensitivity-based method is adopted to update the proposed one-dimensional model via minimizing the error in the critical speed comparing with the corresponding three-dimensional finite element model which has been verified by a modal test. Prediction of damped unbalanced response is conducted to show the practicality of the updated one-dimensional model. Results show that the method presented in this research work can be used to simulate a complex preloaded rotor system with high efficiency and accuracy.

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Section: Introductionmentioning

confidence: 99%

“…Although the beam model has been widely adopted in the design stage of a rotor, this model is more rigid than the real rotor [9]. According to the author's knowledge, limited studies on the model updating of the 1D model of the central tie rod rotor based on damped critical speed have been conducted.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Dynamic Modeling Technique for a Central Tie Rod Rotor

Liu

Fei

Wu³

et al. 2021

International Journal of Aerospace Engineering

View full text Add to dashboard Cite

show abstract

“…In the framework of aeroengines, the requirement of a high thrust-to-weight ratio renders a more complex structure connected by bolted joint and spline coupling joint [1,2]. Concerning gas turbines, two combined rotor profiles can be distinguished: multistage disks are clamped either by a central tie-bolt [3,4] or by several circumferentially distributed rods [5,6]. Furthermore, combined rotor with a single central tie-bolt is also applied in centrifugal compressors [7,8].…”

Section: Introductionmentioning

confidence: 99%

Determination of Contact Stiffness and Damping of a Tie-Bolt Rotor with Interference Fits Using Model Updating with Thin-Layer Elements

Yuan

2020

Shock and Vibration

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Tie-bolt rotors are commonly applied in aeroengines and gas turbines, and interference fits ensure accurate positioning for disk assembling. This paper presents experimental and numerical studies on the stiffness and damping properties of a tie-bolt rotor with interference fits under different preloads. An FE model incorporating thin-layer elements is used to carry out model updating to predict the contact stiffness and damping characteristics. A two-step model updating approach of the tie-bolt rotor using the response surface optimization is implemented. Finally, a quasistatic FE simulation concerning the interference fits and sensitivity analysis is performed to validate the experimental results. Press fit induces a bilinear contact stiffness. Also, modal damping demonstrates a more sensitive and nonmonotonic behavior versus preload.

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Stress variation of a gas turbine tie-bolt rotor with Hirth serrations considering assembling and thermal effects

Yuan

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Tie-bolt rotors are commonly applied in heavy-duty gas turbines due to a better stiffness-mass ratio behavior compared to traditional integral rotors. In order to achieve a steady transformation from mechanical energy to electricity, the clamping force of the bolt is critical to keep multiple disks as a whole unit. However, the tensile stress of the bolt is changing during rotor assembly as well as operational conditions that should be considered carefully for the rotor safety. Moreover, subjected to mechanical as well as thermal loads, the stress of the rotor disks is a complicated mixture by different applied forces. In this manuscript, the preload variation during the process of rotor assembling is studied analytically with the help of the stiffness analysis. Then, a steady thermal analysis is performed with appropriate boundary conditions. Making use of the thermal-mechanical approach, a steady-stress distribution under different load combinations is achieved. Furthermore, a thorough insight into the stress level as well as the contact pressure of Hirth serrations is presented.

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Problems of Rotordynamic Modeling for Built-Up Gas Turbine Rotors with Central Tie Rod Shaft

Cited by 4 publications

References 8 publications

An Efficient Dynamic Modeling Technique for a Central Tie Rod Rotor

An Efficient Dynamic Modeling Technique for a Central Tie Rod Rotor

Determination of Contact Stiffness and Damping of a Tie-Bolt Rotor with Interference Fits Using Model Updating with Thin-Layer Elements

Stress variation of a gas turbine tie-bolt rotor with Hirth serrations considering assembling and thermal effects

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