Effects of flexible support stiffness on the nonlinear dynamic characteristics and stability of a turbopump rotor system

Chen, Bai; Xu, Quan; Wang, Jiyan

doi:10.1007/s11071-010-9858-4

Cited by 11 publications

(6 citation statements)

References 18 publications

(27 reference statements)

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“…Bai et al [3] studied the impact of flexible support stiffness on rotor systems' dynamic characteristics and stability. Xu et al [4] investigated the impact of bearing stiffness on the nonlinear dynamics of shafts in drive systems.…”

Section: Literature Reviewmentioning

confidence: 99%

Parameter Identification of Nonlinear Bearing Stiffness for Turbopump Units of Liquid Rocket Engines Considering Initial Gaps and Axial Preloading

Verbovyi¹,

Khomenko²,

Neamțu³

et al. 2021

JES

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This article is devoted to developing a mathematical model of nonlinear bearing supports for turbopump units of liquid rocket engines considering initial gaps and axial preloading. In addition to the radial stiffness of the bearing support, this model also considers the stiffness of the bearing cage, the rotational speed of the rotor, axial preloading of the rotor (due to which the inner cage shifts relative to the outer, changing the radial stiffness of the support), as well as radial gaps between contact elements of the bearings. This model makes it possible to calculate the stiffness of the bearing supports more accurately. The proposed model is realized using both the linear regression procedure and artificial neural networks. The model’s reliability is substantiated by the relatively small discrepancy of the obtained evaluation results with the experimental data. As a result, this model will allow determining the critical frequencies of the rotor with greater accuracy. The results have been implemented within the experience of designing turbopump units for State Company “Yuzhnoye Design Office”.

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Section: Literature Reviewmentioning

confidence: 99%

Parameter Identification of Nonlinear Bearing Stiffness for Turbopump Units of Liquid Rocket Engines Considering Initial Gaps and Axial Preloading

Verbovyi¹,

Khomenko²,

Neamțu³

et al. 2021

JES

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“…1) was used in Ref. [26] to investigate its deterministic dynamic characteristics. In the current study, the system is used to demonstrate the proposed formulations of a stochastical finite element modeling and random response analysis of rotor system.…”

Section: Numerical Examplesmentioning

confidence: 99%

Stochastic finite element modeling and response analysis of rotor systems with random properties under random loads

2015

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Random properties and random loads are highly important in rotor dynamic analysis because they cause system dynamic responses to behave randomly. In this paper, a stochastical finite element of rotating shaft based on Timosheko beam theory is proposed for rotor system modeling, in which material and geometric random properties are considered one-dimensional stochastic field functions. A random response analytical method is developed to determine the statistics of the dynamic responses of stochastical rotor systems under random loads. The numerically obtained whirl speed of a turbopump rotor system is compared with the test data to validate the proposed model, and good agreement is observed. Linear and nonlinear turbopump rotor systems are employed to compare the results obtained from the proposed model and the Monte Carlo simulation. The numerically predicted results, which coincide well with Monte Carlo simulation data, demonstrate the feasibility and efficiency of the proposed stochastic model and method for actual rotor system analysis and design.

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“…Therefore, it is necessary to study the stiffness of the elastic ring. [7][8][9] With the development of finite element technology and computer technology, finite element simulation has gradually become an important tool for designers to carry out structural design and analysis. [10][11][12][13][14][15][16][17] The elastic ring assembled structure is shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations on novel models for mechanical behaviors of the elastic ring in aero-engine

Zhang

Yang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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The elastic ring is widely used in elastic support structures of aero-engine because of its simple structure and convenient manufacturing. In this paper, two elastic ring models, 3D and 2D models, are proposed, where the fillets between the bulges and ring are considered. The 2D model is more efficient for the calculation of stiffness characteristics. The 3D model can be used to obtain the maximum stress position in the axial direction. Then the experimental testing is carried out to verify the accuracy and effectiveness of the proposed models. Based on the proposed models, the stiffness nonlinearity and critical load of the elastic ring are found for the first time, which can be used to determine the normal working load range. Moreover, the elastic ring models with and without fillets are developed, and the effect of the fillets on stress is discussed. The results show that the stress is reduced by considering the fillets, which are not considered in the existing literature.

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Effects of flexible support stiffness on the nonlinear dynamic characteristics and stability of a turbopump rotor system

Cited by 11 publications

References 18 publications

Parameter Identification of Nonlinear Bearing Stiffness for Turbopump Units of Liquid Rocket Engines Considering Initial Gaps and Axial Preloading

Parameter Identification of Nonlinear Bearing Stiffness for Turbopump Units of Liquid Rocket Engines Considering Initial Gaps and Axial Preloading

Stochastic finite element modeling and response analysis of rotor systems with random properties under random loads

Experimental and numerical investigations on novel models for mechanical behaviors of the elastic ring in aero-engine

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