Investigation of Non-linear Reactions in Rotors’ Bearing Supports of Turbo-pump Units for Liquid Rocket Engines

Pavlenko, Ivan; Simonovskiy, V.; Piteľ, Ján; Demianenko, Maryna; Verbovyi, A.

doi:10.21272/jes.2018.5(1).d2

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…The design scheme of the rotor of the oxidizer turbopump of the liquid rotor engine is presented in Figure 3 [7]. As a result of numerical calculation, the following values for elements of quadratic matrix (5) After considering the regression dependence (7), the unknown parameters α, β, and γ have been evaluated and summarized in Table 2. 1 with the proposed mathematical model (1) for the data presented in Table 2 substantiates the reliability of the proposed approach.…”

Section: Resultsmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

“…Study [7] describes rotor dynamics of the rotation of moving parts and the compliance of bearing support elements. This article also describes an approach to studying nonlinear reactions in rotor supports.…”

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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“…The problem of identification of the nonlinear bearing stiffness is highlighted in recent research works. Particularly, the paper [1] dials with the investigation of nonlinear reactions in rotors' bearing supports of turbopump units for liquid rocket engines. However, this work does not consider the impact of initial bearing gap and axial preloading.…”

Section: 2 Literature Reviewmentioning

confidence: 99%

“…In this case, the estimation of the coefficient α is carried out by the linear regression formula [1]:…”

mentioning

confidence: 99%

Comprehensive Approach for Identification of Nonlinear Stiffness Characteristics of Bearing Supports for the Oxidizer Turbopump of the Liquid Rocket Engine

Pavlenko¹,

Demyanenko²,

Edl³

et al. 2018

JES

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This article dials with the refinement of the mathematical and computational models of the oxidizer turbopump rotor considering bearing gaps, axial preloading, compliance of the housing parts and the effect of rotation. The loading scheme consists of four substeps is proposed considering preliminary displacement of the outer cage, axial displacement as a result of the support deformation due to the axial preloading force, radial displacement due to the support deformation, as well as centrifugal forces of inertia caused by rotation of the rotor with an inner cage. Modelling of contacts interactions using ANSYS software is carried out according to the appropriate models of contact behaviour. The contact areas between the rolling elements, inner and outer cases are obtained. The contact angle is determined. Isosurfaces of axial and radial displacements for the bearing supports are built. Nonlinear stiffness of bearing supports is determined as the tangent of the angle of inclination for the curve "radial loadradial displacement". The proposed approach, which used for designing turbopump units for liquid rocket engines, will allow refining the reliable mathematical and computational models of rotor dynamics for turbopump units and providing appropriate computer simulation of forced oscillations of the rotor systems for given permissible residual imbalances considering nonlinear stiffness characteristics of bearing supports.

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Calculation of the Centrifulal Pump Critical Frequencies Based on Its Discrete Mathematical Model

Verbovoy

Sieryk

Pavlenko

et al. 2021

JNAM

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Calculations of the centrifugal machines critical frequencies of the rotors are currently carried out on the basis of the finite element method using multi-functional software as same as ANSYS and other similar, that work with finite elements of the three-dimensional type, as well as some specialized computer programs working with the beam-type finite elements. Anyway, the finite element method is used. But in this case an user needs a lot of time for prepation of the initial data. Therefore, this article presents a calculation of the critical frequencies of the rotor of a centrifugal fuel pump of a liquid-propellant engine based on its discrete model. This calculation also includes an algorithm of results clarification. This model has been verificated by comparing the critical frequencies obtained in calculations based on the finite element beam model and discrete model with using the algorithm of results clarification and without it.

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Investigation of Non-linear Reactions in Rotors’ Bearing Supports of Turbo-pump Units for Liquid Rocket Engines

Cited by 4 publications

References 7 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

Comprehensive Approach for Identification of Nonlinear Stiffness Characteristics of Bearing Supports for the Oxidizer Turbopump of the Liquid Rocket Engine

Calculation of the Centrifulal Pump Critical Frequencies Based on Its Discrete Mathematical Model

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