Mathematical Modelling of Dynamic System Rotor-Groove Seals for the Purposes of Increasing the Vibration Reliability of NPP Pumps

Шевченко, С.С.; Shevchenko, O.; Vynnychuk, Stepan

doi:10.32918/nrs.2021.1(89).09

Cited by 10 publications

(6 citation statements)

References 1 publication

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“…Effect of seals on the dynamic characteristics of the rotor systems frequency response. Oscillations of the rotor under the action of gyroscopic forces and moments arising in the seals are described by the equations [20]:…”

Section: Model Of the Hydromechanical Rotor-groove Seal Systemmentioning

confidence: 99%

Research on Improving Seals to Suppress Vibration of Rotary Machines

Lu,

Shevchenko,

Geichuk

et al. 2024

C. R. Acad. Bulg. Sci.

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There is a constant demand for higher equipment parameters, such as pressure of a sealing medium and shaft rotation speed. However, as the parameters rise it becomes more difficult to ensure hermetization efficiency. Moreover, sealing systems affect the overall operational safety of the equipment, especially vibratory. Non-contact seals are considered hydrostatodynamic supports that can effectively damp rotor oscillations. Models of an impulse and a groove seals, models of rotor-seals system and rotor-auto-unloading system, models of a shaftless pump are studied to evaluate the effect of these sealing systems on oscillatory characteristics of rotor. Analytical dependencies for computation the dynamic characteristics of impulse seals, hydromechanical systems rotor-seals and rotor-auto-unloading, as well as shaftless pumps are obtained. These dependencies describe the radial-angular vibrations of a centrifugal machine rotor in seals-supports. Equations for computation the amplitude-frequency characteristics are given. The directions of improving the environmental safety of critical pumping equipment by purposefully increasing the rigidity of non-contact seals that leads to higher rotor vibration stability have been determined.

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Section: Model Of the Hydromechanical Rotor-groove Seal Systemmentioning

confidence: 99%

Research on Improving Seals to Suppress Vibration of Rotary Machines

Lu,

Shevchenko,

Geichuk

et al. 2024

C. R. Acad. Bulg. Sci.

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“…The model of the "rotor-slotted seals" hydromechanical system, presented in paper [58], is shown in Figure 1. x, y, ϑ x , ϑ y , Δp(ω)…”

Section: Algorithm For Constructing Dynamic Characteristics Of Non-co...mentioning

confidence: 99%

“…Forced joint radial-angular vibrations of the rotor in slotted seals are described by the equations [58]…”

Section: Frequency Characteristics and Evaluation Of Dynamic Stabilitymentioning

confidence: 99%

Methodology of Designing Sealing Systems for Highly Loaded Rotary Machines

Шевченко

Radchenko

et al. 2022

Sustainability

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Higher parameters of centrifugal machines are constantly required, such as the pressure of the medium to be sealed and the speed of rotation of the shaft. However, as the parameters increase, it becomes more and more difficult to ensure the effectiveness of sealing. In addition, sealing systems affect the overall safety of equipment operation, especially vibration. In order to harmonize the sealing functions and increase the dynamic rigidity of the rotors of centrifugal machines, a method for modeling complex sealing systems has been developed. Non-contact seals are considered as hydrostatic–dynamic bearings that can effectively dampen rotor oscillations. A general approach to the analysis of non-contact seals as automatic control systems and an algorithm for constructing their dynamic characteristics at the design stage were proposed for the first time. Models of “rotor-gap seal”, impulse seal and “rotor–hydraulic face” systems, and seal-supports of a shaftless pump have been studied to assess the effect of these seal systems on the oscillatory characteristics of the rotor. Analytical dependencies are obtained for calculating the dynamic characteristics and stability limits of seals as hydromechanical systems. The directions for improving the safety of operation of critical pumping equipment due to a targeted increase in the rigidity of non-contact seals are determined, which leads to an increase in the vibration resistance of the rotor and the environ-mental safety of centrifugal machines. The paper proposes a method for designing sealing systems based on the configuration of sealing components in order to achieve harmonization between sealing and vibration reliability, taking into account oscillatory processes due to hydrodynamic sealing characteristics.

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“…From the viewpoint of reliability, pumps are equipment with an active principle of action, that is, equipment that is complex in design and interconnected with other devices on which its efficiency depends. The issues of ensuring the reliability of such equipment are particularly complex and urgent [3]. Specialists who operate NPP pumping equipment should understand the role and purpose of each pump type in the overall system of a nuclear power plant, their relationship and interaction with other units.…”

Section: Introductionmentioning

confidence: 99%

Increasing the Operational Safety of NPP Pumping Equipment by Using Interactive Automated Remote Educational and Training Systems

Shevchenko,

Shevchenko

2024

Nucl. and Rad. Safe.

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The main attention during the operation of the nuclear power plant is paid to the issue of nuclear and radiation safety. NPP pumping equipment is the most important element of the safety system. Specialists who operate NPP pumping equipment need an understanding of the role and purpose of each pump type in the overall nuclear power plant system. The reliable and uninterrupted operation of energy facilities depends on the training and maintenance of personnel qualification at the appropriate level. Due to the correct equipment operation, it is possible to increase the safety and reliability of power units, extend the service life, increase the energy efficiency of mechanisms and systems, which requires a high level of qualification of maintenance specialists. An effective solution for training of NPP technical specialists is offered. The structure of an interactive educational system with the introduction of learning scenarios is considered, which allows effective preservation and transfer of knowledge and skills. Ways of evolution for this class systems and areas of further research are considered.

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Mathematical Modelling of Dynamic System Rotor-Groove Seals for the Purposes of Increasing the Vibration Reliability of NPP Pumps

Cited by 10 publications

References 1 publication

Research on Improving Seals to Suppress Vibration of Rotary Machines

Research on Improving Seals to Suppress Vibration of Rotary Machines

Methodology of Designing Sealing Systems for Highly Loaded Rotary Machines

Increasing the Operational Safety of NPP Pumping Equipment by Using Interactive Automated Remote Educational and Training Systems

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