A coupling vibration model of multi-stage pump rotor system based on FEM

Wang, Leqin Leqin; Zhou, Wenjie; Wei, Xuesong; Zhai, Lulu; Wu, Guangkuan

doi:10.5755/j01.mech.22.1.11420

Cited by 16 publications

(9 citation statements)

References 12 publications

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“…In addition, as redundant design and dynamic logic gates are introduced, systems become more complex and sophisticated, and traditional analysis methods no longer apply. Thus, new methods are required to assess the reliability parameters from the perspective of multi-states or multi-stages to decrease the downtime probability and degradation of complex systems [ 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

Reliability modelling and analysis of a multi-state element based on a dynamic Bayesian network

Li¹,

Xu²,

Gu³

et al. 2018

R. Soc. open sci.

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This paper presents a quantitative reliability modelling and analysis method for multi-state elements based on a combination of the Markov process and a dynamic Bayesian network (DBN), taking perfect repair, imperfect repair and condition-based maintenance (CBM) into consideration. The Markov models of elements without repair and under CBM are established, and an absorbing set is introduced to determine the reliability of the repairable element. According to the state-transition relations between the states determined by the Markov process, a DBN model is built. In addition, its parameters for series and parallel systems, namely, conditional probability tables, can be calculated by referring to the conditional degradation probabilities. Finally, the power of a control unit in a failure model is used as an example. A dynamic fault tree (DFT) is translated into a Bayesian network model, and subsequently extended to a DBN. The results show the state probabilities of an element and the system without repair, with perfect and imperfect repair, and under CBM, with an absorbing set plotted by differential equations and verified. Through referring forward, the reliability value of the control unit is determined in different kinds of modes. Finally, weak nodes are noted in the control unit.

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Section: Introductionmentioning

confidence: 99%

Reliability modelling and analysis of a multi-state element based on a dynamic Bayesian network

Li¹,

Xu²,

Gu³

et al. 2018

R. Soc. open sci.

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“…The displacement of any point on the axis of worm unit can be expressed as formula (32). 4,7,10,13,16,19,22 5,8,11,14,17,20,23…”

Section: ) Worm Unit Finite Element Modelmentioning

confidence: 99%

“…is an indispensable tool in engineering analysis [19], and it has been applied in many fields, such as literature [20]- [26]. So FEM is used to build the dynamic model of key metaaction unit herein.…”

Section: Introductionmentioning

confidence: 99%

Reliability and Modal Analysis of Key Meta-Action Unit for CNC Machine Tool

Zhang

Ran

et al. 2019

IEEE Access

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Dynamic characteristics have an important impact on the reliability of computer numerical control (CNC) machine tool. As the basis of dynamic characteristics analysis, the modal analysis should be conducted. However, the current modal analysis methods have some shortcomings. For example, the selected research object cannot reflect the dynamic characteristics of the CNC machine tool, the selection of research object lacks a scientific basis, and the influence of coupling factors is also often ignored. To address these problems, the concepts of meta-action failure mode and the latest research results about meta-action were given herein. Meta-action unit is the smallest structural unit to ensure the normal operation of the machine tool, and it can fully reflect the dynamic characteristics of a machine tool, so it is taken as the research object. In order to reduce the blindness of selecting the analytic object when implementing the reliability improvement measures, we put forward the concept of a key meta-action unit and gave the corresponding extraction method. Meanwhile, electromechanical coupling was considered when built the dynamic model of a key meta-action unit. A CNC machine tool made in China was taken as an example, and a key meta-action unit was extracted and analyzed, then the corresponding reliability improvement measures were also given. The results verify the applicability and effectiveness of this method. The proposed method can solve the shortcomings of the current methods, which lays a foundation for further research of mechanical properties and reliability based on machine tool meta-action unit. INDEX TERMS CNC machine tool, modal analysis, failure mode, reliability, key meta-action unit.

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“…The dynamic analysis of the centrifugal pump rotor is important and essential for a centrifugal pump system. In order to reduce the research difficulty, a linear model has been often applied in the investigation into dynamic characteristics of a rotor system, such as critical speeds, mode shape as well as unbalanced responses, as mentioned in [1][2][3][4][5][6]. For some structures, when the vibration response is small, the linear model may be sufficient for a dynamic analysis of a centrifugal pump rotor.…”

Section: Introductionmentioning

confidence: 99%

Research on Steady-State Characteristics of Centrifugal Pump Rotor System with Weak Nonlinear Stiffness

Zhou

Qiu

Zhang

et al. 2018

TFAMENA

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Steady-state vibration response characteristics of a motion model of a centrifugal pump rotor system with weak nonlinear stiffness have been calculated by using the multiple scale method (MSM). The theoretical results were in good agreement with the numerical results. Based on the MSM and the numerical method, the effects of detuning parameter, nonlinear stiffness parameter and natural frequency on steady-state amplitude were also investigated. Finally, Lyapunov's theorem on stability in the first approximation was applied for the determination of the system's stable and unstable solution regions. The calculated results imply that the centrifugal pump rotor system with weak nonlinear stiffness exhibits typical nonlinear vibration characteristics. The variation of detuning parameter, nonlinear stiffness parameter and natural frequency can result in a jump phenomenon, and their corresponding curves present 'hard spring', 'soft spring' and 'S'-shaped amplitude characteristic, respectively. Smaller detuning parameter and natural frequency or greater nonlinear stiffness parameter are beneficial to decreasing the steady-state response amplitude. The results can provide reference for an investigation into nonlinear vibration characteristics of a centrifugal pump rotor system.

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A coupling vibration model of multi-stage pump rotor system based on FEM

Cited by 16 publications

References 12 publications

Reliability modelling and analysis of a multi-state element based on a dynamic Bayesian network

Reliability modelling and analysis of a multi-state element based on a dynamic Bayesian network

Reliability and Modal Analysis of Key Meta-Action Unit for CNC Machine Tool

Research on Steady-State Characteristics of Centrifugal Pump Rotor System with Weak Nonlinear Stiffness

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