Effect of Unbalanced Magnetic Pull of Generator Rotor on the Dynamic Characteristics of a Pump—Turbine Rotor System

Round 1

Reviewer 1 Report

Include other textbook references; example: Dara Childs: https://www.amazon.com/Turbomachinery-Rotordynamics-Phenomena-Modeling-Analysis/dp/047153840X

J. S. Rao: https://www.amazon.com/Rotor-Dynamics-Third-J-S-Rao/dp/8122409776

There are other books too on dynamic modeling vertical pumps that the authors can search and include.

1) What about the effect of flutter on the overall unbalance response of the pump?

2) What about the effects of flow-induced vibrations on the stability of the pump.

3) Effect and amount of of NVH generated on the performance of the turbo-pump system?

4) I might have missed it, but are the equations modelled using a math tool such as MatLab or Simulink? Why? Why not?

5) If any other researcher carried experimental modal analysis, how close your simulation results match theirs?

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

 

The topic of the manuscript is interesting. Some suggestions are as follows:

1.        The format of references in the introduction is incorrect.

2.        Figure 1 Chinese should be changed to English.

3.        Some figures should be a higher resolution.

4.        Some numerical validation should be added in the manuscript.

5.        More analyses should be added in the Part 3.

Author Response

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Author Response File: Author Response.pdf

Reviewer 3 Report

The paper sounds very interesting and has the potential to publish. The authors should revise the paper according to the following major comments: 

- The abstract should present the aim of the research. It should be very short and focus on the question of the research, the results of the research, and the method to obtain that results. 

-  Nomenclature must be added to the paper.

- Physical units must be added to the paper as well as for every parameter.

- Figure 1 contains words not in English. Please fix this issue.

- The following paper can be added to the current research:

1: Ma, C., Zhao, D., Liao, W., Sun, W., Guo, P., & Xu, Y. (2022). Effect of the unbalanced magnetic pull force and oil-film force on nonlinearity of a dual-rotor bearing system. In Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics (Vol. 236, Issue 4, pp. 623–638). SAGE Publications. https://doi.org/10.1177/14644193221121975

2: Nave, Op., & Sharma, M. (2019). Singular Perturbed Vector Field (SPVF) Applied to Complex ODE System with Hidden Hierarchy Application to Turbocharger Engine Model. In International Journal of Nonlinear Sciences and Numerical Simulation (Vol. 21, Issue 1, pp. 99–113). Walter de Gruyter GmbH. https://doi.org/10.1515/ijnsns-2019-0024

- The conclusion section presents very well. It summarized the research well.  

 

 

Author Response

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Author Response File: Author Response.pdf

Reviewer 4 Report

This paper studies the dynamic characteristics of the rotor system in pumped storage power station, and obtains the influence of the unbalanced magnetic pull on the natural frequency of the rotor system when the rotor has eccentricity. However, the reviewers believe that there were some mistakes in the content of the paper, which needed to be revised before publication. Detailed comments are presented below.

1. There seems to be mistakes in the author's affiliation. The authors are recommended to improve it.

2. Please revise the Chinese characters in Figure 1 of the manuscript.

3. The format of "rotor eccentricity distance" in section 2.2 should be in plural form.

4. The formats of Table 1, 2 and 3 in the manuscript are different. The author are recommended to refer to the journal manuscript template to modify the table.

5. Please explain the significance of the content in Section 3.1 for the numerical calculation of the rotating subsystem.

6.Errors are found in some words and units in the manuscript, for example, "1.5 x 109 N/m" in section 3.2, "n-m /r" in section 3.3, "otor eccentricity e of 5mm".

Author Response

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Author Response File: Author Response.pdf

Round 2

Reviewer 3 Report

I have read the revised paper and I can confirm that the authors revised the paper according to my major comments. 

One issue should be solved before publication: Please send the paper to English editing. 

Reviewer 4 Report

• The reviewer recommends acceptance