A Numerical Investigation of the Effects of Groove Texture on the Dynamics of a Water-Lubricated Bearing–Rotor System
Round 1
Reviewer 1 Report
The authors present a dynamic analysis as a continuation on their investigations on a textured journal bearing. The paper is well written but needs some improvements to provide clarity for the reader.
Chapter 2.3.1: Why do the authors use a fourth order Runge-Kutta method while eq. 12 can be solved analytically? Moreover, please define the dimensionless critical mass as it is a central parameter of your analysis.
Chapter 2.4: Please consider to revise the expression “is unsuitable anymore“. Maybe “is not/no longer suitable“?!
Chapter 3: Please consider to revise the expression “correction“. “Correctness” seems to be more suitable?! Additionally, the corresponding sentence is very long.
Chapter 3: To my best understanding, Figure 5 features a comparison of simulation results. Therefore, the dynamic simulation procedure is only verified with the data from Ref. [23] as no measurement data for validation is available. Please clarify. Moreover, Figure 5 should be revised to improve readability. Maybe a split into two Figures for 15000 rpm and 30000 rpm is meaningful. The expression “validated” in the last paragraph should be substituted by “verified”.
Chapter 3: The groove length and the bearing length are the same in Table 1. Is that correct? Moreover, the angular span of the textured region is missing.
Chapter 4: “As shown in Figure 7, the groove…”
Chapter 4: The readability of Figure 8-11 is quite poor due to numerous lines in one Figure. Every measure to improve this issue is welcome.
Chapter 4.1.1: “Figure 8 shows”
Chapter 4.1.1: The authors state: “The reason for this is probably that the presence of groove texture can produce several small convergence regions, leading to changes of the cavitation area and distribution of pressure. “ Why do the authors not try to prove such a statement with their detailed local results? Please try to avoid speculate statements.
Chapter 4.1.2: What do the authors mean with an improved stiffness/damping? Do you think a higher value is always an improvement?
Chapter 4.1.2: How do the authors explain the great differences between Cyx and Cxy as classical analyses based on Reynolds equation more or less lead to similar values for both coefficients?
Chapter 4.1.3: “at a rotary speed of 20000 rpm”
Chapter 4.3.2: Some statements included in the text cannot be observed clearly in Figure 19. Please clearly define if you provide information that is not visible in the Figures. For me it is quite confusing if you talk about “lower rotary speeds”. Do you mean the 15000 rpm or something like 5000 rpm? What is a large eccentricity ratio? 0.6? Please clarify.
Author Response
Please see the attachment. Thank you!
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Journal: Lubricants (ISSN 2075-4442)
Manuscript ID: lubricants-2386321
Review Report#
The authors presented an article on “A Numerical Investigation of the Effects of Groove Texture on the Dynamics of a Water-Lubricated Bearing-Rotor System”. The subject of the article falls within the scope of the journal "Lubricants". The work is well organized. However, the article will be ready for publication after a major revision. Comments are listed below. (The similarity rate is 17%.).
1. Numerical results can be given in the summary section.
2. In the introduction, hydrodynamic bearings and their usage areas are not mentioned. It should be explained.
3. In the introduction, references on hydrodynamic bearings and numerical studies are insufficient. Current references should be included.
4. Is the novelty in this work just a comprehensive numerical analysis?
5. The results are sorted like a technical paper. It should be discussed and compared with the studies in the literature.
6. The article contains numerous typographic and language errors. It should be corrected.
7. The article should be rearranged by taking into account the journal writing rules and citation rules.
Author Response
Please see the attachment. Thank you!
Author Response File: Author Response.pdf
Reviewer 3 Report
The paper investigated the bahviour of journal bearing under water lubrication. The quality of paper is quite good. The reviewer has some questions according to the content of paper. Please see in the attached file
Comments for author File: Comments.pdf
Author Response
Please see the attachment. Thank you!
Author Response File: Author Response.pdf
Round 2
Reviewer 2 Report
Journal: Lubricants (ISSN 2075-4442)
Manuscript ID: lubricants-2386321
Review Report#2
The authors completed the requested revisions. In my opinion, this article can be accepted for publication in the "Lubricants" journal in its final form.
