Abstract

PurposeThe tribological behavior, i.e. friction coefficient and wear rate, and vibration characteristics of the water-lubricated bearing was investigated. The water-lubricated bearing is made of three different materials, i.e. polyether-ether-ketone (PEEK), polyimide (PI) and nitrile-butadiene rubber (NBR).Design/methodology/approachThe tribological behavior was investigated experimentally on a specially designed test rig. Three vibration sensors were used to record the vibration of the bearing.FindingsThe results indicated that the variation of friction coefficient with rotation speed agrees well with the trend of Stribeck curve. The tested friction coefficient of rubber bearing is higher than that of the other two bearings whether it is in the state of mixed-lubrication or hydrodynamic lubrication, and which causing a larger wear rate in rubber bearing. The PEEK bearing exhibits the best tribological properties due to it has smaller friction coefficient and wear rate. However, it can be found that the rubber bearing gives the minimum vibration acceleration, which means that the rubber bearing has the most potential to improve the stability of water-lubricated bearing rotor system.Originality/valueIn this study, a group of experiment studies conducted on a specially designed test rig. The comprehensive performance, including friction coefficient, vibration acceleration and wear rate, of water-lubricated bearing with three different materials, i.e. PEEK, PI and NBR, was compared systematically. The experiment research may offer a reference for the selection of material in water-lubricated bearing in specific operating conditions.Peer reviewThe peer review history for this article is available at:


Authors

Han Yanfeng;  Yin Lei;  Xiang Guo;  Zhou Guangwu;  Chen Haizhou;  Zheng Xiaolin

Publons users who've claimed - I am an author
Contributors on Publons
  • 1 author
  • 1 reviewer
  • pre-publication peer review (FINAL ROUND)
    Decision Letter
    2020/04/04

    04-Apr-2020

    Dear Han, Yanfeng; Yin, Lei; Xiang, Guo; Zhou, Guangwu; Chen, Haizhou; Zheng, Xiaolin

    It is a pleasure to accept your manuscript ilt-10-2019-0447.R2, entitled "An Experimental Study on the Tribological Performance of Water-lubricated Journal Bearings with Three Different Materials" in its current form for publication in Industrial Lubrication and Tribology. Please note, no further changes can be made to your manuscript.

    Please go to your Author Centre at https://mc.manuscriptcentral.com/ilt (Manuscripts with Decisions for the submitting author or Manuscripts I have co-authored for all listed co-authors) to complete the Copyright Transfer Agreement form (CTA). We cannot publish your paper without this.

    All authors are requested to complete the form and to input their full contact details. If any of the contact information is incorrect you can update it by clicking on your name at the top right of the screen. Please note that this must be done prior to you submitting your CTA.

    If you have an ORCID please check your account details to ensure that your ORCID is validated.

    By publishing in this journal your work will benefit from Emerald EarlyCite. As soon as your CTA is completed your manuscript will pass to Emerald’s Content Management department and be processed for EarlyCite publication. EarlyCite is the author proofed, typeset version of record, fully citable by DOI. The EarlyCite article sits outside of a journal issue and is paginated in isolation. The EarlyCite article will be collated into a journal issue according to the journals’ publication schedule.

    FOR OPEN ACCESS AUTHORS: Please note if you have indicated that you would like to publish your article as Open Access via Emerald’s Gold Open Access route, you are required to complete a Creative Commons Attribution Licence - CCBY 4.0 (in place of the standard copyright assignment form referenced above). You will receive a follow up email within the next 30 days with a link to the CCBY licence and information regarding payment of the Article Processing Charge. If you have indicated that you might be eligible for a prepaid APC voucher, you will also be informed at this point if a voucher is available to you (for more information on APC vouchers please see http://www.emeraldpublishing.com/oapartnerships

    Thank you for your contribution. On behalf of the Editors of Industrial Lubrication and Tribology, we look forward to your continued contributions to the Journal.

    Sincerely,
    Prof. Carsten Gachot
    Editor, Industrial Lubrication and Tribology
    carsten.gachot@tuwien.ac.at

    Decision letter by
    Cite this decision letter
    Author Response
    2020/03/09

    Dear Editor:

    We would like to thank you again for the careful review of our manuscript and valuable suggestions. The error bars for all experimental results have been included. Changes in the manuscript are highlighted in the revised version for the convenience of your further review.

    Best regards,
    Yanfeng Han
    On behalf of all authors



    Cite this author response
  • pre-publication peer review (ROUND 2)
    Decision Letter
    2020/01/22

    22-Jan-2020

    Dear Asst. Prof. Zhou:

    Manuscript ID ilt-10-2019-0447.R1 entitled "An Experimental Study on the Tribological Performance of Water-lubricated Journal Bearings with Three Different Materials" which you submitted to the Industrial Lubrication and Tribology, has been reviewed. The comments of the reviewer(s) are included at the bottom of this letter.

    Editorial comments:

    Please include error bars for all experimental results to make your manuscript more solid.

    To revise your manuscript, log into https://mc.manuscriptcentral.com/ilt and enter your Author Centre, where you will find your manuscript title listed under "Manuscripts with Decisions." Under "Actions," click on "Create a Revision." Your manuscript number has been appended to denote a revision.

    You will be unable to make your revisions on the originally submitted version of the manuscript. Instead, revise your manuscript using a word processing program and save it on your computer. Please also highlight the changes to your manuscript within the document by using the track changes mode in MS Word or by using bold or coloured text.

    Once the revised manuscript is prepared, you can upload it and submit it through your Author Centre. The deadline for uploading a revised manuscript is 21-Apr-2020 from receiving this email. If it is not possible for you to resubmit your revision within this timeframe, we may have to consider your paper as a new submission.

    When submitting your revised manuscript, you will be able to respond to the comments made by the reviewer(s) in the space provided. You can use this space to document any changes you make to the original manuscript. In order to expedite the processing of the revised manuscript, please be as specific as possible in your response to the reviewer(s).

    IMPORTANT: Your original files are available to you when you upload your revised manuscript. Please delete any redundant files before completing the submission.

    Please note that Emerald requires you to clear permission to re-use any material not created by you. If there are permissions outstanding, please send these to Emerald as soon as possible. Emerald is unable to publish your paper with permissions outstanding.

    Once again, thank you for submitting your manuscript to the Industrial Lubrication and Tribology and I look forward to receiving your revision.

    Sincerely,
    Prof. Carsten Gachot
    Editor, Industrial Lubrication and Tribology
    carsten.gachot@tuwien.ac.at

    Reviewer(s)' Comments to Author:
    Reviewer: 1

    Comments to the Author
    The authors have answered my questions and revised the manuscript carefully, I think this manuscript can be accepted for publication now.
    Reviewer: 1

    Recommendation: Accept

    Comments:
    The authors have answered my questions and revised the manuscript carefully, I think this manuscript can be accepted for publication now.

    Additional Questions:
    Originality: Does the paper contain new and significant information adequate to justify publication?: Yes.

    Relationship to Literature: Does the paper demonstrate an adequate understanding of the relevant literature in the field and cite an appropriate range of literature sources? Is any signficant work ignored?: Yes.

    Methodology: Is the paper's argument built on an appropriate base of theory, concepts, or other ideas? Has the research or equivalent intellectual work on which the paper is based been well designed? Are the methods employed appropriate?: Yes.

    Results: Are results presented clearly and analysed appropriately? Do the conclusions adequately tie together the other elements of the paper?: Yes.

    Practicality and/or Research implications: Does the paper identify clearly any implications for practice and/or further research? Are these implications consistent withthe findings and conclusions of the paper?: Yes.

    Quality of Communication: Does the paper clearly express its case, measured against the technical language of the field and the expected knowledge of the journal's readership? Has attention been paid to the clarity of expression and readability, such as sentence structure, jargon use, acronyms, etc.: Yes.

    Reproducible Research: If appropriate, is sufficient information, potentially including data and software, provided to reproduce the results and are the corresponding datasets formally cited?:

    This journal is participating in Publons Transparent Peer Review. By reviewing for this journal, you agree that your finished report, along with the author’s responses and the Editor’s decision letter, will be linked to from the published article to where they appear on Publons, if the paper is accepted. If you have any concerns about participating in the Transparent Peer Review pilot, please reach out to the journal’s Editorial office. Please indicate below, whether you would like your name to appear with your report on Publons by indicating yes or no: No, I would not like my name to appear with my report on Publons

    Decision letter by
    Cite this decision letter
    Reviewer report
    2020/01/06

    The authors have answered my questions and revised the manuscript carefully, I think this manuscript can be accepted for publication now.

    Reviewed by
    Cite this review
    Author Response
    2019/12/25

    Manuscript ilt-10-2019-0447

    December 25, 2019
    Dear Editor:
    We would like to thank you and the reviewers again for the careful review of our manuscript and valuable suggestions. Following is a list of the modifications we made and reply to the questions raised by the reviewers. Changes in the manuscript are highlighted in the revised version for the convenience of your further review.

    Reviewers' comments:
    Reviewer: 1

    Comments to the Author,
    This paper was focused on analyzing the friction coefficient, wear rate, and vibration characteristic of the three different materials water-lubricated bearings at different speeds and loads by experimental methods. It provides an important reference for the engineering application of these materials. However, some improvements are advised to make the manuscript better.
    1) Page 3 line 26: is strongly depends on→strongly depends on; condition→conditions; line 40,54, etc. : condition→conditions.
    Author’s reply: The modification has been made as your suggestion.

    2) Page 3 line 47: significantly effect→significant effect.
    Author’s reply: The modification has been made as your suggestion.

    3) Page 3 line 54, Page 4 line 12, etc. : water lubricated→water-lubricated.
    Author’s reply: The modification has been made as your suggestion.

    4) Page 3 line 55: slow speed sliding→low sliding speed
    Author’s reply: The modification has been made as your suggestion.

    5) Page 4 line 9: on tribological performance→on the tribological performance
    Author’s reply: The modification has been made as your suggestion.

    6) Page 4 line 14: experiment studies→experimental studies; line 17: water lubricated bearing…was compared…→water-lubricated bearing…were compared…; line 19: experiment research→experimental research
    Author’s reply: The modification has been made as your suggestion.

    7) Page 6 line 12: of water tank→of the water tank; line 14: is set to→are set to
    Author’s reply: The modification has been made as your suggestion.

    8) Page 6 line 21: are same as→are the same as; Page 6 line 24: All of test bearing→All of the test bearings. line 26: and then them were→and then they were; line 24: were conduct to→were conducted to
    Author’s reply: The modification has been made as your suggestion.

    9) Page 4 line 37, line 41, Page 6 line 27 etc. : with accuracy of→with an accuracy of
    Author’s reply: The modification has been made as your suggestion.

    10) Page 6 line 47: The Figure 4 shows→Figure 4 shows; line 50: of Stribeck curve→of the Stribeck curve; line 57: the speed reach to→the speed reaches to
    Author’s reply: The modification has been made as your suggestion.

    11) Page 8 lines 5-11 etc. : low frequency region, middle frequency region and high frequency region→low-frequency region, middle-frequency region and high-frequency region
    Author’s reply: The modification has been made as your suggestion.

    12) Page 8 line 19: the main frequencies is around→the main frequencies are around
    Author’s reply: The modification has been made as your suggestion.

    13) Page 8 line 19: This sentence has two predicate verbs. which is approximately equals to →which approximately equal to
    Author’s reply: The modification has been made as your suggestion.

    14) Page 8 line 26: has higher acceleration amplitude value→has some higher acceleration amplitude values
    Author’s reply: The modification has been made as your suggestion.

    15) Page 8 line 39: in time domain→in the time domain
    Author’s reply: The modification has been made as your suggestion.

    16) Page 9 line 42: Mixed-EHL and EHL regime→Mixed-EHL and EHL regimes
    Author’s reply: The modification has been made as your suggestion.

    17) Page 9 line 44: gives the maximum wear rate compare to→gives the maximum wear rate compared to.
    Author’s reply: The modification has been made as your suggestion.

    18) Page 10 line 26: A series of experimental study→A series of experimental studies
    Author’s reply: The modification has been made as your suggestion.

    19) Page 10 line 34: characteristic→characteristics
    Author’s reply: The modification has been made as your suggestion.

    20) Page 10 line 42: has the lower acceleration amplitude→has a lower acceleration amplitude
    Author’s reply: The modification has been made as your suggestion.

    Special thanks to you for your good comments!

    Reviewer: 2

    Comments to the Author
    The authors performed an experiment to compare the tribological and dynamic performances of water-lubricated bearing with three different materials. This study can help the bearing designers to choose the water-lubricated materials under various industrial applications. I think this paper is suitable for publication in the journal “Industrial Lubrication and Tribology” after the following items being revised or explained:
    (1) The groove may affect the tribological and dynamic performances, please provide the dimension details of the groove.
    Author’s reply: The dimension details of the groove have been added in Table 1.

    (2) During the tests, is there a transverse load applied on the tested bearing? Please clarify.
    Author’s reply: In wear experiment, the test force is 200N applied in the vertical direction. Which has been added in the revised manuscript. See part 2.3.1.

    (3) Please add the material parameters, including the elastic modulus, Poisson's ratio, and hardness.
    Author’s reply: The elastic modulus, Poisson's ratio and hardness of PEEK, PI and NBR have been added in Table 2.

    (4) In Fig. 4, please explain the observation that the friction coefficient slightly increases with the furthering rotation speed.
    Author’s reply: According to the τ=μdu/dz, the friction coefficient will be increased with the increase of speed.

    (5) In section 3.2, what is meaning of “Figure. 5(a) illustrates the evaluations of acceleration versus time.”? Should it be “evolutions” instead of “evaluations”?
    Author’s reply: The modification has been made as your suggestion.

    (6) In the vibration experiments, the rubber seems to be the optimal choice for reducing the vibration. Please clarify the vibration reduction of water-lubricated rubber bearing.
    Author’s reply: Thanks for this comment, the explanation related to the vibration reduction of water-lubricated rubber bearing has been added in the revised manuscript, which can be found in section 3.2.

    (7) In Fig. 8(b), the tested bearings are operating in the hydrodynamic lubrication regime with a rotation speed of 5000 rpm. If there is no direct contact in this lubrication regime, wear should not occur. Please check and explain.
    Author’s reply: Actually, according to the experimental observation, even if the rotational speed reaches 5000rpm, the asperity contact is inevitable due to the vibration, which has been clarified in the revised version. Therefore, the slight wear loss still occurs when the rotational speed is 5000rpm, which has been captured by the analytical balance.

    (8) The conclusion #2 should be more clearly described.
    Author’s reply: Thanks for your comment, the conclusion #2 has been modified in the revised manuscript.



    Cite this author response
  • pre-publication peer review (ROUND 1)
    Decision Letter
    2019/11/11

    11-Nov-2019

    Dear Asst. Prof. Zhou:

    Manuscript ID ilt-10-2019-0447 entitled "An Experimental Study on the Tribological Performance of Water-lubricated Journal Bearings with Three Different Materials" which you submitted to the Industrial Lubrication and Tribology, has been reviewed. The comments of the reviewer(s) are included at the bottom of this letter.

    The reviewer(s) have recommended major revisions to the submitted manuscript, before it can be considered for publication. Therefore, I invite you to respond to the reviewer(s)' comments and revise your manuscript.

    To revise your manuscript, log into https://mc.manuscriptcentral.com/ilt and enter your Author Centre, where you will find your manuscript title listed under "Manuscripts with Decisions." Under "Actions," click on "Create a Revision." Your manuscript number has been appended to denote a revision.

    You will be unable to make your revisions on the originally submitted version of the manuscript. Instead, revise your manuscript using a word processing program and save it on your computer. Please also highlight the changes to your manuscript within the document by using the track changes mode in MS Word or by using bold or coloured text.

    Once the revised manuscript is prepared, you can upload it and submit it through your Author Centre. The deadline for uploading a revised manuscript is 09-Feb-2020 from receiving this email. If it is not possible for you to resubmit your revision within this timeframe, we may have to consider your paper as a new submission.

    When submitting your revised manuscript, you will be able to respond to the comments made by the reviewer(s) in the space provided. You can use this space to document any changes you make to the original manuscript. In order to expedite the processing of the revised manuscript, please be as specific as possible in your response to the reviewer(s).

    IMPORTANT: Your original files are available to you when you upload your revised manuscript. Please delete any redundant files before completing the submission.

    Please note that Emerald requires you to clear permission to re-use any material not created by you. If there are permissions outstanding, please send these to Emerald as soon as possible. Emerald is unable to publish your paper with permissions outstanding.

    Once again, thank you for submitting your manuscript to the Industrial Lubrication and Tribology and I look forward to receiving your revision.

    Sincerely,
    Prof. Carsten Gachot
    Editor, Industrial Lubrication and Tribology
    carsten.gachot@tuwien.ac.at

    Reviewer(s)' Comments to Author:
    Reviewer: 1

    Comments to the Author
    Comments to the Author,
    This paper was focused on analyzing the friction coefficient, wear rate, and vibration characteristic of the three different materials water-lubricated bearings at different speeds and loads by experimental methods. It provides an important reference for the engineering application of these materials. However, some improvements are advised to make the manuscript better.
    1) Page 3 line 26: is strongly depends on→strongly depends on; condition→conditions; line 40,54, etc. : condition→conditions.
    2) Page 3 line 47: significantly effect→significant effect.
    3) Page 3 line 54, Page 4 line 12, etc. : water lubricated→water-lubricated.
    4) Page 3 line 55: slow speed sliding→low sliding speed
    5) Page 4 line 9: on tribological performance→on the tribological performance
    6) Page 4 line 14: experiment studies→experimental studies; line 17: water lubricated bearing…was compared…→water-lubricated bearing…were compared…; line 19: experiment research→experimental research
    7) Page 6 line 12: of water tank→of the water tank; line 14: is set to→are set to
    8) Page 6 line 21: are same as→are the same as; Page 6 line 24: All of test bearing→All of the test bearings. line 26: and then them were→and then they were; line 24: were conduct to→were conducted to
    9) Page 4 line 37, line 41, Page 6 line 27 etc. : with accuracy of→with an accuracy of
    10) Page 6 line 47: The Figure 4 shows→Figure 4 shows; line 50: of Stribeck curve→of the Stribeck curve; line 57: the speed reach to→the speed reaches to
    11) Page 8 lines 5-11 etc. : low frequency region, middle frequency region and high frequency region→low-frequency region, middle-frequency region and high-frequency region
    12) Page 8 line 19: the main frequencies is around→the main frequencies are around
    13) Page 8 line 19: This sentence has two predicate verbs. which is approximately equals to →which approximately equal to
    14) Page 8 line 26: has higher acceleration amplitude value→has some higher acceleration amplitude values
    15) Page 8 line 39: in time domain→in the time domain
    16) Page 9 line 42: Mixed-EHL and EHL regime→Mixed-EHL and EHL regimes
    17) Page 9 line 44: gives the maximum wear rate compare to→gives the maximum wear rate compared to.
    18) Page 10 line 26: A series of experimental study→A series of experimental studies
    19) Page 10 line 34: characteristic→characteristics
    20) Page 10 line 42: has the lower acceleration amplitude→has a lower acceleration amplitude

    Reviewer: 2

    Comments to the Author
    The authors performed an experiment to compare the tribological and dynamic performances of water-lubricated bearing with three different materials. This study can help the bearing designers to choose the water-lubricated materials under various industrial applications. I think this paper is suitable for publication in the journal “Industrial Lubrication and Tribology” after the following items being revised or explained:
    (1) The groove may affect the tribological and dynamic performances, please provide the dimension details of the groove.
    (2) During the tests, is there a transverse load applied on the tested bearing? Please clarify.
    (3) Please add the material parameters, including the elastic modulus, Poisson's ratio, and hardness.
    (4) In Fig. 4, please explain the observation that the friction coefficient slightly increases with the furthering rotation speed.
    (5) In section 3.2, what is meaning of “Figure. 5(a) illustrates the evaluations of acceleration versus time.”? Should it be “evolutions” instead of “evaluations”?
    (6) In the vibration experiments, the rubber seems to be the optimal choice for reducing the vibration. Please clarify the vibration reduction of water-lubricated rubber bearing.
    (7) In Fig. 8(b), the tested bearings are operating in the hydrodynamic lubrication regime with a rotation speed of 5000 rpm. If there is no direct contact in this lubrication regime, wear should not occur. Please check and explain.
    (8) The conclusion #2 should be more clearly described.
    Reviewer: 1

    Recommendation: Minor Revision

    Comments:
    Comments to the Author,
    This paper was focused on analyzing the friction coefficient, wear rate, and vibration characteristic of the three different materials water-lubricated bearings at different speeds and loads by experimental methods. It provides an important reference for the engineering application of these materials. However, some improvements are advised to make the manuscript better.
    1) Page 3 line 26: is strongly depends on→strongly depends on; condition→conditions; line 40,54, etc. : condition→conditions.
    2) Page 3 line 47: significantly effect→significant effect.
    3) Page 3 line 54, Page 4 line 12, etc. : water lubricated→water-lubricated.
    4) Page 3 line 55: slow speed sliding→low sliding speed
    5) Page 4 line 9: on tribological performance→on the tribological performance
    6) Page 4 line 14: experiment studies→experimental studies; line 17: water lubricated bearing…was compared…→water-lubricated bearing…were compared…; line 19: experiment research→experimental research
    7) Page 6 line 12: of water tank→of the water tank; line 14: is set to→are set to
    8) Page 6 line 21: are same as→are the same as; Page 6 line 24: All of test bearing→All of the test bearings. line 26: and then them were→and then they were; line 24: were conduct to→were conducted to
    9) Page 4 line 37, line 41, Page 6 line 27 etc. : with accuracy of→with an accuracy of
    10) Page 6 line 47: The Figure 4 shows→Figure 4 shows; line 50: of Stribeck curve→of the Stribeck curve; line 57: the speed reach to→the speed reaches to
    11) Page 8 lines 5-11 etc. : low frequency region, middle frequency region and high frequency region→low-frequency region, middle-frequency region and high-frequency region
    12) Page 8 line 19: the main frequencies is around→the main frequencies are around
    13) Page 8 line 19: This sentence has two predicate verbs. which is approximately equals to →which approximately equal to
    14) Page 8 line 26: has higher acceleration amplitude value→has some higher acceleration amplitude values
    15) Page 8 line 39: in time domain→in the time domain
    16) Page 9 line 42: Mixed-EHL and EHL regime→Mixed-EHL and EHL regimes
    17) Page 9 line 44: gives the maximum wear rate compare to→gives the maximum wear rate compared to.
    18) Page 10 line 26: A series of experimental study→A series of experimental studies
    19) Page 10 line 34: characteristic→characteristics
    20) Page 10 line 42: has the lower acceleration amplitude→has a lower acceleration amplitude

    Additional Questions:
    Originality: Does the paper contain new and significant information adequate to justify publication?: Yes

    Relationship to Literature: Does the paper demonstrate an adequate understanding of the relevant literature in the field and cite an appropriate range of literature sources? Is any signficant work ignored?: Yes

    Methodology: Is the paper's argument built on an appropriate base of theory, concepts, or other ideas? Has the research or equivalent intellectual work on which the paper is based been well designed? Are the methods employed appropriate?: Yes

    Results: Are results presented clearly and analysed appropriately? Do the conclusions adequately tie together the other elements of the paper?: Yes

    Practicality and/or Research implications: Does the paper identify clearly any implications for practice and/or further research? Are these implications consistent withthe findings and conclusions of the paper?: Yes

    Quality of Communication: Does the paper clearly express its case, measured against the technical language of the field and the expected knowledge of the journal's readership? Has attention been paid to the clarity of expression and readability, such as sentence structure, jargon use, acronyms, etc.: Yes

    Reproducible Research: If appropriate, is sufficient information, potentially including data and software, provided to reproduce the results and are the corresponding datasets formally cited?:

    This journal is participating in Publons Transparent Peer Review. By reviewing for this journal, you agree that your finished report, along with the author’s responses and the Editor’s decision letter, will be linked to from the published article to where they appear on Publons, if the paper is accepted. If you have any concerns about participating in the Transparent Peer Review pilot, please reach out to the journal’s Editorial office. Please indicate below, whether you would like your name to appear with your report on Publons by indicating yes or no: No, I would not like my name to appear with my report on Publons

    Reviewer: 2

    Recommendation: Major Revision

    Comments:
    The authors performed an experiment to compare the tribological and dynamic performances of water-lubricated bearing with three different materials. This study can help the bearing designers to choose the water-lubricated materials under various industrial applications. I think this paper is suitable for publication in the journal “Industrial Lubrication and Tribology” after the following items being revised or explained:
    (1) The groove may affect the tribological and dynamic performances, please provide the dimension details of the groove.
    (2) During the tests, is there a transverse load applied on the tested bearing? Please clarify.
    (3) Please add the material parameters, including the elastic modulus, Poisson's ratio, and hardness.
    (4) In Fig. 4, please explain the observation that the friction coefficient slightly increases with the furthering rotation speed.
    (5) In section 3.2, what is meaning of “Figure. 5(a) illustrates the evaluations of acceleration versus time.”? Should it be “evolutions” instead of “evaluations”?
    (6) In the vibration experiments, the rubber seems to be the optimal choice for reducing the vibration. Please clarify the vibration reduction of water-lubricated rubber bearing.
    (7) In Fig. 8(b), the tested bearings are operating in the hydrodynamic lubrication regime with a rotation speed of 5000 rpm. If there is no direct contact in this lubrication regime, wear should not occur. Please check and explain.
    (8) The conclusion #2 should be more clearly described.

    Additional Questions:
    Originality: Does the paper contain new and significant information adequate to justify publication?: Yes.

    Relationship to Literature: Does the paper demonstrate an adequate understanding of the relevant literature in the field and cite an appropriate range of literature sources? Is any signficant work ignored?: I think the citations are good.

    Methodology: Is the paper's argument built on an appropriate base of theory, concepts, or other ideas? Has the research or equivalent intellectual work on which the paper is based been well designed? Are the methods employed appropriate?: The paper is built on the appropriate base of theory, the work is well designed, and the methods are employed appropriate.

    Results: Are results presented clearly and analysed appropriately? Do the conclusions adequately tie together the other elements of the paper?: Yes, the results and conclusions are appropriate.

    Practicality and/or Research implications: Does the paper identify clearly any implications for practice and/or further research? Are these implications consistent withthe findings and conclusions of the paper?: Yes, this paper identifies the practice of the research on the water-lubricated journal bearing, and the implications are consistent with the findings and conclusions of the paper.

    Quality of Communication: Does the paper clearly express its case, measured against the technical language of the field and the expected knowledge of the journal's readership? Has attention been paid to the clarity of expression and readability, such as sentence structure, jargon use, acronyms, etc.: Yes.

    Reproducible Research: If appropriate, is sufficient information, potentially including data and software, provided to reproduce the results and are the corresponding datasets formally cited?: Yes.

    This journal is participating in Publons Transparent Peer Review. By reviewing for this journal, you agree that your finished report, along with the author’s responses and the Editor’s decision letter, will be linked to from the published article to where they appear on Publons, if the paper is accepted. If you have any concerns about participating in the Transparent Peer Review pilot, please reach out to the journal’s Editorial office. Please indicate below, whether you would like your name to appear with your report on Publons by indicating yes or no: No, I would not like my name to appear with my report on Publons

    Decision letter by
    Cite this decision letter
    Reviewer report
    2019/11/11

    The authors performed an experiment to compare the tribological and dynamic performances of water-lubricated bearing with three different materials. This study can help the bearing designers to choose the water-lubricated materials under various industrial applications. I think this paper is suitable for publication in the journal “Industrial Lubrication and Tribology” after the following items being revised or explained:
    (1) The groove may affect the tribological and dynamic performances, please provide the dimension details of the groove.
    (2) During the tests, is there a transverse load applied on the tested bearing? Please clarify.
    (3) Please add the material parameters, including the elastic modulus, Poisson's ratio, and hardness.
    (4) In Fig. 4, please explain the observation that the friction coefficient slightly increases with the furthering rotation speed.
    (5) In section 3.2, what is meaning of “Figure. 5(a) illustrates the evaluations of acceleration versus time.”? Should it be “evolutions” instead of “evaluations”?
    (6) In the vibration experiments, the rubber seems to be the optimal choice for reducing the vibration. Please clarify the vibration reduction of water-lubricated rubber bearing.
    (7) In Fig. 8(b), the tested bearings are operating in the hydrodynamic lubrication regime with a rotation speed of 5000 rpm. If there is no direct contact in this lubrication regime, wear should not occur. Please check and explain.
    (8) The conclusion #2 should be more clearly described.

    Reviewed by
    Cite this review
    Reviewer report
    2019/11/07

    Comments to the Author,
    This paper was focused on analyzing the friction coefficient, wear rate, and vibration characteristic of the three different materials water-lubricated bearings at different speeds and loads by experimental methods. It provides an important reference for the engineering application of these materials. However, some improvements are advised to make the manuscript better.
    1) Page 3 line 26: is strongly depends on→strongly depends on; condition→conditions; line 40,54, etc. : condition→conditions.
    2) Page 3 line 47: significantly effect→significant effect.
    3) Page 3 line 54, Page 4 line 12, etc. : water lubricated→water-lubricated.
    4) Page 3 line 55: slow speed sliding→low sliding speed
    5) Page 4 line 9: on tribological performance→on the tribological performance
    6) Page 4 line 14: experiment studies→experimental studies; line 17: water lubricated bearing…was compared…→water-lubricated bearing…were compared…; line 19: experiment research→experimental research
    7) Page 6 line 12: of water tank→of the water tank; line 14: is set to→are set to
    8) Page 6 line 21: are same as→are the same as; Page 6 line 24: All of test bearing→All of the test bearings. line 26: and then them were→and then they were; line 24: were conduct to→were conducted to
    9) Page 4 line 37, line 41, Page 6 line 27 etc. : with accuracy of→with an accuracy of
    10) Page 6 line 47: The Figure 4 shows→Figure 4 shows; line 50: of Stribeck curve→of the Stribeck curve; line 57: the speed reach to→the speed reaches to
    11) Page 8 lines 5-11 etc. : low frequency region, middle frequency region and high frequency region→low-frequency region, middle-frequency region and high-frequency region
    12) Page 8 line 19: the main frequencies is around→the main frequencies are around
    13) Page 8 line 19: This sentence has two predicate verbs. which is approximately equals to →which approximately equal to
    14) Page 8 line 26: has higher acceleration amplitude value→has some higher acceleration amplitude values
    15) Page 8 line 39: in time domain→in the time domain
    16) Page 9 line 42: Mixed-EHL and EHL regime→Mixed-EHL and EHL regimes
    17) Page 9 line 44: gives the maximum wear rate compare to→gives the maximum wear rate compared to.
    18) Page 10 line 26: A series of experimental study→A series of experimental studies
    19) Page 10 line 34: characteristic→characteristics
    20) Page 10 line 42: has the lower acceleration amplitude→has a lower acceleration amplitude

    Reviewed by
    Cite this review
All peer review content displayed here is covered by a Creative Commons CC BY 4.0 license.