Abstract

PurposeAs an important part of the rotor system, the damping coefficient of ball bearing has a great influence on the dynamic characteristics of the system. This study aims to propose a theoretical calculation method and an experimental test method to obtain the damping coefficient of ball bearing.Design/methodology/approachBased on Hertzian contact theory and elastohydrodynamic lubrication theory, the point contact oil film damping analysis model of ball bearing is established. The comprehensive damping calculation method considering external radial load, centrifugal force, ball spin, rotational speed and lubricating oil film is derived. The multigrid method is used to obtain the oil film pressure and thickness distribution in the contact zone. The variation trend of comprehensive damping with bearing radial load, rotational speed, oil film thickness and viscosity is analyzed. The test platform is designed and the influencing factors of damping are tested.FindingsThe validity of the model and reliability of the test device are verified by comparing the good consistency obtained in the work. The results show that the comprehensive damping of ball bearing increases with the increase of radial load and decreases with the increase of rotational speed.Originality/valueAt present, the existing bearing damping model can achieve approximate calculation of damping, but the factors considered in these models are not comprehensive enough. Besides, few studies exist regarding test platform of bearing damping, and a perfect test plan has not yet been formed. In this paper, the comprehensive damping calculation model of ball bearing is improved, and a complete experimental scheme is proposed to provide reference for the comprehensive damping theory and experimental research of bearing.Peer reviewThe peer review history for this article is available at:


Authors

Sun, Peng;  Chen, Weifang;  Shen, Yusu;  Wang, Dan

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  • 1 reviewer
  • pre-publication peer review (FINAL ROUND)
    Decision Letter
    2020/03/13

    13-Mar-2020

    Dear Sun, Peng; Chen, Weifang; Shen, Yusu; Wang, Dan

    It is a pleasure to accept your manuscript ilt-08-2019-0342.R4, entitled "Calculation Method for Comprehensive Damping of Ball Bearings based on Multigrid Method" in its current form for publication in Industrial Lubrication and Tribology. Please note, no further changes can be made to your manuscript.

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    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
    2020/03/13

    Dear Prof. Carsten Gachot:

    Sorry for disturbing you. I'm not sure if it is the right time to contact you. On behalf of my co-authors, we thank you very much for giving us an opportunity to revise our manu, we appreciate editor and reviewers very much for their positive and constructive comments and suggestions on our manu entitled “Calculation method for comprehensive damping of ball bearings based on multigrid method”. (ID:ilt-08-2019-0342.R3).
    We have studied reviewer’s comments carefully and have made revision which marked in red in the paper. Specific revisions include:
    (1) The number of figures have been reduced to 9 by grouping them together with (a), (b);
    (2) Add an explanation for the oil film thickness to Figure 3(b).
    We have tried our best to revise our manu according to the comments. Attached please find the revised version, which is basically in accordance with the format requirements of the Journal of Industrial Lubrication and Tribology, and we would like to submit for your kind consideration.
    I would appreciate it if you could expedite my revision, thank you. We would like to express our great appreciation to you and reviewers for comments on our paper. Looking forward to hearing from you.
    Thank you and best regards.

    Yours sincerely,
    Peng Sun
    Corresponding author:
    Name: Weifang Chen
    E-mail: meewfchen@nuaa.edu.edu.cn



    Cite this author response
  • pre-publication peer review (ROUND 4)
    Reviewer report
    2020/03/13

    • The number of figures still must be reduced. This can be easily done by grouping them together and work with a), b) and so on...

    Reviewed by
    Cite this review
    Decision Letter
    2020/03/12

    12-Mar-2020

    Dear Mr. Sun:

    Manuscript ID ilt-08-2019-0342.R3 entitled "Calculation Method for Comprehensive Damping of Ball Bearings based on Multigrid Method" 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 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 11-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 number of figures still must be reduced. This can be easily done by grouping them together and work with a), b) and so on...
    Reviewer: 1

    Recommendation: Minor Revision

    Comments:
    - The number of figures still must be reduced. This can be easily done by grouping them together and work with a), b) and so on...

    Additional Questions:
    Originality: Does the paper contain new and significant information adequate to justify publication?: Please see comments below.

    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?: Please see comments below.

    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?: Please see comments below.

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

    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?: Please see comments below.

    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.: Please see comments below.

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

    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
    Author Response
    2020/03/09

    Dear Prof. Carsten Gachot:

    Sorry for disturbing you. I'm not sure if it is the right time to contact you. On behalf of my co-authors, we thank you very much for giving us an opportunity to revise our manu, we appreciate editor and reviewers very much for their positive and constructive comments and suggestions on our manu entitled “Calculation method for comprehensive damping of ball bearings based on multigrid method”. (ID:ilt-08-2019-0342.R2).
    We have studied reviewer’s comments carefully and have made revision which marked in red in the paper. Specific revisions include:
    (1) The format of the references is revised;
    (2) The number of figures in manuscript have been reduced to 12;
    (3) Add some parameters missing from the Nomenclature;
    (4) Add the references of film thickness, viscosity and density equations required in page 3 and page 4;
    (5) The format of the full text have been revised.
    We have tried our best to revise our manu according to the comments. Attached please find the revised version, which is basically in accordance with the format requirements of the Journal of Industrial Lubrication and Tribology, and we would like to submit for your kind consideration.
    In addition, since I am about to graduate in early April, I would appreciate it if you could expedite my revision, thank you. We would like to express our great appreciation to you and reviewers for comments on our paper. Looking forward to hearing from you.
    Thank you and best regards.

    Yours sincerely,
    Peng Sun
    Corresponding author:
    Name: Weifang Chen
    E-mail: meewfchen@nuaa.edu.edu.cn



    Cite this author response
  • pre-publication peer review (ROUND 3)
    Decision Letter
    2020/03/04

    04-Mar-2020

    Dear Mr. Sun:

    Manuscript ID ilt-08-2019-0342.R2 entitled "Calculation Method for Comprehensive Damping of Ball Bearings based on Multigrid Method" 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:

    • The format of the references is not correct.

    • The manuscript largely exceeds the maximum number of figures. Please reduce them accordingly.

    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 02-Jun-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
    Some minor modifications are required in the paper before publication. Some suggestions regarding minor modifications are:

    1. Some of the parameters are missing from the Nomenclature. Have a detailed look into the nomenclature section.
    2. Grammatically correct the line 54, 55 and 56 in page 2.
    3. References of film thickness, viscosity and density equations are required in page 3 and page 4.
    4. Word "th" in "k+1 th" and "k th" should be in superscript.
    5. In Figure 4, name the variables and its initial values whose initial values are set instead of " Input some initial values....".
    6. Since no thermal effect has been studied (energy equation/ temperature distribution equation in the contact area has not been included), remove the word "thermal effect" from line 59 in page 13 (Conclusion section).
    7. It is recommended to check the reference list for proper citation, and use DOI if possible.
      Reviewer: 1

    Recommendation: Accept

    Comments:
    Some minor modifications are required in the paper before publication. Some suggestions regarding minor modifications are:

    1. Some of the parameters are missing from the Nomenclature. Have a detailed look into the nomenclature section.
    2. Grammatically correct the line 54, 55 and 56 in page 2.
    3. References of film thickness, viscosity and density equations are required in page 3 and page 4.
    4. Word "th" in "k+1 th" and "k th" should be in superscript.
    5. In Figure 4, name the variables and its initial values whose initial values are set instead of " Input some initial values....".
    6. Since no thermal effect has been studied (energy equation/ temperature distribution equation in the contact area has not been included), remove the word "thermal effect" from line 59 in page 13 (Conclusion section).
    7. It is recommended to check the reference list for proper citation, and use DOI if possible.

    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?: An appropriate amount of literature has been cited in the introduction section to demonstrate the work carried out in the paper.

    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 methods employed in the paper are appropriate, and the paper is well designed.

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

    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?: The results presented in the paper are of practical use and can lead to further research in the said field. The findings are consistent.

    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
    2020/03/04

    Some minor modifications are required in the paper before publication. Some suggestions regarding minor modifications are:

    1. Some of the parameters are missing from the Nomenclature. Have a detailed look into the nomenclature section.
    2. Grammatically correct the line 54, 55 and 56 in page 2.
    3. References of film thickness, viscosity and density equations are required in page 3 and page 4.
    4. Word "th" in "k+1 th" and "k th" should be in superscript.
    5. In Figure 4, name the variables and its initial values whose initial values are set instead of " Input some initial values....".
    6. Since no thermal effect has been studied (energy equation/ temperature distribution equation in the contact area has not been included), remove the word "thermal effect" from line 59 in page 13 (Conclusion section).
    7. It is recommended to check the reference list for proper citation, and use DOI if possible.

    Reviewed by
    Cite this review
    Author Response
    2020/02/19

    Dear Prof. Carsten Gachot:
    On behalf of my co- authors, we thank you very much for giving us an opportunity to revise our manu, we appreciate editor and reviewers very much for their positive and constructive comments and suggestions on our manu entitled “The Calculation Method for Comprehensive Damping of Ball Bearings based on Multigrid Method”. (ID:ilt-08-2019-0342.R1).
    We have studied reviewer’s comments carefully and have made revision which marked in red in the paper. Specific revisions include:
    (1) Some grammatical errors and typos and inappropriate sentences in the manuscript have been rectified;
    (2) Provide the non-dimensional equation of Reynolds equation and oil film thickness;
    (3) The formulas necessary and nomenclature and references have been added;
    (4) Add two tables about the error between experimental and theoretical results and give its analysis in conclusion;
    (5) Give a flowchart of the multigrid method to show the entire calculation process involved, and give the convergence criteria.
    We have tried our best to revise our manu according to the comments. Attached please find the revised version, which we would like to submit for your kind consideration.
    In addition, since I am about to graduate in early April, I would appreciate it if you could expedite my revision, thank you. We would like to express our great appreciation to you and reviewers for comments on our paper. Looking forward to hearing from you.
    Thank you and best regards.
    Yours sincerely,
    Peng Sun
    Corresponding author:
    Name: Weifang Chen
    E-mail: meewfchen@nuaa.edu.edu.cn



    Cite this author response
  • pre-publication peer review (ROUND 2)
    Decision Letter
    2020/01/27

    27-Jan-2020

    Dear Mr. Sun:

    Manuscript ID ilt-08-2019-0342.R1 entitled "The Calculation Method for Comprehensive Damping of Ball Bearings based on Multigrid Method" 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 26-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
    (There are no comments.)
    Reviewer: 1

    Comments:
    (There are no comments.)

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

    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?: The literature cited in the manuscript are relevant to the field of research, whereas author(s) have excluded some literature significant enough to include in the literature. A suggestion regarding this has been added in the comment section.

    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 well designed from methodology point of view. The methods employed are appropriate.

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

    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?: The manuscript contains both analytical and experimental work. These findings can be used in further research (both practical and analytical).

    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.: Although, the manuscript is well expressed and readable, there are some sections where sentence need to be restructured.

    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
    2020/01/27

    This reviewer report was submitted to the journal as an attached file and cannot be displayed at this time.

    Reviewed by
    Cite this review
    Author Response
    2019/12/10

    1. It is completely corrected throughout the manuscript that there should be a gap between the number and its unit.
    2. The font size in Fig. 8 is adjusted to be consistent with that in the text.
    3. In order to avoid the influence of uncertain factors caused by a single test, repeated verification of the comprehensive damping is performed under the same conditions to ensure the consistency of multiple consecutive measurements.
    4. The calculated and experimental results is drawn in an image to compare, which is shown in Fig. 9 and Fig. 11. The difference between the models and experiments is elucidated. To verify the correctness of proposed models, two examples is supported between the experimental and calculated results, for example, In Fig. 9, the comprehensive damping test is carried out on deep groove ball bearings under different running conditions.



    Cite this author response
  • pre-publication peer review (ROUND 1)
    Decision Letter
    2019/11/27

    27-Nov-2019

    Dear Mr. Sun:

    Manuscript ID ilt-08-2019-0342 entitled "The Calculation Method for Comprehensive Damping of Ball Bearings based on Multigrid Method" 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 25-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
    This manuscript presents the proposed model of damping for groove ball bearings and the verified experiments. However, follows should correct and revise.
    1. There should be a blank between a digit and its unit, which needs to be corrected thoroughly throughout the manuscript.
    2. The font size is too small to observe in Fig. 8. The font size should be consistent with that in text.
    3. The experimental results should have standard deviation to confirm the several experimental results.
    4. The comparison between calculated and experimental results is lot in this manuscript. The simulated, calculated and experimental results should be drawn in an image to compare. The difference between the models and experiments should be elucidated. To verify the correctness of proposed models, at least two examples should be supported between the experimental and calculated results.

    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. No significant reulsts are lost.

    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?: See the comments.

    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?: See the comments

    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.: See the comments

    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
    2019/09/05

    This manuscript presents the proposed model of damping for groove ball bearings and the verified experiments. However, follows should correct and revise.
    1. There should be a blank between a digit and its unit, which needs to be corrected thoroughly throughout the manuscript.
    2. The font size is too small to observe in Fig. 8. The font size should be consistent with that in text.
    3. The experimental results should have standard deviation to confirm the several experimental results.
    4. The comparison between calculated and experimental results is lot in this manuscript. The simulated, calculated and experimental results should be drawn in an image to compare. The difference between the models and experiments should be elucidated. To verify the correctness of proposed models, at least two examples should be supported between the experimental and calculated results.

    Reviewed by
    Cite this review
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