Abstract

Purpose This work aims to demonstrate the vibration suppression of the rotor system with localized defects on bearing using an integral squeeze film damper (ISFD). Design/methodology/approach Experiments were carried out to study the vibration characteristics of the rotor system with ISFD mounted on fault deep groove ball bearings. Three fault bearings including bearing with outer race defect, inner race defect and ball defect have been used in this paper. The results were compared by use of vibration acceleration level, continuous wavelet transform and envelope spectrum. Findings It was found that ISFD shows excellent damping and vibration attenuation characteristics of the rotor system with defective bearing. The fault bearing rotor system with external ISFD considerably reduces the vibration energy and amplitude compared with the system without ISFD. Originality/value There is a dearth of experimental research pertaining to vibration characteristics of rotor system support by defective bearings with ISFD. Besides, the test provides evidence for the application of ISFD in vibration control of the rotor system with incipient defects on bearing. Peer review The peer review history for this article is available at:


Authors

Hao, Yifan;  Zheng, Chengdong;  Wang, Xiaojing;  Chen, Chao;  Wang, Ke;  Xiong, Xin

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  • 1 reviewer
  • pre-publication peer review (FINAL ROUND)
    Decision Letter
    2020/09/06

    06-Sep-2020

    Dear Hao, Yifan; Zheng, Chengdong; Wang, Xiaojing; Chen, Chao; Wang, Ke; Xiong, Xin

    It is a pleasure to accept your manuscript ilt-04-2020-0144.R3, entitled "Damping Characteristics of Integral Squeeze Film Dampers on Vibration of Deep Groove Ball Bearing With Localized Defects" 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

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    Author Response
    2020/09/06

    Dear Prof. Gachot,
    Thank you for spending the time reading this reply. We would like to extend our heartfelt thanks for your professional revision on our article. We have made extensive and correction to our previous draft based on your insightful suggestions, and the explanations are listed below. Our corrections are given in the normal font and changes/additions to the manuscript in red text.

    Respond to the editorial comments:

    Comment: Please improve the captions (partially just consisting of 2 words) and improve the conclusions section.
    Response: Thank you for the reminding to improve the captions,We have corrected all picture captions that were too short. We have sorted out and improved the conclusion part, if you have more specific suggestions, please let me know.

    Thanks for your time again. If there are any other modifications we should make, please let us know and we really appreciate your help. We hope that our paper will be considered for publication in your journal. Thank you very much again for your great help.

    Yours sincerely



    Cite this author response
  • pre-publication peer review (ROUND 3)
    Decision Letter
    2020/09/05

    05-Sep-2020

    Dear Dr. Wang:

    Manuscript ID ilt-04-2020-0144.R2 entitled "Damping Characteristics of Integral Squeeze Film Dampers on Vibration of Deep Groove Ball Bearing With Localized Defects" 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 improve the captions (partially just consisting of 2 words) and improve the conclusions section.

    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.

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    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 05-Oct-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).

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    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:

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    Author Response
    2020/09/05

    Dear Prof. Gachot and reviewers,
    Thank you for spending the time reading this reply. We would like to extend our heartfelt thanks for your professional revision on our article. We have made extensive corrections to our previous draft based on your insightful suggestions, and the detailed explanations are listed below. The reviewer’s comments are laid out below. Our explanations are given in the normal font and changes/additions to the manuscript in red text.

    Respond to the reviewer1’s comments:
    1. Comment: The details of the three different defects shown in figure 1 are not known. Where are the defects? What are the sizes of the defects?
    Response: Thank you for the reminding to note the position of defects. The specified positions are marked in the figure 1 with ‘Defect’ and arrow. Also, we add one section picture of normal ball bearing without defect in figure 1(a) for comparison. In the section of this figure (2.1 Defect model), the dimension of defects is unnecessary to build the theory model which aims to show the status in whole process when the balls roll from start point to end point. So we didn’t give the specific size of defects. But the dimension is very important for the following testing bearings. We list the detailed information in the section 3 of experimental setup.

    1. Comment: The conclusion (1) is poor written. It is obvious that the vibration magnitudes of the rotor system show a significant decrease when the ISFD mounted on the bearing. It is better to shown what results of the ISFD mounted on the different kinds of defect bearings. The mechanisms of these findings should be drew.
      Response: Thank you very much for your guidance. We have added the comparison to show the results of the ISFD mounted on the different kinds of defect bearings in conclusion.

    Thanks for your time again. If there are any other modifications we should make, please let us know and we really appreciate your help. We hope that our paper will be considered for publication in your journal. Thank you very much again for your great help.

    Yours sincerely



    Cite this author response
  • pre-publication peer review (ROUND 2)
    Decision Letter
    2020/09/02

    02-Sep-2020

    Dear Dr. Wang:

    Manuscript ID ilt-04-2020-0144.R1 entitled "Damping Characteristics of Integral Squeeze Film Dampers on Vibration of Deep Groove Ball Bearing With Localized Defects" 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 02-Oct-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.

    To help support you on your publishing journey we have partnered with Editage, a leading global science communication platform, to offer expert editorial support including language editing and translation.
    If your article has been rejected or revisions have been requested, you may benefit from Editage’s services. For a full list of services, visit: authorservices.emeraldpublishing.com/
    Please note that there is no obligation to use Editage and using this service does not guarantee publication.

    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

    (1) The details of the three different defects shown in figure 1 are not known. Where are the defects? What are the sizes of the defects?
    (2) The conclusion (1) is poor written. It is obvious that the vibration magnitudes of the rotor system show a significant decrease when the ISFD mounted on the bearing. It is better to shown what results of the ISFD mounted on the different kinds of defect bearings. The mechanisms of these findings should be drew.
    Reviewer: 1

    Recommendation: Minor Revision

    Comments:

    (1) The details of the three different defects shown in figure 1 are not known. Where are the defects? What are the sizes of the defects?
    (2) The conclusion (1) is poor written. It is obvious that the vibration magnitudes of the rotor system show a significant decrease when the ISFD mounted on the bearing. It is better to shown what results of the ISFD mounted on the different kinds of defect bearings. The mechanisms of these findings should be drew.

    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. All peer review content displayed here will be covered by a Creative Commons CC BY 4.0 license.: Yes, I would like my name to appear with my report on Publons

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    Reviewer report
    2020/09/02

    (1) The details of the three different defects shown in figure 1 are not known. Where are the defects? What are the sizes of the defects?
    (2) The conclusion (1) is poor written. It is obvious that the vibration magnitudes of the rotor system show a significant decrease when the ISFD mounted on the bearing. It is better to shown what results of the ISFD mounted on the different kinds of defect bearings. The mechanisms of these findings should be drew.

    Reviewed by
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    Author Response
    2020/08/07

    Dear Editors and reviwers,
    Thank you for spending the time reading this reply. We would like to extend our heartfelt thanks for your professional revision on our article. As you have pointed out, there are several problems that need to be addressed. We have made extensive corrections to our previous draft based on your insightful suggestions, and the detailed explanations are listed below. The reviewer’s comments are laid out below in italicized font. Our explanations are given in the normal font and changes/additions to the manuscript in red text.

    Respond to the reviewer1’s comments:
    1.Comment: Why the rotor-bearing can be regarded as a ISFD system? The oil film and the stiffness vary with time and the movement of ball.
    Response: The system was simplified as a Jeffcott rotor supported by two rolling bearings and then established a steady-state vibration model of this rotor system, which considered ISFD system linear processing of the dynamic characteristic parameters.
    The dynamic characteristic parameters of the bearing and ISFD are relatively independent. The overall stiffness of the bearing is related to rotational speed and load state. Ball-raceway point contact stiffness of bearing will change due to different defects. And the stiffness of the damper is a fixed value under a specific design parameter.
    According to the reviewer’s comment, we have added some detailed information in red text to explain the system.
    2.Comment: How to measure the stiffness and damping of the ISFD? Why are they the fixed data?
    Response: The integral springs in the ISFD are the only major contributors to the radial bearing support stiffness. Therefore, Stiffness and damping in the new ISFD structure are relatively independent.
    The derived stiffness of ISFD was deduced by using the general Hook's principle and the second Castigliano's theorem. Besides, we also calculated this parameter by the method of finite element analysis. After the above steps, we compared the calculated results. If the results are not consistent, we will modify the design parameters of ISFD until the appropriate stiffness value is obtained.
    The dynamic lubricant theories of the infinitely short journal bearing and long bearing applied to no end face seals are employed to solve the Reynolds equation. By doing this, the damping of ISFD can be obtained. And it can be adjusted by the change of the oil film force caused by small disturbance.
    According to the reviewer’s valuable comments and other researchers, we have added some details with red text in section 2.4.
    3.Comment: Which bearing is tested in the figure 3.
    Response: In the left figure of figure 3, the right bearing2 is test bearing. And the right figure 3 is the picture of a test bearing without ISFD. According to the reviewer’s comment, we added some notes on picture 3 like following in the rectangle.
    Figure 3 Test rig and transducer setup

    4.Comment: The reasons why the curves vary with rotation speed and time shown in figure 4 and figure 5 respectively.
    Response:
    1)In figure 4, the red line represents the response of test results without ISFD, and the black one represents the response of test results with ISFD. ISFD provides viscous damping to dissipate the vibration energy, so the black lines are significantly lower than the red lines.
    For each curve, the vibration increases with the increase of rotational speed at the beginning, and rapidly soars to the peak at resonance, but drops sharply when speed exceeds the first resonance area, and then increase steadily again. The acceleration values of housing can accurately reflect the status of system vibration.
    2)Figure 5 is the result during the speed-up process, the rotor speed evenly rising from 0rpm to 6000rpm in 20 seconds. So that the amplitudes vary with time.
    According to the reviewer’s comment, we have added more explanations about figure 4 and figure 5 in the manuscript.
    5.Comment: The quality of figure 8, figure 9 and figure 10 should be improved.
    Response: We agree that the quality of figures 8, figure 9 and figure 10 should be improved. We have carefully checked these pictures and tried our best to show them clearly. And these figures contain a lot of information, so we can only enlarge the important details and highlighted lines.
    6.Comment: The more details, discussion and the relevant references should be given in this paper.
    Response: Thank you very much for your guidance. We have added the detailed discussion after every part, added more details and relevant references in the manuscript.
    7.Comment: The English should be improved. For example, " It can evaluated " is wrong.
    Response: We feel sorry for our carelessness. We tried our best to improve the manuscript and made some changes in the manuscript. These changes will not influence the content and framework of the paper. And here we did not list the changes, but marked in the revised paper. We appreciate for Editors/Reviewers’ warm work earnestly and hope that the correction will meet with approval.

    Respond to the reviewer2’s comments:
    1.Comment: The introduction reads fine. Apart from the presented state of the art regarding squeeze film dampers, you may think to introduce surface texturing of these components since this is a way to improve their tribological performance. You may want to refer to the following article for further guidance: Wear Behavior of Laser-Patterned Piston Rings in Squeeze Film Dampers
    Response: We sincerely appreciate the valuable comments. We have checked the literature carefully and added more references to the INTRODUCTION part in the revised manuscript.
    [9] Rosenkranz, A., Jaeger, S. and Mücklich, Frank. (2015), “ Wear behavior of laser-patterned piston rings in squeeze film dampers”, Advanced Engineering Materials, Vol. 17 No. 8, pp. 1208-1214.
    2.Comment: How realistic are the computed stiffness for the system?
    Response: The derived stiffness of ISFD was deduced by using the general Hook's principle and the second Castigliano's theorem. Besides, we also calculated this parameter by the method of finite element analysis. After the above steps, we compared the calculated results. If the results are not consistent, we will modify the design parameters of ISFD until the appropriate stiffness value is obtained. According to the reviewer’s valuable comments and other researchers, we have added some details and the following reference with red text in section 2.4.
    [16] Ertas, B., Delgado, A., and Moore, J. (2018), “Dynamic characterization of an integral squeeze film bearing support damper for a supercritical co-2 expander”, Journal of Engineering for Gas Turbines and Power, Vol. 140 No. 5, pp. 052501.1-052501.9.
    3.Comment: The captions of the figures should be improved.
    Response: We have improved these captions of some pictures according to the reviewer’s suggestion.
    4.Comment: How were the defects produced?
    Response: The defects were created on test bearings by electric discharge machining (EDM). Besides, we have added the description of EDM in the manuscript according to the reviewer’s suggestion.
    5.Comment: Partially, the figures and the legends are not consistent with each other. Please unify.
    Response: We have tried our best to correct the figures and legends with red text in the article.
    6.Comment: It would be nice to combine Figure 8, 9 and 10.
    Response: Thanks for your advice. We had combined Figure 8, 9 and 10, we also enlarged the details in these figures.
    Comment: The discussion of the experimental results should be extended.
    Response: Thank you very much for your guidance. We have added the detailed discussion after every part, added more details and relevant references in the manuscript.

    Thanks for your time again. If there are any other modifications we should make, please let us know and we really appreciate your help. We hope that our paper will be considered for publication in your journal. Thank you very much again for your great help.

    Yours sincerely,
    Yifan Hao
    Corresponding author:
    Name: Xiaojing Wang
    E-mail: wangxjshu@163.com



    Cite this author response
  • pre-publication peer review (ROUND 1)
    Decision Letter
    2020/05/25

    25-May-2020

    Dear Dr. Wang:

    Manuscript ID ilt-04-2020-0144 entitled "Damping Characteristics of Integral Squeeze Film Dampers on Vibration of Deep Groove Ball Bearing With Localized Defects" 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 23-Aug-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.

    To help support you on your publishing journey we have partnered with Editage, a leading global science communication platform, to offer expert editorial support including language editing and translation.
    If your article has been rejected or revisions have been requested, you may benefit from Editage’s services. For a full list of services, visit: authorservices.emeraldpublishing.com/
    Please note that there is no obligation to use Editage and using this service does not guarantee publication.

    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
    1. Why the rotor-bearing can be regarded as a ISFD system? The oil film and the stiffness vary with time and the movement of ball.
    2. How to measure the stiffness and damping of the ISFD? Why are they the fixed data?
    3. Which bearing is tested in the figure 3.
    4. The reasons why the curves vary with rotation speed and time shown in figure 4 and figure 5 respectively.
    5. The quality of figure 8, figure 9 and figure 10 should be improved.
    6. The more details, discussion and the relevant references should be given in this paper.
    7. The English should be improved. For example, "It can evaluated " is wrong.

    Reviewer: 2

    Comments to the Author
    - The introduction reads fine. Apart from the presented state of the art regarding squeeze film dampers, you may think to introduce surface texturing of these components since this is a way to improve their tribological performance. You may want to refer to the following article for further guidance: Wear Behavior of Laser‐Patterned Piston Rings in Squeeze Film Dampers

    • How realistic are the computed stiffness for the system?

    • The captions of the figures should be improved.

    • How were the defects produced?

    • Partially, the figures and the legends are not consistent with each other. Please unify.

    • It would be nice to combine Figure 8, 9 and 10.

    • The discussion of the experimental results should be extended.
      Reviewer: 1

    Recommendation: Major Revision

    Comments:
    1. Why the rotor-bearing can be regarded as a ISFD system? The oil film and the stiffness vary with time and the movement of ball.
    2. How to measure the stiffness and damping of the ISFD? Why are they the fixed data?
    3. Which bearing is tested in the figure 3.
    4. The reasons why the curves vary with rotation speed and time shown in figure 4 and figure 5 respectively.
    5. The quality of figure 8, figure 9 and figure 10 should be improved.
    6. The more details, discussion and the relevant references should be given in this paper.
    7. The English should be improved. For example, "It can evaluated " is wrong.

    Additional Questions:
    Originality: Does the paper contain new and significant information adequate to justify publication?: No, the ISFD has been applied in some studies.

    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 more details, discussion and the relevant references should be given in this 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?: 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.: English should be improved.

    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. All peer review content displayed here will be covered by a Creative Commons CC BY 4.0 license.: Yes, I would like my name to appear with my report on Publons

    Reviewer: 2

    Recommendation: Major Revision

    Comments:
    - The introduction reads fine. Apart from the presented state of the art regarding squeeze film dampers, you may think to introduce surface texturing of these components since this is a way to improve their tribological performance. You may want to refer to the following article for further guidance: Wear Behavior of Laser‐Patterned Piston Rings in Squeeze Film Dampers

    • How realistic are the computed stiffness for the system?

    • The captions of the figures should be improved.

    • How were the defects produced?

    • Partially, the figures and the legends are not consistent with each other. Please unify.

    • It would be nice to combine Figure 8, 9 and 10.

    • The discussion of the experimental results should be extended.

    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. All peer review content displayed here will be covered by a Creative Commons CC BY 4.0 license.: No, I would not like my name to appear with my report on Publons

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    Reviewer report
    2020/05/25

    • The introduction reads fine. Apart from the presented state of the art regarding squeeze film dampers, you may think to introduce surface texturing of these components since this is a way to improve their tribological performance. You may want to refer to the following article for further guidance: Wear Behavior of Laser‐Patterned Piston Rings in Squeeze Film Dampers

    • How realistic are the computed stiffness for the system?

    • The captions of the figures should be improved.

    • How were the defects produced?

    • Partially, the figures and the legends are not consistent with each other. Please unify.

    • It would be nice to combine Figure 8, 9 and 10.

    • The discussion of the experimental results should be extended.

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    Reviewer report
    2020/05/23

    1. Why the rotor-bearing can be regarded as a ISFD system? The oil film and the stiffness vary with time and the movement of ball.
    2. How to measure the stiffness and damping of the ISFD? Why are they the fixed data?
    3. Which bearing is tested in the figure 3.
    4. The reasons why the curves vary with rotation speed and time shown in figure 4 and figure 5 respectively.
    5. The quality of figure 8, figure 9 and figure 10 should be improved.
    6. The more details, discussion and the relevant references should be given in this paper.
    7. The English should be improved. For example, "It can evaluated " is wrong.

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