Investigation of Low-Frequency Data Significance in Electric Vehicle Drivetrain Durability Development
Round 1
Reviewer 1 Report
Comments and Suggestions for AuthorsDear Authors
In the article entitled Investigation of Low-Frequency Data Significance in Electric Vehicle Drivetrain Durability Development The authors checked the extent to which low-frequency data can be used in testing the durability of the drivetrain. For this analysis, they used 5 methods (rollover classification, time at level EM Power, time at level Temperature, Rainfloe EM Power and Rainflow Temperature and 17 vehicles divided into 5 groups. The basis of the analysis were the currently traditional fatigue testing methods using the Woehler line and Miner relationship. The considerations are supported by numerous diagrams, thanks to which it will be possible to persuade many researchers to use the described approach. It would also be useful to provide literature on the difficult issue related to rollover classification, such as: 1) Feixiang Xu, Xinhui Liu and Chen Zhou: Developing an Ontology-Based Rollover Monitoring and Decision Support System for Engineering Vehicle. Information 2018, 9, 112; doi:10.3390/info9050112. 2) NHTSA's: Rating System for Rollover Resistance: An Assessment. Transportation Research Board Special Report 265. In future research, in addition to increasing the number of tests (which is obvious), it should be replaced by more accurate modern (probabilistic) methods. They should take into account the influence of low-high, high-low or low-high-low stress interactions on the acceleration or delay of the accumulation of fatigue damage and thus on the fatigue life. The manuscript could also provide more details about the damage, but these are probably sensitive or confidential data of the facility carrying out the research. Congratulations on your successful publication. Best regards, Reviewer
Comments for author File: 
Comments.pdf
Author Response
Dear Editor and Reviewers,
Thank you for your feedback on February 11. We appreciate the time and effort you put into reviewing our manuscript. Your suggestions have helped us improve our work. We value your comments and suggestions.
We have uploaded the revised manuscript file according to your instructions. We have also included a copy of the original manuscript with the changes highlighted in different colors. Please find our point-by-point response to the reviewers' comments in the attached cover letter.
We would also like to thank you for allowing us to resubmit a revised copy of the manuscript. We hope that the revised manuscript will be accepted for publication in the World Electric Vehicle Journal.
Sincerely,
Mingfei Li
Author Response File: Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for AuthorsThe presented manuscript is aimed at the research, which analyses significance of the low-frequency data in electric vehicle drivetrain durability.
In principle, the manuscript is interesting and well written.
The manuscript includes a literature review, a description of the solved problem, a presentation of the results and conclusions.
In my opinion, significant deficiencies are not identified in the manuscript.
Following minor revisions should be performed:
- Keywords: do not write abbreviations (BEV),
- Introduction: do not write “chapter”, use rather “section”,
- Section 2: write some “introducing text” before section 2.1,
- Figure 1: add unit to the vertical axis,
- Equations: use the sign “ ∙ ” instead of “ * ”,
- Figure 2: add units to the vertical and horizontal axes,
- Figure 3: add units to the vertical and horizontal axes,
- Figure 4: add units to the vertical to the axes,
- Section 3: write some “introducing text” before section 3.1,
- Figure 11, Figure 13, Figure 15: it is not clear, what do vehicles 1 to 4 mean?
- Figure 14 is missing,
- Conclusions: this section needs to be modified. Conclusions should not include tables, figures… Modify it e.g. by adding section “discussions”, where you provide the discussion of your findings and results and the “Conclusion” will be arranged in a usual way.
Author Response
Dear Editor and Reviewers,
Thank you for your feedback on February 11. We appreciate the time and effort you put into reviewing our manuscript. Your suggestions have helped us improve our work. We value your comments and suggestions.
We have uploaded the revised manuscript file according to your instructions. We have also included a copy of the original manuscript with the changes highlighted in different colors. Please find our point-by-point response to the reviewers' comments in the attached cover letter.
We would also like to thank you for allowing us to resubmit a revised copy of the manuscript. We hope that the revised manuscript will be accepted for publication in the World Electric Vehicle Journal.
Sincerely,
Mingfei Li
Author Response File: Author Response.pdf
Reviewer 3 Report
Comments and Suggestions for AuthorsThe article concerns an important area of development of EV's and is certainly needed. The manuscript was well-structured and professionally prepared. All relevant information has been included so that there is no problem in understanding the authors' intentions. The experiments were prepared in a thoughtful way. The obtained results constitute an important contribution of the authors in the field of optimization methodology for the development of electric vehicles. The article seems to fill the current gap in the researchers' approach to the issue.
Author Response
Dear Editor and Reviewers,
Thank you for your feedback on February 11. We appreciate the time and effort you put into reviewing our manuscript. Your suggestions have helped us improve our work. We value your comments and suggestions.
We have uploaded the revised manuscript file according to your instructions. We have also included a copy of the original manuscript with the changes highlighted in different colors. Please find our point-by-point response to the reviewers' comments in the attached cover letter.
We would also like to thank you for allowing us to resubmit a revised copy of the manuscript. We hope that the revised manuscript will be accepted for publication in the World Electric Vehicle Journal.
Sincerely,
Mingfei Li
Author Response File: Author Response.pdf
Reviewer 4 Report
Comments and Suggestions for AuthorsThe topic of the manuscript is relevant.
The Introduction provides a sufficient overview of the sources. Most of the sources are fairly recent, although there are a few very old sources.
The problem under consideration is sufficiently clearly described. Durability theory and statistical assumption are discussed in Section 2. The illustrations in this section (Figures 2, 3, 4) are of a rather general nature, neither units of measurement nor specific sizes are specified. Figure 5 is also not very typical for a scientific paper.
Data significance in durability analysis is discussed in Section 3. The quality of the figures should be improved in this section (especially Figures 10-13). It is quite difficult to understand the essence of these figures, because in some places there are a lot of lines, and the chosen colors and nature of lines do not allow to see the differences. Maybe the lines should be highlighted somewhere, or the essential parts of the pictures should be shown enlarged.
Figure 16 shows the normalized damages of 17 vehicles, including 1 company car, 3 taxi cars, 10 ridepooling cars, 1 private car, and 2 test cars. The authors could specify why there is such a choice of vehicles. In addition, it may have been appropriate to examine an equal number of vehicles of the respective type in order to identify significant differences.
In my opinion, the presentation of Table 2 in the Conclusions section is not very appropriate. It would be better to present and discuss it in the main text of the manuscript, and only give a reference to this table in the conclusion.
Author Response
Dear Editor and Reviewers,
Thank you for your feedback on February 11. We appreciate the time and effort you put into reviewing our manuscript. Your suggestions have helped us improve our work. We value your comments and suggestions.
We have uploaded the revised manuscript file according to your instructions. We have also included a copy of the original manuscript with the changes highlighted in different colors. Please find our point-by-point response to the reviewers' comments in the attached cover letter.
We would also like to thank you for allowing us to resubmit a revised copy of the manuscript. We hope that the revised manuscript will be accepted for publication in the World Electric Vehicle Journal.
Sincerely,
Mingfei Li
Author Response File: Author Response.pdf
