Speed Limit of Linear Induction Motor Subway Trains Running through 65 m Radius Curves on Yard Line

Round 1

Reviewer 1 Report

This paper presents a study on the behaviour of LIM subway trains running through yard tracks. It is an interesting topic that the scientific literature doesn’t deal with. The paper is well structured but is too short.

The two major issues of the paper are:

1.      The lack of any information about the simulated train and the mathematical model. The authors refer to a book, but I would suggest the authors include the final expressions for computing the model. The current version of the paper doesn’t provide information about the parameters of the model and how they interact. For example, how is the friction coefficient introduced in the model? And the worn wheel/rail profile?

2.      The authors also state that only a part of the results is shown in the paper. What is the reason for that? More detailed results can help highlight the behaviour of the train and improve paper quality.

 Other recommendations should be worked out:

 3.      What is the source for Figure 4? It should be mentioned in the text.

4.      To my understanding, Figure 10 (and the following ones) contradicts the results shown in Figures 7 and 9. Figure 7 shows that the wheel-climb coefficient is exceeded for about 24 seconds. Please, explain this in detail.

5.      The spelling of Figure 7 must be reviewed.

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

Dear Authors, thank you for your research, the topic is relevant  I suggest you clarify some points:   1. What is the relevance of "Figure 1."? Where in the text do you mention and describe "Figure 1."? 2. In "2. Train–track coupling dynamic model" you wrote "(see Reference [17] for details)". I understand you used a model. I recommend giving an explanation of "Figure 2.". Since “[17] Zhai W.M. Vehicle-Track Coupled Dynamics. 4th edn. Science Press, Beijing, 2015" (for example) I did not find. Where can I read? 3. From 2015 to 2023, no changes were made to the model? 4. "2.1. LIM system model" taken from "[17] Zhai W.M. Vehicle-Track Coupled Dynamics. 4th edn. Science Press, Beijing, 2015"? 5. "2.2. Electromagnetic action model" where is the model? "Figure 4. Stator coil and track induction plate model" cannot replace "model". I recommend describing the model. 6. "Speed limit of linear induction motor subway trains running through yard line" does this apply to all subway trains in the world? Or a single country/city? I suggest that the title be clarified.   My recommendation "Reconsider after major revision"  kind regards,

Author Response

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Author Response File: Author Response.pdf

Reviewer 3 Report

The reviewer has no concern about overall research quality and recommends publishing the article after taking into consideration some comments below:

1. There is some unknown terminology for me in the article although I am an electromechanical specialist.
For example, "stator coil". It is better to use the word "winding" because it consists of more than one coil. Also, "stator" is applicable mainly for rotating machines with an unmovable outside part which is a stator. However, in the case of LIM, the stator moves because it is installed on the moving carriage. So, it is recommended to use terminology not related to rotating machines and use the words "primary" and "secondary" which are mostly electromagnetic definitions.

The same for the "reaction plate" or somewhere in the article called "induction plate". The term "reaction" refers mostly to DC machines. The secondary conductive plate (or sheet) is more suitable for LIMs.

You can find good examples of terminology in Linear Electric Machines, Drives, and MAGLEVs Handbook by Ion Boldea.

2. Two components of the force affecting the train's stability are shown in Figure 4. However, it is not clear, how exactly these forces are taken into account in the model. At the same time, this is the main novelty element of the article because the stability of non-LIM driven trains is very well investigated. It should be clarified, in my opinion.

3. Typos: rught - right.

Author Response

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Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

I would like to thank the authors for their answers. They have comprehensively fulfilled my comments and improved the paper consequently and I would recommend publishing the paper in its current form.

Author Response

Thank you for your recommendation!

Reviewer 2 Report

dear Authors,

"Accept in present form"

Author Response

Thank you for acceptance!

Reviewer 3 Report

Please, re-check the terminology once again. There are still "reaction plates" and "stator coils" in some paragraphs (for example lines 93, 239, 240, 242 and maybe more).

Also, in lines 183-188, you wrote about elastic modulus, mass, inertia, forces, etc of the primary winding. However, the primary (which is a stator in rotating machines) consists of both a winding and a core.  Probably, it is more correct to remove word "winding" and write only about "primary" of the motor if we talk about mechanical parameters.

Author Response

Many thanks for the comments. Please see the attachment.

Author Response File: Author Response.docx