Experimental Study of Coupled Torsional and Lateral Vibration of Vertical Rotor-to-Stator Contact in an Inviscid Fluid

Round 1

Reviewer 1 Report

Dear authors of the paper "Experimental Study of Coupled Torsional and Lateral Vibration of Vertical Rotor-to-Stator Contact in an Inviscid Fluid". Please find below my recommendations in order to improve the paper quality:

- please add a supplementary picture with a front view for the vertical rotating system (variable speed motor, couple, rotor shaft tank, and the disk) in order to observe better the assembly. 

- in order to observe better the differences between the cases is better to put the results in the same graph such as the evolution of amplitudes and of the frequencies separately.

- have been performed measurements with the rotor balanced? I guess that also this case must be discussed. Do you have a dominant frequency for this case? How it looks the orbit?

- for the last case (Chapter 7) the effects on the stability of the rotor are listed. Can you detail which is the most important ? What is the proportion of each of them in modifying the amplitude?

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

The paper deals with vibrations of rotor systems operating in a fluid. An experimental effort is done. The tests are well-designed and the results are promising. I suggest publication after major revisions as indicated below.

·        Please check text for language and typos.

·        Please clearly give the novelty in this work.

·        Literature survey is poor in Introduction. Authors should discuss more studies recently published. Some suggested papers are given below.

o   https://doi.org/10.1016/j.compstruct.2020.113200

o   https://doi.org/10.1016/j.compositesb.2020.107831

o   https://doi.org/10.1016/j.ymssp.2022.109545

·        Fig.1 is not clear to understand the experimental setup. Please add a sketch showing the setup.

·        Variable parameters should be given to understand the parametric effect.

·        Data collection is not clearly given. Please give the details of data collection procedure.

·        Fig.8a: How can one evaluate the results? Please give more detailed explanation about this chart.

·        The results should be discussed in detail for a better understanding.

·        Is there any other way of studying the effect of fluid?

·        What about other types of fluids?

·        Authors should categorize the response for low and high frequencies.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

Revised version is acceptable.