Diagnosis of Friction on an Unbalanced Rotor by Phase-Shift Empirical Mode Decomposition Integration and Recurrence Plot

Round 1

Reviewer 1 Report

The reviewed article is quite interesting. Contains a thoroughly prepared literature review. A new method of signal processing was proposed to analyze dynamic phenomena. This method was used in experimental research.

However, in my opinion, experimental validation of the obtained results is necessary. It is necessary to compare the signal (e.g. displacement) obtained using the PSEMDI method with the signal measured directly (e.g. with a laser sensor).

Please also clarify the following:

1. How is friction in the measuring system realized? Do disc vibrations change the friction force?
2. What was the vibration level before applying additional mass and friction? The comparison of the acceleration curves would greatly facilitate the analysis of the dynamic phenomena of the system.
3. Why are the waveforms not smooth in Figures 13 and 14? Does this not affect the subsequent analysis of the dynamics of phenomena (Figure 16)? 

Author Response

Thank you for all your comments and suggestions

Author Response File: Author Response.pdf

Reviewer 2 Report

The article is devoted to diagnosis of friction on an unbalanced rotor. The paper presents an analysis of an unbalanced disk mounted on a flexible shaft and subjected to friction. Authors proposed new PSEMDI method for integration the acceleration. The topic of the work is quite relevant.

The article is written casually with poorly understood text and many typos.

 

Some notes are presented below:

1. Fig. 1 needs to be redone so that it would be clear what exactly is drawn.
2. Check the formula for impulses (Line 122)
3. The abbreviation RP is described only in the abstract. This must be repeated in the main text of the article.
4. Formulas (10, 11) are written out incorrectly. What is tv = 1/4 in the description after formula (10)?
5. Line 202: zero symbol is used instead of O
6. Before formula (14): omega is shaft speed or angular speed of the shaft?
7. What's the point in the following sentence:

“If k is the spring constant of the shaft, the equilibrium of the resistance force is equal to the centrifugal force, giving the deflection y in Equation (15). "

The list of comments could be continued.

The authors are invited to rewrite the article (especially the initial part of the article) in order to facilitate understanding of the content of the work and the difference between the results obtained by them from the known previous works. And then they can resubmit the article.

Author Response

Thank you for all your comments and suggestions

Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

Thank you for your replies. I accept the current version of the manuscript. 

Author Response

Thank you for your comments

Reviewer 2 Report

The authors revised the article after the first review. However, as before, the text requires revision.

For example, consider the beginning of Section 2.7 Friction.

1. Formula 16 contains a typo.
2. Parameter r is present in this formula, and parameter e is proposed in the following description.
3. The following sentence is puzzling:

“The sliding velocity of the rotor is represented by the inner circle and it is considered as the angular velocity w = ˙q.”

 

Authors are invited to carefully review the text of the article and correct inaccuracies and imprints.

Author Response

Thank you for your suggestions, observations, and recomenations.

Author Response File: Author Response.pdf