Research on Dynamic Characteristic Coefficients of Integral Squeeze Film Damper

Round 1

Reviewer 1 Report

The paper "Research on Dynamical Characteristic Coefficients of Integral Squeeze Film Damper" presents an interesting analysis of the ISFD dynamic characteristics parameter. The results of theoretical studies and numerical analyses on the ISFD stiffness coefficient and the damping coefficient are compared with those obtained with the help of an experimental test facility with bidirectional excitation.

I consider that the paper is interesting and will be able to be published in "Machines" after relatively few improvements, such as:

The authors could make clarifications on how to obtain the images in Figures 6 and 7 and their interpretation.

The authors could provide additional information regarding the components of the experimental platform, their characteristics, and their manufacturer.

Thank you

Author Response

Please refer to the attached document.

Author Response File: Author Response.docx

Reviewer 2 Report

364. -Mechanical properties analysis and Computational Fluid Dynamics (CFD) analyses are conducted. Additionally, a Bi-directional excitation test rig is constructed. -Models of ISFD are established, conducting analyses on both solid mechanics and fluid dynamics. -The stiffness coefficients and damping coefficients of ISFD are identified through both numerical analyses and experimental methods. The paper is well done.

Minor text editing in English.

Author Response

Please refer to the attached document.

Author Response File: Author Response.docx

Reviewer 3 Report

The paper presents numerical and experimental study on the behavior of an Integral Squeeze Film Damper. The CFD analysis and the experimental validation are the main parts of the paper.

The paper needs some clarifications or corrections:

1.       The theoretical hydrodynamic approach from chapter 2.2 is unacceptable.  The hydrodynamic equation for the model of squeeze film of ISFD is not correct. There shouldn’t be the term 12𝜇 (𝜕ℎ/𝜕𝑥) in this. The coordinate system is not defined. The “short bearing solution” you mentioned is actually the Long bearing approximation. Lines 139-156 should not be included in the paper.

2.       The FEM simulation from chapter 3.1 is used for determining the stiffness but also for checking the strength of the mechanical structure.  Which are the characteristics of the S-type elastomer mentioned in chapter 3.1? You only mention the steel, but the maximum stress is in the elastomer.

3.       Line 217: Vortex motion? There is no rotation between inner and outer ring of the ISFD

4.       Line 223: Do not use both Pa and MPa (MPa not Mpa in line 237)

Author Response

Please refer to the attached document.

Author Response File: Author Response.docx

Reviewer 4 Report

Please refer to my report that is attached.

Comments for author File: Comments.pdf

Please refer to my report that is attached.

Author Response

Please refer to the attached document.

Author Response File: Author Response.docx

Round 2

Reviewer 3 Report

Accept in present form

Reviewer 4 Report

I recommend publication in the current version.