Design of a Novel Magnetorheological Damper Adaptable to Low and High Stroke Velocity of Vehicle Suspension System

Round 1

Reviewer 1 Report

The reviewer would like to appreciate the authors for the interesting work. The idea of controlling both damping coefficient and SBP is interesting and can bring benefits to the readers.

This is a design article where a new device is presented, therefore the clarity in presenting the new device is a must. Unfortunately, the drawing and figures are not representative of the proposed interesting idea and at this stage it is not easy for the reviewer to judge the work. Therefore I would like to ask the authors to resubmit the interesting work after improving the diagrams and drawings.

minor comments:

a- Is figure 1 borrowed/reproduced from another reference? Is there any need to request for permission to do so?

b-what mode is the 0A curve in fig 2?

c- Fig 3 deserve improvements so that it can explain the good work. Main orifice is not clear. flow of oil is not clear. why magnetic sheildeing ring thickness is changing at different locations? Can you add another half/quarter section view of the device for clarity?

d- a graph is needed to clearly explain the magnetic path. Isn't the main orifice flow outside of the magnetic field path (coil1-core 1 are the path?). if so, then how the magnetic filed can help with adjusting damping coefficient?

e-fig 4 is not clear and is needed to drawn again (please refer to ref below for an example DOI: 10.1109/TMECH.2018.2854791). fig 4,b : what is length?

f-page 1, "The characteristics of the passive damper are determined by the combination of the disc springs to get the desired damping force due to the viscosity of the oil". Please rewrite the sentence.

g- fig 5a. what are the three similar graphs in the right side?

 

h- fig 6. Legend for the graphs are needed.

 

 

 

Author Response

Please refer to the attached file.

Author Response File: Author Response.docx

Reviewer 2 Report

The manuscript deals with the design and testing of a novel magnetorheological damper for a wide range of operation. By a short and detailed introduction, the authors succeed in introducing the topic of MR-dampers comprehensively. The presented idea of an MRF-damper offers novel possibilities for  bilinear damping characteristic’s. An analytical model was applied to calculate the flow and pressure behavior in the main and bypass orifice. Based on this model the characteristic damping behavior is calculated showing the proposed damping characteristics’. Unfortunately, a realized prototype is still in realization process. Thus, no experimental investigation and validation can be presented.

I suggest a publication after the experimental investigation.

In addition, minor revisions are required before publication, details see below.

 

Points of criticism in detail:

• Page 4, Please explain the benefit due to the additional floating piston.
• Page 4, figure 3: Please increase the size of the arrows, marking the two orifices, what is a magnetic shielding ring?
• Page 5, figure 4a: The color table should be changed, insufficient illustration of details, missing legend, mark the contour of the evaluated magnetic field strength in 4b. Figure 4b, please a second y-axis including the magnetic flux density B.
• Page 5, figure 5: Information of the right side is missing (insufficient cut of figure),
• Figure in general: Please use the same color in each picture for ferromagnetic materials, paramagnetic material and so on.
• Page 8, line 183: You should mark the “plug region” in Figure 9.
• Page 8&9: An additional figure of the real core part including the named geometrical parameters would increase the comprehensibility further.
• Page 13, figure 13: Please explain the degressively increase of the damping force in case of I_M = 3, 2 and 1 A.
• Please name the weight of the proposed damper as well as the required electrical power along with the named currents.

Author Response

Please refer to the attached file.

Author Response File: Author Response.docx

Reviewer 3 Report

In this study, the authors led the world in proposing a new type of magnetorheological damper having a specific pole shape function. They firstly did computer simulations to demonstrate its effectiveness which was followed by the field-dependent damping force characteristics. The study is interesting and brings a new insight into the area of magnetorheological dampers and, thus, I strongly recommend this study to be published in Applied Sciences journal.

Author Response

Please refer to the attached file.

Author Response File: Author Response.docx