Numerical and Experimental Studies of the Attenuation Characteristics of Friction Torque in a Wet Multidisc Clutch

Round 1

Reviewer 1 Report

Very interesting paper combining theoretical work with experimental validation !

To increase understanding and rating by the readers it would be usefull to add data about accuracy of CoF measured at the test rig. Differences are small and therefore confidence level of CoF is of important interest.

CoF during each engagement typically is like a curve not a constant value; how is CoF at figures 11 and 12 calculated ? short description would be usefull.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

The paper deals with the Numerical and Experimental Studies on the
Attenuation Characteristics of Friction Torque in a
Wet Multidisc Clutch.
The paper, in the opinion of the reviewer, is worth publishing
at Applied Sciences Journal, but some corrections are needed.
While the authors have made considerable research effort,
the presentation of the paper and the results must be improved.
The reviewer suggested corrections to the authors,
which of accepted and inserted in the paper,
then the paper can be accepted for publication
in the journal.

Comment 1
Line 8
Abstract (Bold)

Comment 2
Line 26
transient temperature model, Cui, et al. [3] and Xie, et al. [4] revealed that the grooved regions of

=> Change (without ,)

transient temperature model, Cui et al. [3] and Xie et al. [4] revealed that the grooved regions of

Comment 3
Line 27
friction component could reduce the temperature gradient and deformation effectively. Marklund,

=> Change (without ,)

friction component could reduce the temperature gradient and deformation effectively. Marklund

Comment 4
Line 31
As shown in Fig. 1, the spline teeth

=> change

As shown in Figure 1, the spline teeth

Comment 5
Line 36
consequences on the friction torque of clutch. Newcomb, et al [8] developed

=> Change (without ,)

consequences on the friction torque of clutch. Newcomb et al [8] developed

Comment 6
Line 38
Moreover, by using the thermal model of multidisc clutch, Yu, et al. [9] investigated

=> Change (without ,)

Moreover, by using the thermal model of multidisc clutch, Yu et al. [9] investigated

Comment 7
There are several sentences
in the text in which the word friction
is used many times (more than 2).
Τhe authors need to rewrite these sentences.

Comment 8
Line 52
Fig. 2 presents a three-dimensional exploded layout

=> change Fig to Figure

Figure 2 presents a three-dimensional exploded layout

Comment 9
Figure 2 must be accompanied on the same page as the Figure's title.

Comment 10
Line 62
Spline friction

=> Change

2.1. Spline friction

Comment 11
Line 64
plate is chosen for the theoretical analysis and formula derivation. As shown in Fig. 3, during the

=>

plate is chosen for the theoretical analysis and formula derivation. As shown in Figure 3, during the

Comment 12
Equations 1 - 10
Align the equations completely.
The numbering of the equations should be at the end of the row on the right side of the text.

Comment 13
All Figures contain a dot (.) at the bottom right. Delete the dot (.) from all Figures.

Comment 14
Line 80
Contact pressure

=> Change

2.2. Contact pressure

Comment 15
Line 81
As shown in Fig. 4, the pressure

=> change Fig. to Figure

As shown in Figure 4, the pressure

Comment 16
Line 91
Friction torque

=> change

2.3. Friction torque

Comment 17
Line 94
How is the relative sliding speed ν calculated?

Comment 18
Lines 96 - 97
Change the text size (other format with the other text).
The paper format is not the same throughout the paper.
There are text pieces that follow another format,
while in other places the text is formatted differently.

Comment 19
Line 107
Numerical simulation

=> change

3. Numerical simulation

Comment 20
Lines 108 - 110
Change the text size (other format with the other text).
The paper format is not the same throughout the paper.
There are text pieces that follow another format,
while in other places the text is formatted differently.

Comment 21
Line 111
Under different applied pressure, the variation of interface COF is shown in Fig. 5.

=> change Fig. to Figure

Under different applied pressure, the variation of interface COF is shown in Figure 5.

Comment 22
Line 116
Table 1 Physical parameters of the friction components.
Table 1. (bold)
What is the af?

Comment 23
Figure 5
The authors do not adequately explain the Figure 5.
While in Line 119 they state that "According to Eqs. (5), (7) and (8), the interface COF and contact pressure under different working
conditions are shown in Figs. 6 and Figs. 7, respectively. "
for Figure 5 do not comment in detail how it is created.

Comment 24
Line 120
conditions are shown in Fig. 6 and Fig. 7, respectively. As depicted in Fig. 6, the farther the friction

=> change Fig. to Figure

conditions are shown in Figure 6 and Figure 7, respectively. As depicted in Figure 6, the farther the friction

Comment 25
Line 123
agreement with Fig.5.

=> change Fig. to Figure

agreement with Figure 5.

Comment 26
Figure 6
Number of frition pair

=> change (c missing from the word friction)

Number of friction pairs

Comment 27
Line 127
the number of the friction pairs, as shown in Fig. 7. Additionally,

=> change Fig. to Figure

the number of the friction pairs, as shown in Figure 7. Additionally,

Comment 28
Line 133
As shown in Fig.8, the friction torque

=> change Fig. to Figure

As shown in Figure 8, the friction torque

Comment 29
Figure 8
Considering the spline frition

=> change (c missing from the word friction)

Considering the spline friction

Comment 30
How is the ideal case calculated?

Comment 31
Experimental equipment

=>

4.1. Experimental equipment

Comment 32
As depicted in Fig. 9, the test bench

=> change Fig. to Figure

As depicted in Figure 9, the test bench

Comment 33
Equation 11 is not described in detail.
what do po and M mean?

Comment 34
Figure 9 must be accompanied on the same page as the Figure's title.

Comment 35
Line 174
system. Fig.10 shows the experiment conditions.

=> change Fig. to Figure

system. Figure 10 shows the experiment conditions.

Comment 36
Figure 10
Figure 10a: In which cases are the colors mentioned?
Figure 10b: the unit for Rotating speed (rpm)

Comment 37
Line 183
and six-friction pair system are shown in Fig. 11 and Fig. 12, respectively. The mean values of the

=> change Fig. to Figure

and six-friction pair system are shown in Figure 11 and Figure 12, respectively. The mean values of the

Comment 38
Figure 11
Figure 11 must be accompanied on the same page as the Figure's title.

Comment 39
Line 205
Table 3 Mean values of the two systems.

=> Table 3. (Bold)

Table 3. Mean values of the two systems.

Comment 40
Table 3
Table 3 must be accompanied on the same page as the table's title.

Comment 41
Line 206
According to Fig. 6 and Fig7, the contact pressure

=> change Fig. to Figure

According to Figure 6 and Figure 7, the contact pressure

Comment 41
Line 219
Before Table 4, the authors must add a Figure (or table)
for the theoretical and experimental results comparison.

Comment 42
Line 248
References (The word must be Bold)

Comment 43
Line 249
No bold [1] Yang:

Comment 44
Reference
Increase the number of the reference papers including (primarily) from MDPI journals.

Comment 45
Τhe references format is not the appropriate.
The authors must use the Instructions for Authors
(https://www.mdpi.com/journal/applsci/instructions)
References should be described as follows, depending on the type of work:
Journal Articles:
1. Author 1, A.B.; Author 2, C.D. Title of the article. Abbreviated Journal Name Year, Volume, page range.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

Comment 1
Line 10
torque(FT)

replace

torque (FT)

Comment 2
The numbering of the equations should be at the end of the row on the right side of the text.

Comment 3
Figure 9 and 10 (Optional)
The figure a and b must be accompanied on the same page as the figure's title.

Comment 4
Line 175
system. Figure10

Replace

system. Figure 10

Comment 5
Line 236
Author Contributions: Author Contributions:
Delete one of them

Comment 6
Line 242
Funding: Funding:
Delete one of them

Comment 7
Τhe references format is not the appropriate.
The authors must use the Instructions for Authors
(https://www.mdpi.com/journal/applsci/instructions)
References should be described as follows, depending on the type of work:
Journal Articles:
1. Author 1, A.B.; Author 2, C.D. Title of the article. Abbreviated Journal Name Year, Volume, page range.

Year (Bold)
Abbreviated Journal Name + Volume (italics)

You can see the:
https://www.mdpi.com/journal/applsci/instructions

Author Response

Please see the attachment.

Author Response File: Author Response.pdf