Optimization of Hydraulic Fine Blanking Press Control System Based on System Identification
Round 1
Reviewer 1 Report
The article is interesting, it needs some minor improvements - the detailed comments I have made directly in the PDF file
Comments for author File: 
Comments.pdf
Author Response
Response to Reviewer 1 Comments
Point 1: The article is interesting, it needs some minor improvements - the detailed comments I have made directly in the PDF file.
Response 1: Thank you very much for your approval of this article. The suggestions for improvement put forward in the PDF have been completed one by one and marked in the revised article.
Author Response File: 
Author Response.docx
Reviewer 2 Report
Please see the attached file.
Comments for author File: Comments.pdf
Author Response
Response to Reviewer 2 Comments
General notes:
Point 1: In my opinion, following the journal guidelines (https://www.mdpi.com/journal/processes/instructions), the paper must contain an introduction section, materials and methods section, results section, discussion section and conclusion section. I suggest to reorganize the paper following these instructions.
Response 1: In the revised essay, already reorganize the paper following these instructions.
Point 2: Please format the paper as required by the journal guidelines (https://www.mdpi.com/journal/processes/instructions).
Response 2: In the revised essay, already format the paper as required by the journal guidelines.
Point 3: Please improve the quality of the figures.
Response 3: In the revised essay, already improve the quality of some figures such as figure 2, figure 5 etc..
Point 4: Please report all the measurement units of the terms of each equation.
Response 4: In the revised essay, already report all the measurement units of the terms of each equation.
Point 5: Maybe a list of symbols with their description could improve the readability of the paper.
Response 5: Personally, I think there are not too many symbols in this article. So, tt may be better to introduce and explain them when they appear.
Point 6: Please add more references in the paper on the aspects which are already known in literature, e.g. system identification description.
Response 6: In the revised essay, recent references on hydraulic system control and system identification have been added.
References
Point 1: A too high number of self-citations seems to be registered in the paper. Please reduce this number or motivate further this choice.
Response 1: In the revised essay, already reduce self-citations.
Section 1 (Introduction)
Point 1: Please extend the bibliographical review.
Response 1: In the revised essay, already extend the bibliographical review.
Point 2: At the end of the introduction, the descriptions of the sections of the work must be added.
Response 2: In the revised essay, already added descriptions of the sections of the work at the end of the introduction.
Section 2 (Hydraulic system of FBP and its modeling)
Point 1: Lines 107-108: in my opinion, a reference to the partner can be included in an acknowledgments section (see https://www.mdpi.com/journal/processes/instructions).
Response 1: In the revised essay, already deleted a reference to the partner.
Point 2: In my opinion, Section 2.1 must be extended in order to better clarify the process and to discuss the automation hierarchy within this type of process. Furthermore, a list with the Manipulated Variables, Controlled Variables and Disturbance Variables and of the measured process variables could improve the readability of the paper.
Response 2: In the revised essay, we extended section 2.1. The workflow of our equipment is introduced in detail, and a list with the Manipulated Variables, Controlled Variables and Disturbance Variables and of the measured process variables is added.
Point 3: Please better explain the Figure 2.
Response 3: In the revised essay, Some contents have been added to explain Figure 2 and its variables in detail.
Point 4: Please report the nonlinear characteristics described in Section 2.2.1, justifying the linear approximation reported in Equation (1).
Response 4: In the revised essay, the reasons for the nonlinearity of this model are added and explained, and justified the linear approximation.
Point 5: Please better detail how Equation (3) is obtained and further assess the assumptions.
Response 5: In the revised essay, the acquisition of Equation (3) is described in detail and evaluated.
Point 6: Please better explain how Equation (9) is obtained.
Response 6: For some format reasons, Equation (4) in the PDF of the previous version displays abnormally. In the revised essay, added Equation (4) and explains how to activate Equation (9).
Section 3 (System identification in BL stage of FBP)
Point 1: Lines 243-244: please add references on the used instruments. Please add a subsection where hardware and software exploited are suitably detailed.
Response 1: In the revised essay, already add a subsection where hardware and software exploited are suitably detailed.
Point 2: Please improve the schematic diagram of Figure 5.
Response 2: In the revised essay, already improved the schematic diagram.
Point 3: Lines 260-261: please further justify the choice of the reported parameters.
Response 3: In the revised essay, the reasons for selecting these parameters are explained in detail
Point 4: Lines 276-278: please justify the choice of ARX model.
Response 4: In the revised essay, the reasons for choice of ARX model are explained.
Point 5: Lines 288-289: please justify the choice of AIC and FPE methods.
Response 5:The reasons for choice of AIC and FPE methods are explained in the revised essay.
Point 6: Maybe there are some typos at line 294.
Response 6: Due to some format problems of Mathtype, part of Mathtype does not display normally and has been corrected.
Point 7: Please discuss the obtained value at line 299.
Response 7: The obtained values have been analyzed and introduced in the revised essay.
Point 8: Line 306: please justify the choice.
Response 8: Explains the rationality of this choice in the revised essay.
Point 9: Section 3.4: please include the theoretical assumptions for the application of the least squares method.
Response 9: The theory of least square method is introduced, and the rationality of selecting this method is analyzed.
Point 10: Please discuss the Equation (18).
Response 10: The transfer function obtained is analyzed and its rationality is analyzed.
Section 4 (Optimization of closed loop servo control of FBP)
Point 1: Lines 343-345: please motivate the adopted PID strategy.
Response 1: In the revised essay, the reason and rationality of selecting PID control are introduced.
Point 2: Please better explain Figures 9-10.
Response 2: In the revised essay, some modifications have been made to Figure 10, and two figures have been introduced.
Point 3: Please further detail and explain the design choice of the genetic algorithm and of its optimization problem formulation.
Response 3: In the revised essay, the optimization process of genetic algorithm is described in detail, and its rationality is analyzed.
Point 4: In my opinion, at the end of Section 4, a table reporting the summary of the results with the different techniques used could improve the readability of the paper
Response 4: In the revised essay, the discussion in the last chapter is added, and the list analysis and comparison are made for different stages and different control methods.
Finally, thank you very much for your suggestions on the revision of this article. All the suggestions have been seriously revised and replied. Looking forward to your reply. Giving you the best wishes.
Author Response File: Author Response.docx
Round 2
Reviewer 2 Report
Tha authors implemented the reviewer's suggestions.
In the following, some minor comments are reported.
Line 189 and following lines: the capital letter in the "Charging" word is a typo?
Line 427: please adjust the punctuation.
Author Response
Response to Reviewer 2 Comments
Point 1: Line 189 and following lines: the capital letter in the "Charging" word is a typo?
Response 1: Sorry for the spelling mistake of capitalization in the text, which has been corrected In the revised essay.
Point 2: Line 427: please adjust the punctuation.
Response 2: In the revised essay, already adjust the punctuation.
Finally, thank you very much for your suggestions on the revision of this article. All the suggestions have been seriously revised and replied. Looking forward to your reply. Giving you the best wishes.
Author Response File: Author Response.docx
