Design Method of the Stroke Ring Based on Deformation Pre-Compensation

Round 1

Reviewer 1 Report

Dear Authors,
The article deals with the issue of the design of a multiple-stroke piston motor stroke ring, based on the deformation precompensation. The research was carried out by means of numerical simulations and laboratory experiments.
Regarding the manuscript contents, I have several questions and suggestions that should be addressed:

1. References and introduction: your provided list of 23 references. However, I haven't found any references from Actuators. I suggest you better justify your subject as suitable for this particular journal.

2. Step 1 in lines 136-138: you extremely simplified the model. Can you justify that the simplified model is still adequate?

3. Lines 150-151: you state that the contact surface has been "improved by local encryption". Did you mean the local refinement of the mesh or something else? Moreover, the result in Fig. 3 should be better presented.

4. Mesh validation should be provided.

5. Test bench characteristics: types, ranges, and accuracies of all the used sensors and transducers should be provided.

6. Experimental setup: parameters of the data acquisition system (DAQ), such as sampling period and resolutions of AD/DA converters, should be provided. They are crucial in data acquisition systems of fast-changing dynamic parameters.

7. The uncertainty analysis of the obtained laboratory results is missing.

8. The conclusions are very brief and could be extended. You just repeated the obtained results. However, you should also formulate some more general conclusions coming from your research.

Regards,

Author Response

Thank you for your' comments concerning our manuscript entitled “Design method of the stroke ring based on deformation pre-compensation” (ID: actuators-2788253). Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our research. We have studied comments carefully and have made correction which we hope to meet with approval. Revised portions are marked in red in the paper. The main corrections in the paper and the responds to yours's comments are as flowing:

Comments 1: References and introduction: your provided list of 23 references. However, I haven't found any references from Actuators. I suggest you better justify your subject as suitable for this particular journal.

Response 1: Thank you for pointing this out. We agree with this comment. Therefore, we have added three references ([1], [3], [26]) to this article in the Journal of Actuators. References [1] and [3] are reflected in line 26 of the main text, while references [26] are reflected in line 190 of the main text.

Comments 2: Step 1 in lines 136-138: you extremely simplified the model. Can you justify that the simplified model is still adequate?

Response 2: Thank you for pointing this out. We have made improvements and modifications to the description of the simplified model. The focus of our research is on the deformation of the stroke ring, so the simplified effects of chamfers, fillets, empty slots, etc. on the rotor can be ignored. The revised draft provides detailed explanations on lines 145-149.

Comments 3: Lines 150-151: you state that the contact surface has been "improved by local encryption". Did you mean the local refinement of the mesh or something else? Moreover, the result in Fig. 3 should be better presented.

Response 3: Regarding your question, and the description of mesh validation has been improved and modified to express the encryption process more clearly. What we want to express here is that compared to other components, we have used smaller sizes to mesh the rollers and stroke rings. This is because this study mainly focuses on the deformation of the stroke ring, and the influence of the rotor on it can be ignored. And Figure 3 shows the mesh partitioning results of this motor model. We have made detailed modifications in section 2.2 of the article.

Comments 4: Mesh validation should be provided.

Response 4: Thank you for pointing this out. We have provided mesh independence verification based on your suggestion, and added to lines 173-184 of the text.

Comments 5: Test bench characteristics: types, ranges, and accuracies of all the used sensors and transducers should be provided.

Response 5: Thank you for your suggestions. We have added the composition, model, and error of the test bench to the text. Reflected in lines 252-262 of the text. Among them, data collection is carried out through an integrated universal testing machine, and the model of the extensometer used to measure deformation is YYS-25/5.

Comments 6: Experimental setup: parameters of the data acquisition system (DAQ), such as sampling period and resolutions of AD/DA converters, should be provided. They are crucial in data acquisition systems of fast-changing dynamic parameters.

Response 6: Thank you for your suggestions. We have added the composition, model, and error of the test bench to the text. Among them, the data acquisition system is integrated into the universal testing machine, and the model of the universal testing machine has been described in the text. Reflected in lines 252-262 and Table 3 of the text.

Comments 7: The uncertainty analysis of the obtained laboratory results is missing.

Response 7: Thank you for pointing this out. Based on your suggestion, we have added an uncertainty analysis regarding the experimental results, which is reflected in lines 270-275 of the text.

Comments 8: The conclusions are very brief and could be extended. You just repeated the obtained results. However, you should also formulate some more general conclusions coming from your research.

Response 8: Thank you for pointing this out. We think this is a good suggestion. We have expanded the potential application value of the conclusion and proposed future research directions. Reflected in lines 385-391 of the text.

Reviewer 2 Report

The research focuses on the influence of elastic deformation in the profile of the walking ring on the output characteristics of multiple-stroke piston motors.

The topic is relevant in this field.

This research distinguishes itself by delving into an overlooked aspect of multiple-stroke piston motor design—elastic deformation in the stroke ring curve—and introduces a liquid-solid coupling simulation model to quantify its effects. The proposed curve design method, incorporating elastic deformation pre-compensation, adds a unique dimension to existing literature, offering insights that enhance the alignment between actual working curves and ideal designs, ultimately improving motor performance.

The conclusion is well structured. Gives an overview of the entire research given in the paper.

Figures, schematic are easy to interpret and understand. It is relevant for the research field.

One little lack - name of table 1 has different font, and two dots

Author Response

Thank you for your review of our manuscript titled “Design method of the stroke ring based on deformation pre-compensation” (ID: actuators-2788253). We are very pleased to receive your affirmation, and regarding your suggestions, we have made revisions in the resubmitted manuscript. as follows：

Comments 1: name of table 1 has different font, and two dots

Response 1: We apologize for our carelessness. In our resubmitted manuscript, two points in the names of Table 1 have been modified. Thank you for your correction.

Reviewer 3 Report

The content of this manuscript is enough, but there are still some problems as follows:

(1) The language quality should be improved significantly. For example, the first sentence in the abstract.

(2) In the Figure 3, the mesh quality is too low. Do you make the grid independence？ 

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Author Response

Thank you for your' comments concerning our manuscript entitled “Design method of the stroke ring based on deformation pre-compensation” (ID: actuators-2788253). Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our research. We have studied comments carefully and have made correction which we hope to meet with approval. Revised portions are marked in red in the paper. The main corrections in the paper and the responds to yours’s comments are as flowing:

Comments 1: The language quality should be improved significantly. For example, the first sentence in the abstract.

Response 1: We have tried our best to improve the manuscript and made some changes to the manuscript. These changes will not influence the content and framework of the paper. And the changes have marked in red in the revised paper.

Comments 2: In the Figure 3, the mesh quality is too low. Do you make the grid independence？

Response 2: Thank you for pointing this out. We have added relevant content on grid independence verification, as reflected in lines 173-184 of the article. The reason why Figure 4(Change the original Figure 3 to Figure 4) looks very rough is because a model with relatively sparse grid was chosen to better display the grid emphasis. As mentioned in the text, the rollers and stroke ring are the parts that are heavily encrypted. More precise models are unable to display grid features within a limited image size due to excessively dense grids.

Reviewer 4 Report

The reviewed article deals with the problem of designing the stroke ring in multiple-stroke hydraulic piston motor including optimization of its curve profile . For this purpose, a simulation model of a hydraulic engine with liquid-solid coupling was developed and numerical verification based on strain compensation optimization was carried out to analyze its effect on the pulsation of the output torque of the in multiple-stroke hydraulic piston motor.

The general idea of the article idea is interesting and worth developing in the the future.

The paper is interesting and publishable after small additions:

1.      Page 8/16 chapter 3.2. "Deformation test verification" .  There is no drawing with dimensioned test elements : cylinder and piston assembly.   Their dimensions have a significant influence on the obtained measurement results.

Please suplement

2.      There is no Introduction mention of analogous studies similar in terms of Hydraulic motors and pumps design relating to the impact on these complex issues of other factors such as the compressibility of hydraulic oil.

An example is the article :  

R.Petrovic, J.Pezdirnik, A.Banaszek, L. Durićić, Influence of Compressibility of Working Fluid on Hydrodynamic Processes in The Axial Piston Pump With Combined Distribution/Flow of Working Fluid,      IEEE Xplore , Proceedings of The 2011 International Conference on Fluid Power and Mechatronics FPM 2011, May 17-20, August,2011, Beijing, China  DOI: 10.1109/FPM.2011.6045784

Please make a possible comment in the Introduction about not taking into account the effect of oil compressibility in the theoretical analysis of phenomena performed in the paper, and possibly include the above paper in References.

3.      Page 4/16 Chapter 2.2 "Transient dynamic model:. What is missing from the presented FEM deformation analysis is what types of finite elements were discretized in the FEM numerical model of the engine and how many degrees  of freedom the above FEM numerical model has. Please supplement. The type of finite elements used for the FEM analysis and especially for the analysis of the Contact and deformation phenomenon at the point of contact is important for the accuracy of calculations and possible verification of calculation results.

            This can be seen in the example articles:

Banaszek A, Petrovic R, Zylinski B. Finite element method analysis of pipe material temperature changes influence on line expansion loops in hydraulic installations on modern tankers, Thermal Science 15(1):81-90 January 2011 DOI: 10.2298/TSCI1101081B

Please eventually include the above papers in References.

4.      Page 3/16 Fig. 2 - Force markings ( indexes) and angles illegible. Please improve legibility

5.      Page 6/16 Fig. 4 - Letter markings in blocks ( red color and green color) illegible. Please improve legibility.

6.      Page 8/16 Fig. 7 - Axis markings in "Small diagrams inside" illegible. Please improve legibility

7.      Page 10/16 Fig. 9- Axis markings in "Small diagrams inside" illegible. Please improve legibility

8.      Page 14/16 Fig. 13 - Axis markings in "Small diagrams inside" and descriptions of lines illegible. Please improve legibility

Author Response

Thank you for your' comments concerning our manuscript entitled “Design method of the stroke ring based on deformation pre-compensation” (ID: actuators-2788253). Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our research. We have studied comments carefully and have made correction which we hope to meet with approval. Revised portions are marked in red in the paper. The main corrections in the paper and the responds to yours's comments are as flowing:

Comments 1: Page 8/16 chapter 3.2. "Deformation test verification". There is no drawing with dimensioned test elements: cylinder and piston assembly. Their dimensions have a significant influence on the obtained measurement results.

Response 1: Thank you for pointing this out. We have added the size values of the test piece in the text, as reflected in lines 267-269 and Table 4.

Comments 2: There is no Introduction mention of analogous studies similar in terms of Hydraulic motors and pumps design relating to the impact on these complex issues of other factors such as the compressibility of hydraulic oil.

An example is the article:

R.Petrovic, J.Pezdirnik, A.Banaszek, L. Durićić, Influence of Compressibility of Working Fluid on Hydrodynamic Processes in The Axial Piston Pump With Combined Distribution/Flow of Working Fluid, IEEE Xplore, Proceedings of The 2011 International Conference on Fluid Power and Mechatronics FPM 2011, May 17-20, August,2011, Beijing, China DOI:10.1109/FPM.2011.6045784

Please make a possible comment in the Introduction about not taking into account the effect of oil compressibility in the theoretical analysis of phenomena performed in the paper, and possibly include the above paper in References.

Response 2: Thank you for pointing this out. We have added a statement in the introduction that oil compressibility can also have an impact and have cited the article. Reflected in lines 72 - 74 of the text.

Comments 3: Page 4/16 Chapter 2.2 "Transient dynamic model: What is missing from the presented FEM deformation analysis is what types of finite elements were discretized in the FEM numerical model of the engine and how many degrees of freedom the above FEM numerical model has. Please supplement. The type of finite elements used for the FEM analysis and especially for the analysis of the Contact and deformation phenomenon at the point of contact is important for the accuracy of calculations and possible verification of calculation results.

This can be seen in the example articles:

Banaszek A, Petrovic R, Zylinski B. Finite element method analysis of pipe material temperature changes influence on line expansion loops in hydraulic installations on modern tankers, Thermal Science 15(1):81-90 January 2011 DOI: 10.2298/TSCI1101081B

Please eventually include the above papers in References.

Response 3: Thank you for pointing this out. The description of mesh division types and constraints for each part has been modified and improved in the article, and the setting conditions for contacts, solvers, etc. have also been supplemented. Reflected in lines 145-182 of the text and cited your recommended article in line 143.

Comments 4: Page 3/16 Fig. 2 - Force markings (indexes) and angles illegible. Please improve legibility.

Response 4: Thank you for mentioning the suggestion. We have redrawn Figure 2. On line 95 of the resubmitted manuscript.

Comments 5: Page 6/16 Fig. 4 - Letter markings in blocks (red color and green color) illegible. Please improve legibility.

Response 5: We think this is an excellent suggestion. We have changed the color of the letter markings in the figure. And due to the insertion of two new images in the text, the original image number 4 was changed to 6. Reflected in line 203 of the text.

Comments 6: Page 8/16 Fig. 7 - Axis markings in "Small diagrams inside" illegible. Please improve legibility.

Response 6: We fully agree with your suggestion. And the axis markers of the "internal small image" in the figure were enlarged and bolded. Revised to Figure 9, on line 238 of the text.

Comments 7: Page 10/16 Fig. 9- Axis markings in "Small diagrams inside" illegible. Please improve legibility.

Response 7: Thank you for your suggestions. And the axis markers of the " Small diagrams inside " in the figure were enlarged and bolded. Revised to Figure 11, on line 294 of the text.

Comments 8: Page 14/16 Fig. 13 - Axis markings in "Small diagrams inside" and descriptions of lines illegible. Please improve legibility.

Response 8: We have made bold and enlarged the axis markings and lines of the " Small diagrams inside " based on your suggestion, improving readability. Revised to Figure 15, line 347 of the text.

Round 2

Reviewer 1 Report

Dear Authors
You made the suggested amendments.
My recommendation is to accept the manuscript.
Best Regards,

Reviewer 3 Report

It's OK.

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