Modeling and Analysis of Internal Leakage Characteristics of the Internal Curve Motor by a CFD-Based Method
, Guixiang Bai 1, Chuanchuan Cao 1,3 and Shoupeng Song 1,4Round 1
Reviewer 1 Report
Comments and Suggestions for Authors1, The authors can explain a type of DAQ system used for recording the experimental data and at what sampling frequency ?
2. The authors has mentioned about the test speed of 1 rpm in section 2.1, What kind of loading pump has been used for the experimental test bench and has the authors used the gearbox in between hydro-motor and loading pump to increase the rotational speed of loading pump?
3. In the section 3.5.1, the values of parameters used in numerical calculations can be provided in the tabular format alongwith units, this will help readers for quick reference of the parameters?
4. Also provide the parameters for the each section separately i.e. section 3.5.1 and section 3.5.2 ?
5. What applications can be the use case for hydro-motors operating at 1 rpm? This can be added in the introduction part as motivation or if this rpm is chosen to validate the model than authors can write about limitation of existing model at higher speed of operation.
Author Response
Comment 1: The authors can explain a type of DAQ system used for recording the experimental data and at Suggestions for Authors what sampling frequency ?
Response 1: Thank you for taking the time to review our manuscript, which used a Siemens S7-1200 PLC for data acquisition. Sensors measuring temperature, pressure, flow rate, and rotational speed transmit analog signals to the PLC, which converts them into digital signals for display and recording using an upper-computer program. The PLC’s data sampling frequency is set to 1 kHz.
Comment 2: The authors has mentioned about the test speed of 1 rpm in section 2.1,What kind of loading pump has been used for the experimental test bench and has the authors used the gearbox in between hydro-motor and loading pump to increase the rotational speed of loading pump?
Response 2:Thank you for the great review. Low-speed is an excellent performance characteristic of the internal curve motor, and the minimum speed of the test motor can be lower than 1 m. To reduce the effect of too low a speed on the internal leakage, the minimum test speed of the motor was set to 1 RPM in this study. The loading pump of the test bench was an internal curve motor with the same displacement as the test motor, and the outlet pressure of the loading pump was controlled by the speed regulator valve in the bridge rectifier circuit, which constrained the test motor speed. This eliminates the need for a gearbox between the test motor and loading pump.
Comment 3: In the section 3.5.1,the values of parameters used in numerical calculations can be provided in the tabular format along with units, this will help readers for quick reference of the parameters?
Response 3:We have carefully revised the manuscript and thank you for your consideration. In Section 3.5, we provide a table of the values and units for the parameters used in the numerical calculations.This can be found in the revised version of the manuscript from Table 1.
Comment 4:Also provide the parameters for the each section separately i.e. section 3.5.1 and section 3.5.2?
Response 4:Thank you for your constructive comment on our manuscript. We provide a table of parameter values and units used in numerical calculations in Section 3.5 to solve this problem.This can be found in the revised version of the manuscript from Table 1.
Comment 5: What applications can be the use case for hydro-motors operating at 1 rpm? This can be added in the introduction part as motivation or if this rpm is chosen to validate the model than authors can write about limitation of existing model at higher speed of operation.
Response 5: Thank you for your valuable comment, which have made our manuscript even better; the low-speed operation of the internal curve motor 1rpm is used in applications such as commutation of large industrial machine tools and excavation machinery, and we have added the problem of the low-speed presence of the internal curve motor in the “Introduction”, which can be found in the revised version of the manuscript from lines 32 to 33.
Reviewer 2 Report
Comments and Suggestions for AuthorsIn this manuscript, modeling and analysis of internal leakage characteristics of the internal curve motor by a CFD-based method is presented. The reviewer has a few concerns that the authors may consider.
1. Please double check and ensure that all the variables are properly defined in the annotations after their first appearance in equations. The full names should be given before abbreviations when first appearing in the Abstract and the main text, for example CFD, Eq. (1).
2. The computational complexity of a multi-factor working condition as compared to one-factor should be discussed.
3. The literature review section should be enriched to include internal leakage fault applied to hydraulic system such as "Actuator Fault-Tolerant Control for an Electro-Hydraulic Actuator Using Time Delay Estimation and Feedback Linearization".
4. The future works should be indicated in the conclusion.
5. The internal leakage in the test platform in Figure 2 should be remarked.
Comments on the Quality of English LanguageThe English could be improved to more clearly express the research.
Author Response
Comment 1: Please double check and ensure that all the variables are properly defined in the annotations after their first appearance in equations. The full names should be given before abbreviations when first appearing in the Abstract and the main text, for example CFD,Eq(1).
Response 1:Thank you for your valuable suggestions on our manuscript. We have made detailed changes to address your concern. We have refined the definitions of the variables in the formulas and corrected abbreviations in the summary and text.
Comment 2: The computational complexity of a multi-factor working condition as compared to one-factor should be discussed.
Response 2:Thank you for your professional review and valuable comment on our manuscript. One factor analysis, under the assumption that other factors remain unchanged, analyzes the effect of a change in one factor on the internal leakage of the internal curve motor , and determines the order and degree of factors affecting the internal leakage. Multifactor analysis investigates the effect of a change in the two factors on the internal leakage of the internal curve motor and reveals the interactions between the factors. However, the multi-factor analysis method, using ANOVA, requires numerous tests and data collection, is computationally intensive, and adds complexity to the analysis, but yields more comprehensive and detailed results compared to the one-factor approach.This can be found in the revised version of the manuscript from lines 307 to 315 .
Comment 3:The literature review section should be enriched to include internal leakage fault applied to hydraulic system such as "Actuator Fault-Tolerant Control for an Electro-Hydraulic Actuator Using Time Delay Estimation and Feedback Linearization".
Response 3: Thank you for your valuable suggestions! We have added your revisions to our paper and updated the references. This can be found in the revised version of the manuscript from lines 113 to 115 and from lines 613 to 614.
Comment 4:The future works should be indicated in the conclusion.
Response 4:Thank you for your kind comment to improve our manuscript. In our future work, based on the internal leakage characteristics of the internal curve motor and the conclusions of this study, we will study in depth the suitability of the floating flow distribution structure and the applicability of the valve pair, and ultimately achieve the goal of reducing the internal leakage and improving the performance of the internal curve motor . This can be found in the revised version of the manuscript from lines 535 to 539.
Comment 5:The internal leakage in the test platform in Figure 2 should be remarked.
Response 5: Thank you for your good comment. We have remarked the location of the internal leakage in Figure 2.
Comments on the Quality of English Language
Comment : The English could be improved to more clearly express the research.
Response : Thank you very much for your comment, which have been very helpful in refining our manuscript. After careful examination, we found many grammatical and sentence errors and made linguistic changes in the manuscript. In addition,we invited a native English teacher to help us revise the grammar and sentences, hoping that the revised paper will be clearer and more accurate in presentation.
Round 2
Reviewer 2 Report
Comments and Suggestions for AuthorsThe revised paper has thoroughly addressed all the questions raised. I have no further concerns, and I recommend that this paper be accepted for publication in Processes Journal.
