Design of Hydrostatic Power Shift Compound Drive System for Cotton Picker Experiment
, Meng Wang 1,2, Xiangdong Ni 1,2,*, Wenqing Cai 3, Chunfa Zhong 1,2, Haoyun Ye 1,2, Yongqiang Zhao 1,2, Wenlong Pan 1,2 and Yuangang Lin 1,2
Round 1
Reviewer 1 Report
1. This paper introduces the hydraulic machinery of transmission composition principle, provides the calculation method of transmission parameters, and verifies its rationality by simulation and test.
2. Because of the different driving radius and driving resistance and slip rate, the drive torque and drive speed are not consistent, and the author did not reflect the due differences in the simulation and test.
3. In the engine power select, the power of the cotton-harvesting system should be included.
4. Because there is actually a large slip rate in the field operation, the author did not consider the difference in slip rate in the simulation, but the error between the speed test and the simulation result is less than 1%, which is not high credibility.
5. For the composite transmission, the author should carry out the theoretical analysis and test verification of the transmission efficiency.
6.What parameter is Fj in formula (3)?
7. In most speed and torque areas, the efficiency of the pump and motor is below 0.95, and in equation (9), the efficiency value is 0.95, which is too high.
Line 252-266, there is a content error.
Author Response
Response to Reviewer 1 Comments
Point 1: This paper introduces the hydraulic machinery of transmission composition principle, provides the calculation method of transmission parameters, and verifies its rationality by simulation and test.
Response 1: Thanks to the expert's careful reading, the full text has been carefully checked and revised, and the text changes have been marked using the "Track Changes" function inside word.
Point 2: Because of the different driving radius and driving resistance and slip rate, the drive torque and drive speed are not consistent, and the author did not reflect the due differences in the simulation and test.
Response 2: In table 5 set in the front drive, rear drive motor displacement, front and rear wheel diameter, and wheel side reducer transmission ratio parameters are differences, and the power from the engine to the two motors through the front and rear axle distribution to the wheels, the angular speed remains the same and synchronization, then the speed automatically matched, so in the whole machine driving simulation and test mentioned in the difference is not obvious.
Point 3: In the engine power select, the power of the cotton-harvesting system should be included.
Response 3: This study actually considered the harvesting system picking power (was ignored in the text), now the text has been added to the corresponding content and inserted a citation to supplement.
Point 4: Because there is actually a large slip rate in the field operation, the author did not consider the difference in slip rate in the simulation, but the error between the speed test and the simulation result is less than 1%, which is not high credibility.
Response 4: This test was carried out straight line driving speed test, no lateral slip, while it was measured on dry ground, the wheels almost did not appear longitudinal slip, so the effect of slip rate is neglected in the comprehensive consideration case.
Point 5: For the composite transmission, the author should carry out the theoretical analysis and test verification of the transmission efficiency.
Response 5: The composite transmission mentioned in this paper, mainly for the design of driving system design, selection to the final speed and design verification. However, the theoretical analysis and experimental verification of the transmission efficiency are not the focus of this paper, while the impact on the design and testing of the walking composite drive system in the paper can be ignored.
Point 6: What parameter is Fj in formula (3)?
Response 6: The manuscript’s statement was incorrect in formula (3). Its intended meaning was to represent the Fk formula (supplementing the preceding formula). It has now been revised, and the corresponding content and explanations for the Fk formula have been added to the manuscript.
Point 7: In most speed and torque areas, the efficiency of the pump and motor is below 0.95, and in equation (9), the efficiency value is 0.95, which is too high.
Response 7: In the mentioned three instances in this article where efficiency is specified as 0.95:
（1）In equation (8), ηfd represents the efficiency of the fan drive system using a belt transmission, which is set at 0.95. This value is reasonable because belt transmission efficiencies typically range from 0.9 to 0.99.
（2）In the second instance of equation (9), η2 represents the gear transmission efficiency between the motor and the driving wheel. It has indeed been revised to a lower value of 0.8, taking into account the losses in intermediate transmissions. The correct calculation is the product of the efficiency of the gear set between the motor and the gearbox, the efficiency of the intermediate gearbox, and the efficiency of the wheel-side reducer.
（3）The third instance of 0.95 efficiency refers to the volumetric efficiency of the pump motor. Values for pump motor volumetric efficiency typically exceed 0.95, so taking 0.95 is reasonable.
Comments on the Quality of English Language：
“Line 252-266, there is a content error. ”
Response：I have now deleted the content of lines 252-266, which was mistakenly included in the translation.
Reviewer 2 Report
The manuscript presents a hydrostatic power shift compound chassis drive system for cotton pickers, combining theory and simulation, and verifying the feasibility and applicability of the design through experimental testing and analysis, the work is novel and the subject is interesting, but more attention to detail should be paid.
1. The “M” of “HCD Mode” in line 278 should be lowercase, i.e. “Mode” should be changed to “mode”.
2. Line 250 and 406 should be formatted to align the text.
3. Figure 8, "rear drive motor" line color distinction is not clear, suggest to modify.
4. Speed test section suggested providing test time and location.
5. The characters in the schematic diagram of Figure 10 should be explained.
6. ∆t in Equation 13 is suggested to correspond to t1 and t2 in Figure 10.
7. 1% relative error description in the conclusion section is suggested to be consistent with 0.588% inside the analysis.
Minor editing of English language required.
Author Response
Thanks to the expert's careful reading, the full text has been carefully checked and revised, and the text changes have been marked using the "Track Changes" function inside word.
Point 1: The “M” of “HCD Mode” in line 278 should be lowercase, i.e. “Mode” should be changed to “mode”.
Response 1: The “M” of “HCD Mode” in line 278 have been lowercase.
Point 2: Line 250 and 406 should be formatted to align the text.
Response 2: Line 250 (Table 4. Variable Pump Model Parameter Table.) and line 406 have been aligned, in addition, the tertiary headings of chapters 3 and 4 have been changed to the correct alignment format.
Point 3: Figure 8, "rear drive motor" line color distinction is not clear, suggest to modify.
Response 3: The line color in Figure 8 has been changed and the figure has been redrawn.
Point 4: Speed test section suggested providing test time and location.
Response 4: Speed test time and location information has been added.
Point 5: The characters in the schematic diagram of Figure 10 should be explained.
Response 5: The characters in the schematic diagram of Figure 10 have been added for explanation.
Point 6: ∆t in in Figure 10 (It has been changed to Equation 13 in the revised version ) is suggested to correspond to t1 and t2 in Figure 10.
Response 6: ∆t in Equation 13 has been corresponded to t0 and t1 in Figure 10.
Point 7: 1% relative error description in the conclusion section is suggested to be consistent with 0.588% inside the analysis.
Response 7: The relative error described in the conclusion section has been modified to be consistent with the analysis, both expressed as 0.588%.
In addition, the English expression and description of the article have been modified, which has been traced and displayed in the manuscript.
