A Study on the Efficiency in the Energy Harvesting Device Using Resonance of Pendulum
Round 1
Reviewer 1 Report
1- The abstract needs more interest and rewriting some paragraphs.
2- There are still some aspects that can be improved (for grammar and punctuations). Improve the technical writing of your paper, where there are several grammatical errors and spelling I think they need to be checked out.
3- The conclusion needs more efforts to elaborate the achieved results with respect to the future work,
4- The practical part is very important,
5- Future work is an important part of the conclusion.
6- There is several relative works to energy harvesting, I wish to discuss. Some following references are good for your paper I think if you wish to consider:
A- “Further realization of a flexible metamaterial based antenna on indium nickel oxide polymerized palm fiber substrates for RF energy harvesting”, International Journal of Microwave and Wireless Technologies, Cambridge, Volume 5, issue 4, pp. 1-9, May 2020,
B- “Novel miniaturized folded UWB microstrip antenna-based metamaterial for RF energy harvesting,” International Journal of Communication Systems, Volume 1, issue 2, January 2020,
C- “Hilbert Metamaterial Printed Antenna based on Organic Substrates for Energy Harvesting”, IET Microwaves, Antennas & Propagation, volume 12, number 4, pp.1-8, June 2019,
D- “Novel UWB Printed Metamaterial Microstrip Antenna based Organic Substrates for RF-Energy Harvesting Applications,” AEU - International Journal of Electronics and Communications, volume 101, pp. 1-10, January, 2019,
E- Metamaterial Vivaldi Printed Circuit Antenna Based Solar Panel for Self-Powered Wireless Systems. Progress In Electromagnetics Research M, 102, 181-192,
F- "Solar Panel Integrated 3D MIMO Antenna Array for Modern Communication Systems," 2021 International Conference on Advanced Computer Applications (ACA), 2021, pp. 112-115, doi: 10.1109/ACA52198.2021.9626802.
I loved this work and I feel it is very good. I hope these comments would help you improve this work after a major revision.
Regards
Author Response
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Author Response File: 
Author Response.docx
Reviewer 2 Report
This paper, gives the results of numerical analysis to calculate the efficiency of an energy harvesting generator using the pendulum. Improved mathematical model for designing a energy harvesting generator was derived, and efficiency map of the generator according to the geometric parameter of pendulum. The potential energy of the pendulum was expressed as the power generation amount of the pendulum from the power angle. All design variables that affect the electrical performance of the generator were described. The impact of the design quantities on the efficiency of the energy harvesting generator has been verified by the efficiency map according to the geometrical parameters of pendulum. The following revisions are required to improve the paper.
1- The style of references should be corrected. ( Michal Marszal et al. [12] proposed a pendulum resonance..... wrong style)
2-Check for spelling and grammatical errors. (gen-eration)
3-Although the main starting point of the study is quite interesting, I would like to regret that the mathematical background in the study is not sufficient for a journal within the scope of SCI.
4-If a generator design that validates the proposed mathematical approach is made and supported by experiments, the study will become publishable.
Author Response
Please see the attachment.
Author Response File: Author Response.docx
Reviewer 3 Report
Comments for author File: 
Comments.pdf
Author Response
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Author Response File: Author Response.docx
Round 2
Reviewer 1 Report
I think the authors did everything well. The paper can be accepted in it's current form.
Regards
Author Response
Thank you very much for your great advice.
Reviewer 2 Report
Dear Authors,
I appreciate that this work addresses a new issue for the calculation of efficiency of a pendulum generator according to design variables. I can also understand that the study focused on introducing the generator efficiency derivation process rather than specific mathematical developments. But I don't find the derivation of the equation of motion presented in the paper from the Lagrangian equation and the solution of the equation of motion novel enough. I am not convinced that this paper is sufficient for publication under the SCI unless supported by experiments.
Author Response
Dear reviewer,
In engineering research area, there are numerous publications demonstrating new founding without experimental results. It that cases, analytical or numerical approaches and results from those methods are sufficient enough to prove what authors are trying to demonstrate. This study also, as far as authors believe, the facts that the efficiency of a pendulum type generator can be greatly affected by design parameters, which is new founding of this paper, are explicitly proved through analytical methods. It would be more agreed if reviewer could point out if there are some parts needed to be proved only by experiment.
First of all, derivation of the motion and calculation of time t which is the time duration to reach certain degree α is not that simple. It required numerous efforts and time to drive those solutions to prove what authors made assumptions at the early stage of this study. Besides of that, this study is not focused to show a new mathematical theory nor a new theoretical founding. This study newly introduced on the efficiency of generator systems especially using vibration resonance and explicitly showed the impact of design parameters to the efficiency as the reviewer agreed. As the corresponding author published numerous papers on the noise and vibration area, it is hardly seen saying a paper is not acceptable even though the paper addresses new issue. Therefore, authors would like to ask with respect reconsidering based on our explanations here.
