Smart Structures Innovations Using Robust Control Methods

Comments from Reviewer 1

Answers of the Authors

My main comments to the authors:

- The Introduction section is boring and needs to be  more generalized and extended, where by the end it should contain the manuscript ordered sections.

The authors would like to thank the Reviewer for the kind words, the constructive comments, and the effort toward the completeness of our work. The authors hope that we have met the Reviewer’s standards and that the Reviewer will find the revised version of the manuscript improved according to the proposed, comments, and instructions.

-  You need to more focus on the paper novelty and contributions.

The authors would like to thank the reviewer for the comment. The novelty of the study is now more clearly presented in the revised version of the manuscript.

More specifically, in the introduction section is was added:

This work has provided many innovations in the suppression of oscillations with the application of smart materials:

1.       With the help of advanced control techniques such as the Hinfinity Control, the reduction of oscillations is achieved even for changes in the mass and stiffness of the original model that is presented for modeling uncertainties.

2.         By demonstrating the use of Hinfinity control in both the state space and frequency domain, the essay explores the benefits of robust control in intelligent structures. It takes into consideration a dynamic model for intelligent constructions subject to excitations induced by the wind.

3.       The Hinfinity robust controller solves the dynamical system uncertainties and the partial data measurements to make possible the design.  The effectiveness of the suggested strategies to reduce vibrations in piezoelectric smart structures is demonstrated by numerical simulations. The strategy guarantees a thorough and unified process for creating and verifying reliable control systems.

4.       The Hinfinity robust controller aids in the creation of intelligent structures by taking into account dynamical system uncertainties and partial data.

5.       Notably, advances in intelligent structures with advanced control methods are well demonstrated.

- Please revise the equations numbering to be in order.

The authors would like to thank the reviewer for the comment. The equations numbering is corrected in the revised version of the manuscript.

- Please revise the font size to be fixed for whole the manuscript.

The authors would like to thank the reviewer for the comment. The font size is corrected in the revised version of the manuscript.

- Please revise the references numbering because they should appear in order.

The authors would like to thank the reviewer for the comment. The references numbering is corrected in the revised version of the manuscript.

- In the Results section, you need to compare your obtained results due using this robustness type of controller with other different types from literature to measure the  added value of your controller.

The authors would like to thank the reviewer for the comment. In the results section the obtained results of the research are compared with the literature, as instructed, in the revised version of the manuscript. More specifically, it was added:

This advanced control technique takes into account modeling uncertainties that correspond to construction imperfections or smears likely to be generated during oscillation. The problem of this control technique is the optimal selection of the weights resulting from optimization methods.

- Please, reformulate the conclusion section to be more clarified.

The authors would like to thank the reviewer for the comment. The conclusions section is now revised to be more, as instructed. Thank you.

Comments on the Quality of English Language

 Moderate editing of English language required

The authors would like to thank the reviewer for the comment. The English language is checked and improved throughout the manuscript in the revised version. The authors hope that the language is compatible now with the reviewer’s standards. Thank you.

Comments from Reviewer 2

Answers of the Authors

Recommending to Authors writing parameters and variables in italics, in equations and text, according to Standards ISO 80000 series, for better transparency and reading experience.

Also using unit symbols according to SI units system, namely "s" for second. 

The authors would like to thank the Reviewer for the kind words, the constructive comments, and the effort toward the completeness of our work. The authors hope that we have met the Reviewer’s standards and that the Reviewer will find the revised version of the manuscript improved according to the proposed, comments, and instructions.

The authors would like to thank the reviewer for the comment. The writing parameters and variables were corrected in the revised version of the manuscript.

Comments from Reviewer 3

Answers of the Authors

This is interesting theoretical paper. It reports the utilization robust control theory in order to effectively mitigate structural oscillations in smart structures. While modeling the structures, two-dimensional finite elements are used to account for system uncertainty. Advanced control methods are used to completely reduce vibration. Complete vibration suppression is achieved using advanced control techniques. This approach enhances the robustness of the control system, allowing it to better handle uncertainties and disturbances while achieving desired performance objectives. The obtained theoretical results are reliable without any doubts. However, I have some addition only after implementation of which the paper can be recommended to publication:

The authors would like to thank the Reviewer for the kind words, the constructive comments, and the effort toward the completeness of our work. The authors hope that we have met the Reviewer’s standards and that the Reviewer will find the revised version of the manuscript improved according to the proposed, comments, and instructions.

1.      The authors should provide in 1. Introduction concrete examples of solving optimization problems:

(1). V.A. Turchenko, S.V. Trukhanov, V.G. Kostishin, F. Damay, F. Porcher, D.S. Klygach, M.G. Vakhitov, D. Lyakhov, D. Michels, B. Bozzo, I. Fina, M.A. Almessiere, Y. Slimani, A. Baykal, D. Zhou, A.V. Trukhanov, Features of structure, magnetic state and electrodynamic performance of SrFe12-xInxO19, Sci. Rep. 11 (2021) 18342. https://doi.org/10.1038/s41598-021-97684-8.

(2). M.A. Almessiere, Y. Slimani, N.A. Algarou, M.G. Vakhitov, D.S. Klygach, A. Baykal, T.I. Zubar, S.V. Trukhanov, A.V. Trukhanov, H. Attia, M. Sertkol, I.A. Auwal, Tuning the structure, magnetic and high frequency properties of Sc-doped Sr0.5Ba0.5ScxFe12-xO19/NiFe2O4 hard/soft nanocomposites, Adv. Electr. Mater. (2022) 01124. https://doi.org/10.1002/aelm.202101124.

The authors would like to thank the reviewer for the comment. The studies mentioned by the reviewer are now considered and cited in the revised version of the manuscript. Thank you.

2.      The authors should provide in 1. Introduction concrete examples of composite materials promising for practical applications:

(3). A.L. Kozlovskiy, D.I. Shlimas, M.V. Zdorovets, Synthesis, structural properties and shielding efficiency of glasses based on TeO2-(1-x)ZnO-xSm2O3, J. Mater. Sci.: Mater. Electron. 32 (2021) 12111-12120. https://doi.org/10.1007/s10854-021-05839-0.

(4). S.A. Khan, I. Ali, A. Hussain, H.M.A. Javed, V.A. Turchenko, A.V. Trukhanov, S.V. Trukhanov, Synthesis and characterization of composites with Y-hexaferrites for electromagnetic interference shielding applications, Magnetochem. 8 (2022) 186. https://doi.org/10.3390/magnetochemistry8120186.

3.      The proposed 4 papers should be inserted in References.

The paper should be sent to me for the second analysis after the moderate revisions.

The authors would like to thank the reviewer for the comment. The studies mentioned by the reviewer are now considered and cited in the revised version of the manuscript. Thank you.