Active Vibration Suppression of Stiffened Composite Panels with Piezoelectric Materials under Blast Loads
Round 1
Reviewer 1 Report
Dear Authors,
I give my advice to publish the paper with minor revisions as provided.
Best Regards.
Comments for author File: 
Comments.pdf
Author Response
December 20, 2019
Dear Editor of Applied Sciences
Thanks a lot for comments on applsci-669772.
Authors completely improve the quality of this work based on not only the reviewer’s valuable suggestions but also check again all portions of the manuscript.
Then, “response to reviewer’s comments” are summarized points by points, and authors improved the original version as indicated in red.
For more comments or questions on this manuscript, do not hesitate to contact us.
Thank you once again.
Professor Chang-Yull Lee
Department of Aerospace Engineering,
Chosun University, South Korea
Response to Reviewer 1 Comments
Thanks for valuable suggestions to improve the quality of the manuscript.
I can give my advice to publish the paper entitled “Active Vibration Suppression of Stiffened Composite Panels with Piezoelectric Materials under Blast Loads” with minor revisions as given below.
Point 1:
Abstract
- Can the authors also mention the explicit form of PZT? Its first occurrence is in line 15.
Response 1: Thanks for your advice. Authors added the explicit form of PZT as “lead zirconate titanate”.
Point 2:
Introduction- The reference in line 49 should be corrected as “Turkmen and Mecitoglu [10]”.
- In line 64, I think, “blast roads” should be corrected as “blast loads”.
Response 2: Thank you for your kind mention. They were mistyped and corrected.
Point 3:
Stiffened Laminated Panel with Piezoelectric Materials- Are the piezo layers shown in Fig. 1 single or multi- layers? I recommend that more details can be given in here.
Response 3: According to the reviewer’s comment, Authors added the sentence.
“In addition, the sensor and actuator layers are designed as a single layer.”
Point 4:
2.1. Finite Element Formulations
- In line 80, Can the authors mention where does the kth layer belong to? Does it include piezo layers too?
Response 4: Piezo layers does not belong to kth layer. For the readers, authors added the reference [15]. Thank you.
Point 5: Can the authors mention subscript a in Eq. (7)?
Response 5: According to the reviewer’s comment, authors added the sentence. “where and are the thickness of the actuator and the electric potential of the actuator, respectively.”
Point 6: Can the authors mention V in Eq. (9)? Does it strain energy shown in Eq. (10)?
Response 6: Thank you for your advice. Vxs in Eq. (9) and Ve in Eq. (10) are different. In order to show the meaning clearly, authors added some mentions and the formulations in detail.
Thank you again.
If you have additional comments or questions for this manuscript, do not hesitate to inform authors as soon as possible.
Best regards,
Chang-Yull Lee
Author Response File: 
Author Response.docx
Reviewer 2 Report
The paper in general looks interesting and fits well the submitted journal. The current results look fine and as a result the paper could be accepted for publication. However, the authors are required to revise the manuscript by addressing the following issues.
The first order shear deformation plate theory is used in the study. This traditional theory owns several limitations and I am surprised about the good results. New and improved FSDT have been developed and introduced in the literature, the new theory goes beyond the limitations of the traditional one, therefore, it must be introduced in the paper, for instance, compos struct 2014, 118:121-138;
it is not clear about the nonlinear solver used in the paper, and how the parameters of the numerical time discretization algorithm affect the response.
The FEM is used as the main tool in the analysis, other approaches such as meshfree, eng. struct 2013, 47:90-104should be introduced
The similarities and differences of this work in comparison with other existing ones should be presented.
Major revision should be made.
Author Response
December 20, 2019
Dear Editor of Applied Sciences
Thanks a lot for comments on applsci-669772.
Authors completely improve the quality of this work based on not only the reviewer’s valuable suggestions but also check again all portions of the manuscript.
Then, “response to reviewer’s comments” are summarized points by points, and authors improved the original version as indicated in red.
For more comments or questions on this manuscript, do not hesitate to contact us.
Thank you once again.
Professor Chang-Yull Lee
Department of Aerospace Engineering,
Chosun University, South Korea
Response to Reviewer 2 Comments
Thanks for valuable suggestions to improve the quality of the manuscript.
The paper in general looks interesting and fits well the submitted journal. The current results look fine and as a result the paper could be accepted for publication. However, the authors are required to revise the manuscript by addressing the following issues.
Point 1: The first order shear deformation plate theory is used in the study. This traditional theory owns several limitations and I am surprised about the good results. New and improved FSDT have been developed and introduced in the literature, the new theory goes beyond the limitations of the traditional one, therefore, it must be introduced in the paper, for instance, compos struct 2014, 118:121-138;
Response 1: Thanks for your valuable advice. However, this research is not a paper on the FEM technique. Authors are really sorry but we could not find a suitable place to introduce the paper. Authors will introduce the recommended paper next time.
Point 2: it is not clear about the nonlinear solver used in the paper, and how the parameters of the numerical time discretization algorithm affect the response.
Response 2: Thank you again for reviewer’s thoughtful care. According to the reviewer’s suggestion, authors added some mentions and the formulation (17)-(22) in detail.
Point 3: The FEM is used as the main tool in the analysis, other approaches such as meshfree, eng. struct 2013, 47:90-104should be introduced
Response 3: Thanks for your comment. However, FEM technique is not an important issue in this paper. Authors are so sorry but we could not find a suitable place to introduce the paper. Authors will introduce the recommended paper next time. Thank you again.
Point 4: The similarities and differences of this work in comparison with other existing ones should be presented.
Response 4: Thanks for valuable advice. Blast Loads can be a very important issue in aircraft industry. Limitations of the existing research are presented, and the contribution or motivation of this paper is also added as follows.
“Though numerous researches on piezoelectric stiffened models have been performed widely up to now, research to suppress the vibrations of stiffened models caused by aerodynamic flows such as blast loads has been studied in a limited range. In other word, many studies has been focused on damages of the structures. Therefore, active vibration suppression of piezoelectric stiffened laminated panels are studied subjected to normal blast wave in this paper. Due to the characteristics of piezoelectric materials as fast responses, the vibration behaviors of stiffened composite panels could be controlled easily by piezoelectric actuators under a blast loading. A stiffened panel with piezoelectric effect is formulated using finite element method.”
“In aircraft vehicles, there are many skins with an array of stiffening ribs in the wings and fuselage. These structures have been widely used because of their light weight and ability to withstand dynamic loads. In most cases, the catastrophic disaster of the air vehicles was due to the failure of the fuselage under blast loads. The overpressure of the blast loading generated typically acts during few milliseconds. Thus, active vibration control of stiffened composite structures is an important problem. In this regard,~~~”
Thank you again,
If you have additional comments or questions for this manuscript, do not hesitate to inform authors as soon as possible.
Best regards,
Chang-Yull Lee
Author Response File: Author Response.docx
Reviewer 3 Report
Main Contribution: The authors presents vibration suppression control of stiffened model with piezoelectric sensors and actuators under blast loads. Two models was obtained using LQR control algorithm under uniformly distributed blast loads. Three cases were compared with the literature's.
Major Findings: The most effective position of piezoelectric patches with settling time have maximum responses. Presented analysis could be easily applied to various types of models.
Strengths: The finite element formulations and piezoelectric materials were described in detail and clearly. The numerical paradigms were also clearly described and demonstrated.
Weakness: The difficulties/disadvantages of the cited research was not clear. The novelty of this manuscript was not clearly written. The numerical result was mainly compared with the literature's.
Author Response
December 20, 2019
Dear Editor of Applied Sciences
Thanks a lot for comments on applsci-669772.
Authors completely improve the quality of this work based on not only the reviewer’s valuable suggestions but also check again all portions of the manuscript.
Then, “response to reviewer’s comments” are summarized points by points, and authors improved the original version as indicated in red.
For more comments or questions on this manuscript, do not hesitate to contact us.
Thank you once again.
Professor Chang-Yull Lee
Department of Aerospace Engineering,
Chosun University, South Korea
Response to Reviewer 3 Comments
Thanks for valuable suggestions to improve the quality of the manuscript.
Main Contribution: The authors presents vibration suppression control of stiffened model with piezoelectric sensors and actuators under blast loads. Two models was obtained using LQR control algorithm under uniformly distributed blast loads. Three cases were compared with the literature's.
Major Findings: The most effective position of piezoelectric patches with settling time have maximum responses. Presented analysis could be easily applied to various types of models.
Strengths: The finite element formulations and piezoelectric materials were described in detail and clearly. The numerical paradigms were also clearly described and demonstrated.
Point: Weakness: The difficulties/disadvantages of the cited research was not clear. The novelty of this manuscript was not clearly written. The numerical result was mainly compared with the literature's.
Response: Thanks for valuable advice. Blast Loads can be a very important issue in aircraft industry. Disadvantages of the cited research are presented and the contribution of this paper is also added as follows.
“Though numerous researches on piezoelectric stiffened models have been performed widely up to now, research to suppress the vibrations of stiffened models caused by aerodynamic flows such as blast loads has been studied in a limited range. In other word, many studies has been focused on damages of the structures. Therefore, active vibration suppression of piezoelectric stiffened laminated panels are studied subjected to normal blast wave in this paper. Due to the characteristics of piezoelectric materials as fast responses, the vibration behaviors of stiffened composite panels could be controlled easily by piezoelectric actuators under a blast loading. A stiffened panel with piezoelectric effect is formulated using finite element method.”
“In aircraft vehicles, there are many skins with an array of stiffening ribs in the wings and fuselage. These structures have been widely used because of their light weight and ability to withstand dynamic loads. In most cases, the catastrophic disaster of the air vehicles was due to the failure of the fuselage under blast loads. The overpressure of the blast loading generated typically acts during few milliseconds. Thus, active vibration control of stiffened composite structures is an important problem. In this regard,~~~”
Three cases of the results are compared with the literature’s in this paper. Therefore, authors think that is enough.
Thank you again,
If you have additional comments or questions for this manuscript, do not hesitate to inform authors as soon as possible.
Best regards,
Chang-Yull Lee
Author Response File: Author Response.docx
Reviewer 4 Report
In this paper, the authors have reported a vibration suppression control of stiffened model with piezoelectric sensors and actuators under blast loads. Based on a LQR control algorithm, the proposed method was proved can optimise the position of sensors and actuators. The study is very interesting, however, several minor concerns in the current stage of manuscript need to be addressed before consideration of acceptance, as follows:
To make the manuscript self-contained and more readable, make sure all the variables have been fully specified, for example, the parameters in Fig. 1.
In section 2, please add more motivations for the design of the panel.
Carefully recheck grammar errors.
As such the subject matter is of interest to those in the field of piezoelectric sensors, in the introduction, when mentioning the piezoelectric harvesters, a classic work of energy harvester/generator could be highlighted - “A self-powered radio frequency (RF) transmission system based on the combination of triboelectric nanogenerator (TENG) and piezoelectric element for disaster rescue/relief”
Author Response
December 20, 2019
Dear Editor of Applied Sciences
Thanks a lot for comments on applsci-669772.
Authors completely improve the quality of this work based on not only the reviewer’s valuable suggestions but also check again all portions of the manuscript.
Then, “response to reviewer’s comments” are summarized points by points, and authors improved the original version as indicated in red.
For more comments or questions on this manuscript, do not hesitate to contact us.
Thank you once again.
Professor Chang-Yull Lee
Department of Aerospace Engineering,
Chosun University, South Korea
Response to Reviewer 4 Comments
Thanks for valuable suggestions to improve the quality of the manuscript.
In this paper, the authors have reported a vibration suppression control of stiffened model with piezoelectric sensors and actuators under blast loads. Based on a LQR control algorithm, the proposed method was proved can optimise the position of sensors and actuators. The study is very interesting, however, several minor concerns in the current stage of manuscript need to be addressed before consideration of acceptance, as follows:
Point 1: To make the manuscript self-contained and more readable, make sure all the variables have been fully specified, for example, the parameters in Fig. 1.
Response 1: Thanks for your advice. Authors added the meaning of variables in Fig. 1, and also looked at other variables and revised in the other parts.
Point 2: In section 2, please add more motivations for the design of the panel.
Response 2: Thank you again for reviewer’s thoughtful care. According to the reviewer’s suggestion, authors added the motivations in section 2.
“In aircraft vehicles, there are many skins with an array of stiffening ribs in the wings and fuselage. These structures have been widely used because of their light weight and ability to withstand dynamic loads. In most cases, the catastrophic disaster of the air vehicles was due to the failure of the fuselage under blast loads. The overpressure of the blast loading generated typically acts during few milliseconds. Thus, active vibration control of stiffened composite structures is an important problem. In this regard,~~~~”
Point 3: Carefully recheck grammar errors.
Response 3: According to the reviewer’s comment, the manuscript was checked again by native speakers. We would like to thank Editage (www.editage.co.kr) for English language editing.
Point 4: As such the subject matter is of interest to those in the field of piezoelectric sensors, in the introduction, when mentioning the piezoelectric harvesters, a classic work of energy harvester/generator could be highlighted - “A self-powered radio frequency (RF) transmission system based on the combination of triboelectric nanogenerator (TENG) and piezoelectric element for disaster rescue/relief”
Response 4: Thanks for your valuable advice. Authors added the research as Ref. [8] in the introduction section.
“Also, Xie et al. [8] designed a self-powered and wireless RF transmission device using by combination of triboelectric nanogenerator (TENG) and off-the-shelf piezoelectric element.”
Thank you again,
Additional comments or questions for this manuscript, do not hesitate to inform authors as soon as possible.
Best regards,
Chang-Yull Lee
Author Response File: Author Response.docx
