Detection, Localisation and Quantification of Structural Damage Using Changes in Modal Characteristics
Round 1
Reviewer 1 Report
The paper explore techniques for identifying and pinpointing damage within a beam through an analysis of its natural frequency variations and mechanical properties. It primarily concentrates on beams. The paper is excellently composed, and the models maintain consistency.
It's crucial to elucidate how modal prediction can be applied to different structural types for reader's understanding.
Nevertheless I endorse the publication of this paper.
Author Response
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Author Response.docx
Reviewer 2 Report
The article proposes a method to detect and locate damage of the structure and quantify its extent by analysing the characteristics of structural modal changes.
In the article, a reference model considering the modal curvature and linearisation of natural frequency decreases is presented. The localisation and quantification of structural damage are determined by the method of comparing the reference model with the examined model. The study has certain application value for some simple structures.
For complex structures, the scope of application of the method is somewhat difficult due to the difficulty of establishing a reference quantitative model and the difficulty of implementing a comparison between the reference and examined models.
There are certain deficiencies in the completeness of the article. It is suggested to add a detailed experimental example to verify the correctness of the proposed model.
I don't have any suggestions for modifying English quality.
Author Response
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Reviewer 3 Report
Journal: Applied Sciences
Manuscript Number: applsci-2606857
Title: Detection, localization and quantification of structural damage using change of modal characteristics
Authors: Marek Páleník, Juraj Úradníček and Miloš Musil
Reviewer Comments:
In this paper, the Authors present a method to detect, locate and quantify the damage in a beam.
In the Reviewer’s opinion, the abstract as well as the introduction of the manuscript should be improved. More precisely, the presented method and its variables should be carefully described by Authors. Moreover, in order to enhance the scientific impact of the paper, the reference list should be improved also considering other methods based on the decay of natural frequencies proposed in the scientific literature. Among others:
- G. Hearn and R. B. Testa. 1991. “Modal analysis for damage detection in structures”, Journal of Structural Engineering (ASCE), vol. 117, pp. 3042-3063.
DOI: https://doi.org/10.1061/(ASCE)0733-9445(1991)117:10(3042);
- S. Hassiotis and G. D. Jeong. 1993. “Assessment of structural damage from natural frequency measurements”, Computer&Structures, vol. 49, pp. 679-691.
DOI: https://doi.org/10.1016/0045-7949(93)90071-K;
- G. Lacidogna, G. Piana and A. Carpinteri. 2019. “Damage monitoring of three-point bending concrete specimens by acoustic emission and resonant frequency analysis”, Engineering Fracture Mechanics, vol. 210, pp. 203-211.
DOI: https://doi.org/10.1016/j.engfracmech.2018.06.034.
In addition:
- Page 2, fig. 1 should be improved. Please, revise;
- Page 2, lines 42, 43. The sentence “Damage is simulated by reducing … beam are maintained” is not clear. More precisely, is this reduction performed locally or not? Please, explain;
- Page 2, line 63. “section” instead of “chapter”. Please correct here and in the whole manuscript;
- Page 2, line 70. “MS” is not defined. Please, correct;
- Page 3, fig. 2. “x” and “v” are not defined. Please, revise;
- Page 5, fig. 7 should be improved since for x=0.7 m seems that CL=0. Please, correct.
In the Reviewer’s opinion, the manuscript may be considered for possible publication only after the described major revisions.
Author Response
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Reviewer 4 Report
Based on the presence of natural frequency drop compared to the reference system, this paper tried to define a method to detect and locate damage and quantify its extent. However, the description of the introduction and the proposed method are not detailed enough. The paper needs a significant revision before the consideration of possible publication in the journal.
1. The review of the literature is insufficient. The background, development, and existing methods for the damage identification using the modal change method should be described more clearly in the introduction part.
2. The unit of length adopted in Fig. 1 needs to be added, such as cm, mm, etc.
3. The description of the figures is not enough, the meanings of the horizontal and vertical ordinates needs to be explained in Fig. 2. What’s the meaning of “MS” in the title of Fig. 2?
4. Why is the modal shape as shown in Fig.2 (a) not from the origin at x=0 position?
5. The most important suggestion is that the proposed methodology in this paper needs a validation from a simple experiment.
The English pesentation is fine, and only a minor revision is needed.
Author Response
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Author Response File: Author Response.docx
Reviewer 5 Report
The current work introduces a research investigation focused on the identification, localization, and quantification of structural damage using the analysis of modal properties. In general, the findings of the study are rather intriguing. This manuscript might potentially be deemed suitable for publication, provided that the following considerations are taken into account.
1. The abstract part is a bit short. Authors should describe the application of this research in engineering practice to impress the reader.
2. The introduction definitely needs improvement. The authors need to analyze previous studies and provide reasons for conducting this study. Furthermore, a total of 15 references is less than a scientific paper. Some related articles that can be mentioned and included in this section are as follows: Finite element modeling of the bending and vibration behavior of three-layer composite plates with a crack in the core layer; Finite element modeling for free vibration response of cracked stiffened FGM plates; The Application of the Design of the Experiment to Investigate the Stability of Special Equipment.
3. Figure 1 needs to be placed in the Cartesian coordinate system.
4. Sources should be cited for formulas.
5. The results section is quite rich. They are ok.
6. Check all English errors.
Moderate editing of English language required
Author Response
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Author Response File: Author Response.docx
Round 2
Reviewer 3 Report
The Reviewer thanks the Authors for their answers and does not have any further questions for them
Reviewer 4 Report
The paper can be accepted in its present form,
Only minor editing of English language is required
