Review of Vibration Control Methods for Wind Turbines

Round 1

Reviewer 1 Report

This paper presents a literature review on vibration monitoring and control systems for wind turbines. Works published before 2020 are included.

The results obtained can be used in further, more detailed work.

The article is suitable for printing after removing minor errors:

Figure 16:  lack b).

Figure 33: no source.

Figure 34: no source.

Lines: 84, 113, 221, 994 - Reference source errors.

Line: 237 the Reynold -- Reynolds number.

Please check the use of: - in-plan vibration --   in-plane vibration?

The tables on lines 994 and 1010 should be numbered correctly.

Author Response

Answer to 1st Reviewer Comments:

Thank you for your precious comments and suggestions. All of them were taken into consideration and corrected in the manuscript.

Here are the detailed reviewer's comments with answers:

This paper presents a literature review on vibration monitoring and control systems for wind turbines. Works published before 2020 are included.

The results obtained can be used in further, more detailed work.

The article is suitable for printing after removing minor errors:

Figure 16:  lack b).

• Corrected

Figure 33: no source.

• Figure created by the authors, no source available

Figure 34: no source.

• Figure created by the authors, no source available

Lines: 84, 113, 221, 994 - Reference source errors.

• Corrected

Line: 237 the Reynold -- Reynolds number.

• Corrected

Please check the use of: - in-plan vibration --   in-plane vibration?

• Corrected

The tables on lines 994 and 1010 should be numbered correctly.

• Corrected

Author Response File: Author Response.docx

Reviewer 2 Report

The authors comprehensively reviewed the methods in literature for vibration control. Comments are as follows:

(1) There are different sources causing loads variations, such as the wind turbulence, wind shear and others as presented on page 5. It will be helpful if authors can summarize about the effectiveness of different vibration control methods for different sources of load variations, or the objectives of different vibration control methods to reduce which kind of load vibrations.  

(2) Strictly speaking, some methods are designed to increase the power efficiency instead of vibration control, e.g., SVGs and microstabs. The authors should present clearly their relations with vibration control. 

(3) For the title of the paper, in this reviewer's opinion, it is better to change "vibration control systems" to  "vibration control methods" as there are other factors for a control system, which are not fully covered in this review paper. 

(4) Several references are missing. 

Author Response

Thank you for your precious comments and suggestions. All of them were taken into consideration and corrected in the manuscript.

Here are the detailed reviewer's comments with answers:

The authors comprehensively reviewed the methods in literature for vibration control. Comments are as follows:

(1) There are different sources causing loads variations, such as the wind turbulence, wind shear and others as presented on page 5. It will be helpful if authors can summarize about the effectiveness of different vibration control methods for different sources of load variations, or the objectives of different vibration control methods to reduce which kind of load vibrations. 

- The vibration sources are combined when acting on the wind turbine. Also, the vibration mitigation methods help reduce multiple types of vibration originating from various sources. It is very challenging to isolate how each method acts on each vibration source. Otherwise, the cyclic pitch control is the only method designed to help reduce the effect of gravity loads. A clarification was added in the manuscript (Section 3.1, line 190 in the original manuscript).

 (2) Strictly speaking, some methods are designed to increase the power efficiency instead of vibration control, e.g., SVGs and microstabs. The authors should present clearly their relations with vibration control.

- A clarification was added to the manuscript about the relation of the mentioned methods to the vibration control: for microtabs (Section 3.3.3, line 350 in the original manuscript) and SVGs (Section 3.3.6.1, line 455 in the original manuscript).

 (3) For the title of the paper, in this reviewer's opinion, it is better to change "vibration control systems" to  "vibration control methods" as there are other factors for a control system, which are not fully covered in this review paper.

- Corrected

 (4) Several references are missing.

- A thorough revision has been made, and the missed references were added correctly.

Author Response File: Author Response.docx

Reviewer 3 Report

Authors provides a thorough investigation regarding the approaches for vibration mitigation methods for HAWT. The paper gives good overview of existing and yet to be introduced methods, it describes their effectiveness, implementation challenges, utility, summing their pros and cons.

The paper is properly organized and well written. I am not a native English speaker, however I found some grammatical and spelling issues, some sentences might not be clear, also several font styles and sizes appear in the text, and therefore it should be carefully revised.  

While revising the text, please keep constant text style, e.g. if you bold Figure, always bald it etc. I know it would be a hard work, but I suggest to change the font in all figures to a style in accordance with the paper main style.

Some issues to be corrected:

Line 47, 57, 59, 66: there should be no „:”

Line 84, 113, 221, 994: there is a problem with a reference

Line 93-94, 270-271: text style problem

Line 94: “such as the excellent work done by” I suggest not to give personal opinion about someone’s work.

Line 118-119: it should be written in one line

Line 239-242: I suggest to first mention fig 4a than fig4b, not vice-versa

Line 266: I suggest not to use bold in the text while refereeing to a figure etc.

Line 288: please use constant text style. If you put a dot at the end of following bullets, always put it and vice-versa.

Line 485: there is missing caption for figure 16.b

Line 647: this sentence is confusing, it should be revised

Line 766: it should be “These” not “Those”

Line 818-821: I suggest to bullet each line

Line 994: table is missing caption

Author Response

Thank you for your precious comments and suggestions. All of them were taken into consideration and corrected in the manuscript.

Here are the detailed reviewer's comments with answers:

 Authors provides a thorough investigation regarding the approaches for vibration mitigation methods for HAWT. The paper gives good overview of existing and yet to be introduced methods, it describes their effectiveness, implementation challenges, utility, summing their pros and cons.

The paper is properly organized and well written. I am not a native English speaker, however I found some grammatical and spelling issues, some sentences might not be clear, also several font styles and sizes appear in the text, and therefore it should be carefully revised. 

- A thorough revision has been made to correct the text according to comments.

While revising the text, please keep constant text style, e.g. if you bold Figure, always bald it etc. I know it would be a hard work, but I suggest to change the font in all figures to a style in accordance with the paper main style.

- A thorough revision has been made to correct the text according to comments.

Some issues to be corrected:

Line 47, 57, 59, 66: there should be no ":"

• ­Corrected

Line 84, 113, 221, 994: there is a problem with a reference

• Corrected

Line 93-94, 270-271: text style problem

• Corrected

Line 94: "such as the excellent work done by" I suggest not to give personal opinion about someone's work.

• Corrected

Line 118-119: it should be written in one line

• Corrected

Line 239-242: I suggest to first mention fig 4a than fig4b, not vice-versa

• Corrected

Line 266: I suggest not to use bold in the text while refereeing to a figure etc.

• Corrected

Line 288: please use constant text style. If you put a dot at the end of following bullets, always put it and vice-versa.

• Corrected

Line 485: there is missing caption for figure 16.b

• Corrected

Line 647: this sentence is confusing, it should be revised

• Corrected

Line 766: it should be "These" not "Those"

• Corrected

Line 818-821: I suggest to bullet each line

• Corrected

Line 994: table is missing caption

• Corrected

Author Response File: Author Response.docx