Studies on a Piezoelectric Cylindrical Transducer for Borehole Dipole Acoustic Measurements

Round 1

Reviewer 1 Report

 

This paper presents the completed results of investigations of piezoelectric cylindrical transducer for borehole dipole acoustic measurements, based on the classical electromechanical approach. Additionally, such an approach to the subject is very interesting in the view of application market, because this work lays a foundation for the new development of the transducer in borehole dipole acoustic shear wave measurements.

 

 Review of Literature: The author cited clear review of literature and several appropriate references were used in the introduction section. These statements contributed well to the overall understanding of the subject and to the reasoning for establishing the problem statement, namely acoustic shear wave measurements.

 

Methodology:

Generally, the methodology is well prepared, the action plan is clearly defined and well thought out except for the unpredictable time to iteratively improve individual prototypes. The methods used to gather the data for this article have been properly selected and justified and finally clearly explained.

 

The instruments and applied techniques were explained but the reliability coefficients of all possible tests were not given and no discussion of the statistical techniques was given in this particular section.

 

Findings and conclusions

The findings were well organized, sectioned, and reported objectively. The tables were well organized but, due to the difficulty of the statistical tests employed, would not be stand-alone to the average reader.

A very strong point of the article is the high feasibility of using in the practice of the discovery covered by them in practice. The presented concept of applying the solution resulting from the conducted experiment in practice is feasible and probably profitable.

 

Language: The English is good; I have found only two small mistakes in language that need corrections as for example:

 

66 The x-axis is paralle to the length direction of the bender bar and the bar is symmetric about the xy-plane.

67 It appears that you have an unnecessary comma before the dependent clause marker when.

 

168 is confined in the space of cylindrical housing, it will not be hamful to

The word difficult is often overused. Consider using a more specific synonym to improve the sharpness of your writing

Author Response

Dear Editor, Dear reviewers,

Thank you very much for taking your time to review this manuscript. On behalf of my co-authors, I really appreciate all your comments and suggestion to improve our work. Appended to this letter is our point-by-point response to the comments raised by the reviewers. The comments are reproduced and our responses are given directly afterward in a different color (red).

I hope that our revised manuscript is accepted for publication in the Journal of Applied Sciences.

Thank you and best regards.
Yours Sincerely,

Dr. Yinqiu Zhou

 

Author Response File: Author Response.docx

Reviewer 2 Report

The piezoelectric cylindrical transducer for borehole for formation acoustic velocity measurement is interesting approach. The novelty of the proposed concept for piezoelectric cylindrical transducer with special structure is well shown. The mathematical analysis and simulation results are very well supported. There are some English grammar issues. However, literature search in the introduction is too short so there are small previous research background. Authors missed too many necessary references. Therefore, the paper can be minor revision if authors should update the references. 

1.Please add the reference (However, they have the disadvantage of limited bandwidth in low frequency.)

2. Please add the reference (Considering the continuity boundary condition at the junction between the composite layer and the metal layer, the physical function such as the transverse displacement, the shear force, the rotation angle, and the bending moment are continuous._

3.Please add the reference (For the traditional piezoelectric dipole source in borehole acoustic measurement, due to the limited strain of the piezoelectric ceramic material itself, it is difficult to generate large displacement at low frequencies).

4. Please add the reference (Its vibration principle is that, when a voltage is applied to both surfaces of each piezoelectric element, and one extends and the other one contracts, which produces the bending motion of the entire bender bar.) with the reference (https://www.mdpi.com/1424-8220/20/11/3059.) 

5. Please add the reference (Besides, with a full azimuthal angle of radiation surface, the vibration of the piezoelectric actuator is confined in the
space of cylindrical housing so that the vibration otherwise coupling into the fluid of the borehole is effectively inhibited to interfere with the sound field by the outer radiation surface.)

6.Please add the reference (This is because for the piezoelectric material itself, the strain is so limited that it is hard to generate large displacement in the low frequency range) with the reference (https://www.mdpi.com/1424-8220/20/15/4165).

7. Please use formal English expression such as Also -> In addition.

8. Please do not use the space between digit and unit such as 3698 Hz.

Author Response

Dear Editor, Dear reviewers,

Thank you very much for taking your time to review this manuscript. On behalf of my co-authors, I really appreciate all your comments and suggestions to improve our work. Appended to this letter is our point-by-point response to the comments raised by the reviewers. The comments are reproduced and our responses are given directly afterward in a different color (red).

I hope that our revised manuscript is accepted for publication in the Journal of Applied Sciences.

Thank you and best regards.
Yours Sincerely,

Dr. Yinqiu Zhou

 

Author Response File: Author Response.docx