Method for Establishing a Traveling Wave Sound Field with Adaptive Control in a Water-Filled Sound Tube
Round 1
Reviewer 1 Report
the exact reason for this measurement should be described,
the value of the sound absorption coefficient of the water when an acoustic wave arrives is equal to 1.
What is the contribution of the authors to the argument?
the Comsol numerical model must be expanded in the explanations, the description too short.
The dimensions of the "kundt tube" are missing, which in the function of the dimensions we have values of the absorption/transmission coefficient that can be obtained.
It should be highlighted how the sound field changes in water.
If there are standing waves as in propagation in air and how they change as the frequency changes. Change the speed of sound propagation in water.
The purpose of the paper must be clarified in the conclusions
Author Response
Please see the attachment
Author Response File: 
Author Response.docx
Reviewer 2 Report
There is no references to well known equations 1-8.
The purpose of the work should be explained better, determination of unknown material sample properties. Which material properties can be determined from reflection and transmission coefficients?
The wavelength in the water and in the steel is not mentioned...
What are sources of the error in the algorithm?
The parameters of acoustic field are not shown (except the pressure in simulation), applied voltage on sources, sensitivity of sources, applied voltages....sources and receivers..
the nonlinear effects are neglected?
There is no direct comparison of simulation and measurement results...
There is no influence of wall propagations on the obtained results...
The purpose of adaptive filtering is not explained well..how is the amplitude and phase of the second source connected with the first source...
The B&K8100 projectors are point sources and the sources in figures are shown as plane sources...
The width of the tube is not given..
Which parameters of unknown material sample can be determined in this way..
The authors should shown the sound pressure field in front of the sample, in the sample and behind the sample....in simulation results...
The speed of DSP algorithm is not given and what exactly algorithm do with the second source signal...
The measurement system seems rather complicated to remove transmitted and reflected wave in the system having purpose to determine unknown material properties..
Author Response
Please see the attachment
Author Response File: Author Response.docx
Round 2
Reviewer 1 Report
in paragraph 2.1. Reflection and transmission coefficients
improve references es as
Iannace, Ciaburro ( Acoustic properties of nanofibers / Numerical simulation for the sound absorption properties of ceramic resonators)
Author Response
The reference of reflection and transmission coefficients in paragraph 2.1 has been changed to 'Numerical simulation for the sound absorption properties of ceramic resonators'
