Uncertainty Representation of Natural Frequency for Laminated Composite Cylindrical Shells Considering Probabilistic and Interval Variables

Round 1

Reviewer 1 Report

The paper deals with free vibration of composite shells. Although I am far from an expert in the field the approach appears sound.

What I miss is clearer statement of the novelty of the approach and the gap to indicated to the reader what the news value is.

Author Response

Dear reviewer,

Thank you very much for your comments.  These point-by-point responses details are presented in the attached PDF file.

Author Response File: Author Response.pdf

Reviewer 2 Report

The authors presented a study where they studied the effect of uncertainties in the material properties of a composite panel/shell on the natural frequencies of the structure. It is an interesting study but there are a few points that need to be clarified:

1) The authors used the classical plate theory and obtained an algebraic equation for predicting the natural frequency of the shell. Depending on the geometry of the composite shell, it may not be possible to obtain a simple relation as Eq. (13). So, is it possible to apply this approach to any type of numerical solution technique? 

2) As the number of layers are increased, how are the effects of uncertainties are changing? It seems that compared to 3-layers, the standard deviation of the DNF is decreased for 5 and 7 layers. However, there is not any difference between 5 and 7 layer cases. I would expect that it should decrease as the number of layers are increased. 

3) Although the results are based on the DNF, it would be better to see the effect of uncertainties on the frequency response functions. Thus, the readers can understand how the results are affected more clearly.   

Author Response

Dear reviewer,

Thank you very much for your comments.  These point-by-point responses details are presented in the attached PDF file.

Author Response File: Author Response.pdf