Practical Implementation of Recursive Subspace Identification on Seismically Excited Structures with Fixed Window

Round 1

Reviewer 1 Report

Referee report for “Practical Implementation of Recursive Subspace Identification on Seismically Excited Structures with Fixed Window”. The paper demonstrates a recursive subspace identification (RSI) algorithm with a fixed window to investigate the time-varying dynamic characteristics under seismic excitations. The paper is a fairly applied text that combines a number of existing methods. However, it is done in such a way that it is clean and useful. I feel this paper is well-suited for Applied Sciences. The following comments should be addressed for clarity within the paper.

 

 

• Figure 1, what would a forgetting factor of 1 look like? Would it be appropriate to add to this figure?
• Line 150 “is defined” should be “are defined”.
• Figure 3 (b) some numbers overlap on the y-axis. Those should be adjusted. It is ok if they don’t line up with the ticks exactly but they really should not overlap.
• Figure 4, you say “The identified modal frequencies across various C” but you only had responses for “i”. Either update the caption or edit the figure to ass the corresponding C_E.
• What is the difference between figure 6 a and 6 b? Once is “noisy with MAC” and one is “noisy data with MAC”? Are both not data? This caption needs more information.
• Line 292, “larger enough” should be “large enough”. An online tool like Grammarly would help you catch a lot of these.
• Line 355, what is “gal”? Best to define that unit as readers may be unaware.
• For figure 10, how is the force measured? Maybe you can point out the load cells in figure 8?
• For figure 13, some figures are labeled as “around X seconds” and some as “between x seconds”. This is confusing, just list the times as you have in the legend, or add more detail to the captions.
• Figure 12, some text is overlapping
• Figure 9(a) and figure 12(b) really need some ground truth plotted in them. For figure 9, you could plot this as horizontal red lines for the mode frequencies with a discontinuity at 15 seconds. For figure 12 b, I understand that the change happens over time but at least showing the ground truth at the start and end would be helpful.

Author Response

Responses are attached.

Author Response File: Author Response.pdf

Reviewer 2 Report

Comments are attached. 

Comments for author File: Comments.pdf

Author Response

Responses are attached.

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

All concerns have been addressed.