Structural Dynamic Model Updating with Automatic Mode Identification Using Particle Swarm Optimization

Round 1

Reviewer 1 Report

I consider that the article is very interesting, and I have the following suggestions.

The abstract is confusing. I understand that a plate is used for the FE model and in the experimental setup.

Regarding this my questions are:

1.       The FE model can be used for other types of objects? Or the model uses only the plates. How the method presented in the article can be used with other structures? Which are the limitations. This answer must be included in the article.

2.       It is well known that the fastening method between the plate and the exciter influence the parameters of the vibrations. This discussion regarding the influence of fastening must be included in the article.

3.       Why do you use an accelerometer for control? Why is it necessary? In figure 2, which accelerometer is used for control?  

4.       How the accelerometer on the plate influences the vibrations modes of the plate.

5.       Regarding the approaches. On page 8 in text and in table 5 are presented 2 approaches. Table 11 presents the results of an original approach. Where is this approach presented?

6. table 4 presents 4 different modes. Figure 6 presents 30 different modes. On page 7 40 modes shapes are presented. Please detail this because is confusing.

7.       Which MAC do you use? In the introduction, you present 3 different MAC variants.

8.       In the introduction on page 2 it is written “the MAC is an effective index to identify or track modes; however, it is not sensitive to mode shape changes, since all mode shape differences are considered into the scalar of single global index” . Then why do you use it to compare with ISR?

 

Also,  it is specified “According to Fig. 8, both indices achieved accurate mode identification, while the MAC values were commonly greater than the ISR ones. Thus, it can be concluded that ISR has higher sensitivity to the difference of mode shapes than MAC.” This conclusion is not obvious. I don’t understand how you made it. Please, make it more understandable and clearer because I don’t see where MAC values are higher. 

 

Author Response

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Reviewer 2 Report

The article contains an example of a theoretical and experimental dynamic problem.

It is a model-updating demonstrated on a simple model of a thin plate spring-fixed at the centre.

The natural modes have been verified based on the redistribution of particles over the plate during vibration at natural frequencies. 

 

The conclusions summarize the results of the study in the context of the measurement and evaluation methodology used.

The authors recommend in the conclusions to express some more thoughts on the interconnection between research and practice in this interesting field. 

Author Response

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