Stability Analysis and Delay Compensation for Space Instable Target Simulator

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

The paper presents an interesting and current topic of research, particularly associated with the problem of space debris.  

There are lot of limitations of digital simulations over actual experiments if all the constraints and modelling errors are not taken into account.

 

The authors use a very simple spring mass model to analyse the stability of the SITS.  This is too simple with no non-linearity!! and is a text book system.  Definitely, it is well known that damping is required for stability.  Hence, bit difficult to appreciate.  

What is finite time for an experiment like this (line 165)? When is the system operated beyond this time?

Similarly, since the system is simple, a simple compensator is provided.  Are these really good enough for an actual debris collector?

Can you add some non-linearity in the system and discuss?  Also, instead of one degree freedom system, is it possible to use six degree freedom system?  This is will make the study more applicable for practical applications.

Comments on the Quality of English Language

Generally, the English is fine. Possibly, some editing is required to improve the quality of communication.

Author Response

 

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

In this paper, algorithms are designed to compensate the delay and analyze the stability of spatially unstable target simulators and seems to achieve the desired results as seen from simulations. However, I still have some suggestions and questions for the author to consider and this paper should be major revised before making the final decision.

1. The layout of the images is quite confusing, e.g., Figure 8, and the author should rearrange the position of the images and the text in the paper to make it more organized.

2. The images in the paper are so blurry that it is difficult to read the labels in the images, the author should adjust the resolution of the relevant images to make the content of the images clearer.

3. What are all the factors that cause delays? Can the compensator designed in this paper effectively compensate for the presence of multiple delays superimposed on each other?

4. What determines the time to switch between linear and non-linear compensators?

Comments on the Quality of English Language

In this paper, algorithms are designed to compensate the delay and analyze the stability of spatially unstable target simulators and seems to achieve the desired results as seen from simulations. However, I still have some suggestions and questions for the author to consider and this paper should be major revised before making the final decision.

1. The layout of the images is quite confusing, e.g., Figure 8, and the author should rearrange the position of the images and the text in the paper to make it more organized.

2. The images in the paper are so blurry that it is difficult to read the labels in the images, the author should adjust the resolution of the relevant images to make the content of the images clearer.

3. What are all the factors that cause delays? Can the compensator designed in this paper effectively compensate for the presence of multiple delays superimposed on each other?

4. What determines the time to switch between linear and non-linear compensators?

Author Response

 

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

Comments and Suggestions for Authors

I have no further comment.

Comments on the Quality of English Language

I have no further comment.