Synthesis and Verification of Finite-Time Rudder Control with GA Identification for Electric Rudder System
Round 1
Reviewer 1 Report
The paper presents a design methodology for the control system of an aircraft rudder, taking into account its nonlinearities and modeling uncertainties. The finite time stabilization is obtained using a backstepping type method coupled with an identification procedure based on GA. The problem is of interest and the numerical simulations are matching with the theoretical developments. However, in my opinion, the following aspects must be clarified or detailed.
- line 158: the use of an integrator to obtain zero steady state error is appropriate for constant or piece-wise constant reference signals; this must be specified;
- statement of Lemma 1 is unclear;
- lines 172, 173, "such that the following conditions hold" is repeated;
- eq. (11): probably it is Va instead of V\alpha;
- Please revise Lemma 3; part (2) is unclear;
- line 188: please clarify the meaning of θa; is it measured?
- system (6) third equation: please check the term bKewm
- system (7), third equation: don't see where a3 is defined
- eq. (18): it is not clear how the first term in the right hand side appears.
- eq. (19): A "ds" is missing from the integral term;
- Can the identification procedure based on GA be implemented in real time?
Author Response
Please see the attachment
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Find attach a pdf.
The authors must verify the text, where many sentences do not have verb, or are unfinished.
The text presents an original approach to identification and controller design for electric rudder system. It seems that, from a practical point of view, it is difficult to to implement: many parameters are design parameter (see equation (30)). The authors must explain how to decide the values of these parameters. Which value take D in (40)?
Comments for author File: Comments.pdf
Author Response
Please see the attachment
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The new version of the paper includes my suggestions and recommendations.
However, before recommending the paper publication, I suggest the authors to carefully revisit part (2) of Lemma 3 which is still unclear: what V\alpha represents and how a\in(0,1) is used in the statement.
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
