Comparative Analysis of Different Model-Based Controllers Using Active Vehicle Suspension System
Round 1
Reviewer 1 Report
This paper deals with the active vibration control of a vehicle suspension system. Comparison with different control techniques is described. Dynamic control performance for different controllers is tested by computer simulations. Active control is analyzed in terms of vertical displacement, suspension travel and wheel deflection. Results showed that the STA based HOSMC exhibits a better performance with respect to FOSMC, ISMC, PID, LQR and passive suspension system. Some minor comments are given below.
1) Authors should describe the differences with respect other recent works such as active vehicle suspension control approach with electromagnetic and hydraulic actuators.
2) A description about how active vibration control can be implemented in practical suspension systems should be included.
3) Parametric uncertainty represents a relevant issue in the control implementation. Thus, parameter identification methods of vibrating mechanical systems have been proposed to deal with this problem. An explanation about how to choose the suitable control gains in presence of parametric uncertainty is recommended.
Author Response
This paper deals with the active vibration control of a vehicle suspension system. Comparison with different control techniques is described. Dynamic control performance for different controllers is tested by computer simulations. Active control is analyzed in terms of vertical displacement, suspension travel and wheel deflection. Results showed that the STA based HOSMC exhibits a better performance with respect to FOSMC, ISMC, PID, LQR and passive suspension system. Some minor comments are given below.
Authors should describe the differences with respect other recent works such as active vehicle suspension control approach with electromagnetic and hydraulic actuators.
Answer:
We would like to thank the reviewer for the positive feedback.
In the revised paper I briefly described an active vehicle suspension control approach with electromagnetic, pneumatic and hydraulic actuators along with modern approaches and recent works. Please read the introduction section of the revised manuscript.
2) A description about how active vibration control can be implemented in practical suspension systems should be included.
Answer:
Thanks for your suggestion. In the revised manuscript I concisely described the practical implementation of active suspension system based on the active control laws. Please read the contents in Numerical Simulation Results and Discussion section of the revised version of the paper in detail.
3) Parametric uncertainty represents a relevant issue in the control implementation. Thus, parameter identification methods of vibrating mechanical systems have been proposed to deal with this problem. An explanation about how to choose the suitable control gains in presence of parametric uncertainty is recommended.
Answer:
Thanks for your valuable suggestion. In the work, the problem under consideration is to find suitable SMC signal that derives the system state to the desired trajectory, i.e., by using sliding mode control theory. The controller gain are chosen suitably by hit and trial method until the error approaches to zero.
Reviewer 2 Report
The article deals with an interesting issue related to improving driving comfort by minimizing the impact of road unevenness. It is however written very chaotically.
The article lacks the formulated research problem and the described research method. The purpose of the article ("The key objective of the paper is to provide ride ease to passengers under rutted, bumpy, and irregular road surfaces by designing an effective active suspension control strategy for a quarter-automobile model."), is poorly formulated.
There is no introduction that will be related to the purpose of the article and the research problem and the method used to solve the research problem.
Formulas have wrong numbering, and therefore references to designs in the text of the work are incorrect (marked in the text of the work).
The variables used in the formulas are different compared to their use in the text of the work. Variables in the text of the work, in tables, in drawings should be written as in the formulas (italics).
Figures appear randomly in the text, in places not corresponding to the content of the article. The text is very illegible and imprecise.
English should be improved.
The discussion lacks the reference of the created theoretical active damping control strategies to real design solutions for steering control in cars.
Section numbering should begin with 1.
Comments for author File: 
Comments.pdf
Author Response
The article deals with an interesting issue related to improving driving comfort by minimizing the impact of road unevenness. It is however written very chaotically.
The article lacks the formulated research problem and the described research method. The purpose of the article ("The key objective of the paper is to provide ride ease to passengers under rutted, bumpy, and irregular road surfaces by designing an effective active suspension control strategy for a quarter automobile model."), is poorly formulated.
There is no introduction that will be related to the purpose of the article and the research problem and the method used to solve the research problem.
Answer:
Authors would like to thank the respected reviewer for his precious time to review the manuscript and constructive suggestion to improve the quality of the paper. In the revised manuscript, I formulated the abstract and include more details in the introduction section that relates to my research problem, methods and motivation of my work.
Formulas have wrong numbering, and therefore references to designs in the text of the work are incorrect (marked in the text of the work).
Answer:
Thanks for your valuable suggestion. In the revised manuscript i have corrected the format, revised all the equations concisely along with references numbering.
The variables used in the formulas are different compared to their use in the text of the work. Variables in the text of the work, in tables, in drawings should be written as in the formulas (italics).
Answer:
Thanks for your valuable suggestion. I applied same variables in the formulas, text, figures and tables. Please see the revised content of the paper as suggested by comment section in pdf file.
Figures appear randomly in the text, in places not corresponding to the content of the article. The text is very illegible and imprecise.
Answer:
Thanks for the recommendation. I placed figures in their appropriate position as the paper is written in Latex format thus some figures are adjusted automatically.
English should be improved.
Answer:
Thanks for your valuable suggestion to improve the language quality of the manuscript. In the revised manuscript I improved sentence structures, grammar, articles, and punctuation errors. Moreover, I revised the paper concisely to make it more comprehensible.
The discussion lacks the reference of the created theoretical active damping control strategies to real design solutions for steering control in cars.
Answer:
Thanks for your suggestion. In the revised manuscript I briefly described the practical implementation of active suspension system based on the active control laws. Please read the contents in Numerical Simulation Results and Discussion section of the revised version of the manuscript.
Section numbering should begin with 1.
Answer:
Section numbering of the manuscript is properly formatted. Please check the revised manuscript.
Furthermore, all pointed mistakes and errors in the comment section of attached pdf file are carefully fixed.
Round 2
Reviewer 2 Report
Since my comments have been taken into account by the authors, I recommend the article to be printed.
