Review Reports

Round 1

Reviewer 1 Report

This paper investigates the problem of reduced-order H¥ filter design for singular fractional-order systems with order 0 < a < 1. This paper proposes a study of necessary and sufficient conditions for designs of both reduced-order H¥ filter and zero^th-order H¥ filter for singular fractional-order systems with order 0 < a < 1.

The paper is interesting and well presented. A minor revision could address the following points.

• The state of the art regarding the problem of fractional order system models and reduced order should be developed further, certain related papers should be addressed,
• Bourouba, S. Ladaci, A. Chaabi(2018)  Reduced order model approximation of fractional order systems using Differential Evolution algorithm Journal of Control, Automation and Electrical Systems 29:  1.  32–43
• Saxena; V. Yogesh; P. P. Arya, Reduced-order modeling of commensurate fractional-order systems, 2016 14th International Conference on Control, Automation, Robotics and Vision (ICARCV), Phuket, Thailand, Nov, 2016.
• The authors should explain the purpose of this reduction of order: Why? And at what amount? What is the price to pay for such modification in terms of precision and quality?
• The main result seems to be well defined and demonstrated.

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

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Comments for author File: Comments.pdf

Author Response

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Author Response File: Author Response.pdf