Temperature- and Frequency-Dependent Nonlinearities of an Integrated Hydro-Pneumatic Suspension with Mixed Gas-Oil Emulsion Flow

Round 1

Reviewer 1 Report

This paper described work of experimentally and analytically investigating the temperature- and frequency-dependent properties of the hydro-pneumatic suspension with the gas-oil emulsion. An analytical model of the hydro-pneumatic suspension is formulated considering the effects of temperature on internal fluid properties, gas-oil emulsion flows between coupled chambers, dynamic seal friction, and polytropic change in the gas state.

Some considerations regarding the content of paper:

-It would be good to mention in the introduction about the peculiarities of the use of hydro-pneumatic suspension systems in various fields.

- It is better to give the figure 1 after formulas 1 and 2, because there are incomprehensible notations on it.

- The figure 2 should be in the middle of the page.

- It is better to take the inscriptions out of the figure 3, because they are not visible on it.

- No information is available regarding where the values for Table 1 were taken from.

- The paper does not indicate which software tool was used to obtain the graphs in the figures 5-9.

- Authors should carefully examine and correct syntactic errors. For example, in section 2. Materials and methods “respectivelys”.

- References are not designed according to the requirements of the journal.

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Reviewer 2 Report

The work under consideration is devoted to the analysis of the functioning of the air suspension, taking into account non-linear dynamic characteristics. This study is relevant due to the lack of a full description of the suspension as a control element. When considering such systems, nonlinear distributed blocks create complex, often non-design elements, expressed by spatially invariant vector functions. The work under consideration is of great interest, as it allows solving applied problems of automation systems. The work is logically correct and structured. The mathematical apparatus is beyond doubt. All conclusions are confirmed experimentally. However, the work is not framed according to the requirements of the journal. Namely.

1. The work should clearly distinguish and delimit two sections: Introduction and review of existing methods. At the moment, the author has combined these sections. The author is invited to rename the existing introduction to a review of existing methods. And to supplement the work with a new introduction indicating the exceptional relevance of the goals and objectives of the study.

2. 45. "which could also yield greater robustness [19]." it is recommended to add a link to DOI: 10.1109/SCM.2017.7970565

3. Before the conclusions, you need to add a discussion section. In which the author analyzes the work done. Notes the positive and negative aspects of the study. Outlines the path for further research.

  After these remarks are eliminated, the work can be accepted for publication.

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Round 2

Reviewer 2 Report

no comments.