A Study on the Influence of Tire Speed and Pressure on Measurement Parameters Obtained from High-Speed Tire Uniformity Testing

Round 1

Reviewer 1 Report

The authors present an investigation on tyre speed and pressure influence on the measurement parameters obtained from high-speed tyre uniformity testing.

The paper is well structured and the background and the conclusions are sufficient. However, there are some minor problem to address.

1) In the abstract, the software Origin is mentioned. Reading the abstract, it seems that the data-fitting procedure carried out by means of the software Origin plays a major role in tha paper, whilst the software is only briefly mentioned in line 246. I propose the authors remove the part about the software from the abstract, or alternatively provide some additional information about the data-fitting technique. If the software provides analytical functions in output, it would be interesting to see some equations.

2) In subsection 3.2, the authors establish a mathematical model of the uniformity testing machine. I understand that the equilibria are computed with respect to the positions where the sensors are located, and that the quantities in interest can be derived from the measured forces. However, this could be extended a bit in the end of 3.2 since it is a bit unclear, in my opinion. I propose that the authors stress out the importance of deriving Equations (1)-(8).

3) In subsection 3.2, Equation (2), the notation for the angle phi is not consistent with the symbol used later in the paper (varphi in LaTeX). Also, the simbol varphi is used to denote the n-th phase angle. I would suggest to use the tw different symbols with consistency in the paper to avoid confusion.

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Reviewer 2 Report

1. The equations from (1) to (18) do not really add any value. They are basic mechanics equations and the Fourier series. However, three pages of the paper are devoted to a relatively trivial exercise.
2. The tyre speed rating should also be included when identifying the tyre. Testing at these very high speeds may be in excess of what the tyre was designed to do.
3. It is also expected that all the force variations will increase as the speed increases. This is due to the centripetal acceleration of the imbalanced mass. It is also well established in the literature that an increase in tyre inflation pressure decreases the radial damping of the tyre, resulting in more oscillation of the tyre forces. Similarly, rotating the tyre at high speed may change the effective rolling radius and increase the sidewall stiffness. All of these factors may contribute to the effects presented in the paper. However, the fundamental dynamics of rotating eccentrics are not discussed at all.
4. SATV and OTTV are not defined.
5. Conclusions by comparing the achieved results with that of low-speed uniformity tests, but the low-speed test results are not included as a baseline in the paper. It is very difficult to draw conclusions based on this comparison and it is one of the main aims of the paper.
6. I am unsure if the results of the paper are really novel. Is it the recommendation of the authors that all tyres be tested for uniformity at high speed?

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Round 2

Reviewer 2 Report

All concerns raised in the previous review were addressed. A final recommendation is that the speed rating is actually included in the paper.