Study on the Vibration Active Control of Three-Support Shafting with Smart Spring While Accelerating over the Critical Speed
Round 1
Reviewer 1 Report
Interesting work, however with some open questions
Line 2: over cirtical vibration or better over critical speed?
Line 16: Why for the under critical speed, if over critical speed is the problem?
Line 48 and 53: Is the academic rank (Professor) relevant for the quality of research? In line 50 the reference is as usual/common in science
Line 70: in short terms, what is a smart spring? How is it composed? Later on a principle sketch?
Line 97: “As shown…” please check the sentence
Line 103: Figure 1 shows a topological model. Figure 2 a physical model derived from the topological model. I can not find/see a finite element model here. Furthermore, any information about the model structure? Number of degrees of freedom? Number of elements? Etc…
Line 118: Matlab-Import od ADAMS Modell. Any linearization of a geometrically non-linear model? Any comments on gyroscopic effects (included/not included)? Is the import result a state space model? If yes, how the operational point is defined?
Line 130: If the rotor is isotropic, the shaft rotates at a constant speed in a bended shape. There no bending vibration but a constant bending deflection that depends on speed. Only a isotropic situation would cause dynamic bending known as “Gleichlauf” and “Gegenlauf” compare, Gasch et al. Rotordynamik.
Line 138: To my understanding Fig. 6 presents the run up through the critical speed without/with control forces. If the rotor is isotropic, deflection in y-direction and z-direction should be identical during rotation around x-direction
Line 211: If the real control forces are limited, how good would numerical results with lower control forces match the experiments? Any chance/comment on model updating?
Line 238: This optimal result only holds, if the run up follows every time the same acceleration-time curve. Even if this is the case, the run out (reduction from over critical speed to under critical speed) can cause a different situation. Any comment on control performance for this case?
Author Response
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Author Response File: 
Author Response.pdf
Reviewer 2 Report
The importance of this research topic has not been fully explained. in the introduction section, more explanations about the importance of this issue and the expression of articles related to this research are needed. In the analysis section, more comprehensive explanations are needed to show why this method was used for analysis and why other methods were not used. the conclusion part of this research needs to be much better and much more talk about conclusions and comparisons with similar research is needed.
Author Response
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Author Response File: Author Response.pdf
Reviewer 3 Report
The authors deal with active control of the rotor vibration using smart spring, which is in principle friction damper with damping force controlled by piezoactuator. Possibility to actively affect rotor vibrations is an excellent tool for all the time increasing machine parameters. Although similar effect can be achieved in some cases by simpler methods, e.g. by direct control of bearing bushing by means of piezoactuators, the use of smart springs can be useful especially in rotor systems with rolling bearings. The effect of smart spring is at first analysed by simulation for different parameters, which enables system optimization. However, as the most positive should be taken the fact, that simulation result were verified by experiments. It is unfortunately very rare event in contemporary literature.
Author Response
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Author Response File: Author Response.pdf
