Dynamic Analysis and Structure Parameter Research on a Hydraulic Anti-Swaying System for Container Cranes

Round 1

Reviewer 1 Report

The hydraulic anti-swaying system for containers designed by the authors in this paper mainly uses passive anti-swaying measures. This hydraulic anti-sway system has a simple structure and no complex control algorithm. A good and expected anti-swaying or rocking reduction effect can be achieved simply by a reasonable design of the hydraulic anti-swaying system. Therefore, in this paper, the dynamic analysis of the hydraulic anti-sway system is carried out. A dynamic model was established within the scope of actual engineering and the main factors and key parameters affecting the anti-sway or sway reduction effect were determined by simulating the actual working conditions. The purpose of this paper is to provide theoretical basis and guidance for the specific engineering design of the hydraulic anti-sway system.

The reviewers are very interested in this article. In the reviewer's opinion, this article has a clear research object and the designed anti-sway system has practical application value, and it is recommended to be revised and published.

Here are some questions and suggestions：

Figures 1-12, the text involved in the image is very unclear and it is important to improve the clarity of the image and keep the text visible before the article is published.

Does the container anti-sway system proposed by the authors still have better results in coastal strong wind or typhoon environment?

What is the approximate range of the self-oscillation frequency of the container lifting system?

In the southeast coastal region of China, which is under the influence of East Asian monsoon and northwest Pacific typhoon all year round, the peak frequency of the wind spectrum may be close to the self-oscillation frequency of the container lifting system in the strong wind and typhoon environment, how should this situation be handled?

The following article is suggested to be cited in the introduction section of the article：

Li, Q.; Jia, H.; Qiu, Q.; Lu, Y.; Zhang, J.; Mao, J.; Fan, W.; Huang, M. Typhoon-Induced Fragility Analysis of Transmission Tower in Ningbo Area Considering the Effect of Long-Term Corrosion. Appl. Sci. 2022, 12, 4774. https://doi.org/10.3390/ app12094774

Author Response

1.The text in Figs. 1-12 has been changed and the clarity of the picture has been improved.

2.In the establishment of the system dynamics model, although the effect of wind is not considered, the initial load swaying angle is considered, because when there is wind, there may be a load swaying angle, and this swaying angle will be attenuated.

3.The specific expression of the container lifting system frequency is given while describing Eq. (11). The factors that affect the frequency of the system are further expounded. Please see the revised section of the manuscript. The general range of frequency () is explained in the section of "Calculation example" added in the paper. (The "Calculation example" was corrected by another reviewer.)

4.Based on the actual structural parameters of crane operation, through the calculation of the parameters given in the manuscript, it can be seen that the system frequency range is relatively large. This frequency can generally avoid the natural wind frequency. We can take this problem put forward by the reviewer as one of the next step and in-depth study content. Sincerely thank the reviewer for the research suggestions.

5.The suggested reference has been inserted. Please see No. [42].

Reviewer 2 Report

The manuscript contains some information that can merit publication. However, there are some editorial and technical issues that must be seriously addressed

1. The organization of the paper is very poor. The work must be well organized in a standard form of a manuscript.

The abstract must be well-written in a standardized form to reflect a brief introduction, what was done, how it was done, the results obtained, the inference from the results, and the significance of the work.

3. The equations and the models should be separated from the results and the discussion should be separated. The manuscript must be properly organized.

4. The author has to bring out the novelty of the study that can merit the publication of the paper.

5. The methodology for the models and the solutions must be clearly stated.

6. The citations must be improved and modified as pointed out in the attached file. Such citations such as " In [32].....should rather be like "Areter [32]...".

The paper needs general overhauling. It is advisable that the authors consult an expert for such.

 

Author Response

The reviewer made the following six suggestions. We generally overhauled the manuscript based on these suggestions.

1.Based on the  recommendations 1 and 3, we have rearranged the manuscript. The equations and models are separated from the calculation example and discussion section.

2.Based on the reviewer's requirements, we have revised the abstract according to the conclusions of the manuscript.

3.The novelty of the research was explained in the last two paragraphs of the introduction.

4.The model is based on Lagrange method and discussed in time domain and frequency domain respectively.

5.The description of the citations has been modified based on the requirements of the reviewer.

Round 2

Reviewer 1 Report

The revised manuscript is recommended for publication and the reviewer has no further questions

Reviewer 2 Report

The authors have satisfactorily addressed my comments. The manuscript can be published.