Lei Wu’s research while affiliated with Wuhan University of Technology and other places

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Publications (2)


Figure 4. Probability of the natural occurrence variation in navigational environment impact factors at different levels.
Figure 5. Variations in impact probabilities with navigational environment impact factor level.
Figure 6. Accident cases and full sample impact probability distribution.
Evaluation index system of navigational environment impact factors.
Research indicators.

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Research on Uncertainty Evolution of Ship Collision Status Based on Navigation Environment
  • Article
  • Full-text available

November 2022

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48 Reads

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4 Citations

Journal of Marine Science and Engineering

Liwen Huang

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Yingfan Chen

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Lei Wu

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[...]

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Shuzhe Chen

There is a need to study the evolutionary laws of the risks in the navigation environments of complex marine areas. This can promote shipping safety using an early-warning system. The present study determines shipping flows and meteorological conditions in a marine area on the basis of meteorological and automatic identification system (AIS) data. It also determines the uncertainty evolution law of the navigation environment’s influencing factors. Moreover, a navigation risk evolution system for ships in complex marine areas was developed. A case study was carried out in a coastal area of China on the basis of the determined evolutionary laws. Evolution in the navigational environment risk within the case study area was analyzed. The results showed that the hydrometeorology wind factor has the greatest impact on the risk of ship collisions. This work was not only able to show advances in navigational collision environmental evolution laws but also provides a theoretical reference for the evaluation and early warning of risks in shipping environments.

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Risk Evaluation of Navigation Environment Based on Dynamic Weight Model and Its Application

June 2022

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55 Reads

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6 Citations

Journal of Marine Science and Engineering

In order to scientifically and reasonably evaluate the safety risk of ship navigation, to and better solve the problems of the poor sensitivity of static evaluation and insufficient ability to grasp the overall dynamic situation, in this paper, representative safety evaluation indexes for ship navigation are screened and the initial weight of each index is confirmed in combination with the improved analytic hierarchy process (IAHP), in order to learn the changes of navigation environment and accident samples in the waters in the jurisdiction. Finally, the dynamic risk evaluation is carried out by constructing a dynamic weight evaluation model for the safety risk of the navigation environment based on the weight fusion of subjective and objective impact factors. The waters under the jurisdiction of Sanya, China were selected for the study, and the navigation risk of the waters in the jurisdiction was calculated by using the dynamic weight evaluation model based on navigation risk. The calculation results are highly consistent with the results based on the statistics of historical accidents and the analysis of the characteristics of the navigation environment in the jurisdiction. The navigation risk in this water area is the greatest from May to September every year. The dynamic weight evaluation model can not only overcome the subjective evaluation distortion in the traditional risk evaluation theory of navigation environment in practical applications, but can also provide a scientific theoretical basis for the dynamic evaluation and early warning of the risk of ship navigation environments through continuous sample learning.

Citations (2)


... Thus, flange and shaft can be connected by using chamfers as shown in Fig. 1a. Due to the frequent changes of winds, waves and currents and other geographical environment and navigational status of ships during sailing [1], the main shaft could be subjected to cyclic torsional and bending loads, and the structural inhomogeneity could also lead to the occurrence of elastic stress concentration effects. This main shaft with one notch for research purpose can be shown in Fig. 1b, T is the torque, D is diameter of cross section of smooth part of the specimen, d is diameter of cross section of notch part, h is the radius difference of cross section between smooth part and notch part, and ρ is curvature radius of the u-notch. ...

Reference:

Effect of notch on fatigue performance of marine shaft made of 34CrNi3Mo alloy steel under torsional loading
Research on Uncertainty Evolution of Ship Collision Status Based on Navigation Environment

Journal of Marine Science and Engineering

... Consequently, "high vessel traffic density" is included in the risk inventory, culminating in a final list of 19 risk sources, as shown in Table 9. Table 9. Risk sources of vessel traffic accidents [24][25][26][27][28][29][30][31]. ...

Risk Evaluation of Navigation Environment Based on Dynamic Weight Model and Its Application

Journal of Marine Science and Engineering