Study on the Methods of Measurement, Optimization and Forecast of Propulsion Shaft Bearing Load of Ships

Li, Rui; Ji, Wang; Chen, Ziqi; Wang, Feixiang; Liu, Yujun

doi:10.3390/jmse11071324

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…Li et al (2023) 7) focused on the investigation of the shafting load measurement system based on the strain gauge method (SGM), used the optimization method based on quadratic programming (QP) to calculate the BDA and adopted algorithms based on the bearing load influence coefficients (BICs) to forecast the load after the adjustment. The experimental work, as well as the measurement, calculation and analysis of several real ships, indicated that the measurement, optimization and forecasting methods of the bearing load of the propulsion shafting of large ships in this study would be significant for guiding the actual construction work of ship shafting alignment.…”

Section: Kim Et Al (2021)mentioning

confidence: 99%

A Study on the Characteristics about Shaft Deflection According to the Change in Manufacturing Sequences

Park,

Seo

2023

J Weld Join

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Recently, the amount of orders for large container ships based on eco-friendly fuel is increasing. Container ships have very different characteristics of cargo as comparing other type cargo carriers, having a unique arrangement of structural members. In this reason, the classification societies propose major governing conditions that affect independent shaft alignment calculations based on detailed analysis. In this study, the change in displacement around the shaft system, which occurs in the manufacturing process, was investigated using structural analysis modeling. The manufacturing process is divided into PE (Pre-erection), welding according to the erection sequences, lifting the block, setting on the dock, and finally reviewing the launching conditions. The results of this study, the displacement of the shaft system during the manufacturing stages were confirmed. The change in the number of block supports had the greatest effect on the change in deflection rather than the effect of welding heat, and the final results were similar to those of the PE condition. The shaft centering analysis can be predicted correct value in advance if the characteristics of deflection change according to the process are known, and accurate prediction can be made in a short time by using the proposed procedure.

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Section: Kim Et Al (2021)mentioning

confidence: 99%

A Study on the Characteristics about Shaft Deflection According to the Change in Manufacturing Sequences

Park,

Seo

2023

J Weld Join

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“…Strain measurement is yet another indirect method for measuring bearing offset. The principle is to theoretically calculate the influence coefficient of each bearing offset on the shaft's bending moment, then install strain gauges on the shaft to measure the change in the shaft's bending moment under different operating conditions, and finally invert the bearing offset [1,[16][17][18][19]. Adopting the wireless transmission device can alleviate the difficulty of data collection when the shaft is rotating.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of Hull Deformation on the Relative Attitude between Shaft and Bearing

Zhou,

Zhao,

Yuan

et al. 2023

JMSE

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The unclear change laws of bearing offset and rotation, both of which influence the condition of shaft alignment during hull deformation, make it difficult to optimize shafting design. In this paper, an integrated hull-bearing-shaft model is designed and built for a cantilever beam loading test. Displacement sensors are utilized to determine the change in displacement of the hull, bearings, and shaft. The pressure distribution at the bow and stern ends of the bearing is measured using a new type of thin-film pressure sensor. The test results show that the rotation angle of the shaft and bearing varied differentially during hull deformation, and the magnitude of the shaft-bearing angle was comparable to the rotation angle. The measured rotation angles of the front and rear ends of the stern tube bearings are opposite to the theoretical value of a cantilever beam, indicating that the stern tube has a non-negligible effect on local deformation, and it is recommended to measure the bearings directly as opposed to the alternative structure to obtain the rotation. The change pattern of the shaft and bearing attitude does not change with the different initial state of the shaft, which indicates that the initial error of installation will be retained during the hull deformation process. The change pattern of the shaft and bearing attitude is unaffected by the initial state of the shaft, indicating that the initial installation error will persist during hull deformation. In some instances, the bearing reaction force remained unchanged, but the shaft-bearing angle and bearing pressure altered, indicating that the bearing condition cannot be determined solely by the bearing reaction force. The results of bearing pressure and the shaft-bearing angle can be compared, indicating that the thin-film pressure sensor can be used to determine the status of the shaft-bearing angle, particularly during the installation phase.

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A novel 4-DOF marine stern bearing support model considering discrete distribution effects

Chen,

Wang,

et al. 2024

Ocean Engineering

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Study on the Methods of Measurement, Optimization and Forecast of Propulsion Shaft Bearing Load of Ships

Cited by 5 publications

References 22 publications

A Study on the Characteristics about Shaft Deflection According to the Change in Manufacturing Sequences

A Study on the Characteristics about Shaft Deflection According to the Change in Manufacturing Sequences

Experimental Study on the Effect of Hull Deformation on the Relative Attitude between Shaft and Bearing

A novel 4-DOF marine stern bearing support model considering discrete distribution effects

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