Comprehensive optimization for the alignment quality and whirling vibration damping of a motor drive shafting

Lai, Guojun; Liu, Jinlin; Liu, Shuyong; Zeng, Fanming; Zhou, Ruiping; Lei, Junsong

doi:10.1016/j.oceaneng.2018.03.003

Cited by 14 publications

(10 citation statements)

References 6 publications

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“…Moreover, for the first and second types of deformed Bessel functions with large or small values, approximate substitutions are used and eliminated before algebraic operations. The approximate substitutions are shown in Equations ( 14) and (15), which correspond to when x is small and large, respectively.…”

Section: The Determination Of the Cylindrical Influence Coefficient Factorsmentioning

confidence: 99%

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Research on the Contact Pressure Calculation Method for the Misaligned Elastomeric Journal Bearing

Zhou

Zhao

Yuan

et al. 2022

JMSE

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The pressure distribution of a misaligned elastomeric journal bearing is crucial for analyzing the uneven excessive wearing of the propulsion shaft bearing. However, analysis of the misaligned bearing is usually mainly based on the finite element method (FEM), which lacks a convenient and effective calculation method. This paper uses the influence coefficient factors (ICs) method to analyze the contact pressure of the misaligned bearing. First, the elastic displacement of the cylindrical shell subjected to a single point of concentrated force is derived and used to attain the new influence coefficient factors. Then, the geometric boundary conditions of planar conformal cylindrical contact are extended to the case of non-planar contact. Finally, the proposed method is applied and compared with other methods. The results show that the influence coefficient factors are greatly affected by the shape and constraints of the contact object. The proposed method is suitable for cylindrical shell contact analysis and has the same accuracy as FEM with half of the time consumption. In addition, the bearing capacity and contact stiffness are decreased as the effective contact area decreases due to misalignment.

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Section: The Determination Of the Cylindrical Influence Coefficient Factorsmentioning

confidence: 99%

“…There is scarce research on misaligned journal bearing contact analysis. Lai [15] and Lee [3] conducted contact analysis of the shafting journal bearing using the FEM. The results demonstrated that the misalignment has a significant influence on the internal pressure of the bearing.…”

Section: Introductionmentioning

confidence: 99%

Research on the Contact Pressure Calculation Method for the Misaligned Elastomeric Journal Bearing

Zhou

Zhao

Yuan

et al. 2022

JMSE

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“…e shafting model of the test rig was established using beam element by the finite element method. Each bearing was simplified into two equivalent springs in horizontal and vertical directions with an isotropic stiffness value of 5 × 10 9 N/m [21]. e shear vector Q { } e and deformation vector δ { } e of each element are as follows:…”

Section: Shafting Alignmentmentioning

confidence: 99%

“…Yang Guodong investigated the influence of alignment on the shafting vibration by analysing the bearing lubrication characteristics [20]. Lai et al optimized the alignment state and inherent vibration characteristics of a motor drive propulsion shafting by adjusting the bearing offset and presented the optimization weight coefficient [21,22]. Yang-Yang and Jun found that adopting the shafting alignment scheme according to the bearing load can suppress the vibration transmission at some peak frequency points [23].…”

Section: Introductionmentioning

confidence: 99%

Effects of Ship Propulsion Shafting Alignment on Whirling Vibration and Bearing Temperature Response

Lei

Zhou

Chen

et al. 2021

Mathematical Problems in Engineering

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Ship’s propulsion shafting is one of the main sources of ship vibration and noise. The shafting, whirling vibrations, and alignment are important factors that affect the comfort, stability, and reliability during a ship’s navigation. However, the mechanism of the interacting of the both factors is not fully revealed. In this paper, the effect of shafting alignment on whirling vibration and the bearing temperature response is studied by experiment. The test scheme is designed reasonably according to the theoretical analysis. The results show that the horizontal component of the shafting whirling vibration can be effectively reduced by adjusting the shafting alignment state while the vertical component is not. The shafting axis balancing position (SABP) slightly moves upward in high speed, which should be considered in the dynamic alignment design of the shafting, especially for the high-speed shafting. Little ABSB (the angle between the shafting centre line and the No. 1 bearing centre line) is beneficial to the stable operation of shafting, while appropriately increasing the ABSB and bearing load is beneficial to reducing the shafting whirling vibration. By balancing the relationship between bearing load and ABSB, the performance of whirling vibration and bearing temperature response can be optimized.

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“…They found that the misalignment of the flange and clutch has limited influence on the whirling vibration of the shaft system in linear alignment. Lai et al [12] pointed out that the bearing stiffness can be regarded as a design variable based on the theory of rotor dynamics and sliding bearing lubrication, the alignment characteristics and whirling vibration response of shafting under linear alignment and reasonable alignment were calculated numerically. They used the linear programming to complete the comprehensive optimization of shaft alignment and whirling vibration.…”

Section: Introductionmentioning

confidence: 99%

Coupling characteristic analysis of ship shafting design parameters and research on multidisciplinary design optimization

Yin¹,

Liu²,

Zeng³

2020

J. vibroeng.

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In the design process of traditional ship shafting, the design quality is generally hard to get guaranteed for the lack of discipline coupling. In this paper, Multidisciplinary Design Optimization (MDO) is innovatively introduced to ensure design quality. Multidisciplinary decomposition of shafting can help to construct the MDO model of ship shafting based on multidisciplinary feasibility method. Then the sub-discipline model of shifting design can be further established, including calibration neutron discipline model, whirling vibration model, and dynamic stiffness of radial oil film bearing model. Collaborative operation is implemented by the multidisciplinary model of shifting to obtain the experimental results. Based on Radial Basis Function (RBF) neural network, the responsive surfaces of variable, bearing load, and support stiffness can be constructed, in the meanwhile the dynamic stiffness decoupling of vibration model can be obtained. Fireworks algorithm is used to establish multidisciplinary optimization of seven-dimensional design variable. The results show that MDO helps improve the quality of shafting alignment and whirling vibration. The work in present paper also provides insight for the future optimization of research methods, design quality, and engineering experiments.

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Comprehensive optimization for the alignment quality and whirling vibration damping of a motor drive shafting

Cited by 14 publications

References 6 publications

Research on the Contact Pressure Calculation Method for the Misaligned Elastomeric Journal Bearing

Research on the Contact Pressure Calculation Method for the Misaligned Elastomeric Journal Bearing

Effects of Ship Propulsion Shafting Alignment on Whirling Vibration and Bearing Temperature Response

Coupling characteristic analysis of ship shafting design parameters and research on multidisciplinary design optimization

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