Structural Modifications for Torsional Vibration Control of Shafting Systems Based on Torsional Receptances

Liu, Zihao; Li, Wanyou; Ouyang, Huajiang

doi:10.1155/2016/2403426

Cited by 8 publications

(4 citation statements)

References 28 publications

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“…Since the hollowness of the shaft segments changed, in order to verify whether the optimisation results meet the strength requirements of shafting, the strength of the dangerous cross sections of shafting must be checked. The maximum bending stress of shafting generally appears at the stern bearing [21], so the cross section where the rear stern bearing is supported (No.1 cross section) and the cross sections where the diameter of the shaft changes at the head end (No.2 cross section) and tail end (No.3 cross section) of the rear stern bearing, were reckoned to be dangerous. The equations for the safety factors of these dangerous cross sections are available in the correlative shafting design standards [12], which will not be repeated here.…”

Section: Mdo Of Shafting Dynamicsmentioning

confidence: 99%

Research on MDO of Ship Propulsion Shafting Dynamics Considering the Coupling Effect of a Propeller-Shafting-Hull System

Liu

2023

Polish Maritime Research

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Dynamic designs for ship propulsion shafting can be categorised as complex multi-disciplinary coupling systems. The traditional single disciplinary optimisation design method has become a bottleneck, restricting the further improvement of shafting design. In this paper, taking a complex propulsion shafting as the object, a dynamic analysis model of the propeller-shafting-hull system was established. In order to analyse the coupling effect of propeller hydrodynamics on shafting dynamics, the propeller’s hydrodynamic force in the wake flow field was calculated as the input for shafting alignment and vibration analysis. On this basis, the discipline decomposition and analysis of the subdisciplines in design of shafting dynamics were carried out. The coupling relationships between design variables in the subdisciplines were studied and the Multi-disciplinary Design Optimisation (MDO) framework of shafting dynamics was established. Finally, taking the hollowness of the shaft segments and the vertical displacement of bearings as design variables, combined with the optimal algorithm, the MDO of shafting dynamics, considering the coupling effect of the propeller-shafting-hull system, was realised. The results presented in this paper can provide a beneficial reference for improving the design quality of ship shafting.

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Section: Mdo Of Shafting Dynamicsmentioning

confidence: 99%

Research on MDO of Ship Propulsion Shafting Dynamics Considering the Coupling Effect of a Propeller-Shafting-Hull System

Liu

2023

Polish Maritime Research

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“…As discussed in Section 2.3, the matrix J = Z can be determined from the gradient flow method, which meets the requirement of containing the desired eigenvalues. Then, it can be substituted into Equation (20) to get q, and m i (i = 1, 2, . .…”

Section: The Mass and Stiffness Matrix After Modificationmentioning

confidence: 99%

“…A geared rotor-bearing system was designed and tested by Tsai et al [19] to validate the method for solving the inverse structural modification using the measured receptances. Liu et al presented the strategy for the torsional vibration control of shaft systems based on the measured torsional receptances of the system [20].…”

Section: Introductionmentioning

confidence: 99%

Partial Frequency Assignment for Torsional Vibration Control of Complex Marine Propulsion Shafting Systems

Chen

Ouyang

et al. 2019

Applied Sciences

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With the large-scale and complexity of ship propulsion shafting, it is more difficult to analyze and control the torsional vibration of shafting. Therefore, an effective control method for the torsional vibration of shafting is of great significance in the field of ship engineering. The main strategy of torsional vibration control adopted in this paper is to keep the natural frequency of a shaft system away from the excitation frequency through structural modifications. In addition, because the basic parameters of much of the equipment in engineering applications cannot be changed, this restriction cannot be ignored when seeking solutions related to structural modifications. This paper studies the partial eigenvalue assignment for the torsional vibration control of complex ship propulsion shafting using the gradient flow method, which can shift a “dangerous” natural frequency to a safe value, while satisfying complex physical constraints. The models of a ship propulsion system and a diesel generator set are established to demonstrate several different desired modification schemes and constraint conditions in practice. In particular, close frequencies are shifted. The numerical simulation results demonstrate that it is effective and feasible to make a partial frequency assignment of torsional vibration, which provides a reliable approach for the control of torsional vibration for complex shaft systems in practical engineering.

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“…The Multi-Island Genetic Algorithm was applied to optimize this model, and the robustness of driveline torsional vibration was improved after optimization. Structural modification is an effective method to reduce vibration, and a reasonable structure of drive shafts could reduce torsional vibration effectively using numerical method (Liu et al, 2016).…”

mentioning

confidence: 99%

Investigation of the effect of rotation speed on the torsional vibration of transmission system

Liu

et al. 2019

JAMDSM

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In the process of power transmission, vibration and noise are generated, which have a great effect on vehicle NVH performance. Automobile power transmission system is an important part of automobile, which mainly includes engine, clutch, gearbox, drive shaft, main reducer, half axle and driving wheel. The torque of engine transfers to driving wheel through clutch, gearbox, drive shaft and rear axle. During the operation of vehicles, it is found that dramatic vibration occurs when the engine rotation speed reaches a certain value.This phenomenon has been investigated experimentally. A torsional vibration test rig was developed to investigate the torsional vibration caused by engine excitation, including the torsional vibration responses of flywheel end of engine and gearbox input shaft (Yang et al., 2017). The torsional vibration signals of transmission system were collected and the results show that increasing the flywheel mass can effectively reduce the effect of engine excitation on the torsional vibration of transmission system. For the investigation of torsional vibration of drive shafts, a field test of torsional vibration of automobile drive shaft shows that the reasonable arrangement of universal joints can reduce the torsional vibration of drive shafts (Wu et al., 2013). The fluctuation of input torque induced by internal-combustion engines is an AbstractDuring the operation of vehicles, it is found that dramatic vibration occurs when the engine rotation speed reaches a certain value. In order to study this phenomenon, a theoretical model of automobile transmission system is developed in this paper. This model includes four sub-models of gearbox, drive shafts, main reducer and rear axle, which take into account the inhomogeneous transmission speed of universal joint of drive shafts as well as the effect of time-varying and nonlinear factors of main reducer gears. In this model, the transmission system is an elastic system characterized by mass, stiffness and damping. The torsional vibration responses of transmission system are simulated, and the natural frequencies of transmission system and corresponding mode shapes are calculated using this model. Simulation results indicate that the maximum amplitude of torsional vibration response appears at a certain speed. On the other hand, experimental investigation on the effect of rotation speed on torsional vibration is conducted to verify the theoretical model. Experimental results also show there is the maximum amplitude of torsional vibration response appearing at a certain speed. The results of FEA indicate that the excitation frequencies of drive shaft are quite close to the first order natural frequency of drive shaft, and the resonant vibration of drive shaft would induce the resonant vibration of transmission system, given that the first order natural frequency of drive shaft is quite close to the third order natural frequency of transmission system. In particular, it is discovered that deviations between the rotation speeds corresponding to the maximum...

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Structural Modifications for Torsional Vibration Control of Shafting Systems Based on Torsional Receptances

Cited by 8 publications

References 28 publications

Research on MDO of Ship Propulsion Shafting Dynamics Considering the Coupling Effect of a Propeller-Shafting-Hull System

Research on MDO of Ship Propulsion Shafting Dynamics Considering the Coupling Effect of a Propeller-Shafting-Hull System

Partial Frequency Assignment for Torsional Vibration Control of Complex Marine Propulsion Shafting Systems

Investigation of the effect of rotation speed on the torsional vibration of transmission system

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