Estimate of the fatigue life of the propulsion shaft from torsional vibration measurement and the linear damage summation law in ships

Han, Hyung-Suk; Lee, KyungHyun; Park, Sungho

doi:10.1016/j.oceaneng.2015.07.023

Cited by 31 publications

(11 citation statements)

References 11 publications

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“…Ship propulsion systems are subjected to vibrational [35], torsional [36], coupled longitudinal (axial) [37] (Figure 6), and lateral [38] loads. Vibrations can cause fracture and failure in system components or on the ship's structure, resulting in complete destruction of the propulsion system, reduction of the service life of shafts and/or their components and fatigue fracture on support brackets and/or engine mountings.…”

Section: Ship Propulsion System Failuresmentioning

confidence: 99%

Marine Propulsion System Failures—A Review

Vizentin

Vukelić

Murawski

et al. 2020

JMSE

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Failures of marine propulsion components or systems can lead to serious consequences for a vessel, cargo and the people onboard a ship. These consequences can be financial losses, delay in delivery time or a threat to safety of the people onboard. This is why it is necessary to learn about marine propulsion failures in order to prevent worst-case scenarios. This paper aims to provide a review of experimental, analytical and numerical methods used in the failure analysis of ship propulsion systems. In order to achieve that, the main causes and failure mechanisms are described and summarized. Commonly used experimental, numerical and analytical tools for failure analysis are given. Most indicative case studies of ship failures describe where the origin of failure lies in the ship propulsion failures (i.e., shaft lines, crankshaft, bearings, foundations). In order to learn from such failures, a holistic engineering approach is inevitable. This paper tries to give suggestions to improve existing design procedures with a goal of producing more reliable propulsion systems and taking care of operational conditions.

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Section: Ship Propulsion System Failuresmentioning

confidence: 99%

Marine Propulsion System Failures—A Review

Vizentin

Vukelić

Murawski

et al. 2020

JMSE

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“…The amplitude of torsional stresses induced by SSO is often small, and the failure mode of the shaft caused by SSO belongs to high-cycle fatigue of the material. The relationship between stress cycles and fatigue damage can be built based on S-N curves and the Miner rule [12]. Generally, it is necessary to carry out experiments to obtain scientific S-N curves of materials [33].…”

Section: Related Workmentioning

confidence: 99%

“…Second, the S-N curves are obtained based on the material characteristics and structure of the shafting system. Finally, the fatigue damage can be evaluated in accordance with the linear damage summation law developed by Miner [12]. The oscillation may last a few minutes or several hours and sometimes longer in practical engineering.…”

Section: F Online Evaluation Of Fatigue Damagementioning

confidence: 99%

“…There have been some studies on torsional vibration fatigue damage assessment. The safety and lifecycles of the reduction gear input shaft for diesel engines were investigated with the Soderberg plot, rain-flow cycle counting, and linear damage summation law for ships [11], [12]. For the repairs of abrasion defects in a 600 MW steam turbine, torsional stresses and fatigue were analyzed offline [13].…”

Section: Introductionmentioning

confidence: 99%

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Online Evaluation of Turbo-Generator Shaft Fatigue Damage Caused by Subsynchronous Oscillation

Chen

Zhang

2020

IEEE Access

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Subsynchronous oscillation (SSO) fault can cause torsional vibration and fatigue damage of the shafting system, thereby endanger the safe operation of the turbo-generator set. A novel framework for the online evaluation of shaft fatigue damage suffered from SSO is proposed in this paper. The main ingredients of the framework are a calculation method of the turbo-generator shaft torque, rain-flow counting method, S-N curves and linear damage accumulation law. The shaft torque calculation method, based on the measured torsional angle and generator voltage and current data, is mainly discussed. The effects of damping and electromechanical coupling under complex operating conditions are included in the measured data, and the calculated results of the torque are accurate. The novel framework was used to evaluate the fatigue damage of a 1000 MW turbo-generator shaft that suffered an actual SSO fault caused by a high-voltage direct current (HVDC) transmission system and some meaningful conclusions were given.

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“…Wang and Makis 16 obtained an autoregressive model filter to indicate the occurrence of gear shaft fault and to estimate the fault severity. Han et al 17 used the torsional vibration data to estimate the life cycles of the shaft with Soderberg's safety evaluation method and the linear summation law. In addition, the adaptive wavelet packet technology is used to diagnose the fuel injection fault of diesel engine, 18 and the artificial neural network is used to process the vibration signal to intelligently diagnose the piston knocking, 19 and to forewarn the fault.…”

Section: Introductionmentioning

confidence: 99%

A new torsional vibration coupling model for transmission system in diesel generator

Chen

Guo

et al. 2021

International Journal of Engine Research

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The coupling between the crankshaft and the camshaft is neglected before in fault diagnosis which may lead to incomplete fault information. In this paper, a new torsional coupling model of a diesel generator transmission system is proposed for fault diagnosis. The natural frequency and forced torsional vibration response of the model are obtained by the system matrix method and Newmark-β method. For the system without considering the lumped mass of camshafts, some key natural frequencies are lost. The vibration dynamics are compared for the transmission system with and without the new coupling model. And important frequency responses are missed in the spectrums of the forced torsional vibration without the new coupling model. Finally, the new coupling model is implemented in fault diagnosis and the cause of an unusual vibration fault is deduced in the simulation, which confirms the feasibility of the proposed model in fault diagnosis.

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Estimate of the fatigue life of the propulsion shaft from torsional vibration measurement and the linear damage summation law in ships

Cited by 31 publications

References 11 publications

Marine Propulsion System Failures—A Review

Marine Propulsion System Failures—A Review

Online Evaluation of Turbo-Generator Shaft Fatigue Damage Caused by Subsynchronous Oscillation

A new torsional vibration coupling model for transmission system in diesel generator

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