Evaluation of the increased stiffness for the elastic coupling under the dynamic loading conditions in a ship

Han, Hyung-Suk; Lee, Kyoung-Hyun; Park, Sungho

doi:10.1016/j.engfailanal.2016.06.008

Cited by 5 publications

(5 citation statements)

References 4 publications

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“…where the required parameters are represented as discrete data, l pj could be calculated utilizing equation (13) and L pj could be depicted via equation (12), with j representing the segment number in the calculation. Palmgren-Miner's linear cumulative damage criterion holds that the damage level of the inner and outer rings subjected to the rolling load increases incrementally as the number of rotations increases.…”

Section: Bearing Life Predictionmentioning

confidence: 99%

“…12 The main parameters of the driveline system were determined, then the primary vibration modes were analyzed by a dynamic model and the stress-strain characteristics of the shaft system were evaluated. 13 However, the design process did not account for the load on the bearing at critical speed, which has a significant impact on reducing bearing life. Current research on bearing life primarily focuses on data-driven life prediction 14,15 and prediction based on fatigue theory.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the shutdown process of the driveline on the generator bearing life in the diesel generator set

Song

Huang

Hua

et al. 2023

Advances in Mechanical Engineering

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Diesel generator sets are commonly used as power sources in transportation due to their versatility and cost-effectiveness. During the shutdown process, the diesel engine’s cylinder compression pressure would cause forced vibration in the driveline system through the crank linkage mechanism, resulting in unsteady loads that pose a threat to the bearing life. To address this issue, a coupling forward design method is proposed that takes into account the impact of unsteady loads on bearing life. An experiment was conducted on a 16V280 diesel generator set shutdown process, and a driveline dynamic model was established. The cumulative damage value that connects unsteady loads and bearing life was introduced to quantify the effect of unsteady loads on the bearing life during the shutdown process. The unsteady loads included torque fluctuation and collision forces. The results showed that reducing the driveline key gap and increasing the coupling stiffness can decrease the combined load on bearings and improve bearing life. A large stiffness coupling was designed to achieve shutdown smoothness and a 43.19% reduction in bearing life damage, confirming the design method’s feasibility concerning bearing life.

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Section: Bearing Life Predictionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of the shutdown process of the driveline on the generator bearing life in the diesel generator set

Song

Huang

Hua

et al. 2023

Advances in Mechanical Engineering

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“…After computing the static load torque according to Equation ( 10), the value of overpressure p TC needed for obtaining the desired constant twist angle ϕ const , using Equations ( 11)- (12), where the desired constant twist angle ϕ const is set instead of the static twist angle ϕ stat , can be expressed as follows:…”

Section: Description Of the Constant Twist Angle Control System Functionmentioning

confidence: 99%

“…Due to high temperatures, the used liquid may solidify, causing the damper to lose its function completely [9]. Flexible couplings with rubber elastic elements can significantly change their properties depending on the static torque, operating temperature, the number of operating cycles during operation and also due to the aging of the used rubber material [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Electronic Constant Twist Angle Control System Suitable for Torsional Vibration Tuning of Propulsion Systems

Homišin

Kaššay

Urbanský

et al. 2020

JMSE

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Currently, great emphasis on reducing energy consumption and harmful emissions of internal combustion engines is placed. Current control technology allows us to customize the operating mode according to the currently required output parameters, while the tuning of mechanical systems in terms of torsional vibration is often ignored. This article deals with a semi-active torsional vibroisolation system using pneumatic flexible shaft coupling with constant twist angle control. This system is suitable, as it is specially designed, for the tuning of mechanical systems where the load torque has fan characteristics (fans, ship propellers, pumps). The main goal of this research is to verify the ability of an electronic control system developed by us to maintain the pre-set constant twist angle of the used pneumatic flexible shaft coupling during operation. The constant twist angle control function was tested on a laboratory torsional oscillating mechanical system. Presented results show that the proposed electronic control system meets the requirements for its function, namely that it can achieve, sufficiently accurately and quickly, the desired constant twist angle of the pneumatic flexible shaft coupling. It is possible to assume that the presented system will increase the technical level of the equipment where it will be applied.

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“…The vertical, transverse and torsional vibration of gear-sprag clutch system is strongly related to its natural frequency, including stiffness, damping, and components' inertial masses [1][2]. The analytical calculation of clutch's stiffness is in order to determine the root cause of increased stiffness, finally decreasing the vibration of the gear-sprag clutch system.…”

Section: Introductionmentioning

confidence: 99%

The Effect Analysis of Geometry and Load Parameters on Contact Stiffness of Sprag One-way Clutch

Liu¹,

Yan²,

Cao³

et al. 2017

Proceedings of the 3rd Annual International Conference on Mechanics and Mechanical Engineering (MME 2016)

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Abstract. The wedge-raceway contact mechanical model, considering centrifugal force of wedge and the eccentricity of the inner ring and the outer ring of the one-way clutch, is established based on Hertz contact theory. The normal contact stiffness of the sprag one-way clutch is calculated by Newton iterative method.The influence of the structure parameters including the eccentricity of the inner ring and the outer ring, labeled as e, the number of the sprags, labeled as Z, the difference of the radius between the inner race of the outer ring and the outer race of the inner ring, labeled as J, and the working condition of the clutch including the working torque labeled as T and the working speed labeled as n, to the contact stiffness of the clutch has been analyzed. The results show that the smaller e, the smaller J, the much more number of Z and the higher torque T will result the bigger stiffness, and the influence of the working speed labeled as n can be negligible.

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Evaluation of the increased stiffness for the elastic coupling under the dynamic loading conditions in a ship

Cited by 5 publications

References 4 publications

Influence of the shutdown process of the driveline on the generator bearing life in the diesel generator set

Influence of the shutdown process of the driveline on the generator bearing life in the diesel generator set

Electronic Constant Twist Angle Control System Suitable for Torsional Vibration Tuning of Propulsion Systems

The Effect Analysis of Geometry and Load Parameters on Contact Stiffness of Sprag One-way Clutch

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