Common failures of ship propulsion shafts

Vizentin, Goran; Vukelić, Goran; Srok, Mateo

doi:10.31217/p.31.2.1

Cited by 21 publications

(15 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The low value of the reference metric confirms the adequacy of the developed propulsion shaft fatigue model, which may be a prerequisite for further research on its application in diagnosing fatigue of propeller shafts of real objects [11,13].…”

Section: Final Remarks and Conclusionmentioning

confidence: 64%

Energy Analysis of the Propulsion Shaft Fatigue Process in a Rotating Mechanical System Part II Identification Studies – Developing the Fatigue Durability Model of a Drive Shaft

Korczewski

Marszałkowski

2020

Polish Maritime Research

View full text Add to dashboard Cite

The article presents a continuation of research carried out concerning identification of energy consequences of mechanical fatigue within a propeller shaft in a rotating mechanical system, while working under conditions of the loss of the required alignment of shaft lines. Experimental research was carried out on a physical model reflecting a full-sized real object: i.e., the propulsion system of the ship. It is proven, by means of an active experiment, that changes in propeller shaft deflection are reflected in the amount of dissipated kinetic energy of masses in rotational motion and the accumulated internal energy in its construction material. Adoption of a high-cycle fatigue syndrome, consisting of diagnostic symptoms determined from the action of the propeller shaft associated with the transformation of mechanical energy into work and heat, as well as with the generation of mechanical vibrations and elastic waves of acoustic emission, is proposed. To assess the diagnostic information quantity brought about by the defined features of propeller shaft fatigue, an experimental research program was developed and implemented, in which two statistical hypotheses are verified: the significance of the impact of the values enforcing the fatigue process, presented in the first part of the article, and the adequacy of the regression equation describing the fatigue durability of the propeller shaft in the energy aspect, constituting the second part of the article. This finally gives us the opportunity, after the appropriate translation of the model test results into full-sized real objects, to develop a methodology to diagnose marine propeller shaft fatigue in operating conditions. The third part of the article is devoted to this issue

show abstract

Section: Final Remarks and Conclusionmentioning

confidence: 64%

Energy Analysis of the Propulsion Shaft Fatigue Process in a Rotating Mechanical System Part II Identification Studies – Developing the Fatigue Durability Model of a Drive Shaft

Korczewski

Marszałkowski

2020

Polish Maritime Research

View full text Add to dashboard Cite

show abstract

“…A propulsion system is a critical rotary component of a ship that provides thrust to move it through the water. Just like any other rotary system, abnormal vibration is fairly common in ships' propulsion systems that often result due to dynamic imbalance [1][2]. In the mid-19th century, more flexible rotors were introduced for different types of machinery, which further increased the demand for improved dynamic imbalance methods.…”

Section: Literature Reviewmentioning

confidence: 99%

Intelligent Correction and Monitoring of Ship Propulsion Rotary Device Vibration

Ting

Lee

et al. 2022

Int. j. eng. technol. innov.

View full text Add to dashboard Cite

Field inspection is a traditional way to detect the problem of shaft imbalance or abnormal vibration in a ship propulsion system; however, the ship cannot execute any tasks or activities during calibration. This study develops a human-machine monitoring interface (HMMI) to estimate vibration abnormalities and implement an intelligent active balance correction to the propulsion system online. In this study, Arduino IDE, InduSoft, and LabVIEW are used to create a function monitored by HMMI. By comparing the abnormal vibration amplification of the moment of inertia, HMMI calculates the correct mass to reduce the vibration. The experimental results show that, after HMMI carries out continuous active balance correction online, the correction rate achieves 105.37%. This indicates that HMMI can calculate the amount of imbalance and phase angles and drive a counterweight to the correct balance position while the device is still operating.

show abstract

“…This analysis depends on the cumulative fatigue damage of the components [37]. Some important impacts that can cause shaft fatigue failure are wear and tear of the propeller shaft, corrosion effects, overloads, stress concentration, and impact loads, all of which reduce the fatigue strength of shafts [38]. When the propeller torque changes during a maneuver, fatigue damage increases in its shaft in a cumulative manner, which may lead to a fracture of the shaft.…”

Section: Fatigue Damage Due To Speed Changementioning

confidence: 99%

An Open-Water Efficiency Based Speed Change Strategy With Propeller Lifespan Enhancement in All-Electric Ships

et al. 2021

View full text Add to dashboard Cite

In recent years, utilizing the electrical propulsion system in the marine industry has become widely popular. Control of the propeller has been a high-priority design challenge in this industry. One of the essential issues in propeller control is the speed control of the ships. A suitable control strategy for the propeller should be economically-efficient while ensuring stability, reliability, and power quality of the ship's power system. This paper proposes an improved propeller control strategy for increasing/decreasing the ship's speed. This scheme consists of two strategies: a maximum acceleration strategy and an efficient operation strategy. The maximum acceleration strategy aims to quickly reach the final speed setpoint. On the other hand, the efficient operation strategy is deemed to increase the reliability and power quality of the ship power system, as well as having a slightly more acceleration than the conventional method. Moreover, a mechanical index is employed for comparing the performance of the various speed change strategies. By utilizing this index, which is known as loss of life (LoL), the effects of a speed change maneuver on the propeller shaft fatigue are analyzed and the advantage of the proposed method in enhancing the propeller lifespan is discussed. Simulations show that utilizing the proposed speed change scheme decreases the propeller mechanical wear and tear to about 1.8 percent of the conventional methods and consequently will increase its lifespan.

show abstract

Common failures of ship propulsion shafts

Cited by 21 publications

References 9 publications

Energy Analysis of the Propulsion Shaft Fatigue Process in a Rotating Mechanical System Part II Identification Studies – Developing the Fatigue Durability Model of a Drive Shaft

Energy Analysis of the Propulsion Shaft Fatigue Process in a Rotating Mechanical System Part II Identification Studies – Developing the Fatigue Durability Model of a Drive Shaft

Intelligent Correction and Monitoring of Ship Propulsion Rotary Device Vibration

An Open-Water Efficiency Based Speed Change Strategy With Propeller Lifespan Enhancement in All-Electric Ships

Contact Info

Product

Resources

About