Journal articles: 'PROPELLER SHAFTS'

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Matveev, Victor Ivanovich, Aleksandr Anatolievich Khlybov, and Vladimir Vasilievich Glebov. "Studuing and developing methods of propeller shaft technical diagnostics." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2021, no. 4 (November 30, 2021): 52–61. http://dx.doi.org/10.24143/2073-1574-2021-4-52-61.

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The propeller shafts are the structural components that require increased attention. The results of studying the damage of propeller shafts are presented in accordance with the safety requirements (a case of the river vessels). It is shown that residual stresses greatly impact the reliability and operability of the shafts becoming a damaging factor. The residual stresses occur due to surfacing the propeller shaft by ST35 steel with SV-08A welding wire. There is considered the possibility of determining the magnitude of residual stresses by the acoustic method in the surfacing. To estimate stresses the phenomenon of acoustoelasticity was used: the dependence of the elastic waves propagation velocity on the magnitude of the acting stresses. The process of determining the acoustoelasticity coefficients was carried out using standard samples (in accordance with GOST1497). Samples modeling surfacing were manufactured and tested. Metallographic studies were carried out to assess the influence of the material composition of the propeller shaft on the structure and strength properties of the propeller shafts. The influence of the structure on the amount of residual stresses was evaluated. It has been inferred from the tests results that the speed of elastic waves depends on the residual stresses. The results of the work can be used in production conditions for the control of products made of 35 steel with surfacing. In conclusion, the proposed method can be used to determine the residual stresses directly on the propeller shafts in operation conditions during the appropriate maintenance of ships.

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Xiong, Ling, Peng Shang, and You Lin Xu. "Exact Solution of Stress and Radial Displacement of Elastic Tapered Interference Fit." Applied Mechanics and Materials 423-426 (September 2013): 1438–43. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.1438.

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Tapered interference fits, which can transfer large torques, are widely used in the connection design for propeller hubs and shafts of large vessels. In this paper, a model was developed to study the influences of torques, rotational speeds and tapers on the tapered interference fit between a propeller hub and a shaft. Using the classic elastic plane stress theory, the exact solutions of the radial stresses, tangential stresses and radial displacements of the propeller hub and shaft are derived. Then the calculation method of the magnitude of the tapered interference fit was presented. Finally taking a screw propeller system as an example, the above solutions were calculated using the numerical method. The results show that improving the stress distribution of the propeller hub is an effective approach to increase the connection strength and torque transmission capacity. If the rotation speed has to be considered, the stress and displacement would be increased significantly due to the centrifugal force. The present analytical solutions are expected to be useful in the structure design of tapered interference fits for propeller hubs and shafts.

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Kashinath H. Munde, Et al. "“Fatigue Analysis Of Epoxy Composite Material Reinforcement On Propeller Shaft”." Mathematical Statistician and Engineering Applications 71, no. 1 (January 1, 2022): 617–34. http://dx.doi.org/10.17762/msea.v71i1.2703.

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Propeller shaft, also known as propeller shaft is the most important component to any power transmission application; automotive propeller Shaft is one of this. A propeller shaft is a mechanical part that transmits the generated torque by a vehicle's engine into motive force which is usable to propel the vehicle. Substituting composite structures for metallic which is structures has many advantages because of higher specific stiffness and strength of composite materials. This work deals with the conventional replacement of steel propeller shafts with fiberglass epoxy composite propeller shaft for an automotive application. The parameters of design were optimized with the objective of minimizing the weight of a propeller shaft. The design optimization also improves the performance of propeller shaft. Present work deals with FEA analysis of composite shaft with different degree of orientation of glass fibers. It includes the modeling of shaft in CATIA. The meshing and boundary condition application will be carried using Hypermesh, Fatigue analysis of composite shaft will be carried out using ANSYS.

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Nyongesa, Antony John, Van Chien Pham, Sung Hwan Yoon, Woo-Seok Kwon, Jun-Soo Kim, Duy Nam Ngo, Jae-Hyuk Choi, Young-Yun Sul, and Won-Ju Lee. "Investigation of the Effect of Rope Cutter on Water Flow behind Ship Propellers Based on CFD Analysis." Machines 10, no. 5 (April 23, 2022): 300. http://dx.doi.org/10.3390/machines10050300.

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Small vessels operating in coastal waters are susceptible to propeller failure because of the entanglement of marine debris. Secondary accidents such as the injury of divers may also occur when removing entangling material. Rope cutters are devices used to prevent marine litter from entangling the propeller of small ships. However, installing rope cutters on propeller shafts might affect the working of the propeller. In this study, three-dimensional simulations were performed to investigate the effect of a rope cutter on flow characteristics behind the propeller. The Computational fluid dynamics (CFD) models were validated by particle image velocimetry (PIV) experiments performed in a rope cutter performance testing tank. The study results showed that the installation of a rope cutter on the propeller shaft led to an insignificant reduction in water flow velocity magnitude behind the propeller. Additionally, the effects of the rope cutter on the reductions of thrust (0.87%) and torque (0.76%) of the propeller were also negligible. However, it is very interesting to note that rope cutter installation resulted in a lower vortex formation, leading to a significant reduction in the turbulence intensity behind the propeller by 27.12%, 37.50%, and 47.29% at 100, 150, and 200 rpm propeller speed, respectively. Based on the study results, it can be concluded that rope cutters help to reduce propeller entanglements without significantly affecting the propeller’s working.

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Тарасенко, Андрей Александрович, and Александр Иванович Тарасенко. "НЕСТАЦИОНАРНЫЕ КРУТИЛЬНЫЕ КОЛЕБАНИЯ ПРОПУЛЬСИВНОГО КОМПЛЕКСА С УЧЕТОМ ВОЛНОВЫХ ЯВЛЕНИЙ В ВАЛОПРОВОДЕ И РАБОТЫ РЕГУЛЯТОРА СКОРОСТИ ДИЗЕЛЯ." Aerospace technic and technology, no. 8 (August 31, 2019): 73–77. http://dx.doi.org/10.32620/aktt.2019.8.11.

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The ship propulsion complex is considered as a torsion system with distributed parameters, consisting of flywheels (cylinder compartments, propeller) connected by shafts. Shafts can be weightless (only rigidity) or have distributed parameters. Contemporary container ships have a shaft line 120 meters long with a power of 86 MW. Such shafting is reasonable to consider as a shaft with the distributed parameters and to take into account the forces arising at an emersion and an immersing of the propeller screw, accompanied by wave effects. Also, the influence of the regulator on the condition of the shaft is considered. It was concluded that about 70 forms should be used (two of them are used). A calculation scheme and a mathematical model are proposed that allow to perform the calculations of the torsion system as a system with distributed parameters. Exposure (exit from the water) of the propeller is accompanied by a decrease in torque on it to almost zero. This condition can last several seconds and is accompanied by a decrease in temperature of the gases entering the turbine of the turbo-charging unit (low fuel supply at almost the same rotation speed). The turbo charging unit at the same time reduces its rotation speed, which leads to a drop in the pressure of the purge air. Immersion of the propeller is accompanied by a sharp increase in torque on the propeller. The speed controller gives the maximum fuel taking into account restrictions. The diesel speed begins to decrease, and the purge air pressure rises. If about 70 forms (using two) are used in the calculations arising from non-stationary torsional vibrations, then you can get a wave running along the shaft shaft both from the propeller and from the diesel engine. These waves interact with each other and lead to a three-fold increase in torque in the propeller. A rational mode of operation of the speed controller is proposed, in which several outbreaks are skipped during the immersion of the propeller. For short shafts, the delay in the regulator may be sufficient. For long, you need to take additional measures. We can conclude that when calculating non-stationary oscillations, the use of about 70 forms (using two) and the organization of the delay of the speed controller with a sharp increase in the load on the propeller.

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Sitthipong, Siva, Prawit Towatana, Amnuay Sitticharoenchai, and Chaiyoot Meengam. "Life Extension of Propeller Shafts by Hardfacing Welding." Materials Science Forum 872 (September 2016): 62–66. http://dx.doi.org/10.4028/www.scientific.net/msf.872.62.

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At present the Cut-stern Kolek Boats of local fishermen at Kaoseng Community on the Coast of Songkhla Lake have a high rate of shaft failure. Consequently, the fishermen have spent lots of money on maintenance program of repairing shafts for a few years. Besides, the repairing cost, each time of the failure also causes water pollution from the leakage of grease. The incomplete transmission of power leads to engine overloading and fuel wasting. The investigation of the high failure rate of propeller shafts which were major machine component in power transmission illustrated the failure in normal fracture caused by the mechanisms of metal fatigue. Using the welding repair by shield metal arc welding process did not give the satisfied outcome because it created the short service life of reused propeller shafts after repairing. This research was aimed to study the metal fatigue behavior of long tail shafts in the Cut-stern Kolek boats and introduce the new method of welding repair process to prolong their service life. The experiment revealed that specimens resulted from the new welding repair process and the conventional one possessed different service life. The new process used the flux core which arc welding can prolong the service life of the shafts of boats more than 1.6 times of using the conventional method which is the electric welding by flux core arc welding. The research result will be extended to fishermen, in order to encourage them to become a part of sustainable inshore fisheries.

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Sitthipong, Siva, Prawit Towatana, Amnuay Sitticharoenchai, and Chaiyoot Meengam. "Fatigue Life Evaluation of Weld Surfacing LB 52 Grade." Key Engineering Materials 744 (July 2017): 259–63. http://dx.doi.org/10.4028/www.scientific.net/kem.744.259.

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The damage to the propeller shaft, a principal mechanical component in the power transmission system of Boats makes engines work harder than normal attributed to less transmission efficiency. Operating boats with the damaged propeller shaft increases the rate of fuel consumption per distance and cost of fishing which affects income of coastal fishermen. The result of a preliminary survey of Boats at Kaoseng Community revealed that the service life of the damaged propeller shafts caused by the fatigue failure would be repaired by shield metal arc welding process. The statistical analysis showed that the useful life depended on fatigue endurance limit of welding surface. When they were back to be used again. The objective of this research was to study the fatigue life of hardfacing surface by solid wire. The method of this research included (a) building up the hardfacing surface (b) forming specimen from hardfacing surface and (c) finding out the fatigue life by fatigue testing machine base on ASTM E739-91 standard. The results of this research indicated that hardfacing surface by solid wire could not receive fatigue stress exceed 500 MPa. The propeller shafts after being repaired will have very short service life, which is not feasible in engineering economy.

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Stan, Liviu-Constantin, and Daniela-Elena Juganaru. "COMPARATIVE STUDY ON THE DISPLACEMENTS, EQUIVALENT ELASTIC STRAIN AND EQUIVALENT STRESS OF THE PROPELLER SHAFT AT DIFFERENT OPERATING MODES." International Journal of Modern Manufacturing Technologies 14, no. 2 (December 20, 2022): 234–39. http://dx.doi.org/10.54684/ijmmt.2022.14.2.234.

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This study presents the sizing calculation and the FEM analysis of the propeller shaft for three different operating modes. The propeller shaft has the role of supporting the engine and transmitting its rotating motion and is the most requested element in the structure of the shaft line. In scenario 1, a "fixed support" type constraint is applied at one end and the maximum torque given by the motor at the other end is applied to lock the propeller. Than to simulate scenario 2, apply the maximum thrust force to the propeller at one end, and the "fixed support" constraint will be inserted at the end of the engine. And the 3 th scenario was the operating of propulsion system in normal mode. Comparing the results from the simulation of the three scenarios, it is observed that the maximum values recorded for displacement, equivalent elastic strain and equivalent stresses were recorded at the engine operation under normal conditions. In conclusion, although the scenarios were a bit exaggerated, the propeller shaft withstood the efforts, falling within the limit of elasticity. This demonstrates that the calculation method of propeller shafts is correct, and safe, as long as their size is not oversized.

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Zhao, Xiao Qing, and Peng Shang. "Exact Solution of Stresses of Tapered Interference Fit." Applied Mechanics and Materials 556-562 (May 2014): 4284–87. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.4284.

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Tapered interference fits can avoid the influence of keyways on the parts strength and transfer large torques. In this paper, a model was developed to study the influence of the taper on the interference fit between a propeller hub and a shaft. Using the classic elastic plane stress theory, the exact solutions of the radial stresses, tangential stresses and radial displacements of the propeller hub and shaft are derived. Then the calculation method of the magnitude of the tapered interference fit was presented. Finally taking a screw propeller system as an example, the above solutions were calculated by using the numerical method. The results show that the taper plays a key role in the interference fit. Improving the stress distribution of the propeller hub is an effective approach to increase the connection strength. The present analytical solutions are expected to be useful in the structure design of tapered interference fits for propeller hubs and shafts.

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10

Brunelli, P. E. "THE CRITICAL SPEED OF PROPELLER SHAFTS." Journal of the American Society for Naval Engineers 33, no. 4 (March 18, 2009): 711–19. http://dx.doi.org/10.1111/j.1559-3584.1921.tb04935.x.

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11

Baz, A., J. Gilheany, and P. Steimel. "Active vibration control of propeller shafts." Journal of Sound and Vibration 136, no. 3 (February 1990): 361–72. http://dx.doi.org/10.1016/0022-460x(90)90450-e.

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Sibryaev, Konstantin Olegovich, Maxim Michailovich Gorbachev, and Adel Damirovich Ibadullaev. "DEVELOPING INFORMATION PROCESSING UNIT USED IN SOFTWARE AND HARDWARE COMPLEX MONITORING SHIP SHAFT LINE TORSIONAL VIBRATIONS." Vestnik of Astrakhan State Technical University 2021, no. 1 (May 31, 2021): 22–28. http://dx.doi.org/10.24143/1812-9498-2021-1-22-28.

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The article considers torsional vibrations in combination with other technical factors, which remain a cause of damages and breakdowns of the ship's propeller shafts, intermediate shafts and crankshafts. Torsional vibrations inevitably occur in the ship plants. It can be explained by the uneven torque of the engine and the torque on the propeller (exposure of the propeller, uneven movement of the water flow, stormy weather, etc.), which leads to alternating twisting of the shaft. To reduce torsional vibrations, dampers are used, which require periodic performance testing by using the torsiography procedure. In contrast to the existing monitoring systems of the technical condition of the damper, it is planned to install an information processing unit for the software and hardware complex for monitoring torsional vibrations of the ship's shaft line and the parameters associated with them (vibration and temperature changes of the flexible elements of the connecting couplings). The unit under development will allow to constantly monitor the level of torsional vibrations and, if they increase, to signal the ship's mechanic to switch to another operational mode of the main engine, which will increase the reliability and automation of the ship power plants, the safety of navigation, and reduce the economic costs of ship operating

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Hruby, Petr, Tomas Nahlik, and Dana Smetanova. "Mathematical Modelling of Shafts in Drives." Communications - Scientific letters of the University of Zilina 20, no. 4 (December 31, 2018): 36–40. http://dx.doi.org/10.26552/com.c.2018.4.36-40.

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Propeller shafts of the vehicle's drive transmit a torque to relatively large distances. The shafts are basically long and slender and must be dimensioned not only in terms of torsional stress, but it is also necessary to monitor their resistance to lateral vibration.In the paper, a simple model (of the solved problem) is constructed by the method of physical discretization, which is evident from the nature of the centrifugal force fields' influence on the spectral properties of the shaft. An analytical solving of speed resonances prop shafts test model (whose aim is to obtain values for verification subsequently processed models based on the transfer-matrix method and the finite element method) is performed.

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Conti, Fosca, Abdessamad Saidi, and Markus Goldbrunner. "Evaluation Criteria and Benefit Analysis of Mixing Process in Anaerobic Digesters of Biogas Plants." Environmental and Climate Technologies 24, no. 3 (November 1, 2020): 305–17. http://dx.doi.org/10.2478/rtuect-2020-0105.

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AbstractA valid method to evaluate decisions of a project proposal is the so-called cost-benefit analysis. Criteria are selected and properly weighted to determine if the project is effective and feasible. The present research study is focused on methodical selection of design parameters to install two propeller mixers inside anaerobic digesters of biogas plants. A cylindrical tank of 1400 m3 was considered. For the model-based optimisation, the substrate was considered as a non-Newtonian fluid with a density of 1090 kg/m3. The Oswald-de Waele power-law model was selected to account for the rheological behaviour of the fluid. Installation parameters of the mixers were rotational angles and heights of the shafts of the two propellers. A computational model was developed to simulate the fluid dynamics depending on the mixing process inside the tank. Several configurations were analysed according to evaluating criteria such as the value of the fluid velocity, its distribution along the three spatial dimensions, and the power consumption to rotate the mixers. The maximum fluid velocity and minimum power consumption were observed when the propellers are located at intermediate height inside the tank and with the shafts perpendicular to the tank radius. With this configuration, the fluid reaches a maximum velocity of 0.28 m/s. According to the investigation, it is evident that mixing systems with propeller shafts deep-seated and parallel to the tank radius should be avoided, both in term of efficiency of the fluid mixing distribution and in term of power consumption.

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Хвагин and Vladimir Khvagin. "About Inspection of Marine Shafts and Workpieces." NDT World 18, no. 4 (December 16, 2015): 49–53. http://dx.doi.org/10.12737/16311.

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Introduction to the article gives the overview of vessels’ nowadays condition and emphasizes the necessity of their inspection. The article presents the operational procedure for inspection of blanks for shafts and rudder stocks as well as estimates the capabilities of shipyards to fulfill the inspection. Ways and techniques for different types defect detection are given; the necessary equipment is described; methodology peculiarities for flaw detector adjustment are indicated; recommendations for transducer selection are presented. The standard specimens used for workpiece inspection are described in detail. For used propeller shafts the procedure of preparation a shaft for testing is given as well as the sequence of testing operations including those for shafts with pressed-on bushes. Schemes for base metal testing of shafts, key-seats, shafts with pressed-on bushes, fillet zones are also presented. The article also indicates the regulatory documents according to which the quality of workpieces of shafts and used shafts should be estimated. It is shown by the real examples that timely fulfilled testing prevents emergency situations. The offered testing techniques ensure detection of inadmissible defects.

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Gontarz, Andrzej, Zbigniew Pater, Janusz Tomczak, and Grzegorz Winiarski. "Theoretical and Experimental Research on a Method for Producing a Triangular Rosette-Shaped Flange." Key Engineering Materials 622-623 (September 2014): 1166–72. http://dx.doi.org/10.4028/www.scientific.net/kem.622-623.1166.

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The paper presents a new method for forming a hollow shaft with a triangular rosette-shaped flange on its end. The part being investigated is used as a propeller shaft in helicopters. The product must be monolithic, therefore it cannot be produced by methods which consist in joining a flange with a tube. Up till now, such shafts have been produced by machining from solid barstock, the process which generates material losses exceeding 90%. The application of the proposed flanging method results in a significant reduction in both material and labour consumption, which leads to lower production costs. Due to beneficial texture of the shaft flange, shafts produced by this method exhibit better strength properties than shafts produced by machining. The paper presents the results of a numerical analysis of the flanging process, performed using DEFORM-3D software. Also, experimental tests were conducted using a three-slide forging press. Theoretical and experimental results obtained confirm the effectiveness of the new method for forming this part.

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Kushner, G. A. "Dynamic strain measurement of propeller shaft vibrations." Journal of Physics: Conference Series 2091, no. 1 (November 1, 2021): 012050. http://dx.doi.org/10.1088/1742-6596/2091/1/012050.

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Abstract The paper proposes an approach to the registration of vibrations parameters to increase the reliability and predict the durability of technical systems with a continuously rotating shaft. For systems with stochastic loads, such as a ship’s shaft line, the actual measurement of shaft stresses and deformations is an actual way to prevent failures and non-destructive testing under operating conditions. The adaptation of the dynamic strain measurement method made it possible to develop a software and hardware complex for recording and analysing transverse, torsional and longitudinal vibrations of shafts. The design of a hardware complex consisting of a measuring mobile and stator modules connected by a wireless network that allows dynamic strain measurement is proposed. The connection diagram and the main metrological and technical characteristics of the modules are given. To test the operability of the hardware complex, an experimental installation was built that allows carrying out investigation of the shaft line vibrations in real operation conditions. Experimental data are presented, the analysis of which allows us to predict the durability of the system.

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Madokuboye, Asima, and Alfred E. Ogbonnaya. "Vibration Analysis of A 3-Bladed Marine Propeller Shaft for 35000DWT Bulk Carrier." European Journal of Engineering Research and Science 4, no. 10 (October 19, 2019): 78–86. http://dx.doi.org/10.24018/ejers.2019.4.10.914.

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Vibration Analysis of a 3-bladed Marine Propeller shaft for 35000 DWT Bulk Carrier was carried out. The objectives of the analysis were mathematically designing the 3-bladed propeller shaft, carrying out computer aided design of the shaft and numerically performing vibration analysis. The methodology include mathematically designing the marine propeller and the corresponding shaft, manual calculation of the natural frequency of the shaft, using solidworks to design the shaft and numerically performing vibration analysis on the designed shaft using Analysis System (ANSYS) software. Hub (boss) diameter of 0.17m was calculated. The hollow shaft has external and internal diameters of 0.10m and 0.09m respectively. Torques of 202Nm2 and 384.72Nm2 were obtained at the driver and driven shafts respectively. The natural frequency calculated manually was 249Hz while that of the ANSYS was 280Hz which gives an error of 12%. However, the numerical analysis carried out with ANSYS software also showed that a phase difference of 1800 occurs at the frequency of 280Hz which is a signal of possible misalignment of shaft. At this frequency, the displacement of the shaft has a maximum value of 7.87 . Reaction forces from the components of the shaft were also observed to play major role in the vibration of the propeller shaft. These reaction forces, which cause wearing of the stern tube and intermediate bearings due to friction, are represented by phase angles closer to zero degree. Wear due to friction is a major source of shaft misalignment.

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Madokuboye, Asima, and Alfred E. Ogbonnaya. "Vibration Analysis of A 3-Bladed Marine Propeller Shaft for 35000DWT Bulk Carrier." European Journal of Engineering and Technology Research 4, no. 10 (October 19, 2019): 78–86. http://dx.doi.org/10.24018/ejeng.2019.4.10.914.

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Vibration Analysis of a 3-bladed Marine Propeller shaft for 35000 DWT Bulk Carrier was carried out. The objectives of the analysis were mathematically designing the 3-bladed propeller shaft, carrying out computer aided design of the shaft and numerically performing vibration analysis. The methodology include mathematically designing the marine propeller and the corresponding shaft, manual calculation of the natural frequency of the shaft, using solidworks to design the shaft and numerically performing vibration analysis on the designed shaft using Analysis System (ANSYS) software. Hub (boss) diameter of 0.17m was calculated. The hollow shaft has external and internal diameters of 0.10m and 0.09m respectively. Torques of 202Nm2 and 384.72Nm2 were obtained at the driver and driven shafts respectively. The natural frequency calculated manually was 249Hz while that of the ANSYS was 280Hz which gives an error of 12%. However, the numerical analysis carried out with ANSYS software also showed that a phase difference of 1800 occurs at the frequency of 280Hz which is a signal of possible misalignment of shaft. At this frequency, the displacement of the shaft has a maximum value of 7.87 . Reaction forces from the components of the shaft were also observed to play major role in the vibration of the propeller shaft. These reaction forces, which cause wearing of the stern tube and intermediate bearings due to friction, are represented by phase angles closer to zero degree. Wear due to friction is a major source of shaft misalignment.

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Bhiogade, Girish, and Jiwak G. Suryawanshi. "Investigations on Dynamic Analysis of Propeller Shaft." Applied Mechanics and Materials 592-594 (July 2014): 1225–34. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.1225.

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In recent years investigation of torsional vibration characteristics of the shaft systems transmitting torque, has become important part of the designer’s responsibility. Satisfactory operation of heavy duty transmission system may depend to a large extent upon the successful handling of the vibration problem. Propeller shaft of most of the vehicles are found to show number of modes of failures. Most destructive failure after thorough study of the system involving Propeller shaft is rupture of tubes & excessive bending caused due to torsional shear stresses that get imposed during running time of propeller shaft. Based upon above problem, new methodology has been devised to come up with new technique for determination of torsional stresses across cross sections of the shafts. TATA LP/LPO 1510 model chosen for the propeller shaft analysis and data provided by M.S.R.T.C. workshop bhandara (M.S.). Frequency response analysis (FRA) that has been worked out in found to show number of failures modes, each mode being representation of operation speed which is equal to excited natural frequency. Predicted frequency range is having excellent with practical results. Stresses that are obtained are of low magnitude (torsional stresses) but effect of this low modal amplitude will be excessive bending of shaft which causes the bending stresses of 72 N/mm2 while permissible is 83.7 N/mm2.

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Sitthipong, S., P. Towatana, and A. Sitticharoenchai. "Failure analysis of metal alloy propeller shafts." Materials Today: Proceedings 4, no. 5 (2017): 6491–94. http://dx.doi.org/10.1016/j.matpr.2017.06.158.

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Mohammed, Salsabil karim. "Effect of piezoelectric material on vibration of vessel of marine transportation." Journal Port Science Research 4, no. 2 (November 11, 2021): 34–39. http://dx.doi.org/10.36371/port.2021.2.1.

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The drive arrangement of normal marine vessels involves a propeller coupled to a progression of shafts and diary orientation which is at last associated with a push bearing which sends the propeller pivotal power into the frame of the boat through a push block coupled to the mass head. For effortlessness, the framework is improved to a propeller, a solitary shaft, diary bearing and a push bearing. As the vessel travels through the sea, a wake is produced. This non-uniform wake field is the inflow to the propeller. The power produced by the propeller is additionally non-uniform. The impetus arrangement of a marine vessel is the principle supporter of commotion emanated from the vessel. It is along these lines important to diminish the commotion sent from the propeller into the sea and consequently the vibration that is created by the propeller that is thus communicated into the body. The inspiration for lessening commotion and vibration remembers diminishing mechanical wear for segments, expanding secrecy limit of military vessels, improving traveler and group solace, and decreasing the effect on marine conditions. The point of this theory is to dissect the shaky power created by the propeller, the power transmission ways, and techniques to quantify the power transmission through the push bearing continuously.

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Prakash, Ravi, and Arun Patel. "Review and Analysis of Various Composite Propeller Shaft." SMART MOVES JOURNAL IJOSCIENCE 5, no. 4 (April 28, 2019): 5. http://dx.doi.org/10.24113/ijoscience.v5i4.198.

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The replacement of conventional steel driveshaft of automobiles with an appropriate composite driveshaft with different combinations of fibers at a time. For reducing the bending natural frequency the conventional steel shafts are made in two pieces, where to reduce the overall weight the composite material drive shaft is made in single piece. Various composites can be designed and analyzed for their appropriateness in terms of torsional strength, bending natural frequency and torsional buckling by comparing them with the conventional steel driveshaft under the same grounds of design constraints and the best-suited composite will be recommended. Light has been thrown upon the aspects like mass saving, number of plies and ply distribution.

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Tsarenko, Sergey N., Gennadiy M. Ulitin, and Sergei Yu Trudnev. "PROPELLER SHAFTING DYNAMICS UNDER IMPULSE ACTION." Vestnik Gosudarstvennogo universiteta morskogo i rechnogo flota imeni admirala S. O. Makarova 14, no. 5 (December 14, 2022): 748–58. http://dx.doi.org/10.21821/2309-5180-2022-14-5-748-758.

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Propeller shafts and countershafts are bent quite often on sea and river vessels. The cause of the curvature is a strong load on this node of the ship’s power plant. In addition to bending, the shafting experiences longitudinal and transverse loads with a dynamic and static component. A large number of scientific papers have been devoted to the study of the dynamics of the propeller and shafting. However, the problem has not been completely solved, and the increase in damages during the shafting operation and its intensive wear only confirm the relevance of further research in this direction. The aim of the work is to determine the dynamic forces in the shafting, which occur during impulse action due to the propeller impact on the ice. A model of a two-stage elastic rod with inert disks at the ends is presented in the paper. It allows considering different situations of dynamic impact on the shafting and propeller. The following design features such as different stiffness of the shaft sections, different speed of elastic waves of deformation (different densities and modules of elasticity on the shaft sections), reduced inertial load from the moving parts of the drive, can be taken into account in the model. It is concluded that the frequency of the main form of oscillations mainly depends on the inertial loads concentrated at the ends and the shaft rigidity. The proposed simplified model of the inertialess shaft makes it possible to determine the angles of rotation of the shaft sections with sufficient accuracy. For different sections of the stepped shaft, the dynamic torque coefficient can differ significantly.

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Liu, Gang. "Study on Torsion Vibration of Ship’s Complex Shaf." Applied Mechanics and Materials 397-400 (September 2013): 365–68. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.365.

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The method of transfer matrices used for torsion vibration of ships complex shafts was analyzed, and various simplified models of transfer matrices were obtained by building a hybrid model for lumped parameter elements and distributed parameter elements. Based on the above, verified by an example of a complex shaft with one propeller driven by two turbines, the method of simplifying model was provided by analyzing the calculation results on the different simplified models.

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Welke, Met. "Shaft Alignment Monitoring Using 3D-Coordinate Measurement on the Heavy Icebreaker CCGS Louis S. St. Laurent." Marine Technology and SNAME News 31, no. 03 (July 1, 1994): 238–43. http://dx.doi.org/10.5957/mt1.1994.31.3.238.

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A detailed description of 3D-coordinate measurement for shaft alignment monitoring is presented. The method was used at Halifax-Dartmouth Industries Ltd. (HDIL) during mid-life modernization and refit of a heavy icebreaker, CCGS Louis S. St. Laurent. The vessel was undergoing substantial repairs of its steel structure, a significant part of which was concentrated in way of the propeller stern tubes and shaft line foundations. The application of an electronic theodolite allows measurement of the exact position of nine points along each of the three shafts within half an hour.

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Litwin, Wojciech, and Artur Olszewski. "Assessment of possible application of waterlubricated sintered brass slide bearing for marine propeller shaft." Polish Maritime Research 19, no. 4 (December 1, 2012): 54–61. http://dx.doi.org/10.2478/v10012-012-0040-4.

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ABSTRACT Water-lubricated bearings have been applied to support ship screw shafts for over a hundered years. Development of plastic materials has caused that novel sliding polymers appeared available on the market and being approved by classification institutions, possible to be applied in shipbuilding. However in the subject - matter literature there is no reference to application of bearings fitted with metal or ceramic bushes in shipbuilding. Nevertheless they have important merits such as low resistance to motion, long service life or stability of form. But some doubts are evoked by their large value of shape elasticity module which can lead to local stress concentration at the bush edges in the case of non-axiality of bush and shaft axes. Hence this work has been aimed at the testing of a bearing made of bronze-graphite silter. In the work is presented a comparison of measurement results of resistance to motion , hydrodynamic pressure distributions in lubricating film as well as shaft axis trajectories of the bearing, with those made for a typical elastic polymer bearing. The measurement results have showed high quality of the tested material. In the opinion of these authors it could be applicable to bearing ship propeller shafts.

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Kushner, Guriy Alekseevich, Victor Andreevich Mamontov, and Dmitry Aleksandrovich Volkov. "Analysis of damage and failure of ship propulsion shafts." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2021, no. 3 (August 31, 2021): 33–39. http://dx.doi.org/10.24143/2073-1574-2021-3-33-39.

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The paper highlights the problem of a ship shaft line failure, which entails significant economic losses, because most vessels of the Russian fleet are equipped with a shaft line. A large number of domestic and foreign works are devoted to studying the causes of damage and failures of ship shafting. The complexity of collecting, systematizing and analyzing statistical data on breakdowns and damages of shafting lies in the fact that the data refer to different periods of time, different periods of operation and types of ships, and are also contained in various sources. There has been considered the approach to systematization of modern statistical data on damages and failures of ship shafting elements collected on the basis of defect-technological lists of the Astrakhan shipyards and from other sources. Information on breakdowns of ships, their elements and ship shaft lines within 2010 - 2019 provided by the Russian River Register of Shipping is given. The analysis of accidents on ships of the class of the Russian Maritime Register of Shipping. The places of occurrence and the nature of the propeller shaft cracks have been established, which makes it possible to assess the nature and magnitude of the destructive loads, as well as the real safety margins. The general classification of the location of the propeller shaft cracks in the order of the frequency of their occurrence is given. There have been shown the results of the analysis of defect-technological lists, which make it possible to establish the causes of ship shafting failures, which led to emergency repair, and the most common defects identified during the scheduled dock repair of ships. The influence of the diameter of propeller shafts on the nature and size of defects, as well as the frequency of their manifestation, is estimated. Based on the results of the analysis, certain measures have been proposed to reduce the number of accidents in shafting of projected vessels, and the most promising directions for improving the already developed structures of shafting in operation are outlined. The results of the analysis are in addition to the ongoing research and development work to improve the reliability of ship power systems.

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Prakash, Ravi, and Yogesh Mishra. "Analysis of Automobile Shaft for Optimizing Weight by Using Fem." SMART MOVES JOURNAL IJOSCIENCE 5, no. 10 (October 18, 2019): 24–35. http://dx.doi.org/10.24113/ijoscience.v5i10.229.

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Composites have been increasingly used in many engineering fields. Polymer composites are now widely used to build automotive components due to their exceptional rigidity and strength properties. Composite shafts for automotive applications are among the most recent research areas. A weight reduction can be achieved mainly with the introduction of a better material. The conventional system uses a metal shaft and has inherent limitations such as weight, corrosion, elasticity, vibration, storage and manufacturing problems increase with increasing shaft diameter. Advanced composites offer the opportunity to improve the transmission shaft by reducing weight, bearing load, misalignment and life cycle costs through the use of strategic materials, increasing the properties of resistance to fatigue, flexibility and vibration damping. The objective is the design and analysis of composite hollow shafts made of low density carbon fiber reinforced plastic (CFRP) for motor vehicles. And To investigate the vibrational effect of propeller shaft at different mode condition using FEA by ANSYS 18.2. In this result are the total weight of carbon fiber shaft is reduce. The total weight of the carbon fiber shaft is 2.6 kg is less then to previous material. And the previous study material of weight is 3.2kg.

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Mohamad Fajri Hamdani and Eidelweis Dewi Jannati. "PROSES PEMBUATAN POROS TURBIN PROPELER DENGAN BAHAN BAJA KARBON RENDAH ST.37 DI LEMBAGA ILMU PENGETAHUAN INDONESIA." SEMINAR TEKNOLOGI MAJALENGKA (STIMA) 6 (December 8, 2022): 302–11. http://dx.doi.org/10.31949/stima.v6i0.694.

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The shaft is a rotating stationary member, usually spherical in cross section, the shaft may receive bending loads, tensile loads, compressive loads or torsional loads acting alone or in combination with one another. The propeller turbine shaft is made using a conventional lathe from the Indonesian Institute of Sciences (LIPI). The shafts made have stratified diameters with diameters of 8 mm, 10 mm, 15 mm and 24 mm with an overall length of 595 mm and has a thread in one part of the shaft. The axle uses ST.37 material, dural rod material and for the outside of the shaft (casing) using aluminum. Dural is a high strength aluminum based alloy with the addition of copper, magnesium and manganese.

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Sazonov, K. E. "Determination of ice-induced anti-torque of propeller." Transactions of the Krylov State Research Centre 2, no. 404 (June 6, 2023): 68–78. http://dx.doi.org/10.24937/2542-2324-2023-2-404-68-78.

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Object and purpose of research. This paper discusses the methods for determination of propeller anti-torque in ice milling conditions. The purpose of the study was to investigate existing methods for propeller anti-torque determination, analyse their respective pros and cons and to trace out the paths of further studies towards a satisfactory description of propeller anti-torque. Materials and methods. This study relies on previous publications and experimental ice milling data from both laboratory tests and field measurements, as well as on full-scale measurement data obtained on propulsion shafts of real icebreakers and ice-going ships. Main results. Currently, there is a wide variety of methods for obtaining anti-torque data: regulatory, theoretical, model testing and full-scale measurements on ship shafting. Analysis of the regulations given in the recommendations of various class societies has shown considerable drawbacks in the calculation formulae used in them. This paper proves that the most viable method for propeller anti-torque determination is its reconstruction as per the results of full-scale measurements on shaft line. Conclusion. Current methods for determination of anti-torque do not describe this phenomenon exhaustively. The most promising solution here would be to perform full-scale trials and analyse their results.

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M.N., Chura, and Fayvisovich A.V. "To assess the operational life of ship's propeller shafts." Operation of Maritime Transport 3, no. 96 (September 30, 2020): 123–27. http://dx.doi.org/10.34046/aumsuomt96/17.

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33

Kim, Jin Kook, Dai Gil Lee, and Durk Hyun Cho. "Investigation of Adhesively Bonded Joints for Composite Propeller Shafts." Journal of Composite Materials 35, no. 11 (June 2001): 999–1021. http://dx.doi.org/10.1106/j5qd-b843-qexc-18eb.

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34

Kim, Jin Kook, Dai Gil Lee, and Durk Hyun Cho. "Investigation of Adhesively Bonded Joints for Composite Propeller Shafts." Journal of Composite Materials 35, no. 11 (June 1, 2001): 999–1021. http://dx.doi.org/10.1177/002199801772662406.

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35

Симутенков, Иван, Ivan Simutenkov, Станислав Драган, Stanislav Dragan, Жорж Голобородько, Zhorzh Goloborodko, Владимир Лебедев, Юрий Ярос, and Yuriy Yaros. "Improvement of automatic surfacing technique under flux at ship propeller shaft repair." Science intensive technologies in mechanical engineering 1, no. 9 (August 23, 2016): 42–48. http://dx.doi.org/10.12737/21239.

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During the operation of surfaces in ship propeller shafts they are worn out intensively. To prolong their life there are used at shipyards an automatic surfacing under flux (ASF) which, besides high efficiency is characterized with a considerable share of a basic metal participation in surfacing worsening properties of a deposited layer. The aim of the paper consists in the technology improvement of ship propeller shafts restoration with the aid of ASF and SBM decrease on the basis of complex mechanization and energization of a technological process. The process energization consists in the transfer character control of electrode metal through an arc by geometry and properties of driven rollers at the expense high-frequency extra-axial oscillations of an electrode (EOE) created by a special mechanical generator. The developed ASF technology ensures pad quality meeting requirements of the Register.

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36

Liang, Xing Xin, Zheng Lin Liu, and Jiao Liu. "Analysis of Pre-Tightening Strength of Ship Tail Shaft Coupling Based on Workbench Software." Applied Mechanics and Materials 496-500 (January 2014): 1028–31. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.1028.

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Coupling is mostly used for the connection of two shafts, widely in ship machinery. Because the vibration and impact of propeller under alternating load, the tail shaft work conditions are harsh, pre-tightening force plays an important role in the performance of tail shaft coupling. In this paper, based on conventional coupling, achieve pre-tightening by applying pre-tightening lock bolt at the circumference of pre-tightening nut, determine the pre-tightening force according to empirical formula, analyse the pre-tightening strength by using of Workbench finite element software, get the stress distribution of related parts, to explore the effect of pre-tightening force on the stress of related parts of coupling.

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37

Matuszewski, Leszek. "New Designs of Centrifugal Magnetic Fluid Seals for Rotating Shafts in Marine Technology." Polish Maritime Research 26, no. 2 (June 1, 2019): 33–46. http://dx.doi.org/10.2478/pomr-2019-0023.

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Abstract The centrifugal magnetic fluid seals have important advantage over the conventional centrifugal seals. They maintain very good sealing capacity at static, medium and high speeds of shaft rotation, with the increased seal lifetime, and minimum torque and static friction. These seals are particularly useful in cases when the angular shaft velocity varies and sometimes decreases to nearly or exactly zero, such as in flywheel applications, ship propeller main shafts, etc. Unique properties of the magnetic fluid give rare opportunities for application in marine design, where perfect sealing together with reliable lubrication are required. The paper presents a typical design and operation principle of a centrifugal magnetic fluid shaft seal, along with new design solutions. Not only in ocean technology and underwater robotics. Some cases of application of centrifugal magnetic fluid seals in modern sealing technology are included.

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38

Roldo, Liane, and Nenad Vulić. "Implementation Of A Systematic Materials Selection Method In The Preliminary Design Of Propeller Shafts." Pedagogika-Pedagogy 93, no. 6s (August 31, 2021): 196–203. http://dx.doi.org/10.53656/ped21-6s.17imp.

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The materials selection charts also known as “Ashby” charts are a versatile tool in engineering design. The use of such material property charts is due to technical difficulties in specifying properties during the design of a complex and major component as in the case of a propeller shaft. In addition, the tool combines innovation, minimizes design failures and practicality to technology. The aim of the research is to present the methodology for selecting the most convenient material for a given shaft and its performance. Using a propeller shaft as showcase, the method is based on the analysis of the materials selection charts and of the material performance index of EDUPACK from GRANTA Design. The required properties may be: tensile strength, yield strength, fatigue strength, impact strength and resistance to corrosion, where not all of them are necessarily explicitly expressed. The Ashby charts, with their consistent results seem to be the proper tool for the eventual future proposal for the extension the UR M68 formula for the propeller shaft diameter to stainless steels.

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39

Aleksandrov, Anatoliy V., and Trifon R. Rybalko. "Numerical simulation of transient processes in propeller shaft straining under ice loads." Transactions of the Krylov State Research Centre 4, no. 394 (November 25, 2020): 70–75. http://dx.doi.org/10.24937/2542-2324-2020-4-394-70-75.

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Object and purpose of research. The object of the research is the shaftline of an icebreaker and ice-going vessels, the purpose is to develop an algorithm for determining the loads for calculating the strength of the shafts of icebreakers and icegoing vessels under ice loads in a nonlinear dynamic setting and determining the dynamic magnification factor. Materials and methods. The study is based on finite element method (FEM). Main results. As a result of numerical analysis, the magnification factors of ice loads acting on the propeller shaft when vessel moves in an ice field up to 4 m thick are investigated. Conclusion. The research results can be used to calculate the fatigue strength of the icebreakers and ice-going vessels shaftlines.

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40

Kushner, Guriy Alekseevich, Victor Andreevich Mamontov, and Dmitry Aleksandrovich Volkov. "Methods of determining hydrodynamic bending moments having effect on ship shaft." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2020, no. 3 (August 19, 2020): 47–53. http://dx.doi.org/10.24143/2073-1574-2020-3-47-53.

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The paper considers the problem of engineering systems design in modern shipbuilding, which is based on using the computer-aided design systems. In today’s environment, not all engineering calculations can be implemented in the form of an algorithm for a specific design procedure. One of these calculations is determining the resonant frequency of transverse vibrations of a ship shaft line. Analyzing the parameters of such a dynamic system is a serious task even at the stage of preliminary design. The urgent task in the design and strength calculations of the shaft line is to calculate the hydrodynamic bending moments resulting from the operation of the propeller in an uneven velocity field. There has been presented a software implementation of the semi-empirical methodology for determining the hydrodynamic bending moments acting on ship shaft lines. The main principles of the methodology, the initial data on the vessel hull, and the quantities characterizing the operating mode of the propeller are described. There is proposed a sequence and software implementation of the method for determining hydrodynamic bending moments in the environment of Maple computer algebra. The problem of representing empirical data in the form of bilinear interpolation and interpolation polynomial is solved. The results of a numerical experiment to determine the constant and amplitude values of the hydrodynamic bending moments for shaft shafts of full-scale vessels are presented. The software implementation of the technique proposed made it possible to automate the process of determining external forces in the calculations of the cyclic strength of the propeller shaft at the early stages of the design of the vessel. The research results are in addition to existing automation tools.

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41

Lovekin, Luther D. "THE LOVEKIN IMPROVED INBOARD COUPLING FOR LINE AND PROPELLER SHAFTS." Journal of the American Society for Naval Engineers 18, no. 2 (March 18, 2009): 546–52. http://dx.doi.org/10.1111/j.1559-3584.1906.tb05793.x.

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42

Bellezze, T., G. Roventi, and R. Fratesi. "Localised corrosion and cathodic protection of 17 4PH propeller shafts." Corrosion Engineering, Science and Technology 48, no. 5 (August 2013): 340–45. http://dx.doi.org/10.1179/1743278213y.0000000082.

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43

I., TAYMAZ, CAKIR K., GUNEY B., GUNDOGAR E., and CETINER I. "MODELLING OF LIGHT RANGE COMMERCIAL VEHICLE PROPELLER SHAFTS UNDER DYNAMİC EFFECTS." International Conference on Applied Mechanics and Mechanical Engineering 13, no. 13 (May 1, 2008): 1–11. http://dx.doi.org/10.21608/amme.2008.39643.

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44

Kychin, V. P., A. Yu Shul'te, and A. P. Olik. "Enhancement of corrosion fatigue strength of the material of propeller shafts." Materials Science 31, no. 3 (1996): 403–4. http://dx.doi.org/10.1007/bf00558567.

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45

Knoring, Semyon D., Victor V. Platonov, Nikolay G. Popov, and Valery M. Shaposhnikov. "Comparison of fatigue characteristics of 38ХН3МФА and 40ХН high-tensile-strength steels based on test results." Transactions of the Krylov State Research Centre 4, no. 394 (November 23, 2020): 63–69. http://dx.doi.org/10.24937/2542-2324-2020-4-394-63-69.

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Object and purpose of research. The object of work is steel “38ХН3МФА”, planned for use in the propeller shafts manufacture of the lead-ship (project 10510), and less strong steel “40XH”, used in the propeller shafts manufacture for icebreakers of lower ice categories and lower power. The purpose of the study is to compare the fatigue strength of these steel grades. Materials and methods. Investigations of the fatigue strength characteristics of steels were carried out by cyclic tests of flat notched specimens in air and cylindrical specimens in fresh water. Main results. It is shown that lowest fatigue strength results correspond to external cyclic loading of specimens with stress concentrator (notch). But even in these conditions, fatigue strength of 38ХН3МФА steel is better than that of 40XH steel. As for the tests of smooth samples in fresh water, 38ХН3МФА steel also has a clear advantage over 40XH steel. Conclusion. The studies have shown that fatigue strength characteristics of 38ХН3МФА steel in the air and in corrosive environment exceed those of 40XH steel. Environmental sensitivity and stress concentration of 38ХН3МФА steel turned out to be higher than for 40KH steel.

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46

Papageorgiou, Dimitris G., Kyriakos A. Kovsenoglou, Petros Bournelis, and Carmen Medrea. "Fracture analysis of a cooling water pump shaft." MATEC Web of Conferences 188 (2018): 04022. http://dx.doi.org/10.1051/matecconf/201818804022.

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Six shaft failures were encountered in a centrifugal water pump, part of the engine cooling system of a container ship. The last two failed pieces were received for analysis. A detailed study was carried out to determine the cause of the component failures. Historical data was collected, visual inspection was performed and a photographic file was created. The pieces were measured in order to record their general features and a 3-D model was generated. Hardness measurements were carried out. Microstructure was examined by means of light microscopy. A finite element simulation was conducted in order to determine the stress topology and to identify possible critical areas. Chemical analysis was carried out. The shafts were manufactured onboard, from AISI 304 stainless steel. The low hardness of both pieces indicates insufficient mechanical properties. Microstructural examination showed characteristic microstructure of coarse austenite. The presence annealing process derived twins and limited grain-boundary carbide precipitates were verified. The shafts failed due to torsional fatigue. Fracture initiated at the keyway on the propeller side as it was predicted from the finite elements analysis. Material selection material has and poor machining were found to be the main cause of failure. Appropriate recommendations were provided.

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47

Khalyavkin, Aleksey Aleksandrovich, Sergey Aleksandrovich Makeev, Dmitry Vladimirovich Loshadkin, Victor Andreevich Mamontov, Ali Salameh, and Anna Yakovlevna Auslender. "Analysis of influence of elastic properties of deadwood bearings on shaft line operability." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2021, no. 2 (May 31, 2021): 7–15. http://dx.doi.org/10.24143/2073-1574-2021-2-7-15.

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The paper considers the ship shafting and its design. Depending on the constructive features, operating conditions, effects of continuous, dynamic, variable and random loads the operation of the shaft line is accompanied by wear of the shafting structure and auxiliary parts. The formulas for calculating the maximum permissible clearances during operation in stern bearings of propeller shafts are given, according to the norms and technical and operational requirements. A graph of the maximum permissible clearances in metal stern bearings is presented. There has been carried out a dynamic design of the shaft line in order to define the influence of rigid characteristics of the stern bearings on eigen frequency of transverse vibrations. It is noted that the service life of the shaft line depends on the material of bushings or liners of the bearings (bakout, babbit, textolite, caprolon, bronze, polyurethanes, rubber) and their wear degree. The design scheme of the ship shaft line on elastic supports with a coefficient of rigidity is presented. To assess the influence of the elastic properties of deadwood bearings, the method of initial parameters was used. According to the researchers’ opinion, the greater the wear, the lower their stiffness coefficient. At a certain wear degree of deadwood bearings, there occurs resonance at the lowest operating frequencies. It has been proved that the greater the deflection at the attachment point of the propeller, the lower the eigen frequency of transverse vibrations of the shaft line. It has been pointed out that the calculations should include the separation of the shaft line from the deadwood bearing, since it contributes to a decrease in eigen frequency and causes a resonance during transverse vibrations.

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48

Korczewski, Zbigniew, and Konrad Marszałkowski. "Energy Analysis of Propulsion Shaft Fatigue Process in Rotating Mechanical System Part I Testing Significance of Influence of Shaft Material Fatigue Excitation Parameters." Polish Maritime Research 25, s1 (May 1, 2018): 211–17. http://dx.doi.org/10.2478/pomr-2018-0044.

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Abstract The article discusses the problem of mathematical modelling of energy conversion processes in a rotating mechanical system for the purpose of identifying fatigue states of propulsion shafts in this system. A simplified physical model of the analysed system, constructed in an appropriate scale, has made the basis for the experimental research. The research programme took into consideration mechanical fatigue excitation of the model propulsion shaft to find the correlation between the dynamic system load generated by a bending moment and the energy state of a specified shaft segment. A physical model of the analysed process was proposed, for which the plan of static randomised block experiment was worked out. The recorded experimental results were used for statistical analysis of the significance of influence of the quantities exciting the propeller shaft fatigue process and the adequacy of the developed mathematical model describing shaft’s durability. The analysis made use of the F-Snedecor test. The article describes the general concept of the research, the constructed laboratory test rig, and the methodology of statistical inference concerning the significance of influence of input (exciting) parameters of the physical model on the recorded output parameters. The results of the performed statistical tests confirm the absence of the significance of influence of the rotational speed of the propulsion shaft on the selected types of rotating operation of the mechanical system. As a consequence, only one exciting parameter, which is the loading mass, is going to be taken into account in the functional description of fatigue life of the propulsion shaft.

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Devletian, J. H., Y. P. Gao, Q. H. Zhao, and W. E. Wood. "Strip Cladding of Propeller Shafts with Nickel Alloy 625 by Electroslag Surfacing." Journal of Ship Production 9, no. 03 (August 1, 1993): 173–80. http://dx.doi.org/10.5957/jsp.1993.9.3.173.

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A comprehensive comparison between electroslag surfacing (ESS) and submerged arc surfacing (SAS) using 30-mm-wide (1.2 in.) χ 0.5-mm-thick (0.020 in.) nickel alloy 625 strip was conducted in both the as-deposited and stress relieved (at 650°C [1200°F]) conditions. In most cases, exactly duplicate cladding conditions were used to best compare ESS with SAS. Nickel alloy 625 strip was deposited on 10-cm-thick (4 in.) flat plates and 64-cm-diameter (25 in.) shafting (both MIL-S-23284 Class 1 steel) using optimized ESS and SAS processes. Tension and face and side bend tests were performed on as-welded and stress-relieved cladding at room temperature. Microstructural analyses of the clad specimens were performed using optical and electron microscopy. Cladding parameters were found to affect the dilution, deposition rate, and penetration. Although ESS and SAS cladding possessed similar strength levels, the cladding deposited by ESS was shown to have greater ductility than that by SAS. Also, the resistance to solidification cracking of cladding by ESS was superior to SAS because of the reduced silicon, carbon, oxygen, and impurity levels which promote interdendritic Laves phase, niobium-rich MC carbides and inclusions. Compared with SAS, the ESS method proved to be not only more metallurgically favorable but also cost-effective.

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50

Kume, Hiroshi. "Environmental Improvement by Reducing Damage of Propulsion Systems -Part 2 : Propeller Shafts." Journal of The Japan Institute of Marine Engineering 46, no. 1 (2011): 62–71. http://dx.doi.org/10.5988/jime.46.62.

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Journal articles on the topic 'PROPELLER SHAFTS'

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