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Spin test rig : most important stage of tunnel thruster’s overhaul

Stępkowski M., Kończewicz W., Iwanicki L.

Journal of KONES

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2016

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Vol. 23, No. 3

505--510

EN

Tunnel thrusters during overhaul pass through several quality tests. After disassembly any clearance, shrink or subassembly are noticed. Measurements taken at verification stage determined which parts should be replaced. Definitely, the most important of tunnel thruster operation is bearings condition. Despite many years of experience, it is hard to find micro damages in the bearings without special devices. After assembly of tunnel thruster, the final stage is spin test. The spin test rig is equipped with bearings condition monitoring system including vibration, temperature and pressure inside the tunnel thruster live monitoring. During 4 hours of spin test, it is possible to check vibrations on the thruster and if any damage occurs it can be easily found, on which part of bearing appeared. Spin test rig gives possibility to check misalignments, gear condition, temperatures during 4 hours of operation and check oil quality (oil particle content acc. to ISO 4407 and water content). Spin test guarantees proper operation of tunnel thrusters after overhaul. If any damage appears during the spin test it can be easily eliminated. Without the spin test after overhaul, damage will be found after assembly on the vessel – on the sea trials. When damage is found too late, there is an additional cost for company to dock the vessel again and disassembly tunnel thruster for inspection. From economical point of view, the spin test rig gives possibility to avoid extra costs. Every passed spin test gives certificate of proper vibration level and proper assembly of thruster’s elements.

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Opportunities analysis of regeneration of plane front plate thruster on a universal lathe

Iwanicki L., Kyzioł L., Kielich K., Kozyra D.

Journal of KONES

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2015

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Vol. 22, No. 4

103--108

EN

The bow thrusters are devices, which make vessels manoeuvring much easier especially in the harbours or the straits with high intensity of the traffic vessels. The long-term exploitation of these devices causes damages, mainly for its propeller blades. The cavitation is the main cause of its damages. Technical condition of all thrusters components mainly taking into account blades are subjected to periodic inspection according to classification societies. In this article have been included examples of bad condition of the thruster blades caused by cavitation process or mechanical damages. These damages can be dangerous enough to turn off the device and make the vessel be out of exploitation. The thruster blades repairing are a very complicated and hazardous venture. The blades are large sized, unbalanced, heavy components and difficult to be mounted in lathes. The main aim of this work is to identify opportunities of thruster blades repair process. The article presents technological problems of blade regeneration with the lathe as a complicated solid, which causes very big problems with the setting axis the component. The thesis presents methods of attach propeller blades using the special handle and tusk lathes. Among others, research allowed defining operation rotating velocity, and other parameters related to mechanical regeneration. The researches have shown that presented method in practice allows for secure mechanical regeneration of blades thrusters.

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The prototype project of the position to designate the screw thruster lobe specific gravity

Kończewicz W., Stępkowski M., Skowroński M., Iwanicki L.

Journal of KONES

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2014

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Vol. 21, No. 3

165--170

EN

During the exploitation screw thruster, lobes are being defected in many ways. Sample types of damages are as follow: the material damages caused by cavitation, corrosion, deflection. In order to facilitate and to improve the quality of repairing activities, the idea of make the position to designate screw thruster lobes specific gravity has been initiated by Rolls-Royce Poland Company and Nautica Academic Circle. Incorrect lobes balance influences on irregular work of the screw, which results in the occurrence of adverse effects such as generation of vibration or increasing probability of mechanical elements damages during the exploitation. Screw thruster lobe specific gravity designation helps in identification of areas for treatment (welding, grinding) to achieve the desired parameters. The creation of designate screw thruster lobes specific gravity position gave the possibility of using the innovative scanning in 3D, which shows very clearly the picture of the scanning item. With Scanect and Autodesk Inventor 2014 software, we can manipulate the resulting image. This makes possibility of the lobes gabarits measurement. What is more, it designates the specific gravity exact to 10%.It increases the quality of the lobe renovation and these results in an improvement the screw thruster lobe’s work efficiency.The cooperation of The Maritime University in Gdynia and Rolls-Royce Poland Company resulted in creating the prototype, which will be tested by service technics in working circumstances.

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Spin test : the ability of spin test method usage in thrusters' fault detection and isolation

Iwanicki L., Kyzioł L., Kozyra D., Tarsa R.

Journal of KONES

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2014

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Vol. 21, No. 4

177--182

EN

In the article below, we presented the possibility of „spin test“ method usage for medium rotational speed devices such as thrusters', which are used to enhance the maneuverability of maritime vessels. The reason for the analysis is the problem of eliminating the unwanted vibrations of thruster's propeller with commonly used methods. It is an innovative solution for accurate verification of the technical condition of screw propellers, which are the most common devices used as the propelling element of thrusters. In the introduction the possibility of thruster's diagnosis using „spin test“ has been described. Commonly used thrusters' and their working conditions were presented. In order to properly assess the technical condition of rotational speed devices, such as thrusters' propellers after their production or renovation it is vital to provide an additional diagnosis in the environment similar to working conditions. Secondly, the problem of spinning parts' vibration was described. „Spin test“ method presented here gives the ability of detailed analysis of spinning parts' vibration. The idea of a compact and easy to assemble station enabling to conduct such research has been shown. The station not only allows to measure the eigenfrequency of vanes' in normal mode and compare it with the previously calculated ones, but also enables material's endurance testing at speeds higher than nominal speed. Finally, we presented the range of using this method in different fields along with the benefits of ‘Spin Tests’.