Waterjets are becoming more and more popular as a propulsor at ships. ShaftDesigner software allows calculating alignment of waterjet shafting as well as whirling, torsional and axial vibrations. Waterjet has a specific shafting configuration and corresponding alignment procedure. This article illustrates waterjet alignment calculation performed by the IMT company in September 2019. The project …
DOUBLE BOTTOM DEFLECTIONS INDUCED BY SOLAR HEAT IN THE DRY DOCK AND AFLOAT Dr.Yuriy Batrak, Mykola Lavrov All shaft alignment guides contain the requirement to undertake shaft alignment early in the morning or when it is cloudy. This requirement is introduced to avoid the significant effect of solar heat on shafting or engine alignment. …
Dr.Yuriy Batrak, June 2019 TOLERANCE ASPECT OF RATIONAL SHAFT ALIGNMENT DESIGN Failures of the propulsion installations occur with enviable constancy. According to The Swedish Club information among 1221 machinery claims, occurred between 2012 and 2017, 277 claims (22,7%) are associated with propulsion, not including main engine failures. The experts believe that the reason …
Dr. Yuriy Batrak, May 2019 SHAFT ALIGNMENT IN A DRY DOCK Recently our company IMT was asked to deal with the problem of rapid wear of the intermediate shaft line bearings. Many assumptions were considered regarding the possible causes of failures. According to the presented shaft alignment calculation, there should be no problems. Moreover, …
Y. Batrak, R. Batrak and D. Berin, Intellectual Maritime Technologies, Ukraine SUMMARY Computer applications for engineering design usually aim to solve certain classes of problems. As a rule it is implicitly assumed that the initial data for such calculations are well defined and unambiguous. However, in those cases where there is a set of …
Y. A. Batrak, Intellectual Maritime Technologies, Ukraine SUMMARY There are three main problems for engineers specializing in propulsion train calculations, which include shaft alignment, whirling vibration, bending vibration, axial and torsional vibration calculations. The first problem is a lack of a single shaft model to perform all types of shaft related calculations. Oftentimes separate …
Yuriy Batrak Intellectual Maritime Technologies, 19-g/12 Krylova str., Mykolaiv 54038, Ukraine yuriy.batrak@marine-software.com Abstract Since analysis of shafting transient torsional vibrations caused by ice impacts became mandatory, numerous modelling-based calculations have been carried out for ships sailing under ice class. However, the calculation results still do not allow to obtain general conclusions from the shafting response …
Yuriy A. Batrak PhD, Intellectual Maritime Technology Martin van Leest, Machine Support B.V. ABSTRACT There are three main problems for engineers specializing in propulsion train calculation. The first problem is a lack of a single shaft model to perform all types of shaft related calculations, the second is the inability to analyze different operation …
Yu. Batrak, R. Batrak, D. Berin, Intellectual Maritime Technologies, UKRAINE SUMMARY The propulsion shafting operates at the junction of different media where the interacting conditions change constantly depending on the ship draught, engine speed, ambient and machinery temperature. Once installed on the flexible hull structures it is exposed to hydrodynamic propeller loads, variable contact …
Yuriy A. Batrak*1, Anatoliy M. Serdjuchenko2 and Alexander I. Tarasenko2 1 Intellectual Maritime Technologies, 19-g/12 Krylova str., Mykolayiv 54038, Ukraine 2National University of Shipbuilding 9, Geroyiv Stalingrada av. Mykolayiv 54025, Ukraine yuriy.batrak@gmail.com (e-mail address of lead author) Abstract Polar ships and other ice-class ships intended for navigation in ice-infested waters suffer from the transient …