Appplication of the optimization methods for the search of marine propulsion shafting global equilibrium in running condition

Appplication of the optimization methods for the search of marine propulsion shafting global equilibrium in running condition

  APPLICATION OF THE OPTIMIZATION METHODS FOR THE SEARCH OF MARINE PROPULSION SHAFTING GLOBAL EQUILIBRIUM IN RUNNING CONDITION Full film hydrodynamic lubrication of marine propulsion shafting journal bearings in running condition is discussed. Considerable computational difficulties in non-linear determining the quasi-static equilibrium of the shafting are highlighted. The approach using two optimization methods (the particle …

Interactive shaft alignment as a means for uncertainties overcome

  Dr.Yuriy Batrak, November 2019, Intellectual Maritime Technologies INTERACTIVE SHAFT ALIGNMENT AS A MEANS FOR UNCERTAINTIES OVERCOME The Swedish Club statistics published in the third Main Engine Damage report (2018) show that the number of failures associated with ship propulsion does not decrease but even slightly increases. Undoubtedly various types of shaft alignment errors make …

Bearing influence coefficients long sentry duty

  Dr. Yuriy Batrak, October 2019,  Intellectual Maritime Technologies, Ukraine Otto von Bismarck told the story after his visit to Saint Petersburg, Russia in 1859. “During the first spring days, it was then the custom for everyone connected with the court to promenade in the Summer Garden between Paul’s Palace and the Neva. There the …

Shaft alignment with ShaftDesigner: Waterjets

Shaft alignment with ShaftDesigner: Waterjets

  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 …

Tolerance aspect of rational shaft alignment design

Tolerance aspect of rational shaft alignment design

  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 …

Shaft Alignment In A Dry Dock

Shaft Alignment In A Dry Dock

  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, …

New CAE package for propulsion train calculations

New CAE package for propulsion train calculations

  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 …

Ice Induced Propulsion Shafting Torsional Vibration Analysis Issues and Case Studies

Ice Induced Propulsion Shafting Torsional Vibration Analysis Issues and Case Studies

  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 …