Do not forget about shafting bending in the horizontal plane

Do not forget about shafting bending in the horizontal plane

  DON’T FORGET ABOUT SHAFTING BENDING IN THE HORIZONTAL PLANE Dr.Yuriy Batrak, July 2020, Intellectual Maritime Technologies While aligning the ship propulsion shaftings, the focus, as a rule, is on the shaft alignment in the vertical plane. This subject is well discussed, but shaft alignment in the horizontal plane usually stays out of sight. Even …

Snow Dragon’s bearing failure investigation: the case study

Snow Dragon’s bearing failure investigation: the case study

  SNOW DRAGON’S BEARING FAILURE INVESTIGATION: THE CASE STUDY At 2018 we got a request to investigate the cause of the intermediate bearing failure (wiping of the bearing bush accompanied by a significant temperature increase) that happened at the Chinese icebreaking research vessel Snow Dragon (雪龙, Xue Long in Chinese) on her way home after …

Double bottom deflections during vessel docking

Double bottom deflections during vessel docking

  DOUBLE BOTTOM DEFLECTIONS DURING VESSEL DOCKING Dr.Yuriy Batrak, Alexander Ursolov, March 2020, Intellectual Maritime Technologies The measurements on the propulsion shafting of the one-screw vessel with the main dimensions L =  200 m, B=30 m, d=8 m, D=40000 tons were performed last month. For measurements, strain gauges technique and jack-up test method were applied. For determining …

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 …