REVERSE ANALYSIS OF THE SINGLE STERN TUBE BEARING PROPULSION SHAFTING ALIGNMENT Dr. Yuriy Batrak, Roman Batrak Intellectual Maritime Technologies August 2023 The ship repair industry demands reliable and easy procedures to verify shaft alignment of the ship propulsion shafting. These days this problem frequently arises due to the replacement of the propellers, the stern tube …
Anatoliy Serdjuchenko, Aleksandr Ursolov, Yuriy Batrak Intellectual Maritime Technologies, Buznika 5, room 15, Mykolaiv, Ukraine 54010 Corresponding author. E-mail address: aleksandr.ursolov@shaftdesigner.software (Ursolov A.) Abstract An analytical approach based on the asymptotic technique is applied to estimate hydrodynamic pressure in lubrication film of water-lubricated stave bearings with length/diameter ratio L/D>1. Circular staves and flat staves with …
RAPID METHOD FOR ACCURATE DETERMINING PROPELLER VOLUMETRIC AND INERTIA PROPERTIES Ursolov Oleksandr Ihorovich, Ph.D., Filin Dmytro Sergeevich, M.Sc. Abstract. The calculation tool for rapid and accurate determining the propeller mass, centroid coordinates, and inertia moments was developed. The approximate formulas for the propeller’s diametrical inertia moment and partially submerged volume have been proposed. The …
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 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 …
THE IMPORTANCE OF CORRECT SHAFT ALIGNMENT DESIGN FOR BEARING BUSH DURABILITY Dr.Yuriy Batrak, May 2020, Intellectual Maritime Technologies Having a good bush material does not guarantee long and happy life of a bearing. A vivid example is the case of wear of the bracket bearing bush made of the proven Thordon Compac material. Our …
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 …
HOW TO ESTIMATE BEARINGS’ DISPLACEMENTS DUE TO HULL DEFLECTIONS Dr.Yuriy Batrak, January 2020, Intellectual Maritime Technologies It is far better to foresee even without certainty than not to foresee at all. Henry Poincare Whenever I tell naval architects about the nature of shaft alignment, and how accurately it should be performed, they are surprised, …
APPLICATION OF THE OPTIMIZATION METHODS FOR THE SEARCH OF MARINE PROPULSION SHAFTING GLOBAL EQUILIBRIUM IN RUNNING CONDITION Aleksandr Ursolov, Yuriy Batrak, Wieslaw Tarelko 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 …
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 …