twicer ® 05-Ноя-2021 13:20

Calculation methods for Shaft Alignment


Year: 2021
Language: english
Author: DNV
Genre: Class Guideline
Format: PDF
Quality: eBook
Pages count: 25
Description: DNV class guidelines contain methods, technical requirements, principles and acceptance criteria
related to classed objects as referred to from the rules.
The propulsion line aftmost bearing life can be extended and maintenance cost reduced by using more
comprehensive shaft alignment calculation methods for the load on the bearing. This guideline is a
supporting document for the DNV Shaft align(2) class notation.
The objective of the computational fluid dynamic (CFD) calculation is to estimate and assess the maximum
shaft forces and moments induced by hydrodynamic propeller loads which shall be used as input to the shaft
alignment analysis at design and off-design conditions.
The class guideline provide details of methods used to carry out viscous CFD calculations to predict the
hydrodynamic propeller loads and finite element analysis (FEA) to estimate the propeller shaft aft bearing
contact pressure. In addition, an alternative for aft bearing lubrication criteria for exceptional aft bearing
designs and logic for laser based measurement are provided.
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