Nauticus Machinery Knowledge Centre Help library Tools and Calculations Shaft Alignment Tool
Module Description
The Nauticus Shaft Alignment tool provides advanced analysis for shaft alignment, whirling vibration and axial vibration in marine propulsion systems. It ensures optimal alignment and vibration control to enhance reliability and meet classification society requirements.
The tool covers two modules:
- Shaft Alignment Analysis – Performs essential alignment calculations, including basic alignment analysis, verification, and lubrication assessment for the after stern tube bearing.
- Whirling & Axial Vibration Analysis – Conducts whirling and axial free vibration calculation based on the same fundamental shaft alignment model.
This chapter focuses the Shaft Alignment Analysis module.
Key Features
- Efficient modelling by drag and drop, scripting function or Excel templates.
- Define operating conditions and condition-dependent properties.
- Basic alignment calculation and output shaft deflections, bending moments/stress, bearing loads and so on.
- Open shaft calculation to output gap and sag results.
- Jack-up calculation to measure the bearing loads.
- Lubrication criteria calculation to ensure the hydrodynamic lubrication on after stern tube bearing.
- Oil film analysis calculation for after stern tube bearing.
- Bearing offset verification considering hull deflections and thermal expansions.
- Shaft Alignment calculation considering the magnetic pull forces from integral shaft generator system.
- Optimization calculation to obtain bearing offsets meets the constraints.
- Comprehensive reporting function.
Workflow
- Model shaft components and bearings.
- Define operating conditions and condition-dependent properties.
- Calculate alignment and bearing reactions.
- Verification calculations: gap sag and jacking.
- Calculate lubrication criteria for white metal after stern tube.
- Include tolerances in calculations for realistic alignment assessments.
- Rule compliance and manufacturer requirements verification.
- Optimize bearing offsets and after stern tube design by iterating step 3 to 7.
- Generate compliance reports.