Nauticus Machinery Knowledge Centre Help library Tools and Calculations Torsional Vibration Tool
Module Description
The Nauticus Torsional Vibration (TVC) tool provides comprehensive analysis capabilities for propulsion system torsional vibrations. This module helps engineers predict and mitigate harmful vibrations that could damage rotational components or shafting elements.
The tool covers two modules:
- Steady state (frequency domain) calculation module – Analyzes torsional vibration responses in frequency domain by computing free vibration and forced vibrations due to steady state excitation sources.
- Transient (time domain) calculation module – Calculate the dynamic response of torsional systems in time domain due to transient excitation such as ice impacts or electrical short circuits.
Both frequency domain calculation and time domain calculation are based on the same mass-elastic model. This chapter focuses the frequency domain calculation module.
Key Features
- One mass-elastic model supports various operating modes and load cases.
- Calculates free and forced vibrations for all types of marine propulsion plants.
- Integrate three methods (Harmonic, Theoretical and Empirical) to calculate the diesel engine gas excitation.
- Integrate various propeller damping models.
- Support dual-fuel engine in different excitation mode (Diesel mode and Gas mode).
- Efficiently identify the worst misfiring cylinder for the diesel engine propulsion system.
- Find recommended barred speed range for diesel engine system.
- Support custom load curve to handle the case like CPP system working at combinatory propeller curve.
- Handles ice impact on propeller by steady-state approach according to ice class rules.
- Compliance verification according to rule requirements and manufactor specifications.
- Advanced report and print features, integration with MS Office applications.
Workflow
- Model mass-elastic system with mass, stiffness, and damping properties.
- Define operating modes and load cases.
- Define excitation sources, including engine excitation and propeller excitation.
- Perform calculations, including both free vibration and forced vibration analysis.
- Evaluate forced vibration responses against allowable limits.
- Determine and introduce barred speed range if applicable.
- Generate compliance report.