De-risking the operation of critical equipment on Queen Elizabeth

Combining multi-channel monitoring and ODS modelling techniques


Critical equipment onboard the UK’s newest aircraft carrier, the Queen Elizabeth, was found to have a severe vibration issue. Excessive motion could easily be observed on the machine’s control panel, putting at risk electronic components within. A small component, but vital in the operation of the vessel, the risk of failure whilst at sea was unacceptable. Isolation had been specified but not yet installed with its suitability still to be validated


Deploying a series of accelerometers across the machine and control panel Xi undertook a series of measurements during various states of operation. This data was then fed into an Operational Deflection Shape (ODS) model of the machine. The ODS model was then used to visualise the behaviour of the machine at given states and frequencies, providing greater clarity of the systems dynamic behaviour. This allowed Xi to verify the effectiveness of the isolation.

Skill Set Used
Operational Deflection Shape Analysis (ODS)
Multi-sensor signal processing
Multi-variant statistical analysis
Component Design optimisation
Isolation specification
Xi's Role
Xi’s specialist engineering team were able to support
Rolls-Royce engineers providing critical information to
support the commissioning process.
Client Benefits
Detailed assessment and understanding of the machine dynamics
Allowed quantitative and informed decisions on the most appropriate remedial actions
Reduced risk of failure