Noise and vibration,
our business your comfort on board
With more than 50 years of experience, Intersona BV is the noise and vibration consultancy firm for ships worldwide. Drawing on decades of knowledge and extensive experience, our consultants provide shipyards and shipowners with practical solutions to minimize noise and vibration issues. As independent experts, we base our recommendations for noise and vibration reducing measures on physical principles and technical properties of materials. Intersona is certified by Bureau Veritas to carry out noise and vibration measurements related to the COMF additional class notation (COMF NOISE and COMF VIB).
Design and engineering phase
At Intersona, we proudly support a broad spectrum of maritime projects, working on all types of vessels from the initial design phase through to active
operation. During the design phase, our experts provide calculations, advice, and drawings related to noise and vibration.
Evaluate noise and vibration sources
Our experts can assess all
relevant noise and vibration
sources, including machinery
mounting. We provide
recommendations to minimise
noise and vibration at the source,
resulting in improved comfort
throughout the entire vessel.
Noise level prediction
Natural frequency calculations
Our experts can calculate
natural frequencies using
analytical models and/or FEM
(modal analysis). Based on the
predicted natural frequency and
excitation frequencies of vibration
sources, effective measures can be
recommended to prevent
resonance.
Design and assess insulation & floor plans
Construction phase
During the construction phase, Intersona’s experts review designs and calculations of suppliers, conduct visual inspections, and perform natural
frequency measurements.
Assessment of designs and calculations of suppliers
Visual inspections
Natural frequency measurements
Commissioning & operation phase
During the commissioning phase, Intersona conducts measurements during sea trials to verify whether the ship meets the previously agreed-upon requirements. These measurements, including analysis and reporting, are carried out following the IMO and ISO requirements. In addition, if damage occurs that may be related to vibrations, Intersona’s experts can carry out measurements to help troubleshoot the issue. These troubleshooting measurements aim to identify the root cause of vibration-related damage by providing insight into the dynamic properties of the relevant systems.
Noise measurements
Noise measurements can be
performed by Intersona using a calibrated Class 1 sound level meter, including noise spectra analysis with one-third octave bands and fast Fourier transform.
Vibration measurements
Our experts can perform vibration measurements using calibrated sensors and an analyzer, including recording
waveform and vibration spectra analysis (one-third octave bands and fast Fourier transform). We assess vibration levels related to (dis)comfort, and potential damage risks, aiming for
long-term machinery operation.
Shaft power measurements
Intersona experts can perform power measurements on shafts using strain gauges and shaft speed measurements. For propeller shafts, propeller curves can be determined. These measurement results can be used to assess ship speed and for EEDI calculations.
Other measurements
- Torsional vibration measurements (strain gauge, laser)
- Bollard pull measurements (load cell)
- Whirling measurements (proximity transducer, laser)
- Dynamic displacement measurements (laser)
- Dynamic pressure measurements
- Multi-channel measurements
