Transmission Loss and Damping Loss Factor Testing

In our test facility we are able to not only test materials for their Damping Loss Factor (DLF) but also the Sound Transmission Loss (TL) of a partition. Transmission Loss will determine the amount of air-borne noise a certain partition will “block”.

We will use a mixture of sound pressure and the technique of sound intensity readings. By using this method, influence of the receiver room geometry, absorption and how the sample is clamped in its’ position will be minimised.

Although we will not be a certified ISO/NEN test laboratory, we will measure and facilitate as close as possible to the known ISO standards (i.e. 140-3, 717-1). The measurements will be as accurate as with any measurement standard but we will be more flexible and can offer our test service at very competitive rates.

The Damping Loss Factor is the ‘power’ of a material to convert part of the acoustic energy into heat instead of transferring it or radiate as airborne noise.

The space where the modal damping is measured (as the base for the damping loss factor) has got less stringent requirements then the one used for the sound reduction tests. Registration of temperature, enough flexibility of the supports where the sample is connected to and a good solid supporting construction for the flexible hangers is important. Both tests will allow our clients to do more “what if”, improvement studies or product development.


Other services


Vibration analysis

In order to meet vibration targets it is essential to study the vessel’s structural behaviour.


Insulation treatments

Sound insulation is divided into structural insulation (bulkheads, sides and overheads) and joinery insulation (floors and partitions).


Noise level predictions

Noise levels are calculated to verify the contractual noise values considering the sound sources and insulation treatments.


On-site inspections

Van Cappellen Consultancy not only inspects the installation of insulation treatments, but also validates the installation of machinery equipment, connections and support by performing intermediate measurements such as mobility measurements.


Noise and vibration measurements

There are numerous measurement objectives, including checking whether noise and vibration levels comply with the contract specification, pre and post refit comparisons or survey troubleshooting.


Other services

In addition to our standard services, we also assist shipyards and owners with various other noise and vibration related issues.