Rubber Mounts (Elastomer Mounts)
Rubber Mounts or Elastomer Mounts are available in various shapes and sizes, a range of rubber hardness, etc. The Sebert Rubber Mounts have been specially developed for optimal isolation of sound transmission, vibrations and shocks for the high-end market. A variety of TNO tests have proven the excellent performance of the Sebert Rubber Mounts. These Rubber Mounts have important advantages over Yielding straps, Leaf Spring Mounts and Wire Rope Mounts when it comes to sound transmission.
Why Sebert Rubber Mounts
The Sebert Rubber Mounts are mainly made of natural rubber, which has a high fatigue resistance, shows little permanent deformation and is reasonably temperature resistant.
By making use of the correct suspension set up with Rubber Mounts, the construction noise level is reduced by 10 to 20dB. As a result, the airborne noise level in low frequency (approx. 100Hz) is 10dB lower, for high frequency (approx. 500Hz or more) 25-40dB lower or even more depending on the construction.
The rubber can be loaded in all directions (pressure, tensile and shear loads). Normally, the tensile load for "standard" rubber mounts should be avoided, but by using the N type Sebert Rubber Mounts they can be loaded up to 70mm.
By placing a protective metal cap on the top, the rubber is protected against external influences such as mineral oils as these could penetrate the natural rubber.
- Acoustic properties are fantastic, as proven in various TNO tests.
- Our Rubber Mounts can be loaded in all directions (pressure, tensile and sliding loads).
- The ambient temperature can range from -30 ºC to +70ºC.
- Natural rubber is resistant to inorganic acids, bases and salts except for concentrated nitric acid.
- A natural frequency up to 2.5Hz with a travel of 70mm is feasible.
- Static load from 5kg to several tons
- The high energy absorption ensures low loads on machines and foundations. The Rubber Mounts can be confined with captives. This means that in the event of a rupture, the device does not catapult through the room.
The Rubber Mounts can be mounted in all directions. Make sure that the Rubber Mounts are placed symmetrically in relation to the center of gravity. When the Rubber Mounts are mounted under the unit and the center of gravity is relatively high, there is a possibility of lateral results. Additional stabilization on the (top) side may be necessary.
The main advantage of mounting the Rubber Mounts under the unit at an angle of 45 degrees is that the shock and vibration behavior is optimized both horizontally and vertically. Please consider that with a tensile load (below 45 degrees) the force road diagram becomes more progressive.
A customer of Sebert Trillingstechniek produces chillers for the Royal Netherlands Navy. There were shock requirements of 260g acceleration with a pseudo-speed of 5.2 m/s and a displacement of 45mm (under the springs). A shock and vibration calculation was carried out to ensure that the chiller still met the very strict marine requirements. The calculation showed that a shock recovery of 9g with a duration of 13ms was possible when a type N Rubber Mount was chosen.
The Test lab performed a drop test of 87mm to prove the calculated shock values. During the drop test the chiller was functional, after the fall test the chiller was still functional and an acceleration of 9g with a duration of 15ms was measured. Therefor the chiller meets the "extreme" requirements of the Royal Netherlands Navy.