Marine engines come with preinstalled anti vibration mounts.
Although it may vary according to the application, the service life of a marine anti vibration mount is close to 4 years with full functionality.
Once this period is overpassed, additional noise or vibration may be noticed. This is a sign that marine vibration isolators must be replaced.
On this article, we will indicate some hints to select a correct marine vibration isolator:
- Load and centre of gravity of the marine engine. This parameter is key. An overload marine anti vibration mounting will not provide optimal stiffness and will show premature ageing.
The marine anti vibration mounts work optimally when they are loaded at their 60% of load capacity. This way the vibration isolators offer correct stiffness properties and are capable of accepting additional dynamic loads without premature deterioration.
- How to calculate the load per mount?
Calculating the load per mount is an easy operation. For this purpose we need to know several parameters, such as:
- Total load
- Position of centre of gravity
- Position of the anti vibration mounts
The formula is:
Manufacturers of anti vibration mountings such as AMC-MECANOCAUCHO, can make anti vibration calculations on a free of cost basis. For this purpose, a questionnaire must be fulfilled.
The vibration calculation provides a mathematical report where isolation % is described by frequency of the engine, as well as extreme deflection ratio, natural frequency, ...
Link for downloading this questionnaire:
Questionnaire
There are many types of marine anti vibration mounts in the market. On the following lines, we will describe what are the important features that a correct marine mount should have:
- Fail safe device
- Low natural frequency
- Marine certification
- Capability of accepting forces
- Double bonded
- Safe height adjusting systems
- Correct corrosive protection
- High mechanical protected elastomeric compounds
The following mounts can accommodate to the previously stated features:
The selection of the marine mount is an important question that must be done correctly. We recommend to contact professionals that are used to deal with these matters.
If you have a problem and you want to have an additional information or point of view on your particular case, contact us and our team of application engineers will provide a free of cost service of technical assistance.
United Kingdom
