Calculation, mode of proceeding
The way the anti-vibration technology suspension should be designed will differ depending on the task to be completed.
The same natural frequency should always be attained at all mounting points of a mounted mass. It is only in this case that the calculated natural frequency is also the frequency of the system in a vertical direction. Otherwise the natural frequencies of the spring-mass system are interlinked, in which case the simplifications made here monovariantly for an oscillator are no longer correct.
The natural frequencies are derived from the mass at the mounting point and the spring stiffness of the MEGI mount used there.
The simplest method is to achieve identical natural frequencies when the bearing points are distributed such that each one is exposed to the same weight force. Then the same elements can be used on all bearing points.
If this is not possible the MEGI mounts shall have to be selected in such a way that the distribution of mass to the various mounting points yields the same natural frequency. MEGI Railstrips are just right in this case because they can be cut to lengths that provide the requisite spring stiffness.
Vibration isolation (active or passive)
No matter whether the environment is isolated from vibrations (active vibration isolation) or whether a sensitive instrument should be protected against influential vibrations from the environment (passive vibration isolation), the mass to be isolated (or the weight forces on the individual bearing points) and the natural frequency are required for calculation.
A degree of isolation, conforming to the requirements, is specified. It is the basis for the calculation of the requisite natural frequency. The degree of isolation is attained when the system is tuned to this natural frequency. At higher frequencies the degree of isolation drops, at lower frequencies it rises.
The calculated natural frequency and known load on each bearing point can be used to determine the required spring stiffness, and therefore the static springing as well. Then, the appropriate MEGI elements can be selected from the catalog. Finally, another calculation is completed to ensure the correct item was selected.
The calculation tool integrated into the online catalog completes these calculations to support product selection in an interactive process.