Active and Passive Isolation

Active or direct isolation  means the direct ab- sorption of oscillations, vibrations and shocks of a running machine by anti-vibration mounts, i. e. to prevent directly the transfer of the numerous machine vibrations into the sub- structure, basis frame and entire building. For the anti-vibra- tion mount selection the knowledge of the interfering fre- quency (disturbance frequency), the stiffness of the machine structure and its gravity center as well as of the specific machine location in the building is required. Active isolations are usually overcritical machine installations on anti-vibration mounts (e. g. on ROSTA ESL mounts).

Passive or protective isolation  means to in- stall a protective barrier between all kind of existing vibra- tions and shocks occurring in a factory or workshop towards sensitive installations like e. g. weighing and measuring in- struments, laboratory equipment or electronic control units. The vibration technological situations usually vary in each case and are related to environmental situations, too. Often shocks and impacts come from outside, e. g. from motor- ways, railways, building sites or tooling machines, like punching presses, etc. Generally, the sensitive equipments shall be protected by installing them on rather “soft” anti-vi- bration mounts, e. g. ROSTA ESL or AB-D mounts absorbing most of these environmental impacts. It is frequently recom- mendable to consult also an engineering company having the tools and instruments to analyse the specific vibration appearances.


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