Vibration Control involves the correct use of a resilient mounting or material in order to provide a degree of isolation between a machine and its supporting structure. A condition should be achieved where the amount of vibration transmitted from or to the machine is at an acceptable level.
To achieve efficient vibration isolation it is necessary to use a resilient support with sufficient elasticity so that the natural frequency (fn) of the isolated machine is substantially lower that the disturbing frequency (fe) of vibration. The ratio fe/fn should be greater than 1.4 and ideally greater than 2 to 3 in order to achieve a significant level of vibration isolation.
Damping provides energy dissipation in a vibrating system. It is essential to control the potential high levels of transient vibration and shock, particularly if the system is excited at, or near, to its resonant frequency.
Active Shock and Vibration Isolation
A foundation block for a dynamic machine should be isolated in order to reduce the effects of vibration and shock on nearby machines, people and the building structure. Controlling the source of a structural disturbance is known as active isolation.
Applications include isolation of foundations for:
- Power Presses
- Drop Hammers
- Forging Machines
- Metal forming and Cutting Machines
- Engines and Test Rigs
- Printing Machines
- Rolling Roads
Passive Shock and Vibration Isolation
When it is not possible to prevent or sufficiently lower the transmission of shock and vibration from the source, a resiliently supported foundation block can be used for the passive isolation of sensitive equipment.
Applications include isolated foundations for:
- Machining Centres
- Grinding Machines
- Measuring and Inspection Equipment
- Laser Cutters