VIBRATION ISOLATION PRODUCTS High performance anti-vibration platforms and workstations


Creating the best environment for your laboratory Overview


Theory


Vibrations limit the performance of sensitive instruments in numerous applications. Thus the need to remove vibrations to optimize performance has become crucial. We have spent many years developing state-of- the-art workstations and platforms, which provide the user with a truly vibration free surface on which the user can place equipment. Our products are available in a wide range of sizes and shapes to support instruments of varying weights and footprints.


Features


n Choice of elastomeric or air isolators according to instrument requirements


n Active air self leveling and passive pump up versions


n Highly rigid laminated construction with damping core


n Low cost, easy to install and free from maintenance


n Ideal for laboratories and clean rooms, will meet Class 10 (Class 1 available)


n Simple, compact, easy to use and clean


n Wide range of sizes, options and accessories


1 10


Elimination of movements from a working surface is achieved by isolating it from any external influences such as the floor and the structure itself. Worktop construction must be rigid to damp out any induced surface movements (fans etc.). The major sources of external disturbances are vertical and horizontal floor movements.


Floor vibrations arise from many sources; road traffic, trains, large machinery, lifts and building sway are among common examples. Typically building vibrations peak in the region of 7 Hz, however a metal frame building of height H has a resonance of roughly 46/H hertz, which means that on the fifth floor of a building you can expect horizontal and vertical displacements as low as 3 hertz. Floors almost never exhibit periodic vibrations in the 1 to 3Hz band.


The measure of the effectiveness of an isolation system is given by its transmissibility (below). As an approximate rule isolators start to become effective at between two to three times their own natural resonant frequency. Thus to remove vibrations at 7Hz an isolator with a natural frequency of about 2Hz is required.


The performance of an isolator depends on its stiffness and the mass it is supporting. In general isolator performance improves as mass is increased and for optimum performance one should work close to the maximum load an isolation system is designed to support. As an example, it is bad practice to place a 50kg load on a table designed to support 500kg, whereas a load of 200kg or more would be suitable.


Materials Tester Confocal Laser Microscope Analytical Balance


10-1 Laboratory Microscope on Contoured Platform 10-2 Semiconductor Bond Tester


10-3 0.1 1 10 Frequency (Hz) 100


2


Transmissibility of Platform


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