Low-vibration design of buildings for sensitive medical and scientific instruments

Some machinery and scientific instruments, for example electron microscopes and machines for high-precision fabrication found in the semi-conductor industry, are very sensitive to vibration.  They must be installed in environments where the vibration levels are extremely low.

Measuring floor vibration

Measuring floor vibration at the base
of a sensitive analysis machine

There are no national or international standards which apply, but a number of Vibration Criteria (VC) curves have been defined for acceptable levels in different environments. These range from operating theatres, where magnifying devices used in micro-surgery also magnify vibration levels, all the way down to silicon fabrication, which requires levels which are four orders of magnitude lower than the lowest levels perceptible to humans. 

Extremely low levels of vibration need to be measured, and ISVR Consulting has the specialist equipment and capability to make such measurements.

Measuring floor vibration

Finite element model of a building designed to house vibration-sensitive instrumentation

As well as measuring extremely low vibration, ISVR Consulting can offer Finite Element (FE) modelling to predict the vibration levels in such sensitive environments and assess the effect of equipment such as generators, cooling towers, chillers, combined heat and power units (CHPs), compressors operating in the vicinity, and nearby road and rail traffic.

The vibration responses of a biulding are predicted by building an outline Finite Element (FE) model to simulate the building.  The model is then used to predict the vibration levels on different floors from the known vibration inputs or sources. In this way, compliance of mechanical services equipment operating close to sensitive scientific instrumentation can be predicted during the design stage before the construction of the building.