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Vibration Surveys What is a Vibration Isolation Survey?


KSI engineers are experienced in the latest vibration isolation survey and measurement technologies, and data analysis methods.  Using advanced data acquisition systems, high sensitivity accelerometers, and laptop computers, they can accurately measure and analyze data specific to your location.  Data is collected for vertical and horizontal vibrations over the required frequency range (typically between 0.5 and 500 Hz) and averaged over time to reflect normal working condition vibration levels at your location. This real time data is converted into frequency spectrum for further analysis and compared with your equipment’s allowable vibration levels as obtained from the equipment’s manufacturer.  FFT analysis and real time integration of data provide amplitude and velocity spectrum of the vibration conditions. This data is then converted, plotted onto graphs (log scale narrow bandwidth spectrum, modified to octave or third octave bands) and supplied in a complete report detailing specific recommendations as to whether vibration control is necessary, if so what degree, and how to best provide efficient, cost-effective solution.




High precision and sensitive equipment like aligners, steppers, microscopes, photolith, interferometers etc used in semiconductor industry, bio-medical research, laser research, usually have a low tolerance to vibrations at the installation location. In order to ensure the operation of these equipment to their maximum capability and precision, the vibration levels at the installation locations must not exceed the specified ‘maximum allowable vibration levels’. The manufacturers of these equipments usually recommend a pre-installation vibration survey of the location to ascertain the floor vibration levels and determine whether the operating conditions are of a sufficiently low level to permit rated equipment performance. This also helps in finding the best location for the installation within a given area/room.

These building vibrations are usually generated by nearby operating heavy machinery, human, building structural configuration (old buildings), vehicle movement, proximity to heavy traffic areas etc.
If the vibration levels are found to be severe or exceed allowable levels, the survey data will help in identifying possible vibration source and determine appropriate solution to reduce the vibration like providing vibration isolation, structural modifications etc. The survey also helps deciding the level of isolation needed to reduce the vibration to acceptable levels.

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