Temporal Changes of the Vibrations of the A/2 Building of the University of Miskolc Measured by LDV Method

Abstract

The very weak transversal vibrations (less than 1µm amplitude) of the A/2 university building were measured by an LDV (Laser Doppler Vibrometer) interferometer. The measurements were made on an indoor wall of our laser laboratory, and the device was on an anti-vibration table. The temporal measurements are necessary to compare the measurements made at different points of the building at different dates. We found that the vibrations are in close connection with the human activity inside the building, they are more potent at workdays than at the weekend and stronger at working hours than beyond. The one-hour frequency spectra are relatively stable between 9 16 hours on workdays, mainly below 5 Hz.