Floor vibration isolation of a coriolis mass-flow meter using filtering techniques

In this research, floor vibration isolation using filtering techniques is evaluated. A Bronkhorst Coriolis Mass Flow Meter, CMFM, for low flows is used as a platform for testing the resistance against external disturbances. The robustification of this CMFM consists of both predicting the disturbance at the sensing frequency and removing as much of the other disturbances as possible. The first part, the prediction, starts with estimating the transfer from floor vibrations to mass- flow. Once this transfer is obtained, it is modeled using a state space model. The measured floor vibrations are fed to this model and subtracted from the measured mass-flow. The second part is the removal of the remaining disturbances (floor vibrations and higher harmonics) left. This is done using a band-pass and a Bessel filter. The band-pass filter enhances the measured data and improves the signal to noise ratio. A second order Bessel filter removes any high-frequent noise still present in the flow signal.