Abstract:
When buildings are exposed to vibration or shock,
those buildings can be damaged partially or fully depending on
the vibration energy. Therefore, quantitative analysis of
building vibration has become popular among researchers. In
this research, vibration sensor was developed using piezoelectric
ceramic cantilever beam and tip mass to confirm the vibration
frequency of the building does not exceed the cosmetic damage
range.
As the first step, mathematical model was derived to
calculate the resonance frequency of cantilever beam with a tip
mass. At the resonance frequency, maximum amplitude could
be achieved resulting a higher output voltage of piezoelectric
sensor. The derived mathematical model and finite element
analysis were used to determine the accurate dimensions of the
cantilever beam based piezoelectric sensor. 31 coupling mode
was used to measure the voltage difference in piezoelectric
material. Faster Fourier Transformation function was used to
analyze the signal. Output voltage of piezoelectric sensor was
calculated using finite element analysis at vibration frequency
range that corresponds to cosmetic damage. According to the
calculations, threshold voltage level and frequency of sensor are
4.35mv and 9.5Hz respectively to activate the alarm.
Finally, by using a vibration source, comparatively high
accuracy of 92% voltage value was obtained from the proyotype
device compare to the software modelling. The developed sensor
module is capable of indicating harmful vibrations on building
structures.
