Effect of Excitation Frequency on Transmissibility of Semi Isolated Structure

Abstract

Minimization of structural vibration is a technological challenge now-a-days. Vibration in structure and building leads to reduction in the comfort of occupant of building, causes disturbances in the sensitive equipment, leads to fittings and fixture damage, disturb structural integrity. And in some cases, it leads to severe consequence like collapse of buildings and structures. Vibration isolation is a commonly used technique for reducing or suppressing unwanted vibrations in structures and machines. The transmission of vibration can be mitigated by using different base isolation technique such as use of spring, elastomeric rubber bearing or by using different seismic dampers such as viscous damper, friction damper, yielding damper. The measurement and analysis of the structural vibration is essential to get the effective method of base isolation. In this experimental work, vibration analysis has been done on the structural model with different semi isolation base. The structural model has been made. Artificial vibration (with known frequency) has been imparted to the base of (structural) model. Vibration measurement has been done by using accelerometer and analyzer. Vibration measurement has been done at the base as well as on the structure. The effect of excitation frequency on transmissibility has been studied. In addition to these, the energy transmission ratio also has been studied.