ABSTRACT
This paper reports the result of experimental verification on performance and accuracy of structural identification using Variable Pendulum Sensor (VPS). A 2-DOF shear model was used as structural model. A prototype of VPS, which can change the swinging cycle of the pendulum by changing springs, was installed on the first or second story of the structural model. Forced vibration test was carried out, and responses of both the structure and the VPS were measured before and after changing the springs of the VPS. As the physical dynamical parameters, the mass, the shear stiffness, and the damping coefficient of each story of the model are directly identified from the observed response data, by prediction error method and using reduplicated state-space model derived from the equations of motion before and after the shifting of the swinging cycle of the pendulum. Result of the experiment shows that the VPS can successfully estimate the physical dynamical parameters of the 2-DOF shear model.
Keywords: System Identification, Variable Pendulum Sensor, State Space Model, Physical Dynamical Parameters, Two Degree of Freedom Shear Model, Vibration Test.
