International Journal of Science, Engineering and TechnologyAuthors: Bhavya Ajit Agarwal, Toushif Ahmed Khan, Krishnanshu Agrawal, Shreyansh Choudhary, Dr. Saravanakumar R
Abstract: Continuous structural health monitoring is vital for assessing civil infrastructure integrity under seismic excitations and environmental degradation. Traditional manual visual inspections are periodic, qualitative, and incapable of capturing transient dynamic responses. This paper presents a virtual instrumentation framework developed in LabVIEW for real-time seismic vibration simulation, dynamic response monitoring, and structural damage detection. A base-excited single-degree-of-freedom mass-spring-damper model is implemented to simulate structural dynamics under ambient shaking, resonance, sudden stiffness reduction, structural tilt, and pseudo-random earthquake ground motion. The virtual instrument tracks critical dynamic indicators including fundamental natural frequency, roof-to-base transmissibility ratio, instantaneous roof acceleration, and tilt angle, triggering a multi-criteria threshold alarm logic upon abnormal state detection. Simulation findings demonstrate that a 48.5% loss in lateral stiffness (from 1300 N/m to 670 N/m) induces a 0.51 Hz downward shift in natural frequency (from 1.81 Hz to 1.30 Hz), confirming frequency tracking as a sensitive damage indicator. A proposed hardware acquisition architecture incorporating dual MEMS accelerometers (ADXL345 and MPU6050) interfaced via microcontroller serial streaming to LabVIEW VISA is documented. This prototype provides an educational testbed for structural dynamics and non-destructive damage diagnosis.
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