Metrological calibration and uncertainty evaluation of MEMS accelerometers for structural health monitoring in seismic regions

This study presents a metrological assurance framework for MEMS accelerometers used in structural health monitoring (SHM) of buildings in seismically active regions. The methodology integrates ISO 16063-21 calibration, JCGM 100 (GUM) uncertainty evaluation, and field validation. Three MEMS accelerometers (ADXL355, MPU-6050, LIS3DHH) were calibrated across 1-200 Hz at 0.1-1.0 g. The expanded uncertainty ( k = 2) ranged from 2.3 % to 5.8 %. Field validation on a five-story building in Tashkent confirmed that the ADXL355 estimates natural frequencies within 1.2 % of a reference accelerometer ( R 2 = 0.999). The ADXL355 satisfies ISO 16063-21 requirements and provides adequate performance for seismic zones VII-IX. The proposed framework contributes to standardized low-cost vibration monitoring procedures in Central Asia.