KARAKTERISTIK GETARAN GENERATOR PADA KASUS UNBALANCE BERDASARKAN DATA VIBROPORT DAN MEMS AKSELEROMETER ADXL345

Abstract

This study aims to analyze the vibration characteristics of a 3 kW generator due to unbalance and to compare the performance of the Vibroport 80 vibration meter with the ESP32-based MEMS ADXL345 accelerometer sensor. Unbalance conditions were created by adding 10 g, 15 g, and 20 g of mass to the generator fan at a rotational speed of ±1,491 RPM (24.8 Hz). Radial vibration data were processed using the Fast Fourier Transform (FFT) method to obtain frequency spectra and velocity RMS values. The results show that unbalance is characterized by dominant amplitude at the 1×RPM frequency (24.8–25.0 Hz), which increases proportionally with added mass, reaching 1.89 mm/s, 2.11 mm/s, and 2.81 mm/s (Vibroport). Comparison between the two instruments shows good agreement in dominant frequency identification, with deviations of 0–0.59 Hz, although ADXL345 amplitude values tend to be slightly lower, with average deviations of 0.20–0.66 mm/s. Therefore, the ADXL345 sensor has potential as a low-cost vibration monitoring tool for detecting dominant frequency trends caused by unbalance, although further calibration is required for absolute amplitude accuracy.