Published Paper Details:

This study investigates the influence of lubricant viscosity on the vibration behavior of rolling element bearings through a controlled experimental analysis. Using a custom-built test rig, cylindrical roller bearings (NJ306 ECJ) were subjected to three lubricant grades (NLGI 1, NLGI 2, and NLGI 3), three loads (3 kg, 6 kg, and 9 kg), and three rotational speeds (300 rpm, 600 rpm, and 900 rpm). Vibration responses were measured using a Fast Fourier Transform (FFT) analyzer to quantify frequency spectra and amplitudes. Results indicate that NLGI 2 grease consistently exhibited the lowest vibration amplitudes across all conditions, demonstrating superior damping and stability compared to NLGI 1 and NLGI 3. Higher viscosity (NLGI 3) led to increased vibration due to inadequate penetration, while lower viscosity (NLGI 1) showed limitations under high loads and speeds. These findings highlight the critical role of optimal lubricant viscosity in minimizing vibration and enhancing bearing longevity, offering practical insights for machinery design and maintenance. The study contributes to tribology by providing empirical evidence to guide lubricant selection in industrial applications