Experimental Studies On The Noise Characteristics Of Ball Bearing Under Hexagonal Boron Nitride (hBN) Nanoparticle Additives In Engine Oil

Mohammed Al-Ghaili, Munir Mohammed (2017) Experimental Studies On The Noise Characteristics Of Ball Bearing Under Hexagonal Boron Nitride (hBN) Nanoparticle Additives In Engine Oil. Project Report. UTeM, Melaka, Malaysia. (Submitted)

Text (24 Pages) Experimental Studies On The Noise Characteristics Of Ball Bearing Under Hexagonal Boron Nitride (hBN) Nanoparticle Additives In Engine Oil.pdf - Submitted Version Download (436kB)

Abstract

The use of rolling element bearings is significant in most of the mechanical applications. Thus, the reliability and efficiency of the mechanical machines depends critically on the health of the rolling bearings. Vibration and noise generated by bearings are one of the big concerns in industry since they limit the performance of machines. Noise characteristics are to be determined for ball bearings lubricated with hexagonal Boron Nitride (hBN) nanoparticles additives in engine oil for different concentrations of concentrations of hBN namely 0.1%, 0.2%, 0.3%, 0.4%, 0.5%. A test rig consists of a motor that drive the system, coupling, rotor to support imposed loads and a bearing which its performance is to be validated. The overall performance has shown a reduction in noise level. Samples of hBN nano-lubricant with different % volume of hBN concentrations were prepared using ultrasonic homogenizing technique. Three conditions of ball bearing were investigated which are healthy bearing, inner defected bearing and outer defected bearing. Sound Level Meter was used to record the noise level for 10 minutes for each concentration and load condition and the average of the equivalent sound level for that period was calculated. The measurement of noise level has shown that the imposed load and concentration of hBN nanoparticles in the lubricant have a significant contribution to the noise level of the bearing. The noise level increases slightly with the increasing of unbalance imposed load while noise level decrease with addition of volume concentration of hBN nanoparticles.

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