Study of vibration on machinery faults in shaft using statistical analysis method

Chan, Sok Er (2023) Study of vibration on machinery faults in shaft using statistical analysis method. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The shaft is the most important component in a machine to transmit the rotation motion to another machine or component. An inspection is vital to reduce the breakdown of the machine due to shaft damage. Thus, the vibration of the shaft was studied in this thesis. The experiment was performed by tested stainless steel and mild steel shaft under three different conditions (normal, minimum crack and maximum crack) at different speeds (800rpm, 1200rpm and 1600rpm). The vibration of a normal shaft and cracked shaft were measured using an accelerometer and processed through Data Acquisition (DAQ) box and software Smart Office (SO) analyser. Lastly, the time domain data was transformed into vibration spectrum and statistical data, which is skewness was graphically presented with the aid of MATLAB and Microsoft Excel. Three parameters used were the speed of rotation, conditions experienced by shafts, and material of the shafts. The analysis shows a significant difference in vibration amplitude between the normal shaft and abnormal shaft. This experiment also discovers the presence of misalignment and resonance when mild steel shaft was tested. The result obtained concludes the relationship where vibration amplitude increases as the speed of rotation increases. It also shows the vibration amplitude increases as the condition of shaft getting worst.

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