The effects of shaft misalignment at different speed on vibration and sound emission

Mazda, Nur Syahirah (2016) The effects of shaft misalignment at different speed on vibration and sound emission. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Shaft misalignment are responsible for many machine problems; studies have shown that incorrect alignment is the cause for around half of machine breakdowns. Proper alignment is critical to the life of the machine, and coupling wear or failure, bearing failures, bent rotors or crankshafts, and bearing housing damage are all common effects of poor alignment. In rotating machinery, the main aspects in the cause of misalignment is excessive vibration and sound emission. By manipulating the angular misalignment, with the machine rotational speed, the findings on the levels of vibration and sound can be determined. It shows that the relationship of misalignment on the vibration and sound effect very closely. Most of the findings recorded the amplitude increases when RPM increases, and the value increases when compared with λ. Higher λ, amplitude; which indicates how much force or severity the vibration has, also becomes higher. With the findings compareed with ISO 10816; The Vibration Severity Standards, the alignment is considered to be satisfactory when the shaft parameters are within the required limits under all operating conditions of the machine. Other than that, ‘strange’ sound emitted from machine’s operation is the early indication of misalignment in the machine’s component itself. Bands of sound emission is plotted on the graph of vibration at any sudden fluctuation for easier detection at certain vibration findings.

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