Experimental study to identify the effect of type of coupling on unbalance using frequency spectrum analysis

Abstract

Any defect in machine will affect vibration behavior and nature of this effect is different for different faults. Understanding and practicing the fundamentals of rotating shaft parameters is the first step in reducing unnecessary vibration, reducing maintenance costs and increasing machine uptime. Hence condition monitoring based on vibration measurements can be used to identify those defects qualitatively. Vibration signals give early indication of mechanical failures such as misalignment, unbalance and bent shaft etc. The present study deals with experimental investigation of unbalance with the help of FFT analyzer and its unique vibration spectrum for different types of couplings such as jaw coupling, flexible flange coupling and rigid coupling. Understanding and practicing the fundamentals of rotating shaft parameters is the first step in reducing unnecessary vibration, reducing maintenance costs and increasing machine uptime. Many researchers have reported unbalance related faults show dominant peak at 1×. For experimental identification of unbalance an experimental setup is constructed and frequency spectrum is acquired for jaw coupling, flexible flange coupling and rigid flange coupling. These acquired spectrums are compared with available literature for confirmation of experiment results. The experimental results are in close agreement with results available in literature.