Rotating Machinery Vibration

Influence of the Supporting Structure Dynamic Behaviour on the Shaft Vibration of a Real Rotating Machine

“…This machine model also includes the speed-dependent dynamic stiffness coefficients of the oil-film journal bearings, as well as a simple simulation of the mechanical characteristics of the generator foundation. The flexural critical speeds of the auxiliary shaft and the generator have been evaluated by means of an eigenvalue analysis [1][2][3][4]. For the sake of brevity, only the results that concern the machine dynamic behaviour in the operating condition are shown.…”

Model of vibrodiagnostic procedure for predictive maintenance of rotary machines

“…The fact is that there are no defects in rotary machines that can develop fast, except for hidden defects that occurred in the process of making parts and their assembly. Therefore, the basic features of vibration diagnostics can be expressed as follows [4]:  It is necessary to perform vibration measurements of each machine part for which there is no specific method for detecting defects in the beginning;  Diagnosis is more efficient to perform on highfrequency vibrations that can be excited by relatively small forces that develop in the early stage of malfunction. To present the existing diagnostic methods for different parts of rotary machines, it is necessary to fulfill the main rule of quantitative diagnostics -the condition of the machine must be determined by the deviation of diagnostic parameters from their standard value.…”

Acoustic response of 100 Cr 6 (SAE 52100 chrome steel) material ball bearing in experimental oil starvation failure modes

“…The effect achieved on rotor by unbalance is one of the causes that bring out some physical symptoms. This type of failure will show increasing amplititude in harmonics, but the reason of these harmonics might be some other failures as well [12]. Babak et al studied shaft breakage with acoustic emission, vibration and current analysis on an dynamic gearbox system.…”