Today, digital signal processing based on new microprocessor technology allows for successful machine protection and is acceptably cost-effective. Furthermore, by means of vibration-diagnostics monitoring of machines ...Today, digital signal processing based on new microprocessor technology allows for successful machine protection and is acceptably cost-effective. Furthermore, by means of vibration-diagnostics monitoring of machines assisted by analytical methods it is possible to monitor and quantify dynamic parameters of a machine. By means of the analysis of dynamic behavior of rotor, it is possible to diagnose and solve the defects relating to rotor and other parts of machine. Recently, vibrations analysis and monitoring have become the most widespread method of machine diagnostics. Detection, identification and elimination of problems related to machine work can be simplified by modeling some dynamics solutions. The paper presents a mathematical model of elastic rotor with concentrated weight designed for the purpose of detecting defects with the help of vibrations measured by sensors based in bearings. Experimental results from test tables of the world＇s leading company, Bentley Nevada Co. USA, were used as the basis for development of this model. Accordingly, mathematical model for most of the cases was based on radial oscillation of rotor while torsion oscillations were used as the basis in some cases. Torsion vibrations cannot be detected without special sensors even at their highest magnitudes. Reliability of this model and accuracy of vibrodiagnostic analysis has been experimentally confirmed when applied on machines in operation.展开更多
文摘Today, digital signal processing based on new microprocessor technology allows for successful machine protection and is acceptably cost-effective. Furthermore, by means of vibration-diagnostics monitoring of machines assisted by analytical methods it is possible to monitor and quantify dynamic parameters of a machine. By means of the analysis of dynamic behavior of rotor, it is possible to diagnose and solve the defects relating to rotor and other parts of machine. Recently, vibrations analysis and monitoring have become the most widespread method of machine diagnostics. Detection, identification and elimination of problems related to machine work can be simplified by modeling some dynamics solutions. The paper presents a mathematical model of elastic rotor with concentrated weight designed for the purpose of detecting defects with the help of vibrations measured by sensors based in bearings. Experimental results from test tables of the world＇s leading company, Bentley Nevada Co. USA, were used as the basis for development of this model. Accordingly, mathematical model for most of the cases was based on radial oscillation of rotor while torsion oscillations were used as the basis in some cases. Torsion vibrations cannot be detected without special sensors even at their highest magnitudes. Reliability of this model and accuracy of vibrodiagnostic analysis has been experimentally confirmed when applied on machines in operation.
