Experimental models are an important means to gather knowledge about the behaviour of physical systems. In particular a reduced scale rotor bench can help in testing the performance of rotor vibration control devices such as magnetorheological squeeze-film dampers. In order to implement a classical control the dynamic model of the damper must be completely known and validated. Therefore a suitable apparatus aimed at the identification of the parameters of the devised model as function of the excitation frequency and of the electric current generating the magnetic field was set up and interfaced to a modified Bently-Nevada Rotor-Kit. Eddy current displacement sensors measured the dynamic response of the shaft to the synchronous rotating unbalance force while a triaxial load cell placed between the damper and the Rotor-Kit pedestal measured directly the forces transmitted by the shaft to the damper. On the basis of such measurements the dynamic stiffness, damping and adjoint mass coefficients, related to a linear model of the MR fluid were determined by means of a parametric identification technique.
Experimental Model of a Semi-Actively Controlled Rotor
CARMIGNANI, COSTANTINO;FORTE, PAOLA;
2007-01-01
Abstract
Experimental models are an important means to gather knowledge about the behaviour of physical systems. In particular a reduced scale rotor bench can help in testing the performance of rotor vibration control devices such as magnetorheological squeeze-film dampers. In order to implement a classical control the dynamic model of the damper must be completely known and validated. Therefore a suitable apparatus aimed at the identification of the parameters of the devised model as function of the excitation frequency and of the electric current generating the magnetic field was set up and interfaced to a modified Bently-Nevada Rotor-Kit. Eddy current displacement sensors measured the dynamic response of the shaft to the synchronous rotating unbalance force while a triaxial load cell placed between the damper and the Rotor-Kit pedestal measured directly the forces transmitted by the shaft to the damper. On the basis of such measurements the dynamic stiffness, damping and adjoint mass coefficients, related to a linear model of the MR fluid were determined by means of a parametric identification technique.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
