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2 International Journal of Applied Mechanics and Engineering

2 2001

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On the influence of labyrinth seals on the dynamic behaviour of rotors

D'Agostino V., Guida D.

International Journal of Applied Mechanics and Engineering

2001

Vol. 6, no 4

1089-1098

The influence of the labyrinth seals on the dynamic behaviour of a flexible rotor in journal bearings is investigated. In particular a code which makes possible the determination of the stiffness and damping coefficients and the calculus of the stability threshold in the absence of unbalance is discussed. The pressure field in journal bearings and in the labyrinth seal is determined using Warner's hypothesis and the bulk-flow model with two-control-volume, respectively.

Active magnetic bearings test rig for experimental investigation of seals

D'Agostino V., Guida D.

International Journal of Applied Mechanics and Engineering

2001

Vol. 6, no 4

1099-1107

A test rig for the experimental validation of the rotordynamic coefficients of annular and labyrinth seals using Active Magnetic Bearings (AMBs) exciters is presented. The rotordynamic coefficients for annular and labyrinth seals are obtained, with two computer programs using the Reynolds' gas lubrication equation and the bulk flow model with two volume control, respectively. The AMBs exciters allow the rotor to levitate without contact, and to excite it with user-defined sinusoidal forces at the same time. The dynamic experiments can be conducted at various rotor speeds, whirling speeds, and with different pressure drops across the seal.