1964-01-01

Designing Complex Turbo Rotor Systems with Controlled Vibration Characteristics 640379

Vibration problems with turborotors become more troublesome as machine speeds increase. Designers of today realize that the era of placing rotor critical speeds above the maximum operating speed of the equipment is long past. The dynamic system, being composed of the rotor, bearings, support structure, and even other rotors within the same machine, together with all of the excitations and damping forces significant to the dynamic problem must be understood and manipulated in a manner to make operation reliable. Today’s careful control of these parameters can prevent tomorrow’s problems.
Lycoming has developed a method that takes into account all of the significant parameters and predicts the effect of a design change on the rotor system dynamics. In addition to being used to study the effect of controlled design changes, without performing costly tests, this method has been used to predict full engine frequency response characteristics and thereby to help avoid vibration problems in the field.

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