ABSTRACT
In this chapter, the most important aspect of the gyroscopic effect has been included in simple rotor systems. Mainly, a quasi-static approach has been followed during analysis, but later on, a few cases with a dynamic approach are also covered. Through various examples of different boundary conditions, it is illustrated as how the gyroscopic couple affects the critical speeds and whirl natural frequencies of rotor systems. Splitting of whirl natural frequencies has been shown corresponding to the forward and backward whirls. The speed dependency of the whirl natural frequency is illustrated with examples. Also, for synchronous whirl conditions, the critical speeds have been obtained directly. Most of the concepts related with the gyroscopic effect are illustrated through examples in this chapter. Few cases of the rigid rotor mounted on flexible bearings have been considered, but more complex rotor system is not considered.
