Rotor

Stability of an Aerodynamic Body with a Rotor

The stability of an aerodynamic body with a rotor is investigated for the following conditions: pitching and yawing of a nonrolling body with balanced rotor; pitching and yawing of a nonrolling body with unbalanced rotor; pitching and yawing of a steadily rolling body with balanced rotor. The aerodynamic body with a rotor is stable provided that the viscous damping and spring constant for the system are positive and that the ratio of the moment of inertia of the rotor about its rotational axis to the moment of inertia of the body with rotor about its pitch or yaw axis is less than approximately 0.90.

The Log

Rotor Dynamics

The Third Revised And Enlarged Edition Of The Book Presents An In-Depth Study Of The Dynamic Behaviour Of Rotating And Reciprocating Machinery. It Evolved Out Of Lectures Delivered At Different Universities Over The Last Two Decades. The Book Deals With Torsional And Bending Vibrations Of Rotors, Stability Aspects, Balancing And Condition Monitoring. Closed Form Solutions Are Given Wherever Possible And Parametric Studies Presented To Give A Clear Understanding Of The Subject. Transfer Matrix Methods Is Extensively Used For General Class Of Rotors For Both Bending And Torsional Vibrations.Special Attentions Are Given To Transient Analysis Of The Rotors Which Is Becoming An Essential Part Of The Design Of High Speed Machinery. Systems With Fluid Film Bearings, Cracked Rotors And Two Spool Rotors Are Also Presented.A First Course On Theory Of Vibration Is A Prerequisite To This Study. Analysis Used Is Fairly Simple, But Sufficiently Advanced To The Requisite Level Of Predicting Practical Observations. As Far As Possible, Practical Examples Are Illustrated, So That The Book Is Also Useful To Practising Engineers.A Special Feature Of This Book Is Diagnostics Of Rotating Machinery Using Vibration Signature Analysis And Application Of Expert Systems To A Field Engineer In Trouble Shooting Work.