October 4th, 2010 32261805 01 Death of Whirl Whip Print
R E S E A R C H & D E V E L O P M E N T The Death of Whirl AND Whip Use of Externally Pressurized Bearings and Seals for Control of Whirl and Whip Instability Editor’s Note: In the First Quarter 2001 issue of ORBIT, we featured an article titled “The Death of Whirl.” While important, whirl is not the only form of fluid-induced instability. Whip is often an even more vexing problem because it cannot generally be addressed by bearing stiffness modifications, but must be addressed by rotor stiffness changes instead. In this article, we show how an externally pressurized bearing can be used a
