By Mark S. Darlow

Modern rotating equipment, relatively turbomachinery, is often being designed to function at better speeds than long ago. for this reason, there's an elevated have to stability high-speed rotors. the aim of this booklet is to supply the engineering scholar or practising engineer with a unmarried, entire reference on high-speed rotor balancing. To this finish, a close analytical heritage and useful software systems are provided for every of the vital high-speed rotor balancing tools, i.e. modal balancing, impression coefficient balancing and the Unified Balancing method. this knowledge is supplemented and supported via a presentation of the theoretical improvement of synchronous rotor vibration and a short review of inflexible rotor balancing innovations and machines. this can be the 1st time this fabric comes in a unmarried, concise quantity, including specific descriptions of program procedures.

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Wang [142] proposed the use of a general optimization approach with correction mass size and residual response constraints. Nicholas, Gunter and Allaire studied the unbalance response [97] and balancing [98] of a single mass flexible rotor with residual shaft bow. They determined that the optimum results were obtained by reducing the total rotor amplitude, including shaft bow, to zero at the critical speed, and to levels less than or equal to the bow at other speeds. However, this requires prior knowledge of the critical speed, which is not often known with sufficient accuracy.

16 but longitudinally non symmetric, will not exhibit purely translatory and conical modes of vibration. Instead, this rotor will have two rigid-body critical speeds whose mode shapes are each a combination of translatory and conical whirl. Generally speaking, the translatory whirl predominates for one of these mode shapes while the conical whirl predominates for the other. 18. 68). 18 Rotor Model for Coupled Translational-Conical Jeffcott Analysis These equations are derived using superposition of the translatory and conical unbalance distributions and modes of vibration, where the total resultant vibration is a linear combination of pure translatory and pure conical motion.

This method includes an unspecified procedure to account for inaccuracies in the predicted critical speeds. However, there is no apparent way to account for errors in the modal damping ratios, which could substantially affect the predicted modal sensitivities. Also, while this method provides for light damping, it appears that the traditional modal balancing assumption of planar mode shapes is still invoked, as all of the examples presented result in planar modal mass sets. Morton [94] attempted to avoid the difficult issue of predicting rotor support properties by defining the response to be a combination of free modes and rigidly supported modes, which can generally be predicted with reasonable Review of Literature on Rotor Balancing 45 accuracy.

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