By Mark S. Darlow
Modern rotating equipment, fairly turbomachinery, is usually being designed to function at larger speeds than long ago. therefore, there's an elevated have to stability high-speed rotors. the aim of this booklet is to supply the engineering pupil or training engineer with a unmarried, entire reference on high-speed rotor balancing. To this finish, a close analytical heritage and functional software approaches are provided for every of the relevant high-speed rotor balancing tools, i.e. modal balancing, impact coefficient balancing and the Unified Balancing process. this knowledge is supplemented and supported via a presentation of the theoretical improvement of synchronous rotor vibration and a quick evaluation of inflexible rotor balancing strategies and machines. this can be the 1st time this fabric comes in a unmarried, concise quantity, including special descriptions of software procedures.
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Additional resources for Balancing of High-Speed Machinery
However, as these rotors became more flexible, and were often operated supercritically, the existing balancing procedures became inadequate. This led to the development of a number of balancing methods specifically designed for flexible rotors. Flexible rotor balancing procedures can generally be divided into two groups, modal balancing and influence coefficient balancing, as defined in Chapter 1, of which modal balancing was developed first. The development of modal balancing began in the early 1950s.
An early balancing technique, akin to modal balancing, was described by Grobel  in 1953. This method was a trial mass procedure which was designed specifically for balancing turbine-generator rotors. Grobel also presented detailed descriptions of several practical problems associated with turbine-generator balancing. Meldal  first developed the orthogonality relations governing modal rotor response, and thus laid the theoretical foundation for modal balancing, in 1954. Based on these relations, he outlined the principles of modal balancing, and described the procedure for balancing a rotor through its ftrst three modes.
In these tests, the influence coefficients were calculated, and continually improved, through the use of his algorithm. The use of these influence coefficients aided substantially in the balancing of these rotors and, toward the end of a production run, permitted the use of fewer, or in some cases no, trial mass runs. Drechsler  has proposed a similar procedure for applying the tools of statistical analysis to the calculation of influence coefficients. However, his discussion was concerned primarily with feasibility and a general approach, and lacked the detail and development of Larsson's presentation.
Balancing of High-Speed Machinery by Mark S. Darlow