The Protection of Steam-Turbine Disk Wheels From Axial Vibration

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Abstract
One of the most important features in the design and manufacture of a steam turbine is the elimination of the possibility of vibration occurring at the various natural frequencies of its disk wheels and buckets. This paper describes an investigation by the General Electric Company of various forms of vibrations and waves which may exist in steam-turbine disk wheels. The dangerous critical speeds that must be guarded against are discussed, together with other minor resonant conditions that it is advisable to avoid. The testing machines used for verification of predicted frequencies and critical speeds are described in detail as well as the different types of tests made. The conclusion gives the procedure, necessary in all cases, for the definite protection of steam-turbine bucket wheels from axial vibration, as justified by several years of successful manufacture.

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