Damping Properties of Steam Turbine Blades,
STRESS TECHNOLOGY INC ROCHESTER NY
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Material hysteresis, attachment friction and gasdynamic effects are recognized sources of damping in turbomachinery blading. No comparison study of their relative effectiveness appears to have been made, although there are diverse opinions on this topic. This overview paper describes a series of tests which were made to examine the damping properties of several types of steam turbine blades. One objective was to determine the relative contributions from the above damping sources in these blade types. These studies were conducted in a non-rotating damping test rig which used blades mounted in corresponding real disk root attachments.