This paper deals with the construction and tests of two types of vibration dampers, selected from a number of original proposals, designed to damp out the vibration in steam-turbine impulse blades. These dampers were tested using models constructed of such size and physical dimensions as to simulate the conditions of operation in the actual turbine blade. Test results show that if a properly designed damper is attached to a freely vibrating system having 26 times the mass of the damper, it will reduce an initial deflection of the vibrating system to 4 per cent of its value in 10 cycles.

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