Abstract
Low-frequency damping systems for the pressure pulsations in a pipeline system are investigated in a mockup of the fourth loop of a nuclear power plant. The acoustic characteristics of Helmholtz resonators are calculated. Acoustic tests are conducted to reduce the vibration at the blade frequencies of the circulation pump. It is shown that the efficiency of such structures depends both on the accuracy with which the resonator eigenfrequencies are matched to the blade frequency of the vibration source and on the resonator location within the pipeline system.
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