There is a close link between the pressure pulsation in the centrifugal ventilator working cavity and its noise level. The noise and pressure pulsation spectra of centrifugal ventilators are represented by a broadband noise to which clearly discernible discrete components are superimposed. Generally it is blade-passing frequencies (BPF). The level of these tone components mainly determines the ventilator noise characteristics, as the tonal noise is much uncomfortable for men's ear. Studies of centrifugal machines show that, as a rule, the discrete BPF component and its harmonics have maximum spectral amplitudes of pressure pulsations and noise under the rated operation mode. The current version of Harmony software package is developed for numerical modelling of pressure pulsations at blade passing frequencies.
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