In an active control system of pipe pulsation, line spectrum noise generated by pump source operation can cause larger errors to the secondary path identification results. Here, in order to solve this problem, effects of shutdown and starting of pump source on the secondary path modeling were theoretically analyzed. The adjacent frequencies interpolation method was proposed to model the secondary path, and effectively avoid the line spectrum noise source. Under the condition of pump source working, two secondary path models at adjacent frequency points on both sides of the frequency point were identified. Amplitudes and phases of the two models were extracted, respectively and then linear interpolations were done for them, respectively. The gained results were taken as amplitude and phase features of the secondary path at the frequency point . The feasibility of the adjacent frequencies interpolation modeling method was verified with the identified results in a test system for active control of pipe pulsation. The proposed modeling method was applied in the improved FxLMS algorithm to obtain the good control effect of multi-line spectrum being stable at level of more than 25 dB in the test system.
Key words
pipe pulsation /
active control /
secondary path modelling /
line spectrum noise interference /
adjacent frequencies interpolation
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