Abstract
HVDC converter station noise is mainly in medium frequency band, but the thickness of the conventional duct silencers are equivalent to the working wavelength, which makes them difficult to apply in narrow spaces. In this paper, through parallel and serial coupling of imperfect Helmholtz resonators with interpolated neck, a hybrid silencer with broadband perfect absorption is presented, which remain above 10 dB from 568 to 992 Hz with a thickness less than 20mm. In order to reveal the underlying physical properties and acoustic performance, simulations considering the coupling of acoustics and thermodynamics and impedance analysis are performed, showing a good consistency, and it’s further verified by experimental result. The results of research can help design effectively, ultra-thin and wide-band duct silencer for HVDC converter station medium frequency band noise control.
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