关键词: 消声器, 波纹管, 回流腔, 有限元法, 传声损失

Abstract: Aiming to address the limitations of traditional mufflers in controlling mid-low frequency transformer noise, this study proposes a composite silencer structure combining corrugated walls with a backflow cavity. By replacing flat walls with corrugated configurations and optimizing acoustic performance through backflow cavity integration, an enhanced corrugated composite muffler was developed. Parametric analysis was performed to investigate structural parameter effects on sound absorption, followed by noise spectrum-based optimization for 220kV transformers, resulting in a cascaded corrugated composite silencer. Research reveals that the synergy between corrugated walls and backflow cavity efficiently dissipates mid-low frequency noise through optimized acoustic impedance matching. The improved silencer achieves an average sound insulation of 58.81 dB across 20-1000 Hz, offering a new solution for power equipment noise control.

Key words: silencer, corrugated duct, reflux cavity, finite element method, sound transmission loss