一种多层复合结构防护耳罩
Through a multi-layer composite structure design, combined with spiral channel and micro-cavity coupling, the shortcomings of existing earmuffs in low-frequency sound absorption, sound wave attenuation and multi-frequency control are solved, achieving efficient and stable wide-band noise absorption, suitable for complex noise environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TIANJIN UNIV
- Filing Date
- 2025-09-09
- Publication Date
- 2026-07-17
AI Technical Summary
Existing earmuffs are vulnerable to high-energy, complex spectral noise environments. Low-frequency sound waves have strong penetration capabilities, and existing structures cannot effectively absorb them. Single-layer material structures have short sound wave attenuation paths and insufficient energy dissipation. Active noise cancellation systems are unstable and cannot achieve multi-band coordinated control.
It adopts a multi-layer composite structure design, combining perforated pilot, cavity resonance, helical viscous dissipation and multi-layer foam sound absorption mechanism. Through the coupling structure of helical channel and micropore-cavity, the low-frequency absorption performance is enhanced, and multi-band coordinated control is achieved through composite sound-absorbing foam with progressively increasing density and gradient perforation group.
It significantly improves low-frequency sound absorption performance, achieves efficient absorption across a wide frequency range, has high system stability, is suitable for more complex and intense noise environments, and provides high-intensity hearing protection.
Smart Images
Figure CN121337543B_ABST
Abstract
Citation Information
Patent Citations
Expanded polytetrafluoroethylene film-polyurethane foam surface composite full-band strong sound-absorption sheet and preparation method thereof
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Sound-attenuating earmuff having isolated double-shell structure
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