| 摘要 |
PURPOSE: A composite triangular damper is provided to improve noise reducing effects without the height increase of a soundproof wall. CONSTITUTION: A composite triangular damper comprises a sound absorbing unit, a local reaction unit, and a path difference guide unit. The sound absorbing unit has sound absorbing layers(120) for absorbing sound waves. The local reaction unit is formed on the top of the sound absorbing unit and has resonance layers(220) for guiding the resonance of sound waves. The path difference guide unit is formed on the top of the local reaction unit and has guide ways(320) for guiding the path difference of sound waves.
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