摘要
为了改善闭孔泡沫铝吸声结构表面性状,降低双层闭孔泡沫铝成本,扩大吸声结构的吸声频段,将打孔闭孔泡沫铝与打孔铝板组成复合结构,研究了铝板与闭孔泡沫铝板复合结构的吸声性能。使用驻波管吸声系数测试仪对复合结构在不同背后空腔条件下的吸声性能进行测试。结果表明,当铝板与闭孔泡沫铝板间留有空腔时,低频吸声系数较未复合时大大提高,整体吸声系数都有所提高,吸收峰的中心频率相对于单测时发生了移动;当铝板紧贴闭孔泡沫铝板放置时,会导致吸声系数略有降低,但随铝板打孔率的升高,整体吸声系数又逐渐升高,而吸声主频段不变。
The composite structure was assembled by closed-cell aluminum foam and aluminum plate in order to improve the property of composite structure of closed-cell aluminum foam, reduce double closed-cell aluminum foam costs and increase the sound-absorbing band of absorption structure. The acoustic absorption performance of this composite structure was measured by using standing-wave tube absorption tester. The results show that the sound-absorbing coefficient in low frequency is higher comparing with the closed-cell aluminum foam without combined, the whole absorbing coefficient is improved and the center frequency of absorbing peak shifts comparing with unilateral structure; the absorbing coefficient decreases slightly, but the overall absorption coefficient increases with the increase of aluminum plate punching rate, and main frequency of sound absorption remains unchanged when aluminum plate is close to the closed-cell aluminum foam.
出处
《有色金属工程》
CAS
CSCD
北大核心
2016年第4期22-25,29,共5页
Nonferrous Metals Engineering
基金
国家自然科学基金青年基金资助(51404187
51304153)
关键词
闭孔泡沫铝
打孔
铝板
吸声系数
closed-cell aluminum foam
perforate
aluminum plate
absorption coefficient
