摘要
介绍了新一代运载火箭整流罩全频域声振分析及隔声降噪研究。阐述了全频域分析用于中频的有限元结合统计能量(FE-SEA)混合分析方法的基本原理。以新一代整流罩为研究对象,分别用有限元(FEM),FESEA,统计能量(SEA)法建立了低、中、高频段的整流罩模型,分析了整流罩内有效载荷的噪声环境和随机振动响应。比较了复合材料和金属材料整流罩的降噪效果,发现在中低频段复合材料整流罩的隔声效果优于铝合金,在中高频段铝合金整流罩的隔声效果更好。为进一步改善复合材料整流罩内噪声环境,通过在整流罩内贴吸声材料对整流罩进行隔声降噪,结果表明在整流罩内壁增加聚酰亚胺泡沫可明显降低高频段的噪声,提高整流罩的隔声降噪能力,内声场随吸声材料厚度增加而降低(厚度20,30,50mm分别可降低2.1,5.38,9.51dB)。
The basic processes of vibro-acoustic and noise reduction analysis in full frequency-domain of a new launch vehicle fairing were carried out in the paper.The vibro-acoustic analysis method in mid-frequency analysis theory of FE-SEA was described.The FEM,FE-SEA and SEA methods were used to model the new launch vehicle fairing,and the inner sound of the launch vehicle fairing and the random vibration were analyzed.The noise reductions of composite material and metal faring were compared.The result showed the noise reduction of composite material faring was better than the metal faring in low-mid frequency and worse in mid-high frequency.In order to improve the inner sound environment,the sound-absorbing material was pasted on the new composite material fairing.The analytical results showed that the inner noise would reduce apparently in high frequency by pasting ployimide material in inner wall of faring.The inner acoustic field would decrease by increasing the ployimide material for 2.1,5.38 and 9.51 dB with thickness 20,30,50 mm respectively.
出处
《上海航天》
2016年第B05期29-35,共7页
Aerospace Shanghai
关键词
整流罩
有效载荷
全频域
混合建模
有限元结合统计能量法
声振响应
隔声降噪
聚酰亚胺
Launch vehicle fairing
Payload
Full frequency-domain
Hybrid modeling
Finite element-statistical energy
Vibro-acoustic
Noise reduction
Ployimide
作者简介
胡迪科（1984-），男，硕士。主要从事运载火箭力学环境条件设计。
