目的 以基板为研究对象,获得敷设不同面积约束阻尼对基板的减振降噪效果。方法 采用驻波管、模态试验和隔声试验室等3种试验方法。结果 驻波管结果表明,随着敷设面积增大,共振峰消除,传递损失增大;模态试验结果表明,随着敷设面积增大,模态阶数减少,模态阻尼升高,减振效率提升;隔声试验室结果表明,在蒙皮典型件敷设约束阻尼后,具有降噪效果,当约束阻尼敷设面积达到56.25%时,与敷设面积75%降噪效果相当。结论 约束阻尼敷设面积为50%以上时,可在满足功能需求的前提下,避免大幅增加附加质量,同时满足民机对实际使用需求和减重的双重要求。
Abstract
The work aims to take a substrate as the research object and investigate the vibration and noise reduction effects of applying constrained layer damping (CLD) over different areas on the substrate. Impedance tube tests, modal tests and sound insulation lab tests were adopted. The impedance tube results showed that as the CLD coverage area increased, resonance peaks were eliminated and sound transmission loss improved. Modal test results showed that larger coverage areas led to a reduction in the number of modal orders, an increase in modal damping and enhanced vibration reduction efficiency. Sound insulation lab results demonstrated that applying CLD to typical skin components yielded noise reduction effect. When the CLD coverage area reached 56.25%, the noise reduction effect was equivalent to that of 75% coverage. When the CLD coverage area exceeds 50%, it meets functional requirements while avoiding a significant increase in added mass, thereby satisfying the dual demands of civil aircraft for practical performance and weight reduction.
关键词
约束阻尼 /
传递函数 /
减振效率 /
隔声量 /
驻波管 /
模态
Key words
constrained damping /
transfer function /
vibration reduction efficiency /
sound insulation /
impedance tube /
modal
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