摘要
现有测量飞机壁板构件隔声性能的方法主要有两种:“声压法”和“声强法”。这两种方法在低频段测量值差异较大,同时该频段也是航空发动机噪声源的主要频段。因此,研究测试飞机壁板低频隔声性能的方法十分必要。以投影尺寸为540 mm×540 mm的飞机壁板为研究对象,基于数字图像相关技术,通过试验获取飞机壁板的模态特征;随后,依次采用“声压法”和“声强法”完成该壁板在四周嵌定边界约束条件下的隔声性能测试。结果表明,壁板构件1阶模态频率为176 Hz,2阶模态频率为217 Hz,隔声量测试曲线的1阶隔声谷值频率位于这两阶模态频率之间。当采用“声压法”测量壁板构件时,必须考虑Waterhouse的低频修正;在实验室条件不满足规定要求的前提下,测量壁板构件的低频隔声性能时更推荐采用“声强法”。
The existing methods for measuring the sound insulation performance of aircraft wall panels mainly include two types:sound pressure method and sound intensity method.There are significant measurement differences between the two methods in the low-frequency range,which is also the main frequency range of aircraft engine noise sources.Therefore,it is necessary to study the testing methods for the low-frequency sound insulation performance of aircraft wall panels.In this paper,an aircraft wall panel with a projection size of 540 mm×540 mm was taken as the research object.Based on digital image correlation technology,the modal characteristics of the aircraft wall panel were experimentally obtained.Subsequently,the sound insulation performance tests of the wall panel under the constraint boundary conditions were completed sequentially using the sound pressure method and sound intensity method.The results show that the first-order modal frequency of the panel component is 176 Hz,and the second-order modal frequency is 217 Hz.The 1st order frequency of the valley value of the sound insulation test curve is located between these two modal frequencies.When using the sound pressure method to measure the panel component,it is necessary to consider Waterhouse's low-frequency correction.When the laboratory conditions do not meet the specified requirements,it is strongly recommended to use the sound intensity method to test the low-frequency sound insulation performance of the panel components.
作者
刘艳
周昊瑞
李秋彤
LIU Yan;ZHOU Haorui;LI Qiutong(Shanghai Key Laboratory of Engineering Materials Application and Evaluation,Shanghai Research Institute of Materials Co.,Ltd.,Shanghai 200437,China;Shanghai Engineering Research Center of Earthquake Resistant Energy Dissipation,Shanghai Research Institute of Materials Co.,Ltd.,Shanghai 200437,China)
出处
《噪声与振动控制》
北大核心
2025年第5期292-297,共6页
Noise and Vibration Control
基金
国家重点研发计划资助项目(2021YFB3801804)
上海张江国家自主创新示范区专项发展资金资助项目(ZJ2021-ZD-006)。
关键词
声学
飞机壁板
隔声量
声压法
声强法
acoustics
aircraft panel
sound insulation
sound pressure method
sound intensity method
