摘要
针对实际应用中空间尺寸的限制和吸声性能的要求,提出倾斜微穿孔板吸声结构。首先,用虚拟的隔板将倾斜微穿孔板吸声结构分成有限个等宽的吸声胞元体,每个吸声胞元体的背衬空腔厚度均不相等。基于马大猷微穿孔理论和声阻抗并联原理,采用传递函数法获得不同穿孔方向倾斜微穿孔板吸声结构的吸声性能表达式。理论计算结果与现有实验测试结论相吻合。结果表明,微穿孔方向对结构吸声性能的影响较明显,适当调整微穿孔方向可获得满意的吸声系数。
In practical application, an inclined micro-perforated panel（IMPP） absorber is introduced to improve sound absorption performance. First, the IMPP absorber can be visualized as a combination of series of the traditional MPP absorbers with a large number of air cavities of different depths. The sound absorption characteristics of the IMPP absorber for different incident angles and perforated direction of perforations are derived, based on the MPP theory and the parallel connection rule of acoustic impedance. In order to verify the theoretical model, the prediction of the model is compared with the existing experimental results. Using the proposed model, the perforated direction of perforations, the inclined angle, and the micro-perforated diameter show great effects on the sound absorption characteristics of the inclined micro-perforated panel absorber.
作者
宁景锋
赵桂平
NING Jingfeng;ZHAO Gulping(School of Science, Xi＇ an University of Posts ＆ Telecommunications, Xi＇ an 710121, China;State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi＇ an Jiaotong University, Xi＇an 710049, China)
出处
《噪声与振动控制》
CSCD
2018年第A01期239-241,共3页
Noise and Vibration Control
基金
西安交通大学国家重点实验室开放课题资助项目(SV2018-KF-12)
关键词
声学
倾斜微穿孔板
吸声性能
微穿孔方向
声阻抗
acoustics
inclined MPP absorber
sound absorption
perforated direction of perforations
acoustic impedance
