Investigation on micro-perforated panel absorber with ultra-micro perforations
Authors: Y.J. Qian, D.Y. Kong, S.M. Liu, S.M. Sun, Z. Zhao
Abstract:
Micro-perforated panel (MPP) absorber has been widely used in noise reduction and is regarded as a promising alternative to the traditional porous materials. However, the absorption bandwidth of a single MPP is always insufficient to compete with the porous materials. Thus its practical application such as interior finish of room walls which has strict restrictions on space is prevented. According to Maa’s theory, a possible approach to obtain high sound absorption over broad frequency band is to reduce the perforation diameter and increase the density of the perforation properly. And the absorption limits of a single MPP even can be obtained by reducing the perforation diameter to less than 100 lm. However, it’s difficult for traditional processing technology such as machining punching to fabricate such small perforations, thus MPPs with ultra-micro perforations have seldom been reported yet. In this paper, trial production of MPPs with ultra-micro perforations based on MEMS technology and measurement of their normal absorption coefficients were carried out. Results show that better absorption capability can be given with MPPs by using a ultra-micro perforation. Maa’s conclusion that MPP absorbers can satisfy high sound absorption in broad frequency range by reducing the perforation diameter is therefore validated experimentally.
Keywords:
Micro-perforated panel (MPP)
Ultra-micro perforations
Absorption capability
Published in: Applied Acoustics (Volume 74, Issue 7, July 2013)
Publisher: Elsevier
ISSN Information: 0003-682X
Investigation on micro-perforated panel absorber with ultra-micro perforations
- Vòng Sơ Khảo Cuộc Thi Đại Sứ Văn Hóa Đọc Năm 2024
- Ngày hội sách “CITTADELLA” khuyến khích và tôn vinh vai trò của sách trong sinh viên Bách khoa
- Cuộc Thi Ảnh “Khoảnh Khắc VNUHCM Libraries”
- Ngày hội Văn hóa đọc lần VI
- Ngày hội văn hóa đọc lần V
- Ngày hội văn hóa đọc lần II
- Ngày hội văn hóa đọc lần IV
- Ngày hội văn hóa đọc lần III
- Tiếp GS Omer Mert Denizci, Trường ĐH Marmara Thổ Nhĩ Kỳ
- Tiếp Cô Claudia Tarzariol Từ The University Of Trento, Italy (Unitrento)
- Tiến sĩ kiều bào Mỹ tặng sách trị giá 150.000 USD cho sinh viên bách khoa
- Khảo sát ý kiến bạn đọc
-
Trực tuyến:4
-
Hôm nay:740
-
Tuần này:8620
-
Tuần trước:35602
-
Tháng trước:41459
-
Tất cả:4063355