SOUND TRANSMISSION LOSS OF A DOUBLE-LEAF PARTITION WITH MICRO-PERFORATED PLATE INSERTION UNDER DIFFUSE FIELD INCIDENCE

• المؤلفون الرئيسيون: Putra, Azma, Ismail, Ahmad Yusuf, Ayob, Md Razali
• التنسيق: مقال
• اللغة: English
• منشور في: Universiti Malaysia Pahang 2013
• الموضوعات: TJ Mechanical engineering and machinery; QC Physics
• الوصول للمادة أونلاين: http://eprints.utem.edu.my/id/eprint/8920/1/IJAME_Putra_2013.pdf; http://eprints.utem.edu.my/id/eprint/8920/; http://ijame.ump.edu.my/
• المؤسسة: Universiti Teknikal Malaysia Melaka

In noise control applications, a double-leaf partition has been applied widely as a lightweight structure for noise insulation, such as in car doors, train bodies, and aircraft fuselages. Unfortunately, the insulation performance deteriorates significantly at mass-air-mass resonance due to coupling between the panels and the air in the gap. This paper investigates the effect of a micro-perforated panel (MPP), inserted in the conventional double-panel partition, on sound transmission loss at troublesome resonant frequencies. It is found that the transmission loss improves at this resonance if the MPP is located at a distance of less than half that of the air gap. A mathematical model is derived for the diffuse field incidence of acoustic loading.