An experimental study on a cylindrical microperforated panel space sound absorber
نویسندگان
چکیده
منابع مشابه
a study on insurer solvency by panel data model: the case of iranian insurance market
the aim of this thesis is an approach for assessing insurer’s solvency for iranian insurance companies. we use of economic data with both time series and cross-sectional variation, thus by using the panel data model will survey the insurer solvency.
Absorption of oblique incidence sound by a finite micro-perforated panel absorber.
In this paper, a theoretical model of a micro-perforated panel (MPP) backed by a finite cavity and flush-mounted in an infinite baffle is developed and its performance in terms of sound absorption is analyzed. The model allows an oblique incidence sound impinging upon the MPP absorber. The simplified Rayleigh integral method, thin plate theory and the acoustical impedance of the MPP are used to...
متن کاملRecent Developments in Applications of Microperforated Panel Absorbers
Microperforated panel (MPP) absorbers are promising as a basis for the next-generation of sound absorbing materials. A microperforated panel absorber is backed by an air-cavity with a rigid-back wall and its typical use is for a sound-absorbing ceiling. However, MPPs have some limitations and disadvantages: its sound absorbing mechanism is limited to a Helmholtz resonator caused by perforations...
متن کاملExperimental study on bubble absorber with multiple tangential nozzles
Visualization study of bubble growth with multiple tangential nozzles is investigated in a bubble absorber. Bubble behavior is studied with different flowing condition like still, co-current and counter-current flow of water. Effect of air flow rate, water flow rate, nozzle diameters, number of nozzles and orientation of nozzle angle with reference to vertical plane on bubble diameter is studie...
متن کاملExperimental study of the active sound transmission reduction through a double panel test section
The present study addresses the reduction of the sound transmission through an aircraft fuselage test section by means of a combined active noise and vibration control system, so as to reduce the noise level inside the passengers’ cabin. Experiments prove that control loudspeakers and error microphones in the trim cavity yield higher reductions in the radiated sound power than control shakers a...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Noise Control Engineering Journal
سال: 2012
ISSN: 0736-2501
DOI: 10.3397/1.3670101