Experiments on the active reduction of sound transmission through light-weight constructions
نویسندگان
چکیده
Experiments have been performed to study the active reduction of sound transmission through single and double gypsum board constructions. The active control scheme was based on the feedforward and feedback control strategies. The ElectroMechanical Film flat panel actuators were tested. These actuators attached to the radiating surface of the lightweight partition can significantly reduce the sound transmission. The active systems achieves 2-9 dB reduction of the average sound intensity level over the controlled surface of the radiating wall for random noise excitation in the frequency range from 100 to 400 Hz.
منابع مشابه
Light Transmission through Three Types of Translucent Zirconia
Objective: Zirconia cores have limited light transmittance and data are scarce on light transmission through zirconia cores with and without the veneering ceramic. Methods: In this in vitro study, Disc-shaped specimens (11.5 mm in diameter and 0.4 (0.05) mm in thickness) were fabricated of three types of zirconia namely Mamut, Heany and ZirkonZahn (n=5). A disc-shaped specimen (11.5 mm in d...
متن کاملمقایسه افت انتقال صوت در نانوکامپوزیت اکسید روی در دو حالت معمولی و پوشیده با ژلاتین
Introduction: The aim of the present study was preparing polymeric materials and nanocomposites based on nanoparticles of zinc oxide in normal cases the coated with gelatin and comparing them in terms of sound transmission loss in different frequencies. Method: This study was an experimental one. The materials used in the current study were included zinc oxide nanoparticles, polymer po...
متن کاملActive reduction of sound transmission through double panel partitions - A physical analysis of the observed phenomena
The paper addresses the active control of the sound transmission through a double panel partition. A literature survey indicates that active cavity control is much more efficient than active structural control. The vibro-acoustic behaviour of the double wall is analysed in light of this observation. This analysis shows that the sound transmission through the double panel is larger than that thr...
متن کاملOptimization of Sound Transmission Loss of a Composite Rectangular Plate with Infinite Baffle
In this paper, optimization of the sound transmission loss of finite rectangular anisotropic laminated composite plate with simply supported boundary conditions has been developed to maximize transmission loss. Appropriate constraints were imposed to prevent the occurrence of softening effect due to optimization. For this purpose, optimization process was incorporated into comprehensive finite ...
متن کاملEffects of Chronic Contact with Low Levels of Lead Acetate on Learning in Active Mice Avoidance Conditional Approach
Introduction: Lead (Pb) is a major pollutant in the environment, which, upon long exposure, can impose a broad range of abnormalities in the structure and function of the brain, especially in the infant. Despite the efforts made in the behavioral effects of lead on the results, there are contradictions and conflicts. In this study, we assessed the effect of chronic exposure to low levels of lea...
متن کامل