Active reduction of sound transmission through double panel partitions - A physical analysis of the observed phenomena
نویسنده
چکیده
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 through a single panel at the resonances of the coupled eigenmodes with the strongest vibro-acoustic coupling between the plate motion and the pressure in the cavity. At frequencies where the double panel radiates much sound energy, the acoustic energy in the cavity is also high. Active control simulations illustrate that the cavity control approach, reducing not only the uncoupled (0,0,0) mode, achieves a considerable reduction of the sound transmission over a large frequency band. Both symmetrical and asymmetrical double panel systems are considered.
منابع مشابه
Active sound transmission control of a double-panel module using decoupled analog feedback control: experimental results.
Low-frequency sound transmission through passive lightweight partitions often renders them ineffective as means of sound isolation. As a result, researchers have investigated actively controlled lightweight partitions in an effort to remedy this problem. One promising approach involves active segmented partitions (ASPs), in which partitions are segmented into several distinctly controlled modul...
متن کاملA double-panel active segmented partition module using decoupled analog feedback controllers: numerical model.
Low-frequency sound transmission has long plagued the sound isolation performance of lightweight partitions. Over the past 2 decades, researchers have investigated actively controlled structures to prevent sound transmission from a source space into a receiving space. An approach using active segmented partitions (ASPs) seeks to improve low-frequency sound isolation capabilities. An ASP is a pa...
متن کاملFifth International Congress on Sound and Vibration Strategies for Active Control of Sound Transmitted through a Double-panel Partition Using Distributed Actuators and Sensors
The paper considers the active control of harmonic and random sound transmitted through a double-leaf partition using a single distributed actuator and a single distributed sensor. The double-leaf partition consists of a pair of small plates (300x380 mm, separated by a 100 mm air-gap,). An actuator made up of shaped, distributed PVDF offers the possibility of cent rolling the volume velocity of...
متن کاملExperiments on the active reduction of sound transmission through light-weight constructions
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 so...
متن کاملActive Sound Transmission Control of an Experimental Double-panel Partition Using Decoupled Analog Feedback Control
This paper addresses the construction, measurement, and analysis of a double panel active partition (DPAP) and its accompanying analog feedback controllers. The DPAP was constructed by attaching an aluminum cone loudspeaker at each end of a short segment of a circular duct. Two analog feedback controllers were designed and built using the measured frequency response function of each panel. Two ...
متن کامل