Noise Reduction in a Rectangular Enclosure Using Active Wave Control(Mechanical Systems)

Active noise reduction of a coupled rectangular cavity using active wave control

ABSTRACT The objective of this study is to generate a quiet space in a coupled rectangular cavity by suppressing a travelling wave caused by vibration of a flexible panel. Firstly, this study begins with description of an enclosed sound field from a wave point of view by introducing a one-dimensional transfer matrix method for three-dimensional space. Next, a concept of modal coupling method is...

Cooling a hot obstacle in a rectangular enclosure by using a MHD nanofluid with variable properties

In this study, cooling of a hot obstacle in a rectangular cavity filled with water-CuO nanolfuid has been examined numerically. This cavity has an inlet and outlet and the cold nanofuid comes from the left side of the cavity and after cooling the hot obstacle, it goes out from the opposite site. All of the walls are insulated, and the SIMPLER algorithm has been employed for solving the governin...

Single-channel noise reduction using optimal rectangular filtering matrices.

This paper studies the problem of single-channel noise reduction in the time domain and presents a block-based approach where a vector of the desired speech signal is recovered by filtering a frame of the noisy signal with a rectangular filtering matrix. With this formulation, the noise reduction problem becomes one of estimating an optimal filtering matrix. To achieve such estimation, a method...

Sound equalization in a large region of a rectangular enclosure.

Noise reduction in gravitational wave interferometers using feedback

We show that the quantum locking scheme recently proposed by Courty et al. [Phys. Rev. Lett. 90, 083601 (2003)] for the reduction of back action noise is able to significantly improve the sensitivity of the next generation of gravitational wave interferometers. PACS numbers: 42.50.Lc, 04.80.Nn, 03.65.Ta