The analytical model of rheological fluid for vibration and noise control

2013 ◽  
Author(s):  
Marek Szary
Keyword(s):  
Analytical Model ◽  
Noise Control

scholarly journals An Evaluation of Active Noise Control in a Cylindrical Shell

1989 ◽  
Vol 111 (3) ◽  
pp. 337-342 ◽  
Author(s):  
R. J. Silcox ◽  
H. C. Lester ◽  
S. B. Abler
Keyword(s):  
Cylindrical Shell ◽  
Analytical Model ◽  
Noise Control ◽  
Active Noise Control ◽  
Effective Control ◽  
Elastic Cylindrical Shell ◽  
Noise Sources ◽  
Active Noise ◽  
Fixed Array ◽  
Forced Responses

This paper examines the physical mechanisms governing the use of active noise control in an extended volume of a cylindrical shell. Measured data were compared with computed results from a previously derived analytical model based on infinite shell theory. For both the analytical model and experiment, the radiation of external monopoles is coupled to the internal acoustic field through the radial displacement of the thin, elastic, cylindrical shell. An active noise control system was implemented inside the cylinder using a fixed array of discrete monopole sources, all of which lie in the plane of the exterior noise sources. Good agreement between measurement and prediction was obtained for both internal pressure response and overall noise reduction. Attenuations in the source plane greater than 15 dB were recorded along with a uniformly quieted noise environment over an indicative length inside the experimental model. Results indicate that for forced responses with extended axial distributions, axial arrays of control sources may be required. Finally, the Nyquist criteria for the number of azimuthal control sources is shown to provide for effective control over the full cylinder cross section.

Preliminary Investigation on the Perforated Panel Mobility Using Finite Element Method

2013 ◽  
Vol 471 ◽  
pp. 341-346
Author(s):  
Azma Putra ◽  
A. Rivai ◽  
Wai C. Mun ◽  
Noryani Muhammad
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Analytical Model ◽  
Noise Control ◽  
Preliminary Investigation ◽  
Sound Radiation ◽  
Control Measures ◽  
Hole Size ◽  
Panel Stiffness ◽  
Element Method

Introduction of holes into plat-like structures is commonly found as one of practical noise control measures to reduce sound radiation. However, perforation into the panel also reduces the panel stiffness and hence increases its vibration. Since the discussion and also the analytical model to quantify this effect are lacking, this paper discusses the dynamics of a perforated panel from the results obtained using Finite Element Method (FEM). Different hole geometries are simulated to investigate their effect on the plate mobility. It is found that increasing the perforation ratio increases the plate mobility particularly at off-resonance peaks. The effect of hole size and number are also discussed in this report.

scholarly journals Investigation on a Duct Noise Control Method through Membranes in Tandem

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Cheng Shen ◽  
Shasha Yang ◽  
Harris K. H. Fan ◽  
Randolph C. K. Leung
Keyword(s):  
Analytical Model ◽  
Practical Problem ◽  
Passive Control ◽  
Noise Control ◽  
Control Method ◽  
Coupling Effect ◽  
System Response ◽  
Simplified Models ◽  
Aeroacoustic Simulation

Duct noise control is an important practical problem. This paper explores the vibro-acoustic mechanism of duct noise through the membrane in tandem. Validity and feasibility of the proposed analytical model is demonstrated by comparing existing simplified models and full direct aeroacoustic simulation solved with the CE/SE model. It is shown that the coupling effect between two membranes in tandem is not negligible to predict system response. Moreover, introduction of multimembranes is important or even the only efficient way to apply this passive control method in practice.

Noise control

1975 ◽  
Vol 54 (9) ◽  
pp. 458
Keyword(s):  
Noise Control
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