ACTIVE STRUCTURE ACOUSTIC CONTROL WITHIN IRREGULAR ENCLOSURE BASED ON ANALYTICAL METHOD

2006 ◽  
Vol 42 (supp) ◽  
pp. 39
Author(s):  
Su ZHANG
Keyword(s):  
Analytical Method ◽  
Active Structure ◽  
Acoustic Control ◽  
Irregular Enclosure

New Analytical Method for Modeling Active Structure Acoustic Control System within an Irregular Enclosure

2005 ◽  
Vol 24 (4) ◽  
pp. 265-273 ◽  
Author(s):  
Su Zhang ◽  
Nan Chen
Keyword(s):  
Control System ◽  
Analytical Method ◽  
Control Problems ◽  
Coupled Problems ◽  
Sound Sources ◽  
Acoustic Structure ◽  
Active Structure ◽  
Coupled Problem ◽  
Acoustic Control ◽  
Irregular Enclosure

A new analytical method for the acoustic-structure coupled problem within an irregular enclosure, which has both inner sound sources, and exterior forces exciting it, was developed based on a method called the covering domain method. The method is not only more accurate and faster than numerical methods, such as FEM/BEM, but also can be used to solve acoustic-structure coupled problems within any irregular enclosure in a convenient way, that are impossible for the traditional analytical method. The model for, the active structure acoustic control (ASAC) system of an irregular enclosure based on the method above was founded, and then the optimized actuators outputs were given, which is the key step for ASAC system design. Then the method was applied to a car-like-cavity and it was found that the simulation result is quite good and shows us this new general analytical method for solving active structure acoustic control problems within an irregular enclosure considering acoustic-structure coupling to be quite effective and fit for any irregular enclosure.

Robust μ-Synthesis Control for Parameter Variations

2012 ◽  
Vol 546-547 ◽  
pp. 850-855
Author(s):  
Ying Li ◽  
Xue Gong Ding
Keyword(s):  
Robust Stability ◽  
Disturbance Rejection ◽  
Main Idea ◽  
Robust Performance ◽  
Active Structure ◽  
Augmented System ◽  
Synthesis Design ◽  
Acoustic Control ◽  
Parameter Variations ◽  
Performance Problem

The robust ASAC(active structure acoustic control) model for the system of structural acoustical coupling is established and the μ-synthesis design is presented in the paper. The main idea is as follows: First, the robust performance problem of this system is transformed into the robust stability problem of an augmented system. Through the robust stability controller for this augmented system is solved by the standard D-K iteration. Simulation results show that μ-controller can provide good disturbance rejection and is more robust to parameter variations.

Enclosure Active Structure Acoustic Control Based on Multi-Agent System

2012 ◽  
Vol 605-607 ◽  
pp. 1142-1148
Author(s):  
Zhi Chen Li ◽  
Lin Ning Gu ◽  
Nan Chen
Keyword(s):  
Noise Reduction ◽  
Noise Control ◽  
Divide And Conquer ◽  
Flexible Plate ◽  
Multi Agent System ◽  
Control Field ◽  
Agent System ◽  
Active Structure ◽  
Acoustic Control ◽  
Multi Agent

For enclosure noise reduction, limited discrete distributed control is an ideal choice when it is difficult to understand sound-structure coupling characteristics accurately. An enclosure medel of two flexible plates is established in this paper. Two secondary control channels are constructed by applying distributed force on flexible plate. In the basis of control problem decomposition a multi-agent system (MAS) structure is established and the coordination relationship between agents is regulated. The simulaition resultes show the Active Structure Acoustic Control based on MAS is effective. The MAS control method improves the extension of noise control system and can be used in “plug-and–play” control field to realize noise reduction. MAS is a better effective tool to realize the divide-and-conquer approach in enclosure noise control field.

A new active structure acoustic control system

2000 ◽  
Vol 107 (5) ◽  
pp. 2853-2853
Author(s):  
Dingguo Zou ◽  
Malcolm J. Crocker
Keyword(s):  
Control System ◽  
Active Structure ◽  
Acoustic Control

Design, synthesis, and application of chelating polymers for separation and determination of trace and toxic metal ions. A green analytical method

2001 ◽  
Vol 73 (1) ◽  
pp. 181-186 ◽  
Author(s):  
Rakesh K. Sharma
Keyword(s):  
Silica Gel ◽  
Analytical Method ◽  
Toxic Metal ◽  
Design Synthesis ◽  
Active Structure ◽  
Separation And Preconcentration ◽  
Molecular Modeling Studies ◽  
Cu Ions ◽  
Chelating Polymers

A green analytical method was developed for separation and preconcentration of trace amounts of copper from aqueous samples using aurin tricarboxylic acid-immobilized silica gel (ATA-SG). This was done by determining chemical speciation and stability constant of Cu-ATA complex. The pH-metric studies indicate strong complexation of Cu with ATA (log bCu2ATA = 19.56). Species distribution curve for Cu-ATA complex indicates almost 100% complexation of copper, with ATA forming Cu2ATA as the predominant species. Considering the selectivity and strong interaction of ATA toward copper, ATA was immobilized on the polymeric matrix of silica gel, and the conditions were optimized for the uptake of copper from the aqueous solutions. The uptake of Cu ions by ATA-SG was studied both by batch and column methods. The method was developed for the estimation of trace amounts of copper in various samples. Molecular modeling studies were also performed on ATA-immobilized silica gel for gaining an insight into the active structure of ATA on the silica surface.

Densitometric Identification of Primitive Erythroblasts After Reaction With Diaminobenzidine

1973 ◽  
Vol 31 ◽  
pp. 328-329
Author(s):  
John A. Trotter
Keyword(s):  
Red Blood Cells ◽  
Analytical Method ◽  
Blood Cells ◽  
Guinea Pigs ◽  
Specific Protein ◽  
Visual Examination ◽  
Hemoglobin Synthesis ◽  
Peroxidatic Activity ◽  
Small Density

Hemoglobin is the specific protein of red blood cells. Those cells in which hemoglobin synthesis is initiated are the earliest cells that can presently be considered to be committed to erythropoiesis. In order to identify such early cells electron microscopically, we have made use of the peroxidatic activity of hemoglobin by reacting the marrow of erythropoietically stimulated guinea pigs with diaminobenzidine (DAB). The reaction product appeared as a diffuse and amorphous electron opacity throughout the cytoplasm of reactive cells. The detection of small density increases of such a diffuse nature required an analytical method more sensitive and reliable than the visual examination of micrographs. A procedure was therefore devised for the evaluation of micrographs (negatives) with a densitometer (Weston Photographic Analyzer).

Bulk standards for low-temperature biological x-ray microanalysis

1984 ◽  
Vol 42 ◽  
pp. 282-283
Author(s):  
P. Echlin ◽  
M. McKoon ◽  
E.S. Taylor ◽  
C.E. Thomas ◽  
K.L. Maloney ◽  
...  
Keyword(s):  
Phase Separation ◽  
Low Temperature ◽  
Analytical Method ◽  
Salt Solutions ◽  
Absolute Concentration ◽  
Cooling Process ◽  
X Ray ◽  
The Absolute ◽  
Analytical Procedures ◽  
Electrical Conductors

Although sections of frozen salt solutions have been used as standards for x-ray microanalysis, such solutions are less useful when analysed in the bulk form. They are poor thermal and electrical conductors and severe phase separation occurs during the cooling process. Following a suggestion by Whitecross et al we have made up a series of salt solutions containing a small amount of graphite to improve the sample conductivity. In addition, we have incorporated a polymer to ensure the formation of microcrystalline ice and a consequent homogenity of salt dispersion within the frozen matrix. The mixtures have been used to standardize the analytical procedures applied to frozen hydrated bulk specimens based on the peak/background analytical method and to measure the absolute concentration of elements in developing roots.

The synephrine content of Shiikuwasha (Citrus depressa HAYATA) fruit: Analytical method and change during fruit growth

Planta Medica ◽  
2008 ◽  
Vol 74 (09) ◽  
Author(s):  
K Miyagi ◽  
T Fujise ◽  
N Koga ◽  
K Wada ◽  
M Yano ◽  
...  
Keyword(s):  
Analytical Method ◽  
Fruit Growth ◽  
Citrus Depressa
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