scholarly journals Active control of sound with a one-dimensional secondary source array.

1996 ◽  
Vol 17 (6) ◽  
pp. 325-326
Author(s):  
Masaki Hasebe
Keyword(s):  
Active Control ◽  
Secondary Source ◽  
One Dimensional ◽  
Source Array

Far-Field Performances Prediction of High Frequency Projectors Using Secondary Source Array Method

2016 ◽  
Vol 25 (02) ◽  
pp. 1750002 ◽  
Author(s):  
Shiquan Wang
Keyword(s):  
High Frequency ◽  
Near Field ◽  
Directivity Pattern ◽  
Field Method ◽  
Voltage Response ◽  
Secondary Source ◽  
Far Field ◽  
Comparison Of The Results ◽  
Source Array ◽  
Good Agreement

This paper investigates the prediction of the far-field performances of high frequency projectors using the second source array method (SSAM). The far-field parameters can be calculated accurately using the complex acoustic pressure data of two very close parallel planes which lie in the near-field region of the projector. The paper simulates the feasibility of predicting the far-field parameters such as transmitting voltage response and the far-field directivity pattern. The predicting results are compared with that calculated using boundary element method (BEM). It shows very good agreement between the two methods. A planar high frequency projector is measured using the near-field method. In order to verify the predicting results, the far-field measurement is performed for the same projector. The comparison of the results shows that the near-field method is capable to precisely predict the far-field parameters of the projector.

Active control of energy density in a one-dimensional waveguide: A cautionary note (L)

2005 ◽  
Vol 117 (6) ◽  
pp. 3377-3380 ◽  
Author(s):  
Ben S. Cazzolato ◽  
Dick Petersen ◽  
Carl Q. Howard ◽  
Anthony C. Zander
Keyword(s):  
Energy Density ◽  
Active Control ◽  
Cautionary Note ◽  
One Dimensional

Numerical Study of the Implementation of an Active Control Turbocharger on Automotive Diesel Engines

2013 ◽  
Vol 135 (5) ◽  
Author(s):  
J. Galindo ◽  
V. Dolz ◽  
A. Tiseira ◽  
R. Gozalbo
Keyword(s):  
Active Control ◽  
Numerical Study ◽  
Operating Point ◽  
Variable Geometry ◽  
One Dimensional ◽  
Engine Efficiency ◽  
Gas Dynamic ◽  
Operating Points ◽  
Engine Operating Point ◽  
Average Position

Active control turbocharger (ACT) has been proposed as a way to improve turbocharger performance under highly pulsating exhaust flows. This technique implies that the variable geometry mechanism in the turbine is used to optimize its position as a function of the instantaneous mass flow during the engine cycle. Tests presented in the literature showed promising results in a pulsating gas-stand. In this work, a modeling study has been conducted at different engine conditions aimed to quantify the gain in on-engine conditions and to develop a strategy to integrate the ACT system within the engine. Different ways of changing the displacement of the variable mechanism have been analyzed by means of a one-dimensional gas dynamic model. The simulations have been carried out at constant engine operating points defined by fixed air-to-fuel ratio for different mechanism displacement functions around an average position that guarantees the desired amount of intake air. The benefits in overall engine efficiency are lower to those predicted in the literature. It can be concluded that it is not possible to use the ACT system to optimize the turbine operating point and at the same time to control the engine operating point.

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