Characterization of free field radiation in brass instrument horns under swept sine excitation using a linear microphone array

2017 ◽  
Vol 141 (5) ◽  
pp. 3723-3723
Author(s):  
Amaya López-Carromero ◽  
Jonathan A. Kemp ◽  
D. Murray Campbell
Keyword(s):  
Microphone Array ◽  
Free Field ◽  
Field Radiation

CHARACTERIZATION OF LIQUEFACTION RESISTANCE OF SAND: EFFECT OF INITIAL FABRIC

2014 ◽  
Vol 08 (01) ◽  
pp. 1450001 ◽  
Author(s):  
BO LI ◽  
XIANGWU ZENG ◽  
HAO YU
Keyword(s):  
Depositional Environment ◽  
Design Method ◽  
Free Field ◽  
Recent Experience ◽  
Permeability Test ◽  
Fabric Anisotropy ◽  
Liquefaction Resistance ◽  
Liquefaction Potential ◽  
Centrifuge Tests

The micro-fabric of deposition reflects the imprints of its geologic and stress history, its depositional environment, and its weathering history. Recent experience shows that the fabric anisotropy does influence the static and dynamic behavior of granular materials. In this study, a series of centrifuge tests are conducted to investigate the effects of fabric anisotropy on the dynamic response in the free field. The results show the acceleration, pore pressure, and residual settlement is significantly affected by the fabric anisotropy of the ground, which shows the liquefaction resistance of the ground. Meanwhile, the response of acceleration is analyzed in frequency domain, which shows that the model prepared by 90° absorbs more energy than that of 0°. To verify the effects induced by the initial fabric, permeability test are conducted and related to the liquefaction potential. The results indicate the fabric anisotropy should be incorporated into the design method.

Reconstruction of the free-field radiation from a vibrating structure based on measurements in a noisy environment

2013 ◽  
Vol 134 (4) ◽  
pp. 2823-2832 ◽  
Author(s):  
Chuan-Xing Bi ◽  
Ding-Yu Hu ◽  
Yong-Bin Zhang ◽  
J. Stuart Bolton
Keyword(s):  
Free Field ◽  
Noisy Environment ◽  
Field Radiation

scholarly journals STABLE MATCHED LAYER FOR THE ACOUSTIC CONSERVATION EQUATIONS IN THE TIME DOMAIN

2012 ◽  
Vol 20 (01) ◽  
pp. 1250004 ◽  
Author(s):  
ANDREAS HÜPPE ◽  
MANFRED KALTENBACHER
Keyword(s):  
Time Domain ◽  
Free Field ◽  
Auxiliary Variables ◽  
Weak Stability ◽  
Absorption Properties ◽  
Conservation Equations ◽  
Convolution Integrals ◽  
Field Radiation ◽  
The Time Domain ◽  
Radiation Conditions

In recent years the development of free field radiation conditions in the time domain has become a topic of intensive research. Perfectly matched layer (PML) approaches for the frequency domain are well known. In the time domain, on the other hand, they suffer in many cases from highly increased complexity and instabilities. In this paper, we introduce a PML for the conservation equations of linear acoustics. The used formulation requires three auxiliary variables in 3D and circumvents thereby convolution integrals and higher order time derivatives. Furthermore, we prove the weak stability of the proposed formulation and show their good absorption properties by means of numerical examples.

scholarly journals Engineering characterization of ground motion. Task I. Effects of characteristics of free-field motion on structural response

1984 ◽  
Author(s):  
R.P. Kennedy ◽  
S.A. Short ◽  
K.L. Merz ◽  
F.J. Tokarz ◽  
I.M. Idriss ◽  
...  
Keyword(s):  
Ground Motion ◽  
Free Field ◽  
Structural Response

A Comparison of Frequency-Domain Microphone Array Methods for the Characterization of Rotating Broadband Noise Sources

2019 ◽  
Vol 105 (1) ◽  
pp. 66-74 ◽  
Author(s):  
Christof Ocker ◽  
Gert Herold ◽  
Florian Krömer ◽  
Wolfram Pannert ◽  
Ennes Sarradj ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Microphone Array ◽  
Broadband Noise ◽  
Noise Sources

A two-zone sound field reproduction based on the region energy control

2021 ◽  
Vol 263 (6) ◽  
pp. 348-354
Author(s):  
Bokai Du ◽  
Xiangyang Zeng ◽  
Haitao Wang
Keyword(s):  
Control Method ◽  
Microphone Array ◽  
Free Field ◽  
Sound Field ◽  
Field Energy ◽  
Reproduction System ◽  
Physical Isolation ◽  
Multipoint Method ◽  
Reverberant Environment ◽  
Measurement Effort

Multizone sound field reproduction aims to create different acoustical environments in regions without physical isolation. For a real reproduction system, it is always expected to improve system performance and reduce measurement effort. In this paper, a two-zone sound field reproduction is investigated with a proposed region control method. Conventional multipoint method only controls sound field at limited number of measurement points. However, the proposed method tries to control the sound field energy over the whole region. Considering the system's diverse work environment, different interpolation methods are applied in the proposed method. Simulations are conducted under free field and reverberation condition in order to deeply compare with conventional method and another harmonic domain method. Simulation results show that the proposed method achieves better performance than the conventional multipoint method in free field and reverberant environment. On the other hand, the region control method proposed in this paper is free from microphone array geometry requirement, which means the method is more convenient for the practical application.

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