An analysis of the low frequency sound field in non‐rectangular enclosures using the finite element method

1984 ◽  
Vol 75 (2) ◽  
pp. 637-637
Author(s):  
Earl R. Geddes
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Low Frequency ◽  
Sound Field ◽  
The Finite Element Method ◽  
Frequency Sound ◽  
Element Method

SCALED BOUNDARY FINITE ELEMENT METHOD FOR ACOUSTICS

2006 ◽  
Vol 14 (04) ◽  
pp. 489-506 ◽  
Author(s):  
L. LEHMANN ◽  
S. LANGER ◽  
D. CLASEN
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Elements ◽  
Sound Propagation ◽  
Sound Field ◽  
Radiation Condition ◽  
The Finite Element Method ◽  
Scaled Boundary Finite Element ◽  
Element Method

When studying unbounded wave propagation phenomena, the Sommerfeld radiation condition has to be fulfilled. The artificial boundary of a domain discretized using standard finite elements produces errors. It reflects spurious energy back into the domain. The scaled boundary finite element method (SBFEM) overcomes this problem. It unites the concept of geometric similarity with the standard approach of finite elements assembly. Here, the SBFEM for acoustical problems and its coupling with the finite element method for an elastic structure is presented. The achieved numerical algorithm is best suited to study the sound propagation in an unbounded domain or interaction phenomena of a vibrating structure and an unbounded acoustical domain. The SBFEM is applied to study the sound transmission through a separating component, and for the determination of the sound field around a sound insulating wall. The results are compared with a hybrid algorithm of Finite and Boundary Elements or with the Boundary Element Method, respectively.

Low Frequency Analysis of the Tracheo-Bronchia

2002 ◽  
Author(s):  
A. M. Al-Jumaily ◽  
N. Mago
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Frequency Analysis ◽  
Respiratory System ◽  
Future Development ◽  
Natural Frequencies ◽  
Low Frequency ◽  
Mode Shapes ◽  
The Finite Element Method ◽  
Element Method

Theoretical natural frequencies and mode shapes for the tracheo-bronchia of the human respiratory system are determined using the finite element method. Radial modes, which are anticipated to be used for contraction relaxation, are identified. It is anticipated that these values will give the initiation for future development of non-traditional techniques of relieving respiratory system constrictions.

Study on Aseismic Behavior of Shear Wall with Frame Column in the Large Thermal Power Plant

2012 ◽  
Vol 446-449 ◽  
pp. 621-625
Author(s):  
Zhao Wu Shen ◽  
She Liang Wang ◽  
Xiang Zhao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Power Plant ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Low Frequency ◽  
Shear Wall ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Element Method

In order to analyze aseismic behavior of the high reinforced concrete (R.C.) shear wall with frame column in the large thermal power plant, the model structure has been taken test with method of low frequency cyclic repeated load that has 1/15 scaling factor to practical structure. At same time the model has been analyzed by the finite element method which takes the Hognestad concrete constitutive model and ideal elastic-plasticity steel reinforcement constitutive equation. It has been found that the hysteretic curve is relatively full and energy dissipation capacity is better through the experiment. The bearing capacity, deformation and fracture results to the Shear wall of finite element analysis are closely with the test results. In general, the R.C. shear wall with frame column in the large thermal power plant has good aseismic performance. The finite element method can be taken to analyzed the similarity structure.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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