Environmental Effects on Low Frequency Transmission Loss in the Gulf of Mexico

1980 ◽  
Author(s):  
Burlie A. Brunson ◽  
M. M. Truxillo ◽  
Richard B. Evans
Keyword(s):  
Gulf Of Mexico ◽  
Environmental Effects ◽  
Transmission Loss ◽  
Low Frequency

scholarly journals Low‐frequency propagation across the East Greenland and Frontal Zone: Depth dependence of transmission loss

1987 ◽  
Vol 82 (S1) ◽  
pp. S31-S31
Author(s):  
Leonard E. Mellberg ◽  
D. N. Connors ◽  
D. G. Browning ◽  
G. Botseas ◽  
O. M. Johannessen
Keyword(s):  
Frontal Zone ◽  
Transmission Loss ◽  
Low Frequency ◽  
East Greenland ◽  
Depth Dependence ◽  
Zone Depth

scholarly journals Gulf of Mexico low-frequency ocean soundscape impacted by airguns

2016 ◽  
Vol 140 (1) ◽  
pp. 176-183 ◽  
Author(s):  
Sean M. Wiggins ◽  
Jesse M. Hall ◽  
Bruce J. Thayre ◽  
John A. Hildebrand
Keyword(s):  
Gulf Of Mexico ◽  
Low Frequency

Sound insulation performance of pyramidal truss core sandwich structure with frame

2021 ◽  
pp. 109963622110288
Author(s):  
Yu-Zhou Wang ◽  
Li Ma
Keyword(s):  
Mechanical Properties ◽  
Sandwich Structure ◽  
Transmission Loss ◽  
Low Frequency ◽  
Sound Insulation ◽  
Geometrical Parameters ◽  
Acoustic Performance ◽  
Truss Core ◽  
Pyramidal Truss ◽  
Wave Angle

Recently, sandwich structures have been widely used in different fields because of their good mechanical properties, but these structures are weak in acoustic performance. In this paper, by combining pyramidal truss core sandwich structure with frame, a new structure is proposed with both good mechanical properties and excellent acoustic performance at low frequency. An analytical model of the pyramidal truss core sandwich structure with frame is developed to investigate the sound transmission loss (STL) performance. Finite element method (FEM) is also used to investigate the STL performance at low frequency. The effects of the incident wave angle and the geometrical parameters on the STL of the structure are discussed.

Numerical study for increasement of low frequency sound insulation of double-panel structure using sonic crystals with distributed Helmholtz resonators

2019 ◽  
Vol 33 (14) ◽  
pp. 1950138
Author(s):  
Myong-Jin Kim
Keyword(s):  
Free Space ◽  
Transmission Loss ◽  
Numerical Study ◽  
Low Frequency ◽  
Helmholtz Resonator ◽  
Sound Insulation ◽  
The Finite Element Method ◽  
Helmholtz Resonators ◽  
Sonic Crystal ◽  
Sonic Crystals

Numerical simulations of the sound transmission loss (STL) of a double-panel structure (DPS) with sonic crystal (SC) comprised of distributed local resonators are presented. The Local Resonant Sonic Crystal (LRSC) consists of “C”-shaped Helmholtz resonator columns with different resonant frequencies. The finite element method is used to calculate the STL of such a DPS. First, the STLs of LRSC in free space and the DPS with LRSC are calculated and compared. It is shown that the sound insulations of the local resonators inserted in the double panel are higher than that in free space for the same size of the SCs and the same number of columns. Next, STL of the DPS in which the SC composed of three columns of local resonators having the same outer and inner diameters but different slot widths are calculated, and a reasonable arrangement order is determined. Finally, the soundproofing performances of DPS with distributed LRSC are compared with the case of insertion of general cylindrical SC for SC embedded in glass wool and not. The results show that the sound insulation of the DPS can be significantly improved in the low frequency range while reducing the total mass without increasing the thickness.

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