scholarly journals A comparative study of the physical mechanisms related to highway noise barrier insertion loss : measurements versus modeling assumptions.

2005 ◽  
Author(s):  
Ning Shu
Keyword(s):  
Comparative Study ◽  
Insertion Loss ◽  
Physical Mechanisms ◽  
Noise Barrier ◽  
Highway Noise

Variability of highway noise barrier insertion loss in the atmosphere

1998 ◽  
Vol 104 (3) ◽  
pp. 1750-1750
Author(s):  
Scott D. Hansen ◽  
Courtney B. Burroughs
Keyword(s):  
Insertion Loss ◽  
Noise Barrier ◽  
Highway Noise

scholarly journals Performance Comparison Of Shunt Rf Mems Switches

2021 ◽  
Vol 12 (5) ◽  
pp. 596-606
Author(s):  
S Girish Gandhi, I Govardhani, M Venkata Narayana, K Sarat Kumar
Keyword(s):  
Comparative Study ◽  
Insertion Loss ◽  
Return Loss ◽  
Rf Mems ◽  
Switching Time ◽  
Performance Comparison ◽  
Mems Switches ◽  
Mems Switch ◽  
Rf Mems Switches ◽  
And Performance

This is an attempt to compare three different shunt configured RF MEMS switches which offers a choice for applications in satellite and antennas. Advanced RF communication domain demands for design and modeling of RF MEMS switch which provides extremely reduced pull-in voltage, better isolation, low insertion loss, and with greater reliability. The proposed work manages with comparison of design modeling and performance of three different shunt configured RF MEMS switches. The proposed shunt configured RF MEMS switches are designed with different dimensions with different meandering techniques with perforations on beam structure helps in reducing the amount of voltage required for actuation of switch which is known as pull-in voltage. Comparative study of three different RF MEMS switches which involves in conducting electromechanical analysis are carried out using COMSOL multi physics tool and electromagnetic analysis are carried out using HFSS tool. Moreover the comparative study involves in comparing the values of pull-in voltage, switching time and capacitance, stress, insertion loss, return loss and isolation of three different RF MEMS switches. Proposed first switch model derives pull-in voltage of 16.9v with the switching time of 1.2µs, isolation of 47.70 dB at 5GHz and insertion loss of 0.0865 dB and return loss of 41.55 dB. Proposed second switch model derives pull-in voltage of 18.5v with the switching time of 2.5µs, isolation of 37.20 dB at 8GHz and insertion loss of 0.1177 dB and return loss of 38.60 dB. Proposed third switch model delivers pull-in voltage of 18.75v with the switching time of 2.56µs, isolation of 44.1552 dB at 8GHz and insertion loss of 0.0985 dB and return loss of 42.1004 dB.

Meteorological influence on highway noise barrier performance: A case study.

2010 ◽  
Vol 127 (3) ◽  
pp. 1797-1797
Author(s):  
Paul Burgé ◽  
Jon Sytsma ◽  
Tom Zurburg
Keyword(s):  
Barrier Performance ◽  
Noise Barrier ◽  
Highway Noise

NOISE SHIELDING BY SIMPLE BARRIERS: COMPARISON BETWEEN THE PERFORMANCE OF SPHERICAL AND LINE SOUND SOURCES

2000 ◽  
Vol 08 (03) ◽  
pp. 495-502 ◽  
Author(s):  
D. OUIS
Keyword(s):  
Sound Source ◽  
Insertion Loss ◽  
Line Source ◽  
Wave Reflection ◽  
Noise Source ◽  
Sound Level ◽  
Sound Sources ◽  
Noise Shielding ◽  
Noise Barrier ◽  
Wave Incidence

This study is concerned with the theoretical solution to the problem of sound screening by simple hard barriers on the ground with special emphasis given to the type of wave incidence, namely a comparison between the use of either a spherical or a cylindrical sound source. For a receiver at the shadow of the noise source, the field may be assumed to be due to the edge wave and for this, exact solutions are used. Regarding the wave reflection on an impedance ground, exact formulations are also used, and finally, some calculations are made on the performance of a hard noise barrier on a two-impedance ground. As a conclusion, it is found that although the sound level at the receiver may show some small differences depending on the frequency and on the geometry of the problem, the overall insertion loss of the thin hard barrier is almost the same for the spherical and the line source, and the differences are found to amount to less than 1 dB for geometries of practical occurrence.

scholarly journals STUDY ON EFFECTIVE NOISE BARRIER AT SENIOR HIGH SCHOOL (SMAN 02) CIBINONG

2019 ◽  
Vol 2 (2) ◽  
pp. 181
Author(s):  
Aulia Ramandha ◽  
Wisnu Eka Yulyanto ◽  
Sandra Madonna
Keyword(s):  
High School ◽  
Insertion Loss ◽  
Noise Level ◽  
Road Traffic ◽  
Traffic Noise ◽  
Road Traffic Noise ◽  
Type Ii ◽  
Noise Barrier ◽  
Barrier Type ◽  
The Difference

<strong>Aim:</strong> The aim of this study is to design noise barrier shapes and to investigate its effectiveness in reducing traffic noise at one public school in Indonesia. <strong>Methodology and Results:</strong> Two types of barriers were designed on a laboratory scale using plywood materials and the noise level was measured using Noise Analyzer Briiel and Kjaer Type 2250. Noise reduction was analyzed by using the Insertion Loss method based on the difference of the noise level before and after implementing the barrier. The results show that the barrier Type II with a length of 200 cm, a receiver height of 30 cm, and a curved shape of 45° angle (Type L) is more effective in reducing the noise than the other variation of barrier shape and length. Barrier Type L (Type II) can reduce the noise at high frequency between 1–8 kHz with an Insertion Loss value of 6.9–27.9 dB. <strong>Conclusion, significance and impact study:</strong> The noise barrier Type II, with specifications of 20 m length, 3 m height, and barrier material of reinforced concrete, is recommended to be used at the high school to reduce the road traffic noise.

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