Models in COMSOL of Attenuation of Sonic Crystal Noise Barrier depend on Different Form

2020 ◽  
Author(s):  
Elitsa Emilova Gieva ◽  
Ivelina Nikolaeva Ruskova
Keyword(s):  
Sonic Crystal ◽  
Noise Barrier

Acoustical Efficiency of a Sonic Crystal Assisted Noise Barrier

2013 ◽  
Vol 99 (3) ◽  
pp. 399-409 ◽  
Author(s):  
F. Koussa ◽  
J. Defrance ◽  
P. Jean ◽  
P. Blanc-Benon
Keyword(s):  
Sonic Crystal ◽  
Noise Barrier

IMPLEMENTASI PROGRAM KEMITRAAN & BINA LINGKUNGAN STUDI KASUS DI PT ANGKASA PURA II (PERSERO) CABANG UTAMA BANDAR UDARA SOEKARNO-HATTA

2020 ◽  
Vol 25 (2) ◽  
pp. 139-148
Author(s):  
Mohamad Hasanuddin
Keyword(s):  
Noise Barrier

PT Angkasa Pura II  (Persero) adalah Perurahaan Badan Usaha Milik Negara ( BUMN) yang mengelola Airport di Indonesia yang menerapkan  program CSRSeperti telah disebutkan dalam peraturan Menteri Badan Usaha Milik Negara bahwa ada dua kegiatan yang harus dilakukan oleh PT Angkasa Pura II (Persero) yaitu Program kemitraan dengan usaha kecil dan menengah dan juga Program Pengembangan masyarakat  atau yang biasa disebut Program kemitraan dan Bina Lingkungan (PKBL)Tujuan dari penelitian ini adalah untuk mengetahui kendala dalam pelaksanaan Program Kemitraan dan Bina Lingkungan di BUMN PT Angkasa Pura II (Persero) dan untuk mengetahui peaksanaan Program Kemitraan dan Bina Lingkungan  Pada Badan Usaha Milik Negara PT Angkasa Pura II (Persero) Kantor  Cabang  Utama Bandara Soekarno-Hatta  yang telah dilaksanakan sesuai dengan UU tentang BUMN  dan peraturan Menteri BUMN Nomor: PER-02 / MBU / 7/2017.Penelitian ini  menggunakan hukum empiris yaitu literatur penelitian yang tersedia, yaitu penelitian data primer. Data yang diperoleh dalam literatur penelitian tersedia dan wawancara sedang diproses dan dianalisis secara kualitatif normatif makna analisis data berdasarkan apa yang diperoleh dari literatur yang tersedia dan wawancara kemudian diarahkan, dibahas dan diberi penjelasan dengan ketentuan yang berlaku, dan akhirnya disimpulkan dengan metode induktif, yaitu menarik kesimpulan dari hal ke hal khusus yang umum.Kendala dalam pelaksanaan program kemitraan dan Bina Lingkungan  PT Angkasa Pura II (Persero)  Kantor Cabang Utama  Bandara Soekarno-Hatta sejak didirikan pada tahun 1985 adalah  memiliki masalah klasik yaitu kebisingan bagi masyarakat  sehingga perlu untuk mencoba mengendalikan untuk menguranginya, salah satunya adalah membangun tembok untuk mengurangi (noise barrier) dan memindahkan permukiman yang sangat dekat dengan landasan pacu.

Numerical analysis on the reduction of the inflow of black carbon from a road into an elementary school by a noise barrier

2016 ◽  
Vol 15 (4) ◽  
pp. 329-336 ◽  
Author(s):  
Gihoon Kim ◽  
◽  
Seongmin Jo ◽  
Hohyun Kim ◽  
Seungdo Yu ◽  
...  
Keyword(s):  
Elementary School ◽  
Numerical Analysis ◽  
Black Carbon ◽  
Noise Barrier

Case study: Prediction and field tests of railway noise and effects of a low-height noise barrier

2020 ◽  
Vol 68 (4) ◽  
pp. 303-314
Author(s):  
Yuna Park ◽  
Hyo-In Koh ◽  
University of Science and Technology, Transpo ◽  
University of Science and Technology, Transpo ◽  
University of Science and Technology, Transpo ◽  
...  
Keyword(s):  
High Speed ◽  
Field Tests ◽  
Residential Areas ◽  
Railway Systems ◽  
Railway Noise ◽  
Sound Levels ◽  
Noise Barrier ◽  
The Difference ◽  
Reduction Effect ◽  
The Impact

Railway noise is calculated to predict the impact of new or reconstructed railway tracks on nearby residential areas. The results are used to prepare adequate counter- measures, and the calculation results are directly related to the cost of the action plans. The calculated values were used to produce noise maps for each area of inter- est. The Schall 03 2012 is one of the most frequently used methods for the production of noise maps. The latest version was released in 2012 and uses various input para- meters associated with the latest rail vehicles and track systems in Germany. This version has not been sufficiently used in South Korea, and there is a lack of standard guidelines and a precise manual for Korean railway systems. Thus, it is not clear what input parameters will match specific local cases. This study investigates the modeling procedure for Korean railway systems and the differences between calcu- lated railway sound levels and measured values obtained using the Schall 03 2012 model. Depending on the location of sound receivers, the difference between the cal- culated and measured values was within approximately 4 dB for various train types. In the case of high-speed trains, the value was approximately 7 dB. A noise-reducing measure was also modeled. The noise reduction effect of a low-height noise barrier system was predicted and evaluated for operating railway sites within the frame- work of a national research project in Korea. The comparison of calculated and measured values showed differences within 2.5 dB.

Acoustic meta-silencer: Toward enabling ultrawide-band air-permeable noise barrier

2021 ◽  
pp. 107754632110011
Author(s):  
Mohammad Javad Khodaei ◽  
Amin Mehrvarz ◽  
Reza Ghaffarivardavagh ◽  
Nader Jalili
Keyword(s):  
Heat Transfer ◽  
Design Methodology ◽  
Heat Transfer Performance ◽  
Transmission Loss ◽  
Design Parameters ◽  
Transfer Performance ◽  
Noise Mitigation ◽  
Acoustic Cavity ◽  
Road Map ◽  
Noise Barrier

In this article, we have first presented a metasurface design methodology by coupling the acoustic cavity to the coiled channel. The geometrical design parameters in this structure are subsequently studied both analytically and numerically to identify a road map for silencer design. Next, upon tuning the design parameters, we have introduced an air-permeable noise barrier capable of sound silencing in the ultrawide band of the frequency. It is has been shown that the presented metasurface can achieve +10 dB sound transmission loss from 170 Hz to 1330 Hz (≈3 octaves). Furthermore, we have numerically studied the ventilation and heat transfer performance of the designed metasurface. Enabling noise mitigation by leveraging the proposed metasurface opens up new possibilities ranging from residential and office noise reduction to enabling ultralow noise fan, propellers, and machinery.

An experimental and numerical study of a noise barrier

2007 ◽  
Vol 55 (5) ◽  
pp. 438
Author(s):  
J. W. Trevathan ◽  
J. R. Pearse
Keyword(s):  
Numerical Study ◽  
Noise Barrier

scholarly journals The optimum orientation of an absorbing barrier

2005 ◽  
Vol 461 (2060) ◽  
pp. 2369-2383 ◽  
Author(s):  
A.D Rawlins
Keyword(s):  
Noise Level ◽  
Noise Source ◽  
Shadow Region ◽  
Source Position ◽  
Absorbent Material ◽  
Noise Barrier ◽  
Receiver Point

In the following work, we solve the problem of the best orientation of a rigid noise barrier, which has one face lined with absorbent material, between a noise source and a receiver point in the shadow region of the barrier. By the ‘best orientation’, we mean that positioning of the barrier which yields the least noise level at the receiving point for a given barrier and source position.

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