Modification of the Diffracted Sound Field by Some Noise Barrier Edge Designs

In the frame of the SOPRANOISE project (funded by CEDR in the Transnational Road Research Programme 2018) work package 2 focused first on providing theoretical and practical background information on measurement of the acoustic performance of noise barriers due to a state-of-the-art regarding correlations and possible trends between diffuse (EN 1793-1, EN 1793-2) and direct sound field methods (EN 1793-5, EN 1793-6). After that, the objective of this research was to extend and update the database of the European noise barrier market developed during the QUIESST project, including more detailed analyses on single-number ratings as well as third-octave band measurement results. The data collected and the analysis performed show relevant facts and figures about acoustic performances of noise barriers measured under diffuse and direct sound field conditions, together with a better understanding of the respective significance, similarities and differences of these standardized methods, improving data analysis and correlations between these methods. This paper gives a general overview of the data collected, summarising the main results of the statistical analyses performed. Overall results and comparisons between results of measurements performed under diffuse and under direct sound field conditions are shown. Finally, conclusions and possible outlook of the research are presented.

Download Full-text

Calculation and Analysis on Noise Barrier Source Sound Field Monitoring of High-speed Railway

DEStech Transactions on Materials Science and Engineering ◽

10.12783/dtmse/amsee2017/14289 ◽

2017 ◽

Author(s):

Jun GAO ◽

Xiao LIN ◽

Chen ZHANG

Keyword(s):

High Speed ◽

Sound Field ◽

Field Monitoring ◽

High Speed Railway ◽

Noise Barrier

Download Full-text

Decay of Temporary Threshold Shift in Noise

Journal of Speech and Hearing Research ◽

10.1044/jshr.1602.267 ◽

1973 ◽

Vol 16 (2) ◽

pp. 267-270 ◽

Cited By ~ 5

Author(s):

John H. Mills ◽

Seija A. Talo ◽

Gloria S. Gordon

Keyword(s):

Sound Field ◽

Threshold Shift ◽

Temporary Threshold Shift ◽

Octave Band ◽

Band Noise ◽

Lower Asymptote

Groups of monaural chinchillas trained in behavioral audiometry were exposed in a diffuse sound field to an octave-band noise centered at 4.0 k Hz. The growth of temporary threshold shift (TTS) at 5.7 k Hz from zero to an asymptote (TTS ∞ ) required about 24 hours, and the growth of TTS at 5.7 k Hz from an asymptote to a higher asymptote, about 12–24 hours. TTS ∞ can be described by the equation TTS ∞ = 1.6(SPL-A) where A = 47. These results are consistent with those previously reported in this journal by Carder and Miller and Mills and Talo. Whereas the decay of TTS ∞ to zero required about three days, the decay of TTS ∞ to a lower TTS ∞ required about three to seven days. The decay of TTS ∞ in noise, therefore, appears to require slightly more time than the decay of TTS ∞ in the quiet. However, for a given level of noise, the magnitude of TTS ∞ is the same regardless of whether the TTS asymptote is approached from zero, from a lower asymptote, or from a higher asymptote.

Download Full-text

Modified Earpieces and CROS for High Frequency Hearing Losses

Journal of Speech and Hearing Research ◽

10.1044/jshr.1101.204 ◽

1968 ◽

Vol 11 (1) ◽

pp. 204-218 ◽

Cited By ~ 9

Author(s):

Elizabeth Dodds ◽

Earl Harford

Keyword(s):

Hearing Loss ◽

Hearing Aids ◽

High Frequency ◽

Hearing Aid ◽

Sound Field ◽

Intensity Level ◽

Test Results ◽

High Frequency Hearing Loss ◽

Increased Sensitivity ◽

Difficult Cases

Persons with a high frequency hearing loss are difficult cases for whom to find suitable amplification. We have experienced some success with this problem in our Hearing Clinics using a specially designed earmold with a hearing aid. Thirty-five cases with high frequency hearing losses were selected from our clinical files for analysis of test results using standard, vented, and open earpieces. A statistical analysis of test results revealed that PB scores in sound field, using an average conversational intensity level (70 dB SPL), were enhanced when utilizing any one of the three earmolds. This result was due undoubtedly to increased sensitivity provided by the hearing aid. Only the open earmold used with a CROS hearing aid resulted in a significant improvement in discrimination when compared with the group’s unaided PB score under earphones or when comparing inter-earmold scores. These findings suggest that the inclusion of the open earmold with a CROS aid in the audiologist’s armamentarium should increase his flexibility in selecting hearing aids for persons with a high frequency hearing loss.

Download Full-text

Sound Field Measurement Tutorial

10.1044/policy.rp1991-00025 ◽

1991 ◽

Author(s):

Keyword(s):

Field Measurement ◽

Sound Field

Download Full-text

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

EKONOMI BISNIS ◽

10.33592/jeb.v25i2.427 ◽

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.

Download Full-text