scholarly journals Comparison of sound level meter calibration for frequency weighting parameter using coupler method

2021 ◽  
Vol 1896 (1) ◽  
pp. 012011
Author(s):  
B Dwisetyo ◽  
D Rusjadi ◽  
M R Palupi ◽  
C C Putri ◽  
F B Utomo ◽  
...  
Keyword(s):  
Sound Level ◽  
Sound Level Meter ◽  
Level Meter ◽  
Frequency Weighting

A discussion on the origin and treatment of noise in industrial environments - Frequency weighting contours for predicting the speech interfering aspects of noise

1968 ◽  
Vol 263 (1142) ◽  
pp. 315-323
Keyword(s):  
Sound Level ◽  
Constant Level ◽  
Sound Level Meter ◽  
Interference Level ◽  
Articulation Index ◽  
Level Meter ◽  
Frequency Weighting ◽  
Speech Interference ◽  
Peak Value ◽  
Noise Spectra

Physical and psychophysical schemes that purported to measure the speech interfering aspects of noise were examined in a series of papers by Klumpp & Webster (1962, 1963) and Webster & Klumpp (1963). Sixteen diverse-spectrum noises were adjusted in level so that listeners hearing monosyllabic (rhyme) words at a constant level of 78 dB from a loudspeaker obtained 50 % word intelligibility scores. Articulation index (a.i) calculations (see Kryter 1962 a ) predicted the speech-interfering properties of the noises very well. However, other, and simpler, schemes worked just as well; for example, speech interference level (s.i.l.) calculations (see Beranek 1954), based on octaves centred at 425, 850 and 1700 Hz, or 500, 1000 and 2000 Hz. The A-weighting and Din 3 networks (see Peterson & Bruel 1957), of a sound level meter (s.l.m.) were good, but the conventional use of noise criteria (n.c.), or alternate noise criteria (n.c.a.) (see Beranek 1957), curves did not work well unless (1) only that part of the curves centering on the octaves 500, 1000 and 2000 Hz was used, and (2) the noise spectra were allowed to ‘average through’ a contour and not just touch it at a peak value.

Infrasonic Time-History Dosimetry

1986 ◽  
Vol 5 (2) ◽  
pp. 60-67
Author(s):  
Daniel L. Johnson
Keyword(s):  
Time History ◽  
Sound Level ◽  
Average Level ◽  
Sound Level Meter ◽  
Preliminary Results ◽  
Exact Time ◽  
Level Meter ◽  
Frequency Weighting

A Model 700 Sound Level Meter/Dosimeter was modified to reflect the proposed frequency weighting curve for infrasound. With this system, the exact time and duration of any infrasound levels that exceed the threshold of hearing are recorded. The average level (Leq) of each event as well as the overall Leq are also provided. In addition a dose, based tentatively on 110 dB at 20 Hz for 8 hours, is also available. Preliminary results from the use of this instrument are presented and discussed.

Testing of Sonic-Absorbent Panels’ Behavior in Open-Air Environment

2012 ◽  
Author(s):  
Petru A. Pop ◽  
Patricia A. Ungur ◽  
Liviu Lazar ◽  
Mircea Gordan ◽  
Florin M. Marcu
Keyword(s):  
High Frequency ◽  
Noise Pollution ◽  
Sound Level ◽  
Sound Level Meter ◽  
Data Logger ◽  
Public Buildings ◽  
Gypsum Plaster ◽  
Level Meter ◽  
And Control

One wildly used method to reduce and control the noise pollution in green city’s buildings is using sonic-absorbent panels. Their applications can be multiple, such as the insulation of buildings, acoustic barriers and fences along the highway or in front of supermarkets, hospitals and other public buildings. This paper presents a method for testing the behavior of sonic-absorbent panels in open-air environment. The work represents a carrying on of previous research about absorbent materials from gypsum family, tested in lab conditions. The experiment setup used a dynamic installation and as a sample a stand formed by six sonic-absorbent panels from special modeling alpha-gypsum plaster. This installation has been composed of two loudspeakers for emitting the sound at a well-defined frequency by the first laptop, the microphone for detecting and transmitting the signal to the second laptop for analyzing and processing the data. All operations were performed using MATLAB Programs, while a Data Logger Sound Level Meter type CENTER 332 was put on near the microphone to compare both results. The first experiment of acoustic stand has been realized by setting up the installation at a frequency from 50 Hz to 1250 Hz and altering the distance between loudspeakers and stand at 0.5m to 1m and 1.5m, respectively. The second experiment kept the same test’s conditions, while two and three layers of sonic-absorbent panels formed the stand, respectively, but at same distance from source of 0.5 m. In both tests, the results underlined the good sonic-absorbent properties of these panels, especially at medium and high frequency, which can recommend using the panels for multiple outside applications.

Pemetaan Dan Perhitungan Pemaparan Tingkat Kebisingan Pada Industri Pengolahan Kayu Di Kecamatan Siak, Provinsi Riau

2021 ◽  
Vol 6 (2) ◽  
pp. 68-76
Author(s):  
Aryo Sasmita ◽  
Muhammad Reza ◽  
Rodesia Mustika Rozi
Keyword(s):  
Sound Level ◽  
Sound Level Meter ◽  
Noise Mapping ◽  
Level Meter

Dalam kegiatan operasionalnya CV. X yang bergerak pada pengolahan kayu, berpotensi menimbulkan kebisingan yang berasal dari mesin-mesin yang digunakan dalam proses produksi pallet. Kebisingan di perusahaan ini dapat berpengaruh terhadap kesehatan dan kenyamanan pekerja. Penelitian ini bertujuan untuk mengetahui intensitas kebisingan yang dihasilkan oleh mesin produksi, lama waktu pemaparan, pemetaan kebisingan dan upaya pengendalian kebisingan. Metode pengukuran kebisingan mengacu pada metode noise mapping dan alat yang digunakan adalah Sound Level Meter. Data yang diperoleh kemudian diolah menjadi peta kontur dengan variasi warna biru, hijau, kuning, ungu dan merah. Hasil penelitian menunjukkan tingkat kebisingan tertinggi sebesar 99,4 dB dan tingkat kebisingan terendah sebesar 67,3 dB. Berdasarkan hasil perhitungan menggunakan persamaan NIOSH dari 128 titik pengukuran metode noise mapping terdapat 38 titik dengan tingkat kebisingan >85 dB yang menunjukkan waktu pemaparan di atas standar yang sudah direkomendasikan NIOSH. Tingkat kebisingan tertinggi sebesar 99,4 dB dengan lama pemaparan selama 0,3 jam dan tingkat kebisingan terendah sebesar 67,3 dB dengan lama pemaparan selama 475 jam. Upaya pengendalian yang dapat dilakukan untuk mengurangi kebisingan seperti pengendalian dari sumber, jalur transmisi, dan penerima.

A Sound Level Meter featured with automatic estimation of the measurement uncertainty

Measurement ◽  
2021 ◽  
pp. 110409
Author(s):  
Marco Carratù ◽  
Consolatina Liguori ◽  
Vincenzo Paciello ◽  
Antonio Pietrosanto ◽  
Domenico Russo ◽  
...  
Keyword(s):  
Measurement Uncertainty ◽  
Sound Level ◽  
Sound Level Meter ◽  
Automatic Estimation ◽  
Level Meter

scholarly journals ANALISIS TINGKAT KEBISINGAN LINGKUNGAN DI KELURAHAN PAHANDUT KECAMATAN PAHANDUT KOTA PALANGKA RAYA KALIMANTAN TENGAH

2019 ◽  
Vol 5 (2) ◽  
Author(s):  
Muh Azhari ◽  
Rudy Yoga Lesmana
Keyword(s):  
Noise Level ◽  
Qualitative Method ◽  
Air Transportation ◽  
Sound Level ◽  
Sound Level Meter ◽  
Google Maps ◽  
Average Value ◽  
The Third ◽  
Level Ii ◽  
Level Meter

Permasalahan lingkungan dari usaha kegiatan manusia untuk memenuhi kebutuhan hidup, seperti sandang, pangan, papan dan transportasi harus dilakukan penanganan dengan baik. Misalnya seperti pengaruh kegiatan transportasi udara terhadap kondisi kualitas lingkungan setempat  seperti kegiatan di Bandara Cilik Riwut Kelurahan Pahandut, Kecamatan Pahandut, Kota Palangka Raya Kalimantan Tengah. Metode penelitian yang digunakan merupakan metode kualitatif dengan analisis data instrumen seperti Sound Level Meter Instrument, Anemometer, GPS, Flight Radar, Google Maps Application & WECPNL Instrument (Weighted Equivalent Continuous Perceived Noise Level)  dan pengambilan data dilakukan selama tiga hari sesuai dengan kedatangan dan keberangkatan pesawat. Hasil penelitian dengan analisis WECPNL menunjukkan bahwa tingkat kebisingan di hari ke 2 lebih besar dibandingkan hari ke 3 dan hari ke 3 lebih besar dari hari ke 1 (87,2  > 82,2 > 75,9) dengan nilai rata-rata WECPNL sebesar 81,7. Kebisingan di bandara Cilik Riwut di Kota Palangka Raya Kalimantan Tengah termasuk kebisingan regional tingkat II dan III. Kegiatan yang dapat dilakukan untuk meminimalisir Risiko kebisingan tersebut yaitu dengan melakukan kegiatan rekayasa keteknikan dan menanam vegetasi yang berfungsi mengurangi kebisingan Kata kunci: Bandara, Kebisingan, Lingkungan. The environmental problems of the efforts of human activities to meet the needs of life, such as clothing, food, housing and transportation must be handled properly. For example, such as the influence of air transportation activities on local environmental quality conditions such as activities at Cilik Riwut Airport, Pahandut Village, Pahandut District, Palangka Raya City, Central of Kalimantan. The research method used is a qualitative method with data analysis instruments such as Sound Level Meter Instrument, Anemometer, GPS, Flight Radar, Google Maps Application and WECPNL Instrument (Weighted Equivalent Continuous Percepived Noise) and data collection is carried out for three days in accordance with the arrival and departure of the aircraft. Results of research with  WECPNL analysis show that the noise level on the second day is greater than the third day and the third day is greater than the first day (87,2  > 82,2 > 75,9) with  score average value is 81,7. Noise at Cilik Riwut airport in Palangka Raya City, Central Kalimantan including regional level II and III noise. activities that can be carried out are carrying out engineering activities and planting vegetation which have the function of reducing noise. Keyword: Airport, Environmental, Noice.

scholarly journals PENGEMBANGAN PAPAN PEREDAM BUNYI MELALUI MODIFIKASI NANO SILIKAT AMPAS TEBU PG KREMBOENG DENGAN TEMPLATE SERAT SABUT KELAPA

2019 ◽  
Author(s):  
Hengky Herdianto ◽  
Mochamad Alfi Zahwanul Farich
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Modulus Of Elasticity ◽  
Internal Bond ◽  
Testing Machine ◽  
Sound Level ◽  
Sound Level Meter ◽  
Universal Testing ◽  
Level Meter ◽  
Scanning Electron

Manusia memiliki batas kemampuan mendengar suara pada rentang hingga 140 dB, lebih daripada itu akan terjadi kerusakan pada organ-organ dalam gendang telinga. Ampas tebu PG Kremboeng mengandung 70,97% silikat murni yang berpotensi memberikan penguatan pada papan serat dan meningkatkan performa serap bunyi. Metode yang digunakan untuk sintesis nano silikat ampas tebu dilakukan dengan cara Pretreatment BBA, tukar kation silikat, dan pencucian gel kering. Komponen silikat dan produk lain dalam ampas tebu ditentukan menggunakan difraksi sinar-X (XRD). Morfologi xerogels nano silikat dan papan serat telah diteliti dengan menggunakan Scanning Electron Microscopy (SEM). Daya serap ditentukan dari berat sebelum dan sesudah perendaman dalam air 24 jam. Pengujian keteguhan patah dan Modulus of Elasticity dilakukan dengan Universal Testing Machine. Uji Internal Bond direkatkan pada dua buah blok alumunium dengan perekat besi dan dibiarkan mengering. Koefisien serap diukur dengan sound level meter. Berdasarkan pola XRD, dapat diketahui bahwa terdeteksi medium silicate hydroxide. Berdasarkan mikrograf SEM dapat diketahui suatu struktur bongkahan yang memanjang halus terdiri atas kumpulan-kumpulan partikel nano silikat pada papan dengan template serat sabut kelapa. Sampel terbaik dalam penelitian ini adalah I (60%;17%;23%) dengan nilai DSA 82,38%, MOR 102,84 kg/cm2, MOE 11.228,52 kg/cm2, dan IB 0,83 kg/cm2. Interval nilai koofisien serap taraf intensitas bunyi antar sampel adalah 0,527 < x < 1,000 pada pagi hari, 0,544 < x < 1,000 pada siang hari, dan 0,538 < x < 1,000 pada malam hari. Sehingga secara keseluruhan interval pada segala kondisi waktu adalah 0,527 < x < 1,000.

scholarly journals Analysis of Angklung Sound Intensity as a Acoustic Instrument

2017 ◽  
Vol 2 (1) ◽  
pp. 122 ◽  
Author(s):  
Rizka Silviana Hartanti ◽  
Budi Astuti
Keyword(s):  
Research Method ◽  
Sound Intensity ◽  
Sound Level ◽  
Tube Length ◽  
High Tone ◽  
Sound Level Meter ◽  
Independent Variable ◽  
Constant Distance ◽  
Low Tone ◽  
Level Meter

<p style="text-align: justify;">The purpose of this study was to analysis of angklung sound intensity. The research method is using angklung musician 2 octaves. Each consists of two tube tone that sounded from the tone of G to G ', length and diameter of the tube every tone becomes independent variable, while intensity of the sound produced becomes dependent variable. Sound intensity is measured using a Sound Level Meter is placed with a constant distance. The result showed that G tone was a low tone which had a frequency of 49.5 Hz, first tube had 21.6 cm length and 4.1 cm diameter, second tube had 10.1 cm length and 3.4 cm diameter produced the sound intensity of 90.7 dB. G’ tone was a high tone which had a frequency of 99 Hz, first tube had 10 cm length and 3 cm diameter, second tube had 5.5 cm length and 2.1 cm diameter produced the sound intensity of 99.1 dB. It can be concluded that the higher the frequency, the greater the intensity of the sound produced. The shorter tube length and the smaller tube diameter, the greater the intensity of the sound. ©2016 JNSMR UIN Walisongo. All rights reserved.</p>

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