scholarly journals THE ACOUSTIC QUALITY OF SEKOLAH ALAM CLASSROOM (CASE: SEKOLAH ALAM IN BANDUNG)

2020 ◽  
Vol 5 (1) ◽  
pp. 33
Author(s):  
Widyarko Widyarko
Keyword(s):  
Background Noise ◽  
Sound Level ◽  
Learning Activity ◽  
Reverberation Time ◽  
Data Logging ◽  
School Classroom ◽  
Acoustic Quality ◽  
Conventional School ◽  
Using Data ◽  
Level Meter

ABSTRACT Sekolah Alam (The Nature School) is a new concept of school in Indonesia that divide its learning process, both indoor and outdoor. As it needs more outdoor space for learning activity, this type of school has larger yards yet smaller classroom compared to conventional school. As it is still new, no previous study has been done to understand the relation between space dimensions, building material, and surroundings to this school classroom acoustic quality. Therefore, this journal studied acoustic quality by calculating Reverberation Time (RT60) and measuring Background noise value of one typical class of Sekolah Alam in Bandung. Reverberation Time (RT60) was calculated using space dimensions and materials that exist within the studied classroom, while the background noise value was measured using Data Logging Sound Level Meter (SLM). The results indicate that the studied class has an ideal acoustic quality for learning activity. The main factors that affected these results are the classroom has a small size in volume and surrounded by lush trees which work as noise controls. Keywords: Reverberation Time; Background Noise; Sekolah Alam; Nature School; Classroom; Elementary School

scholarly journals Penilaian Kualitas Akustik Masjid Raudhaturrahman Padang Tiji Menggunakan Simulasi Ecotect

2020 ◽  
Vol 2 (2) ◽  
pp. 357-367
Author(s):  
Yulida Yani
Keyword(s):  
Background Noise ◽  
Simulation Method ◽  
Reverberation Time ◽  
Religious Rituals ◽  
Religious Significance ◽  
Acoustic Quality ◽  
Unique Shape ◽  
High Degree

Mosque is a place of worship for Moslems. It has profound religious significance for the community; it is important that people feel serenity therein. In addition, they need to be able to hear sounds clearly so that they can perform their religious rituals like prayers smoothly and it is also crucial for them to hear speeches with a high degree of intelligibility. This study assessed the acoustic quality of Raudhaturrahman prayer's room, having a unique shape with the dome ceiling covering all dimensions of the building.  This study aims at finding the condition, causes, and improving the acoustic quality to meet the prayer's room acoustic needs.  This study specifically focused on calculating the background noise and reverberation time using the Ecotect Simulation method.  The simulation result demonstrates that the calculation of reverberation time (RT) and the measurement of background noise have not met the desired standard. This study found that the value for RT with occupancy 0%, 50%, 100% is 18, 29s, 7, the 80s, and 4, 71s.  In addition, the result of the background noise is 60 dB.  In conclusion, the acoustic of the Raudhaturrahmah mosque prayer's room is of inferior quality since it does not meet the standard of reverberation time (RT) and background noise for the speech purpose of the room.

scholarly journals The Potency of Waste Paper “Egg Tray” as a Noise-Reduction Material

2015 ◽  
Vol 747 ◽  
pp. 246-249
Author(s):  
Ernaning Setiyowati ◽  
Ihsan Nasrullah
Keyword(s):  
Porous Material ◽  
Urban Areas ◽  
Quantitative Research ◽  
Building Design ◽  
Sound Level ◽  
Sound Level Meter ◽  
Traffic Condition ◽  
Average Value ◽  
Acoustic Quality ◽  
Level Meter

Noise is one of the problems that often occur in urban areas due to the traffic condition. Noise in a building design depends on the choice of materials as sound absorbers. The type of sound dampening material that already exists is a porous material, a resonator, and a panel. The material often used as an absorber is porous materials, because it is relatively cheaper and lighter, especially to reduce the noise in the narrow spaces such as housing and offices. Various substitutes are made from cheap materials, such as the use of recycled materials of egg tray paper with the size of 40 x 40 centimeters. This is a quantitative research that will measure the place of egg tray paper in reducing noise, using a Sound Level Meter. The use of the egg tray paper is able to show an adequate acoustic quality as noise absorbers, with the average value of NR 22-26 dB.

Research on the Vibration Measurement Approach to the On-Line Noise Evaluation for Vehicle Transmissions

2012 ◽  
Vol 562-564 ◽  
pp. 1163-1167
Author(s):  
Feng Qiang Zhao ◽  
Guang Qiang Li ◽  
Hong Ying Hu ◽  
Jia Lu Du ◽  
Chen Guo
Keyword(s):  
Sound Pressure Level ◽  
Production Line ◽  
Background Noise ◽  
Sound Pressure ◽  
Sound Level ◽  
Pressure Level ◽  
Vibration Measurement ◽  
Vehicle Transmissions ◽  
Quality Of Transmission ◽  
Level Meter

At present, the common method of testing noise generated by vehicle transmission before delivery is to measure the noise sound pressure level by means of sound level meter. Since the measurement result is susceptible to background noise, the method can only be operated in anechoic chamber. In this paper, in order to measure sound pressure level directly on production-line, a new vibration measurement method and its relevant formula are presented. The proposed method can effectively avoid being affected by background noise and obtain the sound pressure level of transmission noise on production-line by testing the vibration acceleration signals of transmission box. It’s proved that the new method makes the delivery test of transmission noise more convenient and effective. Moreover, it can improve the delivery quality of transmission as well as the performance of whole vehicle.

scholarly journals ANALISA AKUSTIK STUDIO AUDIO VIDEO RECORDING AKADEMI KOMUNITAS NEGERI PACITAN

GESTALT ◽  
2021 ◽  
Vol 3 (1) ◽  
pp. 19-28
Author(s):  
Eka Dwi Nurcahya ◽  
Citra R Prameswari
Keyword(s):  
Transmission Loss ◽  
Video Recording ◽  
Sound Level ◽  
Sound Level Meter ◽  
Reverberation Time ◽  
Level Meter ◽  
Audio Video

Nilai akustik Ruang adalah salah satu perangkat penting dalam proses rekording. Akademi komunitas Negeri Pacitan telah mempunyai studio audio video yang digunakan untuk praktikum. Akan tetapi belum ada fasilitas untuk melakukan recording audio yang baik seperti ruang kedap suara. Penulis berusaha membuat analisis akustik ruang di studio audio video dengan tujuan dapat menjadi bahan dan dasar untuk membuat studio audio yang baik. Pengukuran noise suara dari berbagai sudut ruang dilakukan untuk mendapatkan data awal sebelum ruang kedap suara dibuat. Data ini akan di analisa dengan formula pengujian ruang akustik. Pengukuran dilakukan menggunakan sound level meter dan fft analyzer untuk menganilsa hasil suara yang telah diredam. Sumber suara yang diujikan adalah suara letupan balon yang dikeraskan dengan sound. Hasil dari penelitian ini noise criteria mencatat lebih dari 30 dB, yang berarti tergolong bising untuk studio audio, noise ini masih di dominasi oleh suara pendingin suara. Reverberation Time waktu dengung juga mencapai 5 detik yang berarti akan memungkinkan feedback suara. Transmission loss yang dihasilkan adalah 21,5 yang masih dikatagorikan sangat rendah.

scholarly journals Acoustic quality assessment in a classroom through simulations and measurements

2021 ◽  
Vol 9 (72) ◽  
Author(s):  
Eriberto Oliveira do Nascimento ◽  
Paulo Henrique Trombetta Zannin
Keyword(s):  
Background Noise ◽  
Speech Intelligibility ◽  
Reverberation Time ◽  
Vocal Health ◽  
Quality Requirements ◽  
Transmission Index ◽  
Speech Transmission ◽  
Acoustic Quality ◽  
Acoustic Comfort ◽  
Minimum Requirements

The acoustic quality in a classroom directly impacts the educational relationship between the student and the teacher, reducing speech intelligibility. In addition, inadequate acoustic comfort burdens the vocal health of teachers. This study evaluated a classroom at the Federal University of Paraná, Campus Centro Politécnico, to verify its acoustic quality. The measurements of the acoustics descriptors: Reverberation Time (RT), Definition (D50), Central Time (Ts), Early Decay Time (EDT) were performed according to the ISO 3382-2 standard, concerning Noise Curves (NC) and Background Noise (BGN) these were evaluated by the  NBR 10152 and S12.2 standards. The Speech Transmission Index (STI) was measured according to IEC 60268-16 and evaluated according to ISO 9921. The useful-detrimental ratio (U50) and the other descriptors were simulated in the ODEON software version 11. Thus, the results showed that the evaluated room did not meet the minimum requirements in terms of acoustic quality, for the descriptors RT, STI, Ts, D50, RF, and NC. Simultaneously, the RT and STI were also outside the limits established by the German and Finnish standards. Therefore, it is concluded that the evaluated classroom did not reach the minimum acoustic quality requirements.

scholarly journals Analisis Reverberation Time Terhadap Kenyamanan Audial pada Ruang Auditorium Menara Pinisi UNM

2019 ◽  
Vol 22 (1) ◽  
pp. 49-56
Author(s):  
Zainatun Zainatun
Keyword(s):  
Qualitative Method ◽  
Quantitative Methods ◽  
Sound Pressure ◽  
Sound Level ◽  
Reverberation Time ◽  
Measuring Point ◽  
Qualitative And Quantitative Methods ◽  
Acoustic Comfort ◽  
Level Meter ◽  
Level Of Sound Pressure

Auditorium space is one of the building functions that must be supported will be acoustic comfort. This research aimed (1) to determine the condition of auditory comfort in the auditorium space according to the opinion of the space users; (2) to investigate the value of the existing reverberation time in the space. The research used two methods, namely the qualitative and quantitative methods; the qualitative method was conducted by distributing questionnaires, interviews and direct observation in the field. The results of the questionnaires were analyzed using SPSS version 22, while the quantitative method was conducted by measuring the sound pressure level using the Sound Level Meter (SLM) and calculation of the Reverbertion Time (RT) by using the Sabine Equation and the simulation was conducted using the Ecotect Software. The research results indicated that, based on the questionnaires distribution to the space user, and according to the seat position, 44.3% of the older users felt comfortable about the spread of sound in the space, while 41.3% did not feel comfortable with the position of the seats and the sound they received, and only 2.0% felt very comfortable with the distribution spread of sound in the space. Meanwhile,  the results of the measurement of the highest Level of Sound Pressure showed that at the measuring point of 31 was 94.0 dB and the lowest at point of 22 was 60.8 dB. The results of the  RT calculation at the auditorium when the auditorium was empty was about 0.45-0.40 seconds at the frequency of 500hz.

scholarly journals Pembuatan Alat Ukur Distribusi Bunyi dalam Ruang, secara Nirkabel Berbasis Mikrokontroler

2019 ◽  
Vol 1 (1) ◽  
pp. 99
Author(s):  
Deanu Haratinu Tu’u ◽  
Iwan Sugriwan ◽  
Arfan Eko Fahrudin
Keyword(s):  
Sound Source ◽  
Background Noise ◽  
Sound Intensity ◽  
Sound Level ◽  
Primary Data ◽  
Measuring Instrument ◽  
Measuring Point ◽  
Level Meter ◽  
Error Percentage

Sound distribution and background noise, is an important aspect in the making of study-purposed room. Properly distributed sound would ensure everyone in the room to hear the same quality of sound. Good sound quality is defined as a sound that did not diminish its character (sound intensity and sound clarity) significantly to its sound source. In this research, has been fabricated an in-room sound distribution measuring instrument, based on the Arduino microcontroller that equipped with nRF24L01 to be wirelessly functionated. The fabricated measuring instrument consist of 4 transmitter devices and 2 receiver devices. The transmitter devices is an Arduino Pro Mini microcontroller that equipped with nRF24L01 and a sound sensor. The receiver devices is an Arduino Nano microcontroller equipped with nRF24L01, that connected to a PC, and an Arduino Pro Mini microcontroller equipped with nRF24L01 that connected to a speaker. The fabricated measuring instrument equipped with a Python 2.7-based acquisition software to acquire data in real time and store it in CSV (Comma Separated Value) format. Test was carried out to the transmitter devices that equipped with a sound sensor and the receiver device that connected to a speaker. The transmitter devices was compared with a standard sound level meter, and showed 0,65% - 1,24% of error percentage. The test made to receiver device showed that sound intensity of 100 dB could only be achieved with frequency of 2000 Hz and 3000 Hz. On  the measurement of sound distribution, the primary data of Einstein Hall sound distribution has been obtained, with 16 sound level measuring point, 7 variations of sound source position, and 5 variations of sound source frequency.The background noise measurement of Einstein Hall of the FMIPA ULM, showed the value varied between 57 dB – 60,56 dB.

scholarly journals ANALISIS KINERJA FASILITAS OPERASI PERLINTASAN SEBIDANG (STUDI PADA RESORT 4.6 SMT)

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Mariana Diah Puspitasari
Keyword(s):  
Public Perception ◽  
Public Perceptions ◽  
Sound Level ◽  
Sound Level Meter ◽  
Population Mean ◽  
The Public ◽  
Road Users ◽  
Loudness Level ◽  
Using Data ◽  
Level Meter

PT Kereta Api Indonesia (KAI) during 2019 and 2018 calculated that there had been 655 accidents at level rail crossings. Accidents often occur in high traffic areas such as the Telecommunication Signal Resort 4.6 SMT. So the researchers conducted research in order to find out the performance of the railway operating facilities under the auspices of the Telecommunication Signal Resort 4.6 SMT as well as public perceptions of its performance. Researchers used a sound level meter to measure the loudness level of the level rail crossings siren sound at the research location. Furthermore, it is compared with the standards stipulated in the Minister of Transportation Regulation Number 44 of 2018. Then tested using Anova to find out whether the population mean will be of the same value using data from each population. Furthermore, an unstructured interview was conducted to hear the perceptions of road users on the performance of the operational facilities at level rail crossings which became the research object. The results showed that the five level rail crossings which were the object of the study had the loudness level of the siren sound below the set standard. In contrast, flat cross lights perform well. Meanwhile, the public perception of the operational facilities at level rail crossings is that they are functioning well.

scholarly journals An Assessment of the Impact of Helicopter Noise: Case Study of Mgbuoshimini Community Nigeria

2020 ◽  
pp. 1-16
Author(s):  
OF Orikpete ◽  
◽  
DRE Ewim ◽  
Keyword(s):  
Background Noise ◽  
Low Noise ◽  
Sound Level ◽  
Residential Areas ◽  
Noise Levels ◽  
Commercial Aviation ◽  
High Noise ◽  
Statistical Measures ◽  
Level Meter ◽  
The Impact

With the projected growth in demand for commercial aviation, it is anticipated that there will be an increased environmental impact associated with noise, air quality, and climate change. Against this backdrop, the noise levels experienced by the residents of Mgbuoshimini Community due to helicopters takeoff and landing were studied. The study was carried out for 14 days at three different locations using a Class 2 Optimus sound level meter from 7am to 5pm daily. Analysis involved the equivalent noise levels, statistical measures for the background noise, aircraft flyover noise as well as the Noise Gap Index (NGI) . It was found that the equivalent noise levels of the background noise and aircraft flyover noise range from 67.7 dBA to 72.4 dBA and 88.4 dBA to 88.6 dBA respectively. The peak background noise and aircraft flyover noise ranged from 69.17 dBA to 79 dBA and 93.2 dBA to 94.8 dBA respectively. These values exceeded the recommended value of 60 dBA for residential areas. Two models to determine the NGI for both low noise areas and high noise areas were developed. A correlation coefficient of 0.70 and 0.88 were obtained between the actual and predicted values of NGI for both low and high noise areas. Therefore, it is recommended that buildings should be adequately insulated by use of noise-absorbing materials. Furthermore, environmentally friendly (quieter) aircrafts should be used by the airline company operating in that area

Sign in / Sign up

Export Citation Format

Share Document