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All Journal Seminar Nasional Aplikasi Teknologi Informasi (SNATI) JFA (Jurnal Fisika dan Aplikasinya) Jurnal Instrumentasi Jurnal Standardisasi
Denny Hermawanto
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Agriculture, Biological Sciences & Forestry Chemistry Computer Science & IT Economics, Econometrics & Finance Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics Social Sciences Other

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 1 
The Automation of Sound Absorption Coefficient Measurement Denny Hermawanto; Achmad Suwandi
Seminar Nasional Aplikasi Teknologi Informasi (SNATI) 2006
Publisher : Jurusan Teknik Informatika, Fakultas Teknologi Industri, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

By manual method, the sound absorption coefficient measurement should be done by utilizing many type of equipment such as: measuring amplifier, level recorder, band-pass filter, protactor, etc. However it caused inefficient and need longer time in processing measurement data, therefore the automation system of sound absorption coefficient has been realized. An acoustical real time analyzer type B&K 2144 has been used to record the decay of sound pressure level, thus the processing data is driven by computer software program. By using this developed measurement system, the configuration of equipment which is used in measurement system is becoming more simplified, moreover the time process which is required for sound absorption coefficient measurement can be reduced significantly.Keywords: sound absorption coefficient, automation measurement system
Evaluation and Analysis of Uncertainty Measurement of The Sound Level Meter Calibration by Coupler Method Bondan Dwisetyo; Denny Hermawanto
Jurnal Fisika dan Aplikasinya Vol 17, No 1 (2021)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v17i1.6874

Abstract

The evaluation and analysis of uncertainty measurement of sound level meter calibration by coupler method was carried out by Research Group for Acoustics and Vibration – National Standardization Agency of Indonesia (BSN). The aims of this work is to evaluate and analyze the uncertainty measurement of sound level meter (SLM) calibration using the coupler method, where it is focused for A-frequency weighting as main parameter based on Guide to the expressions of Uncertainty in Measurement (GUM). The uncertainty budgets that obtained of this work consists of a repeated measurement of sound level meter test using the multifunction acoustic calibrator as the reference instrument, readability of SLM, sound pressure level calibration of the reference along with drift of the standard, sound pressure response, the level of accuracy, the total harmonic distortion with noise, and the capability of the used insulation box to insulate background noise from outside. From the result of case study, the standard instrument withal its sound pressure response and level of accuracy has the highest contribution to provide the significant evaluation of the expanded uncertainty at the frequency of 8000 Hz that put of the values are 0,17 dB and 0,14 dB respectively. After that, the obtained expanded uncertainty reach up to 0,48 dB of this frequency. In addition, this result also state that the proposed expanded uncertainty values are below to the maximum of acceptance values that required by IEC 61672-1:2013. Thus, it is acceptable and is considered to be applicated further for the calibration of sound level meter, and other the utilized microphone instruments.
A Proposed Method to Find Exciter’s Maximum Acceleration Magnitude on Vibration Meter Calibration System Ninuk Ragil Prasasti; Denny Hermawanto
Instrumentasi Vol 44, No 2 (2020)
Publisher : LIPI Press, Anggota IKAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31153/instrumentasi.v44i2.206

Abstract

National Measurement Standards-National Standardization Agency of Indonesia (SNSU-BSN) has implemented calibration method for vibration meters according to ISO 16063-21:2003. In this calibration system, an electrical signal at a particular frequency and magnitude is generated by the signal generator. Then it is amplified before converted into a mechanical vibration by the exciter. A vibration acceleration produced by the exciter is measured by the reference accelerometer as well as the vibration meter under test simultaneously. However, the maximum acceleration generated in the calibration system is affected and limited by several factors such as a total mass load of accelerometer, data acquisition system, displacement and velocity limits of an exciter. This paper presents the analysis of maximum acceleration produced by the exciter in the vibration meter calibration system considering the effect of those factors within a frequency range from 10 Hz to 5 kHz.
ANALISIS KARAKTERISTIK GETARAN PADA KERETA API REL LISTRIK DAN KERETA API REL DIESEL Achmad Suwandi; Daryono Restu Wahono; Denny Hermawanto
JURNAL STANDARDISASI Vol 11, No 2 (2009): Vol. 11(2) 2009
Publisher : Badan Standardisasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31153/js.v11i2.645

Abstract

Vibration monitoring was carried out in two type of trains, namely Railroad Electric Train (KRL) and RailroadDiesel Train (KRD). From measurement results, it was clearly seen that both trains indicate the similar vibrationcharacteristics, where three dominant frequencies, so called: f1, f2 and f3 always appeared in the region offrequency measurement: 1Hz – 80Hz. The maximum vibration level in KRL was found to be 0.17m/s2 at f3(40Hz)in longitudinal direction and 0.164m/s2 at f3(50Hz) in transversal direction. Meanwhile, the maximum vibrationlevel in KRD was found to be 0.37m/s2 at f3(80Hz) in longitudinal direction and 0.354m/s2 at f1(2Hz) in transversaldirection. Based on these results, it is proved that the vibrations in KRD were much higher than the vibrations inKRL. However it is important to be noted, that the vibration levels of both trains were still within allowable limitwhich is recommended by Standard ISO 2631/I (1985).
MICROPHONE FRONT CAVITY DEPTH MEASUREMENT USING NON-CONTACT METHOD AT NATIONAL MEASUREMENT STANDARDS – NATIONAL STANDARDIZATION AGENCY OF INDONESIA Chery Chaen Putri; Denny Hermawanto
JURNAL STANDARDISASI Vol 21, No 2 (2019)
Publisher : Badan Standardisasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31153/js.v21i2.748

Abstract

Front cavity depth of microphone has influence in the determination of laboratory standard microphone sensitivity. Therefore this parameter is included in the measurement uncertainty budget. To determine microphone sensitivity accurately, it is necessary to measure the actual front cavity depth instead of using nominal value. This paper explains the measurement of LS1P and LS2P standard microphone front cavity depth using optical depth measurement facilities at SNSU-BSN and its effect on determining microphone sensitivity. The measurement was obtained from 4 positions distributed over the diaphragm for each microphone. The front cavity depth measurement result for LS1P is 1,94 mm ± 0,01 mm and for LS2P is 0,48 mm ± 0,01 mm  These results comply with IEC 61094 Measurement Microphones-Part 2: Primary Method for Pressure Calibration of Laboratory Standard Microphones by Reciprocity Technique as the results are within the permissible range.
Co-Authors Achmad Suwandi Bondan Dwisetyo Chery Chaen Putri Daryono Restu Wahono Ninuk Ragil Prasasti