Papers by Denny Hermawanto
PROCEEDING OF THE 1ST INTERNATIONAL CONFERENCE ON STANDARDIZATION AND METROLOGY (ICONSTAM) 2021
Sound Transmission Loss (STL) is the difference between sound power in a source room and a receiv... more Sound Transmission Loss (STL) is the difference between sound power in a source room and a receiver room at a single frequency where both rooms are separated by a partition. STC values show the character of a partition in reducing sound. This paper will discuss comparison STL values on different types of partitions. These partitions are tempered glass, engineering panels, and patterned wood. The thickness of the tempered glass is 35mm, the thickness of the engineering panel is 85mm and the thickness of patterned wood is 50mm. The frequency of measurement is 125Hz-4kHz with a 1/3 octave frequency band and the procedure of measurement is based on ISO 10140-2 and ISO 10140-4, or ASTM E90-09. Base on the measurement result, STL value from engineering panel batter than the tempered glass on frequency 125 Hz-2,5kHz, but frequency 3,15kHz-4kHz tempered glass batter than engineering panel.
Journal of Physics: Conference Series, 2021
A large number of industrial needs to the sound level meter (SLM) calibration has encouraged the ... more A large number of industrial needs to the sound level meter (SLM) calibration has encouraged the laboratory to develop a qualified calibration system. As one of the SLM calibration methods required by the standard, the coupler method is considered as the most convenient to be implemented, especially for the secondary laboratory. Therefore, the aim of this work is to compare the SLM calibration for the frequency weighting parameter by this method using the instrument standards that comprise of a multifunction acoustic calibrator and a working standard of pressure microphone (WS2-P Microphone). Moreover, the result of frequency weighting calibration using these standards, therefore, is compared to the reference value required by IEC 61672-1. From the result, the deviation values of these standards are obtained relative to the reference. At the low to middle frequencies, the deviation values are slight relatively, while at the higher frequency, it tends to bigger. In addition, these me...
Journal of Physics: Conference Series, 2021
The number of smartphone-based application software for noise measurement has been increasing rec... more The number of smartphone-based application software for noise measurement has been increasing recently. Some application software has complete features of the sound level meter such as frequency weighting and time averaging. They have been used for field noise measurement. However, the reliability of the smartphone-based sound level meter as a measurement instrument has not known yet. In this paper, we tested the smartphone-based sound level meter application software according to the international standard for sound level meter calibration IEC 61672. The parameter of self-generating noise, frequency weighting, and long-term stability in a fully anechoic chamber was measured. We evaluated the class of the smartphone-based sound level meter from the deviation of the measured parameter with the tolerance value described in the standard. The practical implementation of the calibration method is also discussed.
Journal of Physics: Conference Series, 2021
Modern smartphones have been equipped with MEMS sensors allowing them to be used for advanced pur... more Modern smartphones have been equipped with MEMS sensors allowing them to be used for advanced purposes. A MEMS accelerometer is embedded in the smartphone to sense motion and vibration. Recently, many smartphone-based vibration-meter applications software employed the embedded accelerometer and used them for vibration monitoring and field measurement. However, the accuracy of this kind of vibration meter has not known yet. In this paper, we discuss about the evaluation of smartphone-based vibration meter using the standard method for vibration meter calibration described in the ISO 16063-21. A vibration measurement by the smartphone-based vibration meter is compared to the reading of the reference accelerometer type B&K 8305. The evaluation was conducted in a frequency range of 10 Hz to 50 Hz with the amplitude of 0.1 G to 1 G. This study showed that the accuracy of the smartphone-based vibration meter is decreased in the higher frequency range.
Journal of the Acoustical Society of America, Feb 1, 2023
PROCEEDING OF THE 1ST INTERNATIONAL CONFERENCE ON STANDARDIZATION AND METROLOGY (ICONSTAM) 2021
Mapping of used lithium-ion electric vehicle battery matrix transportation method in scattered ar... more Mapping of used lithium-ion electric vehicle battery matrix transportation method in scattered areas to achieve a sustainable recycling production process
PROCEEDING OF THE 1ST INTERNATIONAL CONFERENCE ON STANDARDIZATION AND METROLOGY (ICONSTAM) 2021
Mapping of used lithium-ion electric vehicle battery matrix transportation method in scattered ar... more Mapping of used lithium-ion electric vehicle battery matrix transportation method in scattered areas to achieve a sustainable recycling production process
IOP Conference Series: Materials Science and Engineering, 2021
The application of noise dosimeter in an industrial and construction area has shown an increase i... more The application of noise dosimeter in an industrial and construction area has shown an increase in the last decade in Indonesia significantly. The benefit of using this acoustical instrument is having a parameter known as a percentage of noise dose exposure that appropriate for the workers located in a loudness area. Moreover, the industrial necessity related to this instrument calibration quantity tends to increase in recent years. However, the calibration service related to this parameter is not available in Indonesia yet. Therefore, the aim of this work is to realize the calibration of noise dosimeters based on the percentage of noise dose exposure using an absolute method. In this method, it is necessary to apply the insert voltage technique to determine an absolute sound pressure level (SPL), where a whole measurement process is performed in a free field condition. The determined parameter is the percentage of noise dose (D), and time-weighted average (TWA) with SPL of 104 dB a...
PROCEEDING OF THE 1ST INTERNATIONAL CONFERENCE ON STANDARDIZATION AND METROLOGY (ICONSTAM) 2021
The SI unit of sound pressure is Pascal (Pa). Nevertheless, the decibel (dB) unit is commonly use... more The SI unit of sound pressure is Pascal (Pa). Nevertheless, the decibel (dB) unit is commonly used, which expresses the measured sound pressure ratio to the hearing threshold (20 µPa). The definition of an acoustic unit is realized using an artifact in the form of a microphone. A quantity of microphone is the sensitivity that has a unit of mV/Pa. Current traceability indicates that the sound unit is defined indirectly by the microphone sensitivity instead of sound pressure. The microphone's sensitivity can be determined accurately using the reciprocity calibration method, which is the current primary standard in acoustics traceability. However, it is challenging to implement this primary method for a new type of acoustics transducer such as MEMS microphone due to its non-regularized dimension. This paper discusses an optical method for the non-intrusive measurement of sound pressure based on the acousto-optic effect relation. The basic concept and the realization of the optical sound measurement method are explained. The method's capability to measure sound pressure shows its potential to become a future primary standard method for acoustics traceability that can be applied for a conventional and new type of acoustical transducer.
Instrumentasi, Aug 22, 2017
This paper explains genetic algorithm for novice in this field. Basic philosophy of genetic algor... more This paper explains genetic algorithm for novice in this field. Basic philosophy of genetic algorithm and its flowchart are described. Step by step numerical computation of genetic algorithm for solving simple mathematical equality problem will be briefly explained
Two flavours Skyrmion will be analyzed analytically, in case of static and rotational Skyrme equa... more Two flavours Skyrmion will be analyzed analytically, in case of static and rotational Skyrme equations. Numerical solution of a nonlinear scalar field equation, i.e. the Skyrme equation, will be worked with finite difference method. This article is a more comprehensive version of SU(2) Skyrme Model for Hadron which have been published
Vibration monitoring was carried out in two type of trains, namely Railroad Electric Train (KRL) ... more Vibration monitoring was carried out in two type of trains, namely Railroad Electric Train (KRL) and Railroad Diesel Train (KRD). From measurement results, it was clearly seen that both trains indicate the similar vibration characteristics, where three dominant frequencies, so called: f 1 , f 2 and f 3 always appeared in the region of frequency measurement: 1Hz – 80Hz. The maximum vibration level in KRL was found to be 0.17m/s 2 at f 3 (40Hz) in longitudinal direction and 0.164m/s 2 at f 3 (50Hz) in transversal direction. Meanwhile, the maximum vibration level in KRD was found to be 0.37m/s 2 at f 3 (80Hz) in longitudinal direction and 0.354m/s 2 at f 1 (2Hz) in transversal direction. Based on these results, it is proved that the vibrations in KRD were much higher than the vibrations in KRL. However it is important to be noted, that the vibration levels of both trains were still within allowable limit which is recommended by Standard ISO 2631/I (1985).
This paper presents the software implementation of binaural sound source localization employing i... more This paper presents the software implementation of binaural sound source localization employing interaural time difference (ITD) method on NIOS system built on FPGA Altera DE2-70. Hardware components on NIOS system were configured and generated using SOPC builder. FFT based cross correlation algorithm was developed for ITD computation. The developed system was tested in a semi-anechoic room and used white noise as sound source. Best sound arrival estimation obtained for sound coming from 0 to 80 degree in front horizontal plane with average estimation time 0.501 sec Cite this ArticleDenny Hermawanto, Arif Sasongko, Joko Sarwono. Sound source localization application on nios II embedded system. Journal of Embedded Systems and Applications. 2015; 3(3): 1–7p.
The vibration exciter is an artificial vibration measurement systems producer who can work within... more The vibration exciter is an artificial vibration measurement systems producer who can work within a measuring range of specific frequencies. Vibration exciter needed to answer an order related to calibration of measuring instruments with very low frequency vibration sensor seismometer for earthquake disaster mitigation. The design of this research is divided into two parts, designing the electronics and mechanics parts. In general, a vibration exciter system works by entering PWM value into Arduino Uno to determine the value of the duty cycle and apply a voltage to a DC motor as an actuator causing angular acceleration. An aluminum plate vibrating table which is connected to a DC motor using a connecting rod will move forward and backward translation. The value of forward and backward movement is detected by the accelerometer sensor and the conditioning amplifier will reduce the noise of the measurements performed. The frequency and acceleration value of the vibrating table can be a...
Measurement of sound pressure inside a tube is important for duct acoustics and calibration. Inse... more Measurement of sound pressure inside a tube is important for duct acoustics and calibration. Inserting microphone directly into sound field will disturb the field and may produce inaccurate measurement result. Recently, non-intrusive sound pressure measurement using optical techniques have been proposed. As this optical techniques yield line integral of sound pressure, reconstruction techniques have been applied to obtain 3D sound field, and its result in free field measurement shows good agreement with microphone. In this paper, measurement of sound pressure inside a transparent rigid tube is presented. Parallel laser beam of laser Doppler vibrometer was used to obtain line integral of sound pressure, and filtered backprojection method with combination of Butterworth and Ramp filter was applied to reconstruct the sound field. An acrylic tube with diameter, length and thickness of 61.75 mm, 22 mm and 3.5 mm, respectively, was used for the experiment. A loudspeaker was attached on one side of the tube as the sound source, and the other side of the tube was closed by a rigid material. Sound field inside tube was successfully reconstructed, and its comparison with microphone at the center of the tube shows deviation of less than 1 dB.
Jurnal Standardisasi, 2021
The implementation of laboratory measurement of airborne sound insulation based on ISO and ASTM s... more The implementation of laboratory measurement of airborne sound insulation based on ISO and ASTM standards was carried out at SNSU BSN. The aim of this work to realize the measurement of airborne sound insulation for several sample tests, where the procedure of the test is performed according to the updated standard ISO 10140 and ASTM E90. Besides, the single number rating also is determined based on ISO 717-1 and ASTM E413. This measurement has been conducted in the two reverberation rooms using pressure method consist of measuring the sound pressure level, measuring the reverberation time, obtaining the sound reduction index (R) or sound transmission loss (STL), and determination of a single-number ratings of the samples test. From the results, some parameter requirements such as the frequency range and the rounding procedure of R or STL influence the measurement result slightly. Subsequently, the significant difference is obtained for the determination of single number rating in t...
Pertemuan dan Presentasi Ilmiah Standardisasi, 2021
The implementation of sound absorption measurement based on ISO and ASTM standard was carried out... more The implementation of sound absorption measurement based on ISO and ASTM standard was carried out at National Standardization Agency of Indonesia (BSN). The aim of this work is to realize measurement of sound absorption, where the procedure is conducted based on ISO 354 and ASTM C423. In addition, the single number rating of the specimens also is determined based on ISO 11654, ASTM C423-17 and C423-99a. To measure the reverberation time inside a reverberation room, the interrupted noise method is used. Therefore, there are the significant differences between these standards related to the single number ratings of the test specimen. From the result, the significant deviation values is obtained for the three samples of perforation gypsum boards that provide the shape indicator information based on ISO standard that the values for the corresponding specimens are 0.75L, 0.80L, and 0.65L respectively. Meanwhile, either the current ASTM or the old version only inform the rating values without additional information that represented by SAA and NRC respectively that the values are 0.57 and 0.55 successively. Moreover, the result of this work will support the development of acoustic comparison coupler as a portable medium calibration that utilize the absorber as the supporting components.
Jurnal Fisika dan Aplikasinya, 2020
The calibration of sound level meter (SLM) using a coupler method has been introduced. This metho... more The calibration of sound level meter (SLM) using a coupler method has been introduced. This method utilizes a multifunction acoustic calibrator as a portable laboratory instrument. By the reason of its convenient application, it is appropriate to be realized by the secondary calibration laboratory. To complete the requirement of calibration result provided by ISO 17025, an analysis of the uncertainty measurement related to this calibration is strongly needed. Therefore, this work aims to provide an evaluation and analysis of some elements that influence to the coupler method of SLM calibration using the statistical approximation to determine the major parameters such as standard uncertainty, combine uncertainty, degree of freedom, and expanded uncertainty in accordance with The Guide to the expressions of Uncertainty in Measurement (GUM). Moreover, a case study related to this instrument calibration also discussed along this paper. From the result, the uncertainty budgets that contribute to the SLM calibration has been obtained, and generally, it is found that the standard instrument has the highest contribution to the determination of the expanded uncertainty. For the whole results, the obtained uncertainty values are still acceptable according to the acceptance limit values that required by IEC 61672-1.
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Papers by Denny Hermawanto