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Developing Sub-wavelength Sound Absorber Based on Coiled Up Tube Resonator Prasetiyo, Iwan; Wongso, Elsa Nalita; Sarwono, Joko
Journal of Engineering and Technological Sciences Vol 51, No 3 (2019)
Publisher : ITB Journal Publisher, LPPM ITB

Sub-wavelength sound absorbers are attractive for dealing with noise control at low-frequency (long-wavelength) sounds. To be efficient in absorbing the sound energy, resonator based absorbers are preferable over fibrous porous ones. In this paper, a coiling up space approach is introduced to a tube resonator system in order to realize a sub-wavelength absorber structure. In this way, the air channel of the tube resonator is a coplanar coiled up channel rather than a straight channel as found in conventional tube resonators. The effect of the geometrical properties of the aperture and the air channel were studied further to look at their relationship to impedance mismatch, which coiling up systems typically suffer from. It was found that the proposed approach could realize a sub-wavelength absorber system up to 1/32 wavelength of peak sound absorption. Selection of the shape and dimensions of the aperture must be done with great care as indicated by the measurement results. Moreover, the behavior of the coiled up tube resonator deviates from that of the straight tube as the reflection factor is increased, although the target resonance frequency is close to the target. It was also found that a squared aperture shape as well as increasing the cavity thickness is useful to deal with impedance mismatch.

Developing Sub-wavelength Sound Absorber Based on Coiled Up Tube Resonator Iwan Prasetiyo; Elsa Nalita Wongso; Joko Sarwono
Journal of Engineering and Technological Sciences Vol. 51 No. 3 (2019)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2019.51.3.2

Sub-wavelength sound absorbers are attractive for dealing with noise control at low-frequency (long-wavelength) sounds. To be efficient in absorbing the sound energy, resonator based absorbers are preferable over fibrous porous ones. In this paper, a coiling up space approach is introduced to a tube resonator system in order to realize a sub-wavelength absorber structure. In this way, the air channel of the tube resonator is a coplanar coiled up channel rather than a straight channel as found in conventional tube resonators. The effect of the geometrical properties of the aperture and the air channel were studied further to look at their relationship to impedance mismatch, which coiling up systems typically suffer from. It was found that the proposed approach could realize a sub-wavelength absorber system up to 1/32 wavelength of peak sound absorption. Selection of the shape and dimensions of the aperture must be done with great care as indicated by the measurement results. Moreover, the behavior of the coiled up tube resonator deviates from that of the straight tube as the reflection factor is increased, although the target resonance frequency is close to the target. It was also found that a squared aperture shape as well as increasing the cavity thickness is useful to deal with impedance mismatch.

The Implementation of Soundscape Composition to Identify the Ideal Soundscape for Various Activities Joko Sarwono; Anugrah Sabdono Sudarsono; Andini Hapsari; Helga Salim; Ranti Dwi Tassia
Journal of Engineering and Technological Sciences Vol. 54 No. 1 (2022)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2022.54.1.7

Soundscapes are affected by several factors and one of them is the activities done in the space concerned. People expect different acoustic environments for different activities, but there is no specific guidance for designing an ideal acoustic environment for different activities. This study aimed to identify ideal urban acoustic environments for four different activities: reading, relaxing, talking with friends, and playing with children. The ideal acoustic environment was evaluated using the soundscape composition concept. The concept was implemented by an acoustic environment simulator that enabled the respondents to compose their ideal acoustic environment and identify the perception of their composition. The sound source selection and perception rating were analyzed to understand the ideal acoustic environment and perception for different activities. This study identified the ideal soundscapes for four different activities and the perception expected to be present in the ideal environments for those activities. The result can be beneficial as guidance for urban soundscape design.

SOUNDCSAPE AND THE UNDERSTANDING OF HISTORIC DISTRICTS IN BANDUNG Widjaja Martokusumo; Heru W Poerbo; Joko Sarwono; Anugrah S. Sudarsono; Ni Putu Amanda Nitidara; Michael Isnaeni Djimantoro; Amanda Arifiana; Feysa A. Poetry
TATALOKA Vol 21, No 2 (2019): Volume 21 No. 2, May 2019
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/tataloka.21.2.371-380

According to UNESCO Convention 1972, cultural heritage consists of tangible and intangible heritage. Soundscape has been considered as a part of the intangible heritage, and it refers to the perceptual quality. In the realm of built environment, perceptual qualities become important concerns, since cultural heritage cannot be described and appreciated using mono-sensorial analysis fundamentally based on vision. As perceptual construct, soundscape has been considered as a new approach in understanding the formation and design of sensitive urban environment. It is argued that perceptual quality, besides visual aesthetics, geographic, psychological and socio-cultural aspects, must be part of the considerations in architecture and urban design. Bandung is well-known for its urban heritage, and as former well-designed colonial town, the historic buildings and areas have morphologically constituted the structure of the inner city. However, the modernization and globalization have led to inevitable transformations, including the destruction of historic places and fabric/district of cultural significance. With the latest urban dynamics, urban environment has also experienced an inescapable process of “sound globalization”, which led to the losing of specific sound-marks in the respective area. This paper is based upon an ongoing research project on strategy for conservation of historic urban areas using soundscape approach. Methodologically, through sound walks, surveys and interviews, several notions relating to urban spatial and formal quality have been collected, assessed and interpreted. The result stands for the understanding of perceptual aspects and quality of urban space in historic urban areas that may contribute to the heritage conservation strategy.

Designing Urban Soundscape for Various Activities based on Soundscape Expectation Anugrah Sudarsono; Sugeng Joko Sarwono; Andini Hapsari; Helga Salim
Journal of Visual Art and Design Vol. 13 No. 2 (2021): Journal of Visual Art and Design
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.vad.2021.13.2.3

The concept of soundscape aims to provide a more holistic understanding of the acoustic environment by taking several aspects into account, such as human perception, the acoustic environment and the context of the space. The soundscape concept is primarily concerned with the human experience and is considered more effective to access the acoustic quality of urban areas than traditional sound measurement. Soundscape analysis was used in this study to determine the relationship between various activities occurring in urban areas and their associated sound sources. This relationship can be used as design guidance for urban soundscape. The interaction was analyzed using the soundscape expectation approach, which is based on people’s memories of urban areas. The participants of this study were requested to compose an ideal acoustic environment according to their expectation for doing four activities: reading, relaxing, talking with friends, and playing with children. According to the data of the participants’ composition there is no significant difference in the overall sound levels between various activities. As a result, the appropriate acoustic environment cannot be determined solely based on the overall sound level. Individuals have varying expectations of sound sources when engaging in various activities.

Multisensory Comfort in Public Open Spaces: Predicting Perceived Comfort from Environmental Conditions Ni Putu Amanda Nitidara; Joko Sarwono; Suprijanto Suprijanto
DIMENSI: Journal of Architecture and Built Environment Vol. 52 No. 2 (2025): DECEMBER 2025
Publisher : Institute of Research and Community Outreach, Petra Christian University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/dimensi.52.2.121-128

This study investigates comfort in public open spaces in Bandung by linking measured environmental conditions with visitor perceptions collected through questionnaires. Logistic regression was applied to model the relationship between the two data sets. The model achieved good discriminatory power for predicting comfort, with Area Under the Curve (AUC) of 0.752, accuracy of 0.679, precision of 0.884, and sensitivity of 0.686. Five parameters emerged as significant predictors of comfort: L90, relative humidity, DGI, wind speed, and temperature. Higher comfort is associated with lower values of L90, DGI, and temperature, while increasing relative humidity and wind speed improves comfort. These results confirm that overall comfort in outdoor urban environments arises from multisensory interactions. Understanding these interactions provides urban planners and architects with a practical basis for developing strategies to improve the quality and livability of public open spaces.

Teknik termodifikasi untuk memprediksi jarak privasi dan gangguan pada ruang kantor terbuka Sentagi Sesotya Utami; Joko Sarwono; Zulfi Aulia Rachman
ARTEKS : Jurnal Teknik Arsitektur Vol 8 No 2 (2023): ARTEKS : Jurnal Teknik Arsitektur | Mei 2023 ~ Agustus 2023
Publisher : Program Studi Arsitektur Fakultas Teknik Universitas Katolik Widya Mandira

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30822/arteks.v8i2.1626

Open-plan offices have become widely adopted in various industries as a workplace environment. However, this office layout type suffers from speech privacy, which can be represented by the acoustic parameter known as the Speech Transmission Index (STI). ISO 3382-3:2012 provides guidelines for calculating the acoustic parameters of a room tailored explicitly for open-plan offices. However, the existing method in ISO 3382-3:2012 requires a parallel layout of workstations to determine the STI value, which is hardly found in modern office settings. This study presents a technique to predict the ideal values of rP and rD, based on the relationship between %Alcons and the Speech Transmission Index (STI) for a specific workstation, using linear regression and in-situ measurements. The analysis of acoustic conditions in an open-plan office reveals that modified techniques can predict the acoustic quality in a modern office layout. The D2, S values indicate good acoustic quality, but the Lp, A, S,4m values do not meet the required standard. Using %Alcons equations, the study shows how to predict distraction distances and categorize workstations as 'Distracted' or 'Not distracted'. The results indicate only a small percentage of workstations allow for private communication.

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