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Analysis & Prediction of Sound Environment

Quantitative prediction of sound environment is very useful for architectural/environmental designing and planning. In order to establish assessment methods on room acoustics, noise propagation, acoustic material performance etc., this section performs numerical and experimental studies through a couple of processes such as theoretical modeling, numerical technique development, computer simulation and model testing.

Related Projects poster:PA13-1
[PA15] Evaluation of sound-field diffuseness in room based on directivity analysis, 2020-.
poster: PA15-1, PA15-2
[PA14] Analysis of low-frequency noise transmission from outdoor into house, 2015-.
poster: PA14-1, PA14-2, PA14-3, PA14-4
[PA13] Acoustic performance prediction of building elements in numerical acoustic test chambers, 2013-.
[PA12] Spatio-temporal analysis of reflected sound structure in room impulse response, 2012-.
[PA11] Numerical prediction of absorption/insulation characteristics of composite materials, 2010-.
poster: PA11-1, PA11-2
[PA10] Foundation of the reverberation theory of non-diffuse sound field, 2010-.
poster: PA10-1, PA10-2
[PA09] Vibro-acoustic modeling for predicting transmission loss of glass panes, 2007-2017.
poster: PA09-1, PA09-2, PA09-3
[PA08] Time-domain sound field analysis using the Constrained Interpolation Profile (CIP) method, 2007-2008.
poster: PA08-1
[PA07] Application of scattering coefficients to ray-based acoustic simulation, 2005-2011.
poster: PA07-1, PA07-2
[PA06] Construction of benchmark platform for wave-based computational methods in architectural/environmental acoustics, 2002-.
website: Benchmark Platform on Computational Methods for Architectural/Environmental Acoustics
[PA05] Numerical evaluation of scattering performance of architectural surfaces, 2002-.
poster: PA05-1, PA05-2
[PA04] Numerical evaluation of attenuation performance of noise barriers for road traffic noise assessment, 2001-2005.
[PA03] Development of the Fast Multipole Boundary Element Method (FMBEM) for large-scale sound field analysis, 1999-.
poster: PA03-1
website: WAON (Acoustic-Analysis Program for An Ultra-Large-Scale Simulation)
[PA02] Aeroacoustic simulation based on computational fluid dynamics regarding noise radiation from building subsidiaries, 1998-2002.
[PA01] Vibro-acoustic simulation on sound insulation performance of building elements, 1996-.

Control & Design of Sound Environment

Techniques on architectural acoustics, electrical acoustics, signal processing etc. are to be efficiently applied to physical control of sound environment, not only by developing individual techniques and materials, but also by establishing integrated design schemes. This section develops active/passive control techniques, optimal design systems, high-performance materials and measurement techniques.

Related Projects
[PB18] Acoustic design and performance evaluation of calm down spaces, 2020-.
poster: PB18-1
[PB17] Study on the guideline of sound absorption design in living spaces, 2018-.
poster: PB17-1, PB17-2
[PB16] Fabrication of acoustic design panels using a numerical control router, 2017-.
[PB15] Development of a measurement method for oblique-incidence absorption coefficient using a thin chamber, 2014-.
poster: PB15-1, PB15-2, PB15-3
[PB14] Development of noise reduction measures for high-rise buildings adjacent to railways, 2012-.
[PB13] Development of layered porous materials with high absorption/insulation performance, 2011-.
[PB12] Development of a room acoustic design scheme based on diffuseness control, 2008-.
poster: PB12-1
[PB11] Analysis of acoustic designs and properties of historical music halls, 2007-.
poster: PB11-1
[PB10] Development of a scale model measurement method for scattering coefficients of wall surfaces, 2007-2017.
poster: PB10-1, PB10-2, PB10-3
[PB09] Investigation into the local placement effect of absorbing surfaces for noise sources in rooms, 2006-2007.
poster: PB09-1
[PB08] Acoustic design of the fully/semi anechoic room in the Environmental Studies Building of the University of Tokyo, 2005-2006.
poster: PB08-1, PB08-2
[PB07] Investigation into outdoor noise propagation to balconies of mid/high-rise apartment buildings, 2004-2007.
[PB06] Designing of architectural surfaces with appropriate scattering performance, 2003-.
poster: PB06-1, PB06-2
[PB05] Investigation into sound reflection characteristics of ceiling reflectors in concert halls, 1999-2000.
[PB04] Investigation into the effect of stage risers on acoustic radiation of lower string instruments, 1998-2002.
[PB03] Investigation into sound absorption characteristics of well-arrayed wall surface and its application to absorbing materials, 1997-1998.
[PB02] Development of lightweight sound insulation structure using mass-loaded thin membranes/plates, 1996-2001.
[PB01] Passive control of modal characteristics of rooms by installing membrane material, 1996-1998.

Evaluation & Understanding of Sound Environment

To keep comfortable sound environment, another approach from the human side is indispensable considering auditory recognition processes, meaning and information of sounds. This section examines the relationship between physical properties of sound environment and psychological/physiological responses of human beings through auditory experiments, and also clarifies the actual state of sound environment by on-site surveys.

Related Projects poster:PC17-1poster:PC16-1, PC16-2poster:PC15-1
[PC17] Elucidation of acoustic characteristics and performer's subjective impressions on stage, 2021-.
[PC16] Investigation into the influence of room acoustics on task disturbance in open-plan offices, 2018-.
[PC15] Field survey and auditory evaluation of sound signals in railway stations, 2016-.
[PC14] Evaluation of sound environment in public spaces using crowd sound field simulation, 2014-.
poster: PC14-1, PC14-2, PC14-3
[PC13] Investigation into the influence of piano directivity on music listening in halls, 2013-.
poster: PC13-1, PC13-2
[PC12] Investigation into the effect of absorbing panels on acoustic quality in meeting rooms, 2012-.
[PC11] Investigation into the auditory effect of diffuseness in room acoustics, 2009-.
poster: PC11-1
[PC10] Investigation into the influence of room acoustics on musical instrument performance, 2008-2011.
poster: PC10-1
[PC09] Development of a learning system with realistic sensation on sound insulation performance, 2007-2010.
poster: PC09-1
[PC08] Investigation into the relationship between human consciousness and memory on sound environment, 2006-2007.
[PC07] Subjective evaluation of sound environment using a multi-channel sound reproduction system, 2006-.
poster: PC07-1
[PC06] Investigation into subjective impressions of indoor equipment noise at low levels, 2003-2006.
[PC05] Investigation into the influence of time variance on subjective impressions of noise transmitted into rooms, 2003-2006.
[PC04] Assessment of the influence of Kashiwa Campus construction on surrounding sound environment, 2000-2006.
[PC03] Development of a sound source database in architectural/environmental acoustics, 2000-2004.
[PC02] Development of subjective notation methods regarding spatial/temporal soundscape, 1999-.
poster: PC02-1, PC02-2
[PC01] Investigation into auditory similarity in room-acoustic impulse responses, 1998-2000.

Integration in Living Environments

In general, living environments are to be considered from multiple aspects with such physical elements as sound, light, heat, air etc., from human aspects such as personal/collective responses, behaviors and communication, and also concerning social norms/morals and cultural contexts. This section deals with integrated problems in living environments and lifestyles, regarding comfortability, health, public spirit and barrier-free space.

Related Projects
[PD17] Elucidation of audio-visual effect of desktop transparent partition on conversation, 2021-.
poster: PD17-1
[PD16] Survey on living and sound environment of people with hyperacusis, 2018-.
poster: PD16-1
[PD15] Survey on child care environment of nurseries in urban areas, 2015-.
poster: PD15-1, PD15-2
[PD14] On-site survey on indoor environments in public buildings of steel structure, 2014-2016.
[PD13] Survey on life feelings of traffic noise influence at houses, 2013-2015.
[PD12] On-site survey on room acoustics and workers' subjective evaluation in coworking space, 2013-.
poster: PD12-1, PD12-2
[PD11] On-site experiment on the improvement of sound environment in open-plan classrooms, 2011-2012.
[PD10] Study on the relationship of speech communication to audio/visual environments, 2008-2009.
[PD09] Investigation on the influence of indoor environments on intellectual productivity in workplace, 2007-.
poster: PD09-1, PD09-2
[PD08] Survey on the application of acoustic items in architectural performance evaluation/indication systems, 2006-2008.
poster: PD08-1
[PD07] Survey on guiding chimes for the visually handicapped at railway stations, 2003-2005.
[PD06] Survey on classroom acoustics for hearing impaired students, 2003-2007.
poster: PD06-1
[PD05] Integrated evaluation of indoor environments in classrooms, 2002-2004.
[PD04] Investigation on human recognition of surrounding information and behavior in cell phone use, 1999-2004.
[PD03] Investigation on consciousness and behavior of aged people at home regarding sound environment, 1999-2001.
[PD02] Examination on acoustic items of housing performance labeling system in Housing Quality Assurance Promotion Law of Japan, 1999-2001.
[PD01] Post-occupancy evaluation of environments in post office buildings, 1999-2000.

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