There have been many experiments regarding reusing plastic bottles, especially polyethylene (PET) as building materials. Some of them are experimenting with their compressive strength as exterior wall bricks (Mansour,...
There have been many experiments regarding reusing plastic bottles, especially polyethylene (PET) as building materials. Some of them are experimenting with their compressive strength as exterior wall bricks (Mansour, et al., 2015); their energy consumption as roof insulations (Racolta, et al., 2016); their compressive and flexural strength as interior walls (Santana, 2016); and their compressive strength as walls and slabs (Oyinlola, et al., 2018). This paper discusses the compressive strength and the flexural strength of PET bottles as structural floor panels. This study explored the positions, binders, patterns, fillers, sizes, and supports of the PET bottles panel to reach the optimum combination of compressive and flexural strength. The experimental result shows that PET bottles panel with an upright position, sealant binder, and sand filler has better compressive strength and flexural strength. It also shows that the panels with more bottles face downwards have better compressive strength, while the ones with more bottles face upwards have better flexural strength. On the other hand, panel with smaller size and higher amount of support shows better flexural strength.
Diffuseness, an important room acoustics parameter, is not easily quantified. Most current methods that attempt to define a single number to describe a room's level of diffuseness require highly specialized equipm...
Diffuseness, an important room acoustics parameter, is not easily quantified. Most current methods that attempt to define a single number to describe a room's level of diffuseness require highly specialized equipment or broad estimations. Multifractals present a recent mathematically robust method that may allow diffuseness to be quantied by analyzing a single room impulse response [S.J. Loutridis, "Quantifying sound-field diffuseness in small rooms using multifractals", JASA (125)(3)(2009)]. This method will be verfied by measuring a room in several states generally considered to affect diffuseness. The method has only thus far been demonstrated in small rooms, and its applicability towards a large concert hall is tested. Frequency dependence is investigated as well as the effects of the measuring location within the room.
The rapid pace of change in the fields of architectural-, physical-, and psycho-acoustics has constantly advanced the graduateprogram in Architectural Acoustics from its inception in 1998 with an ambitious mission of...
The rapid pace of change in the fields of architectural-, physical-, and psycho-acoustics has constantly advanced the graduateprogram in Architectural Acoustics from its inception in 1998 with an ambitious mission of educating future experts and leaders in architectural acoustics. Recent years we have reshaped its pedagogy using “STEM” (science, technology, engineering, and mathematics) methods, including intensive, integrative hands-on experimental components that fuse theory and practice in a collaborative environment. Our pedagogy enables graduate students from a broad range of fields to succeed in this rapidly changing field. The graduateprogram has attracted graduate students from a variety of disciplines including individuals with B.S., B.A., or ***. degrees in Engineering, Physics, Mathematics, Computer Science, Electronic Media, Sound Recording, Music, architecture, and related fields. RPI’s graduateprogram in Architectural Acoustics has since graduated more than 100 graduates with both M.S. and Ph.D. degrees. Along with faculty members they have also actively 0contributed to the program’s research in architectural acoustics, psychoaoustics, communication acoustics, signal processing in acoustics as well as our scientific exploration at the intersection of cutting edge research and traditional architecture/music culture. This paper shares the growth and evolution of the graduateprogram.
The heat reduction effect of trees has been investigated through numerical simulations;however, there are still challenges to applying the scientific results to the planning process due to the model's complexity a...
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architecture has a strong relationship with the daylight universe. It implicates further occupants' behaviour toward visual comforts, healthiness, and energy consumption. The daylight simulation in the early phase...
architecture has a strong relationship with the daylight universe. It implicates further occupants' behaviour toward visual comforts, healthiness, and energy consumption. The daylight simulation in the early phase of design benefits the architect in predicting the possibilities of daylight-related target goals during the design process. A shading system is one of the strategies in approaching passive design to prevent an excessive amount of undesirable daylight intensity. This paper investigates different sun louvers shading patterns and their relation to the Useful Daylight Illuminance (UDI) in the context of Indonesia, presented by incorporating the EPW file of Jakarta. Parametric and multi-objective optimization has been used to optimize, explore, and map the design possibilities based on the louver shading component as dynamic parameters. Rhinoceros and Grasshopper, as parametric-based modelling software, were used as the primary modelling platform, while the Honeybee and Ladybug plugin were used to undergo the daylight-related environmental analysis. The design exploration iterates 2.160 design solutions with a value of dynamic parameters and the targeted UDI value embedded in each. The results show that the solution founded from iteration process has more areas of illuminance within 300 lx to 500 lx by about 15%.
COVID-19 has had a considerable negative influence on subjective well-being. It has also been claimed that a decline in happiness has resulted from forced changes in psychological and attitudinal status (e.g., working...
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This paper presents an experimental study of low‐frequency behavior in coupled volumes. In order to examine low‐frequency behavior in coupled volumes, an eighth‐scale model of two coupled volumes with an automated ...
This paper presents an experimental study of low‐frequency behavior in coupled volumes. In order to examine low‐frequency behavior in coupled volumes, an eighth‐scale model of two coupled volumes with an automated high‐spatial‐resolution scanning system has been developed. The validated scanning system makes it possible to acquire thousands of room impulse responses on a designated planar grid with a fine grid size in the scaled model. The high‐spatial‐resolution scanning results are used to investigate the characteristics of acoustic wave propagation in both single‐space and coupled‐volume systems. This paper discusses some design issues relevant to high‐quality, high‐spatial resolution scanning, to diffusely reflecting interior surfaces, and to variable coupling aperture sizes. Some representative scanning results of sound pressure propagations and sound energy flows will also be demonstrated.
In the fields of architectural-, physical- and psycho-acoustics the pace of change results from research, materials science and professional practice. Integrating the latest advances into pedagogy poses challenges for...
In the fields of architectural-, physical- and psycho-acoustics the pace of change results from research, materials science and professional practice. Integrating the latest advances into pedagogy poses challenges for educators who are charged with training future experts and leaders, many of whom do not have technical backgrounds. To meet this need, the graduateprogram in Architectural Acoustics at the School of architecture at Rensselaer Polytechnic Institute has re-shaped its pedagogy using “STEM” (science, technology, engineering and mathematics) methods enabling individuals from a broad range of fields to succeed in this rapidly changing field. RPI's curricula in architectural acoustics-leading to both M.S. and Ph.D. degrees -includes intensive, integrative hands-on experimental components that fuse theory and practice in a collaborative environment- a “STEM” method. The program has attracted graduate students from a variety of disciplines- including individuals with ***., B.S., or B.A. degrees in architecture, Music, Engineering, Audio/Recording Engineering, Physics, Mathematics, Computer Science, Acoustics, Electronic Media, Theater Technology and related fields. Following completion, most graduates pursue careers in acoustical consulting where an integrated understanding of complex, technical phenomenon is essential. RPI's curricula covers: Architectural Acoustics, Applied Psychoacoustics, Engineering Acoustics, Aural architecture, and Sonics Research Laboratories.
Publications in refereed acoustics journals are of significant relevance for scientists and engineers in acoustics-related fields. The Journal of the Acoustical Society of America (JASA) encourages authors to submit p...
Publications in refereed acoustics journals are of significant relevance for scientists and engineers in acoustics-related fields. The Journal of the Acoustical Society of America (JASA) encourages authors to submit papers to JASA for publication. JASA regularly publishes detailed updated guidelines and instructions in order to help potential authors achieve publishing excellence. As a frequent reviewer, an author of JASA papers, and an Associate Editor of JASA, this author will provide an outline and overview of the JASA peer-review process in order to clarify the standards used to assess both successful and unsuccessful publication efforts. This author also discusses how to prepare qualified manuscripts, how to avoid unnecessary delays for, and how to review manuscripts for JASA.
A model-based design approach for microperforated panel absorbers comprised of multiple panel layers is developed. Microperforated panels (MPPs) are becoming increasingly popular as sound absorbers, capable of providi...
A model-based design approach for microperforated panel absorbers comprised of multiple panel layers is developed. Microperforated panels (MPPs) are becoming increasingly popular as sound absorbers, capable of providing broadband absorption with high absorption coefficients, without the use of traditional porous materials. To increase the bandwidth of the intrinsically peaked narrowband absorption of a single MPP, multiple such panels can be combined into composite sound absorbers. We propose a method based on Bayesian inference to design multilayered MPP absorbers capable of producing a user-specified absorption profile. Using nested sampling to accumulate Bayesian evidence and to implement Occam's razor, the method produces a design requiring the fewest number of MPP layers while meeting the specified design requirements.
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