This paper will discuss conceptual fundamentals that will support a thesis research. This thesis discusses the incorporation of BIM into the digital architecture design process and proposes to analyze an alternative u...
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Factor analysis of semantic differential data, with forty-eight cases of collegiate lecture rooms psychologically assessed by students during regular classes, has established that distance evaluation forms diagonal co...
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Factor analysis of semantic differential data, with forty-eight cases of collegiate lecture rooms psychologically assessed by students during regular classes, has established that distance evaluation forms diagonal coordinates together with overall evaluation. Multiple regression analysis has then explained psychological distance in five variables: room depth, natural lighting, illumination, window-opening ratio and student density. The ratio of room depth to breadth and main window area on both sides are also explanatory variables, supporting hypotheses of tunnel effect and window-frame rhythms as increasing factor. A multiple-regression equation explaining 69.4% of variance has revealed that 100-180 lx increase of illumination should compensate 1.8m decrease in room depth.
Subjective experiment was conducted to identify the relationship between brightness sensation and the percentage of the subjectswho turned on the ceiling luminaire in an experimental room which introduced diffused dir...
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Subjective experiment was conducted to identify the relationship between brightness sensation and the percentage of the subjectswho turned on the ceiling luminaire in an experimental room which introduced diffused direct sunlight by using reflecting panelbeside the window. Brightness sensation judged by the subjects just after they entered the room with diffused direct sunlight became higher than that without diffused direct sunlight. However diffused direct sunlight introduced into the room had no significant effects on the subjects' brightness sensation judged after they stayed in the room for 5 minutes. It was also identified that in the case when the illuminance on the desk was higher than about 200-400 lx, half of the subjects turned off the ceiling luminaire.
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.
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.
This paper compares two numerical models: diffusion equation model and transport equation model, for room‐acoustic predications in long spaces. Mathematically, the diffusion equation is the asymptotic approximation t...
This paper compares two numerical models: diffusion equation model and transport equation model, for room‐acoustic predications in long spaces. Mathematically, the diffusion equation is the asymptotic approximation to the transport equation, therefore is expected to be less accurate. In addition, the transport equation intrinsically includes the direct sound field while the diffusion equation does not. However, due to its simple form of the diffusion equation, it has certain computational advantages over the transport equation model, e.g., it is less computationally expensive. When comparing the two models with the ray‐tracing based method, the transport equation is shown to be more precise, especially when the walls are highly absorptive. Nevertheless, the diffusion equation model performs fairly well provided that the absorption on the walls is low. In this case, the diffusion equation model might be preferred over the transport equation model due to a low computational load.
There are currently two methods to measure the diffusion / scattering from acoustical surfaces: reverberation chamber measurement and in-situ measurement using a semicircular array of microphones called a goniometer. ...
There are currently two methods to measure the diffusion / scattering from acoustical surfaces: reverberation chamber measurement and in-situ measurement using a semicircular array of microphones called a goniometer. Each of these methods has advantages and drawbacks. The reverberation chamber method accounts for random incidence, but produces inconsistent results for materials of the same profile but different absorption. It does not distinguish between one-dimensional and two-dimensional surface topologies, since the sample is rotated, and is also inapplicable to high absorption materials. The goniometer measurement quantifies directivity as well as diffusion, but presents challenges related to processing power, as many microphones are required to achieve reasonable resolution. Using a procedure akin to synthesized aperture radar, a 2.5 deg. resolution polar plot of the 180 deg. response is achieved by scanning eight microphones rather than employing a full array of 72. Also, since the direct sound and reflected sound arrive at the receiver in close succession when measuring low incident angles, special processing must be exercised in order to resolve the relationship between the sounds. This research addresses the challenges of the goniometer measurement and attempts to use a synthesized aperture goniometer to derive accurate diffusion and directivity properties of materials.
Even though a large variety of innovative façade technologies has been developed to refine the control of solar radiation and increase the amount of useful natural illumination, their effective implementation in ...
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ISBN:
(纸本)9781905254347
Even though a large variety of innovative façade technologies has been developed to refine the control of solar radiation and increase the amount of useful natural illumination, their effective implementation in buildings is still uncommon. Increasing the awareness of designers to their existence and facilitating an understanding of their potential thus appears as a priority. An important step in that direction is to make the search and selection process more intuitive. This paper proposes a way to address this issue with a new database format. It focuses on the generation of visual strategies to express technical aspects and performance data with a more intuitive and architecturally based language, adapted to a designer's needs and respectful of a realistic design process. The project takes shape as a freely accessible online database of light-interacting technologies for envelopes, available at ***, that provides an efficient meeting space for professionals in the field.
In this paper, a three‐dimensional transport equation model is first presented to describe the sound energy propagation in a long space. Then the three‐dimensional model is reduced to a one‐dimensional model by app...
In this paper, a three‐dimensional transport equation model is first presented to describe the sound energy propagation in a long space. Then the three‐dimensional model is reduced to a one‐dimensional model by approximating the solution using the method of weighted residuals. The one‐dimensional transport equation model directly describes the sound energy propagation in the long dimension and deals with the sound energy across the cross‐section by prescribed functions. The one‐dimensional transport equation model consists of a coupled set of N transport equations. Only N = 1 and N = 2 are discussed in this paper. For larger N, although the accuracy could be improved, the calculation time is expected to be significantly longer, which diminishes the advantage of the one‐dimensional model over the three‐dimensional model in terms of the computational efficiency. Some simulation results are provided in comparison with the ray‐tracing based approach, which show good agreement.
With growing environmental consciousness and the use of petroleum based products in the production of fiber reinforced polymer (FRP) composites arises an increased opportunity to use renewable bio-based polymers and f...
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ISBN:
(纸本)9781605604787
With growing environmental consciousness and the use of petroleum based products in the production of fiber reinforced polymer (FRP) composites arises an increased opportunity to use renewable bio-based polymers and fibers towards the fabrication of Natural Fiber Reinforced BioPolymers (NFRbP). Towards this, theoretical estimates of the tensile, flexural and compressive properties of NFRbP sections were made using varied published properties and comparatively assessed versus a steel baseline. From the publicized documentation of professional associations, and the research of both Commercial and Academic leaders, this study presents a comparative analysis of strength properties and life-cycle benefits of both green and petroleum based pultruded composite sections over typical construction methods.
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