1,721,030 research outputs found
Methods for product sound design: a correlation between annoyance and sound quality of noise emitted by household appliances
No full textThe sound of a product is now a product parameter that needs the same attention as its concept design. However it is often not known how the subjective assessments and the human factor are taken into account in the procedure governing the studies of sound quality. This case study show how the consumer perception of product sound quality is a fundamental variable to define the sound character. Psychoacoustic metrics like Loudness, Sharpness and Roughness, and the combinations of them into more sophisticated models, like annoyance, pleasantness and powerfulness were used for analysis and prediction of kitchen range hoods sound quality. However, some problems arise when the sounds are analyzed by different consumers. It is assumed that the reason for this is the human not ability to understand the difference between noise and annoyance and to focus consciously or unconsciously on the sound emitted by the appliance. For this reason, the aim of this work is to validate a method for predicting the sound quality produced by five range hoods under reals installation conditions. This was achieved by constructing a series of listening tests suitable for the case study and correlating the sound quality index with perceptual annoyance, to quantify the degree of disturbance obtained in psychoacoustic experiments
Soundscape Approach in the Seaport of Ancona: A Case Study
No full textToday, the art of knowing how to listen is more urgent than ever. The perceptive sound system of the human being is stimulated daily by countless artificial sounds that dominate natural ones. When it comes to the idea of the soundscape, the terminology was initially referred to by composer and environmentalist Raymond Murray Shafer, who defined “soundscape” as a relationship between the ear, humans, built environments, and society. This paper aims to apply the sound landscape approach in the seaport area of Ancona (Italy); a large area, frequented daily by many people, which is divided into passenger and ferry terminals, container terminals, plants for solid bulk, and commercial and recreational activities. The purpose of the study was to evaluate the perception that a human has of the urban layout of the port area by correlating the parameters of traditional acoustics with psychoacoustics. To evaluate the subjective parameters, a questionnaire was developed and applied, enabling the analysis of demographic and behavioral factors such as age, visit frequency, and length of stay of the participants in the clusters of the seaport. This way, it was possible to give an indication of the sound quality of the different clusters of the port area, from an acoustic and emotional point of view, and this information could be particularly helpful in the planning phase of new attractions for the Ancona seaport
Application of the SVM algorithm for the development of a model classification of the visual and sound landscape
No full textTo ensure adequate management of the soundscape in urban environments, urban planning authorities need a range of tools that enable them to perform this condition. Analyzing and classifying a soundscape is necessary to adapt it to the expectations of the people who inhabit it. The term “soundscape” is associated with three different research areas: ecology/anthropology, music/sound design and architecture/urbanism. In particular, in this paper, the third research area will be investigated, finding a correlation model between auditory and visual sensations of the urban landscape of the port of Ancona. The classification model that is used is the Support Vector Machines (SVM) which is proposed as a tool for a global assessment of the urban sound landscape. In this case study the algorithm is intended for the automatic classification of the sound landscape of the port of Ancona to understand how the sound perception affects the visual one
Evaluation of floating floors performances using the reception plate method
No full textThis paper concerns the development and experimental validation of a simplified method to evaluate the performances of materials for floating floors. The method is based on the reception plate theory. The aim of this work is to evaluate the impact sound pressure level reduction by the differences of the sound power level measured on the reception plate with and without the acoustic material. The results are compared with the values measured in accordance with ISO 10140 standards
Application of the SVM algorithm for the development of a model classification of the visual and sound landscape
No full textSound quality evaluation of kitchen hoods
Full text linkThe main goal of present work is to create a comparative evaluation methodology based on the correlation between the objective parameters of traditional acoustics and the psychoacoustic subjective parameters investigated with listening tests. This led to the definition of a quality index for kitchen hoods calculated from measurable objective parameters to provide guidance on the ultimate sound perception of the consumers. The acquisition of data was carried out in a standardized laboratory and in a typical environment representative of a kitchen, in order to study the acoustic behavior of the hood installed and operating in real conditions. For this reason, suitable listening tests have been conducted on a selected group of subjects representing a sample of potential clients of the selected kitchen hood models, with the aim of correlating human sensations and measured objective parameters. Finally, a sound quality index (SQ Index) was calculated for each of the hood models in order to highlight the best performing sample from the point of view of the pleasantness of the sound emitted in the kitchen environment
Double-Skin Façades for Building Retrofitting and Climate Change: A Case Study in Central Italy
Full text linkIn recent years, the need to make the built environment more resilient and adaptable to climate change has become essential. In Europe, this aspect concerns most existing buildings with several deficiencies from the energy efficiency point of view, considering they were designed before the introduction of modern codes. Among the various strategies for building energy retrofitting, Double-Skin Façades (DSFs) have gained attention due to their potential to improve the building performance and inhabitants’ comfort. This research aims to evaluate the use of adequately designed DSFs for the energy restoration of buildings. In detail, various DSF configurations are applied to a residential building located in Central Italy and investigated under present and future climate conditions, estimated through regional climate models. The installation of multi-layered façades, particularly the Multi-Storey typology, greatly reduces energy consumption and increases the expected comfort rates. When the selected configuration was considered, the results underline a decrease in the annual building energy requirement of about 37–56% up to 42–59%, respectively, for 2030 and 2070. Moreover, using multi-layer façades can increase indoor minimum operative temperatures up to 3.8% during the coldest months and reduce the maximum summer ones by 1.9–3.8%, raising comfort levels
Espressione dei recettori attivati dai proliferatori perossisomiali (PPARs) in colture di neuroni corticali
No full textEffetti dell'FGF-2 sull'elettroretinogramma: relazione fra fotoprotezione dei fotorecettori e sensibilità dela retina
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