USE OF CORK SHEETS FOR ROOM ACOUSTIC CORRECTION

2020 ◽  
Vol 15 (2) ◽  
pp. 45-55
Author(s):  
Gino Iannace ◽  
Giuseppe Ciaburro ◽  
Luigi Guerriero ◽  
Amelia Trematerra
Keyword(s):  
Sound Absorption ◽  
Rigid Wall ◽  
Virtual Model ◽  
Rear Wall ◽  
Acoustic Characteristics ◽  
Architectural Acoustics ◽  
Acoustic Comfort ◽  
Useful Life ◽  
Correction System

ABSTRACT Cork is a sustainable material and at the end of its useful life it can be disposed of into the environment without causing damage. This paper analyzes an acoustic correction system made of cork sheets mounted at an opportune distance from the walls inside a room. The cork sheets have a thickness equal to 1.5 mm. The sound absorption coefficients of the cork sheets were initially evaluated by mounting samples inside an impedance tube, then creating a back cavity at a suitable distance from a rigid wall. The distances considered were: 3, 5, 10 and 15 cm. A room used as an office with a volume of about 90 m3 and plastered walls was considered as a case-study. In this type of environment, suitable acoustic comfort conditions are required. The acoustic characteristics were analyzed through a virtual model with an architectural acoustics software in an empty room and then with the introduction of sound-absorbing cork sheets. Measurements of the acoustic characteristics of the empty room were taken and subsequently with the walls lined with cork panels mounted at a distance of 3.0 cm from the rigid rear wall. A configuration was analyzed, in line with what was carried out in the numerical model, covering a surface of 5m2 of the room. The results of the numerical simulations as well as the experimental measurements are discussed.

Green Materials for Sound Absorption

2017 ◽  
Vol 729 ◽  
pp. 63-67 ◽  
Author(s):  
Amelia Trematerra ◽  
Ilaria Lombardi
Keyword(s):  
Sound Absorption ◽  
Flow Resistance ◽  
Noise Pollution ◽  
Acoustic Measurements ◽  
Frequency Range ◽  
Synthetic Materials ◽  
Green Materials ◽  
Acoustic Comfort ◽  
Useful Life ◽  
Materials Used

Green materials are becoming a valid alternative to traditional synthetic materials. The green materials can be used in different fields of the building constructions. The green materials are sustainable, infact the at the end of its useful life they can be dispersed into the environment without damaging it. So the green material can be used in improving the acoustic comfort inside environment, as well as to mitigate noise pollution. In this paper are reported the acoustic measurements of the properties of green materials. The absorption coefficient of samples of the materials, were measured in the frequency range from 200 Hz to 2,000 Hz with an impedance tube (tube of ”Kundt”); the flow resistance was also measured. Furthermore the problems about the realization of sound-absorbing panels composed of green materials, used for the acoustic correction of classroom, were discussed.

Hybrid remaining useful life prediction method. A case study on railway D-cables

2021 ◽  
pp. 107746
Author(s):  
Yu Zang ◽  
Wei Shangguan ◽  
Baigen Cai ◽  
Huasheng Wang ◽  
Michael. G. Pecht
Keyword(s):  
Life Prediction ◽  
Prediction Method ◽  
Remaining Useful Life ◽  
Useful Life

Acoustic comfort evaluation for a conference room: A case study

2017 ◽  
Vol 118 ◽  
pp. 39-49 ◽  
Author(s):  
Abdelghani Gramez ◽  
Fouad Boubenider
Keyword(s):  
Conference Room ◽  
Comfort Evaluation ◽  
Acoustic Comfort

Application of Prognostics and Health Management (PHM) to Software System Fault and Remaining Useful Life (RUL) Prediction

2021 ◽  
Author(s):  
Mohammad Rubyet Islam ◽  
Peter Sandborn
Keyword(s):  
Health Management ◽  
Standard Test ◽  
Remaining Useful Life ◽  
Software Systems ◽  
Prognostics And Health Management ◽  
Performance Parameters ◽  
Statistical Validation ◽  
Useful Life ◽  
Test Beds

Abstract Prognostics and Health Management (PHM) is an engineering discipline focused on predicting the point at which systems or components will no longer perform as intended. The prediction is often articulated as a Remaining Useful Life (RUL). RUL is an important decision-making tool for contingency mitigation, i.e., the prediction of an RUL (and its associated confidence) enables decisions to be made about how and when to maintain the system. PHM is generally applied to hardware systems in the electronics and non-electronics application domains. The application of PHM (and RUL) concepts has not been explored for application to software. Today, software (SW) health management is confined to diagnostic assessments that identify problems, whereas prognostic assessment potentially indicates when in the future a problem will become detrimental to the operation of the system. Relevant areas such as SW defect prediction, SW reliability prediction, predictive maintenance of SW, SW degradation, and SW performance prediction, exist, but all represent static models, built upon historical data — none of which can calculate an RUL. This paper addresses the application of PHM concepts to software systems for fault predictions and RUL estimation. Specifically, we wish to address how PHM can be used to make decisions for SW systems such as version update, module changes, rejuvenation, maintenance scheduling and abandonment. This paper presents a method to prognostically and continuously predict the RUL of a SW system based on usage parameters (e.g., numbers and categories of releases) and multiple performance parameters (e.g., response time). The model is validated based on actual data (on performance parameters), generated by the test beds versus predicted data, generated by a predictive model. Statistical validation (regression validation) has been carried out as well. The test beds replicate and validate faults, collected from a real application, in a controlled and standard test (staging) environment. A case study based on publicly available data on faults and enhancement requests for the open-source Bugzilla application is presented. This case study demonstrates that PHM concepts can be applied to SW systems and RUL can be calculated to make decisions on software version update or upgrade, module changes, rejuvenation, maintenance schedule and total abandonment.

scholarly journals Analysis of Acoustic Comfort - Classroms Campus Santa Mônica: Case Study

2016 ◽  
Vol 6 ◽  
Author(s):  
Paulo Henrique dos Santos ◽  
Dogmar Antonio de Souza Júnior ◽  
Antonio Carlos dos Santos
Keyword(s):  
Santa Monica ◽  
Acoustic Comfort

É cada vez maior a necessidade de atender as exigências dos usuários quanto ao conforto acústico nos mais diversos tipos de edificações. Considerando as atividades desenvolvidas em salas de aula e o que representam para o futuro de uma sociedade, a preocupação com o conforto destas salas na fase de projeto deveria ser ainda maior. Este artigo tem como objetivo apresentar os resultados da análise do conforto acústico de salas de aula de dois prédios do Campus Santa Mônica da Universidade Federal de Uberlândia – UFU. Foram realizados estudos quanto a capacidade de absorção dos materiais e o tempo de reverberação de seis salas de aula, sendo três em cada prédio. Os resultados obtidos na análise foram comparados com os parâmetros normativos das normas ANSI S12.60:2010 e ABNT NBR 12179:1992, a fim de verificar se as salas apresentavam condições adequadas para as atividades de ensino-aprendizagem. Para tanto, após coleta de dados em campo foi determinado analiticamente os parâmetros de absorção sonora e tempo de reverberação. Foi constatado nesta condição as salas atendem as exigências normativas.

scholarly journals Application of transparent microperforated panel to acrylic partitions for desktop use: A case study by prototyping

2021 ◽  
Author(s):  
Kimihiro Sakagami ◽  
Midori Kusaka ◽  
Takeshi Okuzono ◽  
Shigeyuki Kido ◽  
Daichi Yamaguchi
Keyword(s):  
Adverse Effect ◽  
Sound Absorption ◽  
Acoustic Environment ◽  
Actual Use ◽  
Acrylic Sheet ◽  
Absorption Performance ◽  
The Subject ◽  
Droplet Penetration ◽  
Absorption Characteristics

There are various measures currently in place to prevent the spread of COVID-19; however, in some cases, these can have an adverse effect on the acoustic environment in buildings. For example, transparent acrylic partitions are often used in eating establishments, meeting rooms, offices, etc., to prevent droplet infection. However, acrylic partitions are acoustically reflective; therefore, reflected sounds may cause acoustic problems such as difficulties in conversation or the leakage of conversation. In this study, we performed a prototyping of transparent acrylic partitions to which a microperforated panel (MPP) was applied for sound absorption while maintaining transparency. The proposed partition is a triple-leaf acrylic partition with a single acrylic sheet without holes between two MPP sheets, as including a hole-free panel is important to a possible droplet penetration. The sound absorption characteristics were investigated by measuring the sound absorption in a reverberation room. As the original prototype showed sound absorption characteristics with a gentle peak and low values due to the openings on the periphery, it was modified by closing the openings of the top and sides. The sound absorption performance was improved to some extent when the top and sides were closed, although there remains the possibility of further improvement. This time, only the sound absorption characteristics were examined in the prototype experiments. The effects during actual use will be the subject of future study.

scholarly journals Interaction of landscape space and indoors in architecture of the open-air concert hall “Mitava”

2021 ◽  
Vol 17 ◽  
pp. 55-67
Author(s):  
Aija Grietena
Keyword(s):  
Interdisciplinary Collaboration ◽  
Building Structures ◽  
Acoustic Characteristics ◽  
Concert Hall ◽  
Emotional Quality ◽  
Indoor Space ◽  
The Baltic ◽  
Wooden Structures

In the search for balancing factors in the art of environmental design between architecture, landscape architecture, and interiors needed to improve interdisciplinary collaborative planning and enhance the psycho-emotional quality of the environment, the study of landscape space-indoor interaction through comparative analysis and inductive reference is continued. On the Latvian scale, the new, 21st-century technological capabilities in the design and production of wooden structures in the architecture of the open air concert hall “Mītava”, constructed in 2019 on Pasta Island. The importance of the structure on the Baltic scale is emphasized by the unique design, which resembles a shell washed on the bank of the Lielupe River, large (<60m) arched timber continuous roof structures and high acoustic characteristics. Original building structures have opened up new opportunities for interaction between landscape space and indoor space, creating a broad, spatial synthesis. The realization of an artistically stylistic concept in the open-air concert hall “Mītava”, which is subordinated to the existing landscape space and supplemented with appropriate greenery, is considered a valuable contribution to the urban environment. The specific case study analyzed in detail underlines the importance of successful interdisciplinary collaboration in the harmonious interaction between landscape space and indoor.

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