Deflection of Resilient Materials for Reduction of Floor Impact Sound

Recently, many residents living in apartment buildings in Korea have been bothered by noise coming from the houses above. In order to reduce noise pollution, communities are increasingly imposing bylaws, including the limitation of floor impact sound, minimum thickness of floors, and floor soundproofing solutions. This research effort focused specifically on the deflection of resilient materials in the floor sound insulation systems of apartment houses. The experimental program involved conducting twenty-seven material tests and ten sound insulation floating concrete floor specimens. Two main parameters were considered in the experimental investigation: the seven types of resilient materials and the location of the loading point. The structural behavior of sound insulation floor floating was predicted using the Winkler method. The experimental and analytical results indicated that the cracking strength of the floating concrete floor significantly increased with increasing the tangent modulus of resilient material. The deflection of the floating concrete floor loaded at the side of the specimen was much greater than that of the floating concrete floor loaded at the center of the specimen. The Winkler model considering the effect of modulus of resilient materials was able to accurately predict the cracking strength of the floating concrete floor.

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Impact resistance of external thermal insulation systems

MATEC Web of Conferences ◽

10.1051/matecconf/201816308004 ◽

2018 ◽

Vol 163 ◽

pp. 08004 ◽

Cited By ~ 1

Author(s):

Ewa Sudoł ◽

Dawid Dębski ◽

Renata Zamorowska ◽

Barbara Francke

Keyword(s):

Thermal Insulation ◽

Impact Resistance ◽

Experimental Program ◽

Insulation Material ◽

Test Results ◽

Composite Systems ◽

Factors Influencing ◽

Insulation Systems ◽

The Impact ◽

Fibre Mesh

In the paper the results of an experimental program intended to determine factors influencing the impact resistance of the External Thermal Insulation Composite Systems (ETICS) were presented. For the research the systems based on polystyrene have been chosen. The insulation material was faced with a rendering consisting of base coat reinforced with standard or armored glass fibre mesh and silicone or silicone-silicate binders as finishing coats. The influence of various renderings components was evaluated with respect to resistance to hard body impact and resistance to hail. The test results were discussed in the context of the possible impact level on ETICS in use.

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SYSTEM MODELING BY A NEO-FUZZY-NEURON WITH APPLICATIONS TO ACOUSTIC AND CHAOTIC SYSTEMS

International Journal of Artificial Intelligence Tools ◽

10.1142/s021821309500005x ◽

1995 ◽

Vol 04 (01n02) ◽

pp. 73-91 ◽

Cited By ~ 6

Author(s):

EIJI UCHINO ◽

TAKESHI YAMAKAWA

Keyword(s):

System Modeling ◽

Chaotic Signal ◽

Sound Insulation ◽

Target System ◽

Generalization Capability ◽

New Approach ◽

Future Behavior ◽

Insulation Systems ◽

Nonlinear Chaotic System ◽

Actual Effectiveness

This paper describes a new approach to system modeling by using a neo-fuzzy-neuron. The target system is modeled adaptively by simply feeding its input and output data to the neo-fuzzy-neuron, whose basic principle was proposed by the authors in 1992. Firstly, the neo-fuzzy-neuron is applied to the restoration of a saturated and/or intermittent speech or chaotic signal to show its actual effectiveness. It is then enhanced in order to get a better generalization capability. The enhanced version of the neo-fuzzy-neuron could facilitate to identify clearly the nonlinear chaotic system, and could most likely predict the future behavior of the system. The neo-fuzzy-neuron was further applied to the identification of actual sound insulation systems. The application was a success and provided promising results.

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A practical and probabilistic evaluation method of sound insulation systems based on the extended regression analysis for roughly observed data.

Journal of the Acoustical Society of Japan (E) ◽

10.1250/ast.19.391 ◽

1998 ◽

Vol 19 (6) ◽

pp. 391-396

Author(s):

Noboru Nakasako ◽

Yasuo Mitani ◽

Mitsuo Ohta

Keyword(s):

Regression Analysis ◽

Evaluation Method ◽

Sound Insulation ◽

Probabilistic Evaluation ◽

Insulation Systems

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Effect of Thickness and Perforation Size on the Acoustic Absorption Performance of a Micro-Perforated Panel

MATEC Web of Conferences ◽

10.1051/matecconf/202133503016 ◽

2021 ◽

Vol 335 ◽

pp. 03016

Author(s):

Yi-San Wong ◽

Vignesh Sekar ◽

Se Yong Eh Noum ◽

Sivakumar Sivanesan

Keyword(s):

Absorption Coefficient ◽

Urban Areas ◽

Sound Absorption ◽

Rapid Development ◽

Noise Pollution ◽

Sound Absorption Coefficient ◽

Sound Insulation ◽

Acoustic Absorption ◽

Psychological Disturbance ◽

Absorption Performance

In current times, noise pollution is especially apparent in urban areas due to rapid development in transportation, industrialization, and urbanization. The worsening noise pollution is detrimental to human health and behaviour as it can contribute to disorders and psychological disturbance. Thus, noise regulation is crucial and must be addressed with immediate effect. Micro-perforated panels (MPP) can be a potential solution to mitigate noise on a commercial scale. Researchers have addressed the mechanics behind the enhancement of acoustic absorption through micro-perforation and some suggestions have been made, such as the effect of structural variation on sound absorption performance. Hence, this research aims at optimizing the sound absorption performance of an MPP by determining the connection between thickness and perforation size with sound absorption coefficient. Three cases were considered: (i) varying perforation size, (ii) varying thickness, and (iii) varying perforation size and thickness simultaneously. Based on the Maa prediction model, the sound absorption performance for all three cases have been simulated through the MATLAB software. Results show that the increase in both thickness and perforation size together increases the peak value of sound absorption coefficient (SAC). It also shifts the peak towards the higher frequency region and narrows the bandwidth. The findings of this study indicate the potential of thick MPPs as commercial sound absorbers by adjusting the size of perforations. Thicker and sturdier MPPs with optimal acoustic resistance and reactance can act as reliable sound absorbers for sound insulation purposes.

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Two Identification and Prediction Methods for the Stochastic Evaluation of Sound Insulation Systems Based on Criterion of Mutual Information between Conditioned Input Level and Output Data

Proceedings of the ISCIE International Symposium on Stochastic Systems Theory and its Applications ◽

10.5687/sss.1996.1 ◽

1996 ◽

Vol 1996 (0) ◽

pp. 1-6

Author(s):

Hiroshi Yamada ◽

Mitsuo Ohta

Keyword(s):

Mutual Information ◽

Sound Insulation ◽

Prediction Methods ◽

Output Data ◽

Insulation Systems ◽

Input Level

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Analysis of Sound Insulation Performance of Reinforce Concrete Walls between Households According to Wall Thickness Criteria in Apartments

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.873.237 ◽

2017 ◽

Vol 873 ◽

pp. 237-242

Author(s):

Hye Kyung Shin ◽

Kyoung Woo Kim ◽

A Yeong Jeong ◽

Kwan Seop Yang

Keyword(s):

Reinforced Concrete ◽

Wall Thickness ◽

Field Measurements ◽

Reinforce Concrete ◽

Sound Insulation ◽

Concrete Wall ◽

Minimum Thickness ◽

Concrete Walls ◽

Reinforced Concrete Wall ◽

Insulation Performance

Sound insulation between households is properly ensured to provide a quiet residential environment in apartments. The legal requirements for sound insulation in apartments in Korea are set to meet the wall’s minimum thickness or sound insulation performance. When construction companies choose the walls that satisfy thethickness in the standards of boundary walls between households, it is difficult to know the sound insulation performance. In this study, the sound insulation performance of reinforced concrete walls is predicted according to the wall thickness criteria and analyzed through field measurements. In newly built apartments, the reinforced concrete wall’s sound insulation performance(R'w) is 56 – 66 dB, which is a similar level of the international criterion. And the sound insulation performance of the reinforced concrete wall according to thickness standards is similar to sound insulation performance standardsof Korea.

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Environmental Effects on Squatter Settlement: A Case of Alagbede Village, Lagos, Nigeria

LAUTECH Journal of Civil and Environmental Studies ◽

10.36108/laujoces/1202.70.0110 ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

D. O Adeoye

Keyword(s):

Land Use ◽

Research Effort ◽

Research Work ◽

Drainage System ◽

Secondary Data ◽

Noise Pollution ◽

Related Factors ◽

Healthy Environment ◽

Lagos State ◽

Basic Infrastructure

Healthy housing is a function of provision of adequate physical, social and mental conditions for healthy environment. It is a function of both intrinsic and extrinsic attributes of housing that can influence human health. Environment and human activities are omen to development. The effects are manifested in generating land use problems such as congestion, sprawl development, incompatible land uses, building alterations and change of uses, the menace of temporary structures, alteration of land use functions, conversion of open and future spaces, and land degradation. Alagbede village is one of the areas that require such development drive. The study is required to facilitate this need. This research effort is to examine the environmental effect of squatter settlements in Alagbede village, Ikeja, Lagos State Nigeria. The paper examined housing conditions in terms of privacy, adequate space, physical accessibility, adequate security, security of tenure, structural stability and durability, adequate lighting, and ventilation, and basic infrastructure (such as water supply, sanitation, and waste management facilities including suitable environmental quality and health related factors and its influence on the residents of Alagbede area, Ikeja Lagos State. Approach includes the development of database and choice of appropriate data source (primary and secondary data sources). From the methodology, there were questionnaire administration, direct interview of respondents, collection and updating of the base maps, and the use of necessary field instrument for the study. The data gathered were analysed using descriptive method. The end result has revealed a number of environmental problems due to the existence of these settlements (Alagbede village). These problems are poor drainage system, noise pollution, illegal refuse dump sites, slum situations etc. Appropriate recommendations in form of short time and long term solutions were suggested to conclude the research work.

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Development of Out-Wall External Thermal Insulation System Based on Rock-Wool

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.174-177.1589 ◽

2012 ◽

Vol 174-177 ◽

pp. 1589-1592

Author(s):

Ming Gang Xu ◽

Xu Wang ◽

Zhuo Wei Ding

Keyword(s):

Thermal Insulation ◽

Thermal Conductivity Coefficient ◽

Outer Wall ◽

Sound Insulation ◽

Insulation System ◽

Stable Chemical ◽

Insulation Systems ◽

Saving Measure ◽

Insulation Performance ◽

Rock Wool

The outer-wall thermal insulation system has been wide used in civil engineering as an effective energy-saving measure. At present, the organic flammable thermal insulation materials such as EPS and XPS are used in outer-wall thermal insulation system in China, which leads to great fire damage probably. The rock-wool is described in detail on its merits such as good thermal insulation performance, good sound insulation performance, light weight, low thermal conductivity coefficient, incombustibility, innocuity and stable chemical capability. Two popular outer-wall external thermal insulation systems are introduced. The construction sequence of the outer-wall external thermal insulation system with rock-wool slabs, mortar and thin layer plastering technology is described.

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Evaluation of select warm mix additives with polymer and rubber modified asphalt mixtures

Canadian Journal of Civil Engineering ◽

10.1139/cjce-2013-0512 ◽

2015 ◽

Vol 42 (6) ◽

pp. 377-388 ◽

Cited By ~ 10

Author(s):

Zahi Chamoun ◽

Mena I. Souliman ◽

Elie Y. Hajj ◽

Peter Sebaaly

Keyword(s):

Fatigue Testing ◽

Research Effort ◽

Fatigue Cracking ◽

Moisture Damage ◽

Asphalt Mixtures ◽

Asphalt Binders ◽

Experimental Program ◽

Modified Asphalt ◽

Warm Mix Additives ◽

The Impact

Warm mix technologies are being increasingly investigated in an effort to conserve energy, reduce emissions, and extend paving season. Most of the laboratory research conducted to date on warm mix technologies has been concentrated on studying the impact of warm mix technologies on unmodified asphalt binders. This research effort evaluates the use of select warm mix additives with unmodified, polymer-modified, and terminal blend tire rubber asphalt mixtures from Nevada and California. The study evaluated two different warm mix asphalt (WMA) technologies: Sasobit and Advera. The experimental program evaluated the resistance to moisture damage and rutting of different mixtures with and without liquid anti-strip and lime. Additionally, fatigue resistance of modified and unmodified asphalt mixtures without anti-strip was conducted. In this research effort, the unmodified WMA mixtures were able to achieve mixing temperature reductions of 26.7 to 29.4 °C while the modified WMA mixtures were able to achieve mixing temperature reductions of 16.7 to 25.0 °C compared to their corresponding HMA control mixtures. The results showed that the use of modified binders with WMA technologies and anti-strip additives can result in mixtures with a better resistance to moisture damage compared to unmodified mixtures. Additionally, the combination of modified asphalt binders with lime will eventually generate better resisting mixtures to permanent deformation. Moreover, the resistance to fatigue cracking of HMA and WMA mixtures was also enhanced using modified asphalt binders. Furthermore, a mechanistic fatigue analysis using 3D-Move software confirmed the outcomes of fatigue testing.

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