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Model of a benefit/cost ratio analysis for comparison of environmental noise ba...

The choice for an economically ideal solution of environmental noise barrier must acknowledge both the cost of its main components and the benefits it can provide, through time. An algorithm based on benefit/cost ratio (BCR) analysis was created to achieve a systematic analysis tool. It calculates the BCR for any potential noise barrier. The cost of a barrier can be described with known or quantifiable paramete...

Sound isolation provided by shading screens applied in façades

In most European countries, legislation exists about airborne sound insulation in dwellings, including facades. Mainly in southern Europeans countries, the glazed windows of building facades normally have shading systems to minimize the excessive heating of interior rooms due to the solar rays’ incidence and to provide for darkening of the room. The effect regarding sound isolation of those shading system...

Acoustical characterization of portuguese libraries

This paper presents the acoustical characterization of the main reading room of 28 public li-braries in Portugal. In situ measurements were held regarding the interior sound pressure lev-els (background noise, with and without the HVAC equipment working), the Noise Criteria and Noise Rating values (NC/NR), the objective speech intelligibility using the Rapid Speech Transmission Index (RASTI) and Reverberation T...

Living with high noise levels, is it sustainable?

Sound, noise and speech at the 9000-seat Holy Trinity Church in Fatima, Portugal

This paper presents the interior acoustical characterization of the 9,000-seat church of the Holy Trinity in the Sanctuary of Fátima, Portugal, inaugurated in 2007. In situ measurements were held regarding interior sound pressure levels (with and without the HVAC equipment working), NC curves, RASTI (with and without the installed sound system) and reverberation time. The results are presented and commented acc...

Sound, noise and speech at the 9000-seat Holy Trinity Church in Fatima, Portugal

This paper presents the interior acoustical characterization of the 9,000-seat church of the Holy Trinity in the Sanctuary of Fátima, Portugal, inaugurated in 2007. In situ measurements were held regarding interior sound pressure levels (with and without the HVAC equipment working), NC curves, RASTI (with and without the installed sound system) and reverberation time. The results are presented and commented acc...

Squealing noise in light rail transport systems: Implications in noise mapping

Squealing noise is generated by railway vehicles riding through curves having closed radius. It is a result of wheels sliding on the rail when they negotiate a curve. This kind of noise is very annoying for people living in the surrounding areas where this phenomenon occurs because it has a characteristic spectrum that is dominated by discrete frequency components. Usually, squeal noise is not correctly account...

Squealing noise in light rail transport systems: Implications in noise mapping

Squealing noise is generated by railway vehicles riding through curves having closed radius. It is a result of wheels sliding on the rail when they negotiate a curve. This kind of noise is very annoying for people living in the surrounding areas where this phenomenon occurs because it has a characteristic spectrum that is dominated by discrete frequency components. Usually, squeal noise is not correctly account...

Investment in noise reduction : a good option in Portugal?

In Portugal like in the majority of European countries, a significant part of the population is exposed to excessive traffic noise levels which are downgrading their quality of life. Considering the relevance of this topic associated with a constant growth in road traffic volume and congestion, it was recognized the importance of the economical valuation of these severe noise levels. This paper aims to present ...

Relationship between acoustic worship ambience and speech intelligibility in Go...

The acoustic worship ambience in the church is defined through the derived Acoustic Worship Indices (AWI), namely Sacred Factor (SaF), Intelligibility Factor (InF) and Silence Factor (SiF). The Speech Intelligibility in the church was evaluated through RASTI tests for different sound source locations (altar [SA], pulpit [SB] and high altar [SC]) and for different postures (sitting [SIT] and standing [STAND]) an...