CANARINA:
CUSTIC:
Barreira acústica
· software · barreira acústica
Barreiras acústicas:
(2) acima - receptor (sem perda de som) e abaixo - receptor (com perda de som)
(3) Barreira
(4) Região Sombra
(5) Direto
(6) Difração
|
Material |
Espessura (Thickness) |
Densidade (Surface Density) kg/m2 |
Atenuação da barreira (Transmission Loss), dB (A) |
|
Policarbonato (Polycarbonate) |
8-12 |
10-14 |
30-33 |
|
Acrilico (Acrylic -Poly-Methyl-Meta- Acrylate (PMMA)-) |
15 |
18 |
32 |
|
Hormigón 200x200x400 ligero (Concrete Block 200x200x400 light weight) |
200 |
151 |
34 |
|
Hormigón pesado (Dense concrete) |
100 |
244 |
40 |
|
Hormigón ligero (Light concrete) |
150 |
244 |
39 |
|
Hormigón ligero (Light concrete) |
100 |
161 |
36 |
|
Ladrillo (Brick) |
150 |
288 |
40 |
|
Acero (Steel), 18 ga |
1.27 |
9.8 |
25 |
|
Acero (Steel), 20 ga |
0.95 |
7.3 |
22 |
|
Acero (Steel), 22 ga |
0.79 |
6.1 |
20 |
|
Acero (Steel), 24 ga |
0.64 |
4.9 |
18 |
|
Lámina de aluminio (Aluminium Sheet) |
1.59 |
4.4 |
23 |
|
Lámina de aluminio (Aluminium Sheet) |
3.18 |
8.8 |
25 |
|
Lámina de aluminio (Aluminium Sheet) |
6.35 |
17.1 |
27 |
|
Madera (Wood) |
25 |
18 |
21 |
|
Conglomerado (Plywood) |
13 |
8.3 |
20 |
|
Conglomerado (Plywood) |
25 |
16.1 |
23 |
|
Paneles con poliester y metal (Absorptive panels with polyester film backed by metal sheet) |
50-125 |
20-30 |
30-47 |
|
* (Sem
furos
ou aberturas
nas barreiras
(*
Values assuming no openings or gaps in the barriers)
|
|||
Uma barreira:
A partir de 4 barreras, el cálculo converge. Usamos el mismo modelo que la ciudad de Londres y de Hong Kong.
Aviso importante: o comando TOPOGRAFIA não considera a reflexão do som (o comando considera só a altura da fonte). Tenha cuidado para não usar as duas funções ao mesmo tempo.
6.1 The Highways Agency (1994) Design Manual for Roads and Bridges, Volume 10, Environmental Design, Section 5, Environmental Barriers, Part 1, Design Guide for Environmental Barriers, HMSO, London.
6.2 The Highways Agency (1995) Design Manual for Roads and Bridges, Volume 10, Environmental Design, Section 5, Environmental Barriers, Part 2, Environmental Barriers: Technical Requirements, HMSO, London.
6.3 The Highways Agency (1994) Manual of Contract Documents for Highway Works Volume 1 Specification for Highway Works Series 2500 Special Structures
6.4 U.S. Department of Transportation Federal Highway Administration (1976) A Guide to Visual Quality in Noise Barrier Design. California Department of Transportation (1997) Technical Noise Supplement 1st Draft
6.6 Benz Kotzen and Colin English (1998) Environmental Noise Barriers: A Guide to their Acoustic and Visual Design,E & FN Spon, London
6.7 David C Hothersall and Richard J Salter (1977) Transport and the Environment, Crosby Lockwood Staples, London
6.8 Ian Sharland (1986) Woods Practical Guide to Noise Control, Woods of Colchester Limited
6.9 Environmental Protection Department, Application of Screening Structure to Abate Noise from Surface Transportation, Environmental Protection Department, Hong Kong
6.10 Environmental Protection Department (2000) Housing Design to Abate Traffic Noise in Hong Kong, Environmental Protection Department, Hong Kong
6.11 Environmental Protection Department (2001) Screening Structures and Building Designs against Transportation Noise in Hong Kong, Environmental Protection Department, Hong Kong
6.12 Hong Kong Government (1991) Environmental Guidelines for Planning in Hong Kong, an Extract from the Hong Kong Planning Standards & Guidelines
6.13 Hong Kong Government (1997) Environmental Impact Assessment Ordinance
6.14 Hong Kong Government (1997) Technical Memorandum on Environmental Impact Assessment Process
6.15 Highways Department (2001) Particular Specification for Noise Barriers, Highways Department, Hong Kong
6.16 Highways Department (2002) Final Report of the Noise Enclosure Lighting - Engineering Study, Highways Department, Hong Kong
barreiras acústicas
CUSTIC: CUSTIC · ruído e poluiçao sonora - Vantagens · ruído e poluiçao visual - Aplicações · poluição sonora
GRÁFICOS I: 3D · atenuadores de ruído - Topografía · poluição ambiental sonora - Gráficos · poluição ambiental
GRÁFICOS II: Gráficos II · engenharia · ruído industrial - Mapas Google · mapa ruído - SIG · destruição do meio ambiente
RUÍDO: Ruído · construção civil - Nivel de ruído · vibração · isolação
ALGORITMOS: Algoritmos I · segurança do trabalho - Algoritmos II · poluição industrial · poluição urbana
DADOS: Dados I · isolamento acústico - Dados II · meio ambiente - Dados III · preservação do meio ambiente
FUNÇOES I: Funçoes · projeto do meio ambiente - barreiras acústicas
FUNÇOES II: Importar · proteção ao meio ambiente - Média · degradação do meio ambiente