About Us  Services       . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    Noise Control for Industrial Facilities       Petrochemical Facilities       Desalination Plants       Gas Treatment Facilities       Pulp and Paper Mills       Mining Operations       Quarries & Landfills       Steel Mills & Aluminum Smelters       . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    Noise Control for Power Plants       Wind Turbine Plants       Combined Cycle Plants       Simple Cycle Plants       Diesel Generators       Oil, Coal & Gas Fired Plants       HRSG's       Air Cooled Condensers       General Plant Components       . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    Noise Control for Architectural     & Commercial Applications       . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    Environmental Noise Assessments       . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    Noise Modeling Capabilities       »  Sound Propagation Calculations       Model Input Development       Ex 1 - Simple Cycle Power Plant       Ex 2 - Gas Treatment Facility       Ex 3 - Combined Cycle Power Plant       Ex 4 - Quarry       Ex 5 - Wind Turbine       . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  Projects  Clients  Publications  Staff  Contact Us Model Sound Propagation Calculations Modeling consists of entering sound power levels to represent each significant source of noise associated with a given project and then calculating the total sound pressure level that results from all these sources acting together at one or more distant points of interest. The calculations from source input level to receptor output level require the consideration of a number of factors, such as: » Source Type (Point, Area, Line, etc.) » Distance Loss » Atmospheric Air Absorption Losses » Ground Interaction Effects » Blockage from Other On-site Structures or Equipment » Losses from Intervening Trees or other Off-site Obstructions » Losses from Noise Barriers or Berms » Potential Losses due to Intervening Terrain » Wind Direction and Speed » Atmospheric Temperature Gradients » Cloud Cover All of these influences on sound propagation are considered in every model we run using algorithms from accepted international standards and research, such as: » ISO 9613 Sound Propagation Outdoors » Verein Deutscher Ingenieure (VDI) 2714 Schallausbreitung im Freien » CONCAWE Report No. 4/81 Propagation of Noise from Petroleum and     Petrochemical Complexes to Neighboring Communities                                     ABOUT US :: SERVICES :: PROJECTS :: CLIENTS :: PUBLICATIONS :: STAFF :: CONTACT

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