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Noise and Vibration Services

Trinity provides a wide range of noise and vibration services including the following:

  • Industrial noise impact assessments
  • Ambient sound and vibration measurement and characterization
  • Federal, state, and local noise standard compliance planning and verification
  • Background noise studies
  • Noise and vibration propagation modelling
  • Siting studies for new plants and expansions
  • NEPA Environmental Assessments (EA) noise reports
  • FERC Resource Report 9 noise section preparation
  • Noise impact mitigation assistance
  • Building and architectural acoustics
  • Occupational noise monitoring, mapping, and mitigation design

What is Noise and Vibration?

Noise and vibration are inherent to industrial, commercial, entertainment, and transport activities. Sources of noise can include:

  • Fans and exhausts and other industrial control systems
  • Vehicle operations including loading and unloading
  • Baghouses and pollution control equipment
  • Rotating crushers and other machinery
  • Material handling processes
  • Generators, motors, engines and turbines;
  • Steam and gas venting and pressure drops in piping systems
  • Transport including road, rail, air and shipping
  • Entertainment noise including music and crowd noise
  • Commercial operations including mechanical plant, car parking, and loading docks

Who needs Noise and Vibration Services?

Environmental nuisance noise and vibration are becoming increasingly regulated by federal, state, and local agencies. For example, certain natural gas projects under the jurisdiction of the Federal Energy Regulatory Commission (FERC) are required to conduct detailed ambient noise measurements and noise impact analyses at sensitive areas to demonstrate compliance with federal noise standards. Increasingly more municipalities are adopting noise ordinances that set technical noise standards at plant fence lines and residential receptors. Failure to comply with these standards can lead to community relations issues and potential lawsuits. ​

Trinity Can Help - Contact Us Today

Trinity personnel have performed noise and vibration monitoring and impact assessment projects in numerous US states, Canadian provinces and Australian states. Projects have ranged from the predictive modeling of impacts at noise sensitive areas to assistance with selection of mitigation methods. Assessment includes measurement of acoustic emission data for noise sources and characterization of ambient noise and vibration levels. Facilities and emission sources for which we have performed noise and vibration assessments include the following:

  • Stationary reciprocating and combustion-turbine powered electrical generating systems
  • Many types of manufacturing facilities
  • Natural gas compressor stations and storage facilities
  • Reciprocating engines, turbines, cooling systems, dehydrators, pressure reduction valves and vents, substations, etc., at natural gas compressor stations
  • Construction projects involving heavy equipment
  • Horizontal directional drilling and salt cavern development activities
  • Mining and extractive industries
  • Sporting and music venues
  • Educational and health facilities
  • Transportation projects including road, rail, air and shipping

Trinity has prepared and conducted the modeling and monitoring work and prepared the sections of Resource Report 9 necessary to characterize ambient sound quality and predict noise impact for natural gas projects in many states. Our experience includes responding to FERC data requests and conducting post-operational compliance demonstration monitoring.

Trinity Consultants assists clients with noise and vibration in a variety of ways:

Predicting Noise Impacts

Trinity can predict the impact of noise sources at fence lines and noise sensitive areas using both vector modeling software packages (e.g., CadnaA and SoundPLAN) and our workbook-based calculation tools. Vector modeling software enables accounting for complex scenarios, such as industrial facilities having multiple sources spread over large areas, widely varying topography, structure reflections, ground cover, barriers, atmospheric effects, etc. It also provides a means of determining which noise sources have the largest impact on any given receptor and allows the testing of proposed noise mitigation measures. Trinity's workbook-based calculation tools along with a database of acoustical data for many types of noise sources, typically offer a conservative prediction at modest expense for uncomplicated scenarios.

Trinity's modeling tools allow us to:

  • Incorporate complex building and terrain geometry
  • Generate noise contour plots
  • Efficiently quantify multiple noise sensitive areas
  • Generate 2D and 3D visualization
  • Avoid costly field studies by using source data and predictive analysis

Measurement and Characterization

When appropriate, Trinity uses research-grade sound level meters (SLMs) in the field to measure ambient sound levels and characterize sound sources at noise sensitive areas and fence lines. This is a requirement for certain federal rules and is often necessary and prudent before undertaking construction of new noise sources in municipalities with noise standards and when investigating noise related complaints. Trinity can also measure the magnitude and frequency of ground vibrations as needed to demonstrate compliance with vibration standards, or to identify issues to be treated.

Understanding and Selecting Noise Mitigation

Trinity can assist its clients in understanding and selecting noise mitigation measures, including exhaust and vent silencers, acoustic insulation for buildings, ventilation systems and piping, noise berms and barriers, work practices, proper equipment specifications, etc. Trinity has a library of noise mitigation equipment and vendor data for use in selecting appropriate mitigation measures.

Architectural Acoustics

Trinity can determine design criteria for and develop detailed design of noise sensitive spaces to achieve acceptable internal acoustics such as room finishes, building envelope and façade treatment, internal partitioning, and control of mechanical plant noise.

For assistance with Noise and Vibration Services, contact:

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