Lewis S. Goodfriend & Associates is a diversified acoustical engineering and consulting firm offering professional services for the acoustical design of interior spaces, evaluation and control of interior and exterior noise from mechanical equipment, noise impact assessments for major commercial, industrial, and power generation facilities, OSHA noise exposure studies, and sound and impact isolation design and testing.
We also have experience in providing expert witness testimony at legal proceedings and before municipal boards. LSG&A has more than 65 years of experience in the field of acoustics. We have licensed Professional Engineers and an INCE Board Certified member on staff, and staff members have been approved as noise experts under the NYCDEP noise code.
We also have experience in providing expert witness testimony at legal proceedings and before municipal boards. LSG&A has more than 65 years of experience in the field of acoustics. We have licensed Professional Engineers and an INCE Board Certified member on staff, and staff members have been approved as noise experts under the NYCDEP noise code.
Services
LSG&A provides services to measure, evaluate, and control noise and vibration within spaces and in the environment.
Governing bodies such as the NJDEP and NYCDEP maintain and enforce noise regulations within their jurisdiction, and many industry standards set background sound level goals for interior spaces.
Outdoor noise evaluations involve traditional techniques for spreadsheet based modeling in addition to three-dimensional software to calculate expected sound levels for complex outdoor situations, considering the effects of distance, topography, ground cover, structures, and source directivity.
Governing bodies such as the NJDEP and NYCDEP maintain and enforce noise regulations within their jurisdiction, and many industry standards set background sound level goals for interior spaces.
Outdoor noise evaluations involve traditional techniques for spreadsheet based modeling in addition to three-dimensional software to calculate expected sound levels for complex outdoor situations, considering the effects of distance, topography, ground cover, structures, and source directivity.
These classifications are used to describe sound and impact isolation of individual elements and composite assemblies.
We'll explain the differences and help you determine which parameters are best suited for your application.
LSG&A provides sound isolation and impact isolation testing using portable sound level analyzers, loudspeakers, and tapping machines.
Field testing is performed using the latest versions of ASTM E336, E1007, E2964 to verify Building Code, LEED, ANSI, FGI, and project-specific design goals for sound and impact isolation between spaces.
We'll explain the differences and help you determine which parameters are best suited for your application.
LSG&A provides sound isolation and impact isolation testing using portable sound level analyzers, loudspeakers, and tapping machines.
Field testing is performed using the latest versions of ASTM E336, E1007, E2964 to verify Building Code, LEED, ANSI, FGI, and project-specific design goals for sound and impact isolation between spaces.
Reverberation Time (RT60) is a common acoustical design goal metric for interior spaces, and is used in many industry standards and guidelines including ANSI, LEED, and FGI.
Related parameters include the Noise Reduction Coefficient (NRC) and Sound Absorption Average (SAA) which describe the sound absorption properties of building materials such as acoustical ceiling tiles and fabric wall panels.
Sound absorption coefficients and Sabin data from laboratory tests of materials and products are used as inputs for reverberation time calculations.
Related parameters include the Noise Reduction Coefficient (NRC) and Sound Absorption Average (SAA) which describe the sound absorption properties of building materials such as acoustical ceiling tiles and fabric wall panels.
Sound absorption coefficients and Sabin data from laboratory tests of materials and products are used as inputs for reverberation time calculations.
LSG&A provides services for municipal applications and litigation involving evaluation of noise impacts and acceptability.
The firm's expertise centers around the evaluation of compliance with federal, state and local noise regulations, comparing the measured and predicted sound levels with the ambient sound, and evaluating acoustical impact on nearby residential and commercial activities.
Recent applications requiring expert testimony for acoustics include warehouses, restaurants, car washes, emergency generators, hospitals, quarries, asphalt plants, and telecommunication facilities.
The firm's expertise centers around the evaluation of compliance with federal, state and local noise regulations, comparing the measured and predicted sound levels with the ambient sound, and evaluating acoustical impact on nearby residential and commercial activities.
Recent applications requiring expert testimony for acoustics include warehouses, restaurants, car washes, emergency generators, hospitals, quarries, asphalt plants, and telecommunication facilities.
Commercial applications typically involve managing noise impacts in the surrounding community.
Baseline measurements are performed to quantify the existing conditions, and the impact due to proposed activities are evaluated and compared to the applicable noise regulations.
Where needed, noise control recommendations are developed to reduce the acoustical impact on the community.
In addition, LSG&A provides expert witness testimony for applications before municipal boards and post-installation testing to verify compliance.
Baseline measurements are performed to quantify the existing conditions, and the impact due to proposed activities are evaluated and compared to the applicable noise regulations.
Where needed, noise control recommendations are developed to reduce the acoustical impact on the community.
In addition, LSG&A provides expert witness testimony for applications before municipal boards and post-installation testing to verify compliance.
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