Ldn definition

Ldn means licensed dietitian/nutritionist.

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Ldn. (day-night average level) means the average equivalent A-weighted sound level during a twenty four (24) hour day, obtained after the addition of ten (10) decibels to sound levels in the night after 10 p.m. and before 7 a.m. Reserved for future use.

Ldn means a day-night average sound level and serves as a basic measure for quantifying noise exposure, namely, the A-weighted sound level averaged over a twenty-four hour time period, with a ten decibel penalty applied to nighttime (ten p.m. to seven a.m.) sound levels.

Examples of Ldn in a sentence

• CPMC shall obtain the services of a qualified acoustical consultant to perform a detailed interior-noise analysis and develop noise-insulating features for the habitable interior spaces of the proposed Cathedral Hill Hospital that would reduce the interior traffic-noise level inside the hospital to 45-dB Ldn.

• Interior spaces of the hospital shall be designed to include insulating features (e.g., laminated glass, acoustical insulation, and/or acoustical sealant) that would reduce interior noise levels to 45 dB Ldn or lower.

• Project Sponsor/Acoustical Consultant to perform detailed interior-noise analysis of Project Sponsor/Acoustical Consultant and OSHPD (interior noise standards within the hospital Considered complete upon ERO’s confirmation of an OSHPD approved permit include insulating features (e.g., laminated glass, acoustical insulation, and/or acoustical sealant) that would reduce interior noise levels to 45 dB Ldn or lower.

• CPMC shall obtain the services of a qualified acoustical consultant to perform a detailed interior-noise analysis and develop noise-insulating features for the habitable interior spaces of the proposed St. Luke's Replacement Hospital that would reduce the interior traffic-noise level inside the hospital to 45-dB Ldn.

• In areas where the noise level is anticipated to be 55 Ldn and above, prior to issuance of a building permit of construction of noise sensitive land use (real property normally used for sleeping or normally used as schools, churches, hospital, or public libraries) the permit applicant shall be required to demonstrate that a noise abatement strategy will be incorporated into the building design which will achieve an indoor noise level equal to or less than 55 Ldn.

More Definitions of Ldn

Ldn means the 5 day “Day Night Average Sound Level” as defined in NZS6801:1999 and is the night-weighted sound exposure level in A-frequency weighted decibels. (An additional 10 dBA is added to the Leq for the period from 10 pm to 7 am.) It is measured for 24 hours from midday to midday.

Ldn means the equivalent sound level for a 24-hour period with an additional 10 dB imposed on the equivalent sound levels for night time hours between 10:00 P.M. and 7:00 A.M.

Ldn means Lyden, Dolan, Nick & Co., LLC, a New York limited liability company.

Ldn means the equivalent sound level for a 24-hour period with an additional 10 dB imposed on the equivalent sound levels for night time hours between 10 PM and 7 AM.

Ldn means the equivalent sound level for a 24-hour period with an additional 10 dB

Ldn means the directly measurable sound level quantity using the day-night average sound level methodology developed for the United States environmental protection agency for estimating noise impacts at both civil and military airports.

Ldn means average noise exposure over a 24-hour period, rather than a single noise-generating event such as the sounding of a horn. When calculating Ldn, night-time noise is typically weighed more heavily.