Technical Reports

Vibration Level Data: Brighton-New York City Transit Authority

  • 01
  • Feb
  • 1981
AUTHOR: Edward J. Rickley, Norman E. Rice
SUBJECT: Passenger Rail
KEYWORDS: Ground-Born Vibration, Noise Control, Rapid Transit Systems, Structural Vibration, Vibration Level Measurements
ABSTRACT: This report documents the results of a vibration measurement program conducted on 14-15 August 1980 in the Midwood Section of Brooklyn, New York, next to the tracks of the Brighton Line of the New York City Transit Authority. The test was conducted by the Transportation Systems Center (TSC) for the Urban Mass Transportation Administration. The purpose of this test was to expand the data base being developed by the TSC for the prediction of ground-borne noise and vibration from nearby transit systems. A two-story home- of a private citizen at 1546 East 16th Street in Brooklyn, was instrumented with six vibration transducers in several of the rooms and on the outside patio,in order to obtain a measure of the ground and structural vibration levels resulting from the passby of rapid transit trains on the nearby tracks. This house was built on the old roadbed of the Long Island Railroad in 1943 and stands approximately 30 feet from the near track of the four-track right-of-way-of the Brighton Line. An analysis of the data showed the ground-borne vibration spectra peaked in the 40 Hz 1/3 octave band. This frequency is directly related to the natural resonance of the track cars' suspension system. The spectral data measured in the home (vertical axis midfloor) exhibited an additional peak near 20 Hz. This is a function of the natural resonance of the floor. No attempt has been made to assess the vibration level measured versus annoyance or damage criteria since it is beyond the scope of this limited project.