Preliminary Vibration Measurements on Mark I Vehicle

Details

• Creators:
  Weinstock, Herbert ; Nickles, John E.
• Corporate Creators:
  John A. Volpe National Transportation Systems Center (U.S.)
• Corporate Contributors:
  United States. Department of Transportation. Urban Mass Transportation Administration
• Subject/TRT Terms:
  • Acoustic measuring instruments
  • Acoustics
  • Field tests
  • Vibration
  • Inspection
  • Nondestructive tests
  • Acoustic measurement
• Publication/ Report Number:
  DOT-TSC-UMTA-72-02
• DOI:
  https://doi.org/10.21949/1526659
• Resource Type:
  Tech Report
• Geographical Coverage:
  New York (New York)
• Corporate Publisher:
  United States. Department of Transportation. Urban Mass Transportation Administration
• Abstract:
  Preliminary measurements have been made on the acceleration and vibration environment of the Mark I vehicle while operating on the New York City Transit System. Measurements at the journal box indicated short period high acceleration pulses as large as 120g with durations of about one milli-second occurring at infrequent intervals. The rms accelerations, however, were of the order of 2g and correlated closely with speed. A close correlation of vibration level and sound level was also observed. Changes in track roughness were observable from the accelerometer traces. The ride vibration translational accelerometers indicated vertical accelerations of the order of 0.1 to 0.3 rms and lateral accelerations of 0.05 to 0.08g rms. the in-car vibration appears to be dominated by vehicle pitch and lateral body and roll body modes of vibration. The frequencies of vibration below 10 Hz appear to be independent of speed indicating that the response of the vehicle is governed by the natural modes of vibration excited by either a succession of transients or by random roadbed irregularities which do not have a regular speed. The levels of vibration and frequency distribution fall within ride comfort standards proposed by the International Standards Organization.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/10176/dot_10176_DS1.pdf
• File Type:
  [PDF - 6.53 MB]
• Collection(s):
  Volpe Center
• Main Document Checksum:
  urn:sha256:1712f6327794ea0757e48a488ad952216e5a30b72473dc3f1b8df4fd637d0b61