Track profile approximation using railcar body acceleration data.

Details

• Creators:
  Al-Nazer, Leith
• Corporate Creators:
  United States. Federal Railroad Administration. Office of Research and Development
• Subject/TRT Terms:
  • Railroads
  • Railroad tracks
  • Acceleration (Mechanics)
  • Accelerometers
  • Railroad cars
  • Vibration
  • Ride quality
  • Suspension systems
• Publication/ Report Number:
  DOT/FRA/ORD-14/42
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  United States. Federal Railroad Administration. Office of Research and Development
• Abstract:
  Accelerations are frequently measured from the car body of a rail vehicle, which is mounted above one or more suspension ; systems. Measuring accelerations in the car body is largely done for convenience, as mounting an accelerometer to a truck or axle ; of a railcar is more cumbersome than simply placing an accelerometer inside the railcar body. For those involved with track ; research, maintenance, and safety, there is a desire to correlate these car body accelerations with track conditions. However, a ; railcar suspension system acts as a filter that can interfere with taking precise acceleration measurements. To complicate matters ; further, the railcar body, in combination with the suspension system, has several natural modes of vibrations. As a result, some ; accelerations that exceed a predefined threshold measured from the railcar body do not correlate with track conditions. Thus, the ; use of acceleration data in this manner to accurately and reliably identify track defects or exceptions may be hampered-- ; potentially triggering further inspection by railroad personnel when unnecessary--or masking such indicators. This report puts ; forth a simplified model of a railcar and a corresponding deconvolution filter (also known as an inverse filter) which theoretically ; eliminates the amplification and attenuation effects of the railcar suspension system
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28986/dot_28986_DS1.pdf
• File Type:
  [PDF - 1.08 MB]
• Collection(s):
  US Transportation Collection ; Federal Railroad Administration
• Main Document Checksum:
  urn:sha256:88c248c27de8774de57a46d7064e5e86e853d8103db4c4b7132d9d963819fcbb