Development of Additional Federal Outdoor Impact Laboratory (FOIL) Facilities. Volume II: Validation of the FOIL Pendulum Upgrade
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Development of Additional Federal Outdoor Impact Laboratory (FOIL) Facilities. Volume II: Validation of the FOIL Pendulum Upgrade

Filetype[PDF-882.51 KB]


English
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Details:

  • Creators:
  • Corporate Creators:
    Scientex Corporation
  • Contributors:
    Hargrave, Martin
  • Corporate Contributors:
    United States. Federal Highway Administration. Office of Safety and Traffic Operations R&D
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA-RD-90-085
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    United States
  • Corporate Publisher:
    United States. Department of Transportation. Federal Highway Administration
  • Abstract:
    This report documents the design, development and validation of an upgraded pendulum for the Federal Outdoor Impact Laboratory (FOIL). The pendulum, which is designed to simulate the low-speed impact of a small automobile into breakaway luminaire and sign supports, has been upgraded with an 1800-lb (817 kg) mass, a new crushable nose design, special features to reduce pendulum harmonic ringing after impact, a new sweeper plate design, and provision for mounting on board accelerometers. Additional facility modifications developed as a part of this upgrade include a removable rigid foundation for mounting luminaire and sign supports and a new speed trap system. Testing conducted on the new pendulum system confirmed the adequate operation of the new speed trap system and the acceptability of the removable rigid foundation. In addition, the pendulum crush characteristics were shown to be in agreement with the crush characteristics of the bogie vehicle put into service in 1985, and to closely model the crush of the automobile which was used as a basis for the pendulum development. Tests with the new sweeper plate design confirmed its proper performance, though the breakaway force level was 50% higher than the design value. Tests with actual luminaire supports demonstrated that the pendulum could indeed be used to simulate the low-speed impact of a small car into sign and luminaire supports, though there were anomalies in the data from the slip base testing. The new speed trap system and the new sweeper plate were recommended for implementation at the pendulum facility, though the attachment bolts of the sweeper plate should be replaced with lower strength bolts so that the breakaway force level is reduced. The pendulum was recommended for evaluation of anchor base, transformer base, progressive shear, coupling mounted and other breakaway luminaire and sign supports which have already been shown to perform satisfactorily with the bogie vehicle. However, further research was recommended to evaluate the anomalies in the results of the slip base testing (with automobiles and with surrogates like the pendulum and bogie) before the pendulum is used for slip base evaluations.
  • Format:
    PDF
  • Funding:
    DTFH61-87-Z-00044
  • Collection(s):
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