Train-to-Train Impact Test of Crash Energy Management Passenger Rail Equipment: Occupant Experiments

Five interior occupant experiments were conducted as part of the train-to-train impact test of CEM equipment. Each of these experiments was similar to those conducted in the previous two-car CEM impact test. The objective of these tests was to evaluate the performance of improved seats and tables, as well as to measure the occupant response under collision conditions of CEM equipment. As described previously in this paper, the decelerations experienced by the cars during the CEM train-to-train test were quite severe. In spite of the severe collision environment, several improvements to occupant safety were quantified. The HICs measured in the intercity seat experiment were reduced significantly from the two-car CEM test; however, they are still not below the maximum allowable threshold. Stiffer and/or thicker padding on the seat back has been identified as a means to further improve the head and neck injury measurements. The prototype commuter seat experiments suffered failure at the seat pedestal attachment to the floor. The seat attachment failure in the rear-facing seat experiment was so severe that occupant compartmentalization was lost. The seat attachment failure in the forward-facing experiment was less severe and allowed the compartmentalization of the occupants, while also limiting all injury criteria measured to roughly half of the maximum allowable levels. The seat attachment method is being analyzed, and an improved attachment method will be tested under quasi-static and dynamic sled test conditions to demonstrate that the design requirements are met. The workstation table experiments demonstrated that the design requirements were met and that the table performed as expected. The table remained fastened to the wall, and the injury criteria were all within the specified maximum thresholds. The overall test demonstrated that the CEM design successfully preserved all the occupant volume for the locomotive engineer, as well as the passengers. The occupant experiment results indicate that, even though the secondary impact environment in the CEM train-to-train test was more severe than that of the conventional train-to-train test, steps can be taken to mitigate the higher SIVs.


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Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: 12p
  • Monograph Title: 2006 American Society of Mechanical Engineers (ASME) International Mechanical Engineering Congress and Exposition

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Filing Info

  • Accession Number: 01053864
  • Record Type: Publication
  • Report/Paper Numbers: IMECE2006-14420
  • Files: TRIS
  • Created Date: Jul 5 2007 3:13PM