Technical Reports

Truck Design Optimization Project (TDOP) Phase II: Phase I Data Evaluation and Analysis Report

  • 01
  • Aug
  • 1979
AUTHOR: David W. Gibson, Robert J. Glaser
OFFICE: RPD
REPORT NUMBER: FRA/ORD-78/52
SUBJECT: Evaluation
KEYWORDS: TDOP, Freight Car Trucks (Type I), Railroad Technology
ABSTRACT: As part of the TDOP Phase II project, the FRA directed Wyle Laboratories to evaluate and analyze the test data acquired during TDOP Phase I for use in Phase II model validation and specification of performance indices. These data were contained on 204 magnetic tapes and computer printouts. The applicability of the Phase I test data to Phase II was evaluated from three points of view. The first was completeness of the test matrix. Most Phase I tests were conducted using the 70 ton refrigerator car on an ASF ride control truck with new wheel profiles. Although this over-emphasis on one configuration will necessitate additional testing of the Type I truck, it was possible to derive useful information from the Phase I test data. The second was measurement accuracy. The quality of measurements was acceptable except for measurements of lateral wheel force at the wheel/rail interface and in the detection of ALD targets. The third point of view was the Phase I data's adequacy to perform the Type I truck model validation and specification of performance indices. The data in the regimes of ride quality and lateral stability appear to be adequate. In the regimes of curve negotiation and trackability, the lack of adequate measurements of wheel/rail forces makes it difficult to extract meaningful information from the data.
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