FRICTION BRAKING SYSTEMS REPORT NO 6

DEVELOPMENT AND TESTING OF SEVEN RAPID TRANSIT FRICTION BRAKE SYSTEMS --- PNEUMATIC TREAD, ELECTRICAL TREAD, ELECTROPNEUMATIC TREAD, PNEUMATIC DISC, HYDRAULIC DISC, ELECTRIC DISC, AND HYDRAULIC TREAD --- ARE DESCRIBED AND EVALUATED WITH RESPECT TO THEIR CONTROL, ACCURACY, LINEARITY, EFFECIENCY, EXPECTED LIFE, AND GENERAL PERFORMANCE CHARACTERISTICS. TESTS DESIGNED TO INVESTIGATE BLENDING, FREQUENCY RESPONSE, TORQUE FEED-BACK, SLIP-SPIN, AND THE STEADY AND TRANSIENT STATE CHARACTERISTICS OF BOTH DYNAMIC AND FRICTION BRAKE SYSTEMS IN AN INTEGRATED VEHICLE SYSTEM REVEALED THE ABILITY TO RESPOND ACCURATELY TO AN INPUT SIGNAL WITH A MINIMUM LOSS OF TIME. THE TESTS ALSO SHOWED THAT THE ADDITION OF A MINIMUM AMOUNT OF FRICTION BRAKING EFFORT DURING THE DYNAMIC BRAKING CYCLE HELPED SMOOTH THE TRANSITION BY ELIMINATING MANY OF THE TRANSIENT EFFECTS. IN ADDITION, TEST RESULTS VERIFIED THE ADVANTAGE OF AN ANALOG-TYPE CIRCUIT IN ORDER TO OBTAIN PROPORTIONAL BRAKING CONTROL UNDER CONDITIONS OF LIMITED ADHESION. TEST OPERATIONS UNDER CONTROLLED CONDITIONS AND CRITICAL PERFORMANCE EVALUATION INDICATE THE NEED FOR CLOSE CONTROL OF AN INTEGRATED BRAKING SYSTEM IN ORDER TO MAINTAIN REQUIRED VEHICLE PERFORMANCE. /UMTA/

  • Supplemental Notes:
    • PROJ NO CAL-MTD-2
  • Corporate Authors:

    Parsons, Brinckerhoff-Tudor-Bechtel

    814 Mission Street
    San Francisco, CA  United States  94103
  • Publication Date: 1968-6

Subject/Index Terms

Filing Info

  • Accession Number: 00242171
  • Record Type: Publication
  • Source Agency: Urban Mass Transportation Administration
  • Files: TRIS, USDOT
  • Created Date: Feb 23 1981 12:00AM