TRACKED AIR-CUSHION VEHICLE TO SUSPEND, BRAKE DYNAMICALLY

A NEW TYPE OF HIGH-SPEED TRACKED AIR-CUSHION VEHICLE (TACV) WILL BE BUILT BY GRUMMAN AEROSPACE CORPORATION, BETHPAGE, NEW YORK. THE VEHICLE WILL BE CAPABLE OF RIDING AT SPEEDS OF 300 MPH, EVEN AROUND TURNS, WITHOUT MAKING PASSENGERS UNCOMFORTABLE. THE VEHICLE WILL BE GUIDED BY AIR CUSHIONS BLOWING AGAINST THE SIDES OF ITS RIGHT-OF-WAY CHANNEL, OR GUIDEWAY. THE PROPULSION SYSTEM HAS NOT BEEN DETERMINED FOR SUCH TACV VEHICLES. THE CHOICE WILL PROBABLY LIE BETWEEN AERO PROPULSION AND A LINEAR INDUCTION MOTOR. GRUMMAN WILL TRY THE LINEAR INDUCTION MOTOR TECHNIQUE FIRST, BECAUSE IT OFFERS THE ADVANTAGES OF A LOW NOISE LEVEL AND MINIMUM AIR POLLUTION. THE AIR-CUSHION PROVIDES A MEANS OF ELIMINATING MECHANICAL CONTACT BETWEEN THE VEHICLE AND GUIDEWAY, THEREBY SERVING AS AN ESSENTIALLY FRICTIONLESS BEARING AND AS A NATURAL SUSPENSION. THE AIR-CUSHION DISTRIBUTES THE LOAD AND FILTERS THE TRACK ROUGHNESS. THE NEW TACV WILL EMPLOY A COORDINATED MULTI-BRAKE SYSTEM. DURING NORMAL BRAKING, THE AERODYNAMIC AND FLAP-BRAKES ARE USED, THE TURBOFANS REVERSE, AND THE LINEAR MOTOR GOES INTO A REGENERATIVE-BRAKING PHASE, ALL IN AN AUTOMATIC SEQUENCE. AS THE VEHICLE SLOWS DOWN THE FRICTION PADS ARE ACTIVATED AGAINST THE SIDE WALLS TO BRING THE CAR TO A STOP. IN AN EMERGENCY, THE VEHICLE WILL PARACHUTE-BRAKE AND SHUT THE AIR TO THE AIR-CUSHION PADS TO LET THEM DROP ONTO THE HORIZONTAL RAILS FOR ADDITIONAL FRICTION BRAKING. THE BODY OF THE VEHICLE IS ATTACHED AS A UNIT TO THE LOWER CHASSIS BY MEANS OF FOUR AIR SPRINGS. A SERIES OF ACCELERATION SENSORS WILL VARY THE AIR PRESSURE TO THE SPRINGS TO TILT THE BODY ALONG ITS AXIS SMOOTHLY AND CONTINUALLY TO MEET DESIGN REQUIREMENTS THAT PASSENGERS MUST FEEL A FORCE OF GRAVITY ACTING STRAIGHT DOWN, WITH NO SIDE THRUSTS.

  • Supplemental Notes:
    • Vol 41, No 8, P 85, 1 FIG, 1 PHOT
  • Publication Date: 1970-4-13

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  • Accession Number: 00241344
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 3 1970 12:00AM