ANALYSIS OF OPTIMUM AND PREVIEW CONTROL OF ACTIVE VEHICLE SUSPENSIONS

THE ANALYSIS LEADING TO THE OPTIMUM TRANSFER FUNCTION FOR AN ACTIVE SUSPENSION EXCITED BY A RANDOM GUIDEWAY INPUT IS BRIEFLY REVIEWED. THE SYSTEM HAS EXCELLENT STABILITY IN THE PRESENCE OF NOMINAL DEVIATIONS OF PARAMETERS. WHEEL-GUIDEWAY CONTACT IS CONSIDERED AND A DESIGN CHART IS DEVELOPED TO CHECK WHEEL-GUIDEWAY RELATIVE DISPLACEMENT (WHEEL HOP) FOR ACTIVE SUSPENSIONS. THE EQUATIONS FOR THE RMS FORCE REQUIRED TO PREVENT WHEEL HOP ARE DERIVED AND A DESIGN CHART IS PRESENTED WHICH SHOWS THE MINIMUM RMS VEHICLE ACCELERATION WHICH CAN BE OBTAINED WHILE APPLYING THIS FORCE. THE IMPROVED VIBRATION ISOLATION CHARACTERISTICS OF ACTIVE SUSPENSIONS WHICH USE PREVIEW CONTROL ARE INVESTIGATED FOR INFINITE AND FINITE PREVIEW DISTANCES. FOR A SIMPLE MODEL, INFINITE PREVIEW CAN REDUCE THE RMS VEHICLE ACCELERATION BY A FACTOR OF 16 AND A PREVIEW TIME OF 0.5 SECOND IS SUFFICIENT TO PROVIDE ALMOST THE SAME IMPROVEMENT. ACTIVE SUSPENSION DEVELOPMENT FOR VEHICLE HEAVE, ROLL, AND PITCH CONTROL IS A GOOD IDEA, PARTICULARLY WITH PREVIEW CONTROL. /AUTHOR/

• Corporate Authors:

  Massachusetts Institute of Technology

  Department of Civil Engineering, 77 Massachusetts Avenue
  Cambridge, MA  United States  02139
• Authors:
  • BENDER, E K
  • Paul, I L
• Publication Date: 1967-9

Subject/Index Terms

• TRT Terms: Acceleration (Mechanics); Guides to information; Mathematical analysis; Pitch (Dynamics); Randomization; Rolling; Suspensions; Vibration isolation; Wheels
• Uncontrolled Terms: Heaving
• Old TRIS Terms: Guides; Heave; Vibration isolators
• Subject Areas: Data and Information Technology; Highways; Operations and Traffic Management; Vehicles and Equipment;

Filing Info

• Accession Number: 00225678
• Record Type: Publication
• Source Agency: Traffic Systems Reviews & Abstracts
• Report/Paper Numbers: Rept Dsr-76109-6
• Files: TRIS
• Created Date: Jul 21 1970 12:00AM