Accession Number:

ADA046565

Title:

A Comparative Study of the Ride Quality of TRACV Suspension Alternatives.

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1977-09-01

Pagination or Media Count:

125.0

Abstract:

A linear, unconstrained perturbation model for the Tracked Ram Air Cushion Vehicle is developed. This model is the result of theoretical expressions for the TRACV which have been verified by wind tunnel and towed model tests. This model is varied to allow for passively suspended, two-degree-of-freedom winglets and for processor-controlled actuators on the same winglets. Optimization of the springs and dampers in the passive suspension is performed according to a performance index based on acceleration, winglet gap variation, and control power. Linear optimal control is applied to the active suspension to determine the optimal feedback gains using a similar performance index. The basic, passively suspended, and actively suspended vehicles are analyzed to determine root mean squared values for following 1 vertical acceleration in the foremost and rearmost seats in the passenger cabin, 2 gap variation at the front and rear winglet areas, and 3 control deflection. The acceleration spectral density of each of the vehicle types is compared to the Urban Tracked Ram Cushion Vehicle standard. The active control system is analyzed to see if a reduced set of sensors may achieve acceptable ride quality based on the above measures. Author

Subject Categories:

  • Surface Effect Vehicles and Amphibious Vehicles
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE