Accession Number : AD0635973

Title :   AN ANALOG COMPUTER SIMULATION STUDY OF THE LATERAL DYNAMICS OF AN AUTOMATICALLY-GUIDED AUTOMOBILE.

Corporate Author : CORNELL AERONAUTICAL LAB INC BUFFALO N Y TRANSPORTATION RESEARCH CENTER

Personal Author(s) : Asseo, Sabi J.

Report Date : JAN 1966

Pagination or Media Count : 40

Abstract : The computer study is based on design data pertaining to the 1953 Buick. The characteristics of current automobiles are not appreciably different from the model used in the computer mechanization. Therefore, by building sufficient flexibility in the gain adjustments of the system, the same controller can be made to operate with any full size American car. The static margin of the automobile is an important factor in the selection of gain constants. It is preferred to use an automobile with zero or positive static margin. If an automobile is understee (positive static margin), varying the tire pressure and changing the CG location by adding weight to the car, can change the static margin to improve the handling characteristics. To provide controllability over a wide range of lateral displacements from the desired path, the pickup coils should be located as far apart about the centerline of the car as practical. The coil inclination angle can be determined experimentally to provide a maximum range of controllability, for a given coil clearance. The servo actuator used need not have a fast response, especially at low forward velocities. However, the use of high pressure valves with low load reflection is advantageous, in allowing higher servo feedback gains at high forward velocities, without causing minor loop oscillations. (Author)

Descriptors :   (*DYNAMICS, *PASSENGER VEHICLES), (*SIMULATION, *ANALOG COMPUTERS), AUTOMATIC, GUIDANCE

Subject Categories : Operations Research
      Surface Transportation and Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE