THE EXPERIMENTAL SAFETY VEHICLE PROGRAM HAS INCORPORATED PERFORMANCE REQUIREMENTS ON ACCIDENT AVOIDANCE CAPABILITY IN ITS VEHICLE SPECIFICATIONS FROM ITS INCEPTION. THESE REQUIREMENTS HAVE BEEN RELATED TO THE VEHICLE'S RESPONSE IN A NUMBER OF STANDARDIZED TEST PROCEDURES AS REFLECTED BY CERTAIN MEASURABLE PERFORMANCE CHARACTERISTICS. THE SELECTED METRICS ARE USEFUL FOR HANDLING EVALUATIONS BUT THEY ARE RESTRICTED TO THE PRESCRIBED OPERATING CONDITIONS AND DO NOT TREAT CAR BEHAVIOUR AT THE LIMIT - THE TRUE ACCIDENT AVOIDANCE SITUATION. A TECHNIQUE - THE MOMENT METHOD - WHICH REMOVES SOME OF THE LIMITATIONS IS DESCRIBED. IT IS BASED ON EXAMINATION OF THE FORCES AND MOMENTS DEVELOPED BY THE TIRES AS AFFECTED BY SUSPENSION AND STEERING CHARACTERISTICS. A SIMULATION PROGRAM WHICH PROVIDES FOR THE GENERATION OF PERFORMANCE PORTRAITS OVER WIDE RANGES OF OPERATING CONDITIONS IS DISCUSSED. THESE PORTRAITS CAN BE USED TO ILLUSTRATE THE INFLUENCE OF DESIGN MODIFICATIONS AND OPERATING CONDITIONS ON THE VEHICLE'S RESPONSE. NONLINEAR DESIGN CHARACTERISTICS, CHANGES IN LATERAL AND LONGITUDINAL TRIM, AVAILABLE MANOEUVERING MOMENT, AND LIMIT CONDITION PERFORMANCE ARE AMONG THE FACTORS WHICH ARE DISCUSSED. THE METHOD IS EXPLAINED THROUGH USE OF SAMPLE DIAGRAMS TO ILLUSTRATE HOW THE PORTRAITS ARE GENERATED AND HOW THE FIGURES CAN BE INTERPRETED TO IDENTIFY POTENTIAL HANDLING PROBLEMS. (A) FOR THE COVERING ABSTRACT OF SECTION 5 SEE IRRD 266063. FOR THE COVERING ABSTRACT OF THE CONFERENCE SEE IRRD 266046.
Abstract