Laboratory Testing Machines for Measuring the Steady State Force and Moment Properties of Passenger Car Tires
This recommended practice describes some basic design requirements and operational procedures associated with equipment for laboratory measurement of tire force and moment properties of the full range of passenger car tires. These properties must be known to establish the tire's contribution to vehicle dynamic performance. Many factors influence laboratory tire force and moment measurements. This recommended practice was compiled as a guide for equipment design and test operation so that data from different laboratories can be directly compared and applied to vehicle design and tire selection problems. This recommended practice is based on types of equipment and procedures that are used in several laboratories for routine tire evaluation. This limits the scope of this recommended practice to equipment and methodology for measuring the steady state properties of free-rolling tires. The procedures are intended to characterize the performance of the tire under operating conditions which are essentially invariant with time or which vary slowly enough so that dynamic effects are negligible (quasi-static rolling conditions). This recommended practice includes specific recommendations for space, measuring system ranges and accuracy needed to measure the force and moment properties of the full range of passenger car tires. It must be emphasized that the experience on which this Recommended Practice is based has been primarily obtained through testing of passenger car tires.