Real Time Foam Performance Testing

Abstract

Real time automotive seat performance evaluations are now made possible by a new and unique computerized laboratory test. Most historic foam performance testing relies upon a post dynamic mode measurement of foam parameters after a relaxation period. The well-known ability of HR polyurethane foam to quickly recover lost properties suggests real time testing to be a better measure of the in-use performance of an automotive seating foam. The new test utilizes a hydraulically operated indentor foot to provide seat cushion loading under dynamic conditions, comparable to those of actual driver and passenger use. In a relatively short period of time, such as 8 to 9 hours, it is possible to record several real time changes in the performance of seats which are critical to their «in-use» comfort and safety qualities