Controlled Rollover Impact System (CRIS)/Roll Spit

To provide a repeatable test technique for evaluating a roof-to-ground impact in a vehicle rollover event, Exponent (in conjunction with Ford Motor Co.) developed a translating and rotating vehicle drop system. This system releases a vehicle at a pre-set height and selectable roll, pitch, and yaw attitudes, and roll velocity, from a fixture traveling at speeds up to 50 mph. Synchronous release of both ends of the vehicle is provided to ensure the desired vehicle orientation upon contact with the ground. The system is well-suited to developmental testing of rollover occupant protection systems and investigation of roof strength issues. High speed cameras suspended from the test fixture provide detailed information regarding occupant-roof-ground interactions. Such views are not available in less-controlled rollover testing techniques, such as dolly rollovers.

Indoor Roll Spit Demonstration Fixture

The Exponent indoor roll spit provides a means to conduct full-scale quasi-static simulations of vehicle rollovers. Highlights of Exponent's indoor roll spit demonstration fixture include the ability to conduct ground-level surrogate inspections followed by the inversion demonstration; easy evaluation of parameters such as restraint geometry and head clearance in an inverted position; an open design promoting unobstructed photography; quick vehicle change-out times and a climate- and lighting-controlled environment.

Outdoor Roll Spit Demonstration Fixture

Exponent also operates an outdoor roll spit demonstration fixture. This device provides a means to conduct full-scale quasi-static simulations of vehicle rollovers. The fixture can accommodate most passenger vehicles. It is conveniently positioned next to our outdoor crash rail and can be used to quickly invert vehicles following a crash test to comply with such standards as FMVSS 301. The ramp-loading feature allows for quick vehicle change-out times, permitting multiple vehicle inversions to be completed in a given day.

Related Pages: Crash Testing , Test and Engineering Center

top