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Crash!
It almost seems counterintuitive: a crash test that is about deceleration, not acceleration.
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It almost seems counterintuitive: a crash test that is about deceleration, not acceleration. But that’s part of the procedure used at the Transport Canada Motor Vehicle Test Center in Blainville, which is said to be one of the most advanced crash-test facilities in the world.
They’re using a something called a Hydrobrake. The vehicle is on a sled, which is accelerated toward the Hydrobrake that is at the barrier. There is a wedge on the front of the sled, and it enters the Hydrobrake through two brake shoes, displacing an upper brake piston into a hydraulic cylinder, thereby providing controlled deceleration through the regulation of the oil flow by a computer-aided controller. The pressure is a measure of the braking force that determines the deceleration.
According to Messring Systembau GmbH which provides the Hydrobrake system, a benefit of the deceleration crash is that the direction of the movement is synchronous with the crash, not inverse, as is the case with acceleration tests.
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