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Journal Article

Brake Burnishing Effect on AEB Performance

2015-04-14
2015-01-1481
The Insurance Institute for Highway Safety (IIHS) evaluates autonomous emergency braking (AEB) systems as part of its front crash prevention (FCP) ratings. To prepare the test vehicles' brakes, each vehicle must have 200 miles on the odometer and be subjected to the abbreviated brake burnish procedure of Federal Motor Vehicle Safety Standard (FMVSS) 126. Other organizations conducting AEB testing follow the more extensive burnishing procedure described in FMVSS 135; Light Vehicle Brake Systems. This study compares the effects on AEB performance of the two burnishing procedures using seven 2014 model year vehicles. Six of the vehicles achieved maximum AEB speed reductions after 60 or fewer FMVSS 135 stops. After braking performance stabilized, the Mercedes ML350, BMW 328i, and Volvo S80 showed increased speed reductions compared with stops using brand new brake components.
Technical Paper

Corner Protection in Low-Speed Crashes

2007-04-16
2007-01-1760
Recent estimates of the annual cost to repair vehicle damage from motor vehicle crashes ranges from $17 billion (£9.1 billion) paid by U.K insurers to $45 billion paid by U.S. insurers. Many of these repairs were for damage sustained in low-speed front and rear impacts, with the majority costing less than $2, 500 to repair in both countries. In about a quarter of all claims the damage is limited to the vehicle corners and vehicle bumpers should prevent or limit much of the damage sustained in these minor crashes. However, many vehicles do not have bumper reinforcement beams that extend laterally much beyond the frame rails, leaving expensive vehicle components such as headlamps and fenders (wings) unprotected. Research by IIHS and Thatcham shows that 15 percent overlap front and rear crash tests at 5 km/h into a bumper-shaped barrier produce vehicle damage similar to that seen in real-world crashes and in vehicle-to-vehicle front-to-rear crash tests with low overlap.
Technical Paper

Changes in Vehicle Designs from Frontal Offset and Side Impact Crash Testing

2003-03-03
2003-01-0902
The Insurance Institute for Highway Safety (IIHS) has been conducting frontal offset crash tests of new passenger vehicles and providing comparative crashworthiness information to the public since 1995. This program has resulted in large improvements in frontal crashworthiness largely because vehicle structures have been redesigned to prevent significant collapse of the occupant compartment. In late 2002, IIHS began a side impact crash test program in which the side-impacting barrier has been designed to simulate the geometry of the front ends of SUVs and pickups, which pose a much larger threat in side impacts than the lower front ends of cars. It is anticipated that this program, too, will result in changes in vehicle structure, in this case the structure of the vehicle side pillars and door hardware. Good performance in the side impact test also is likely to require installation of side airbags (or comparable system) to protect the head and/or chest.
Technical Paper

Effect of Hybrid III Leg Geometry on Upper Tibia Bending Moments

2001-03-05
2001-01-0169
The knee and ankle joint pivots of the Hybrid III dummy's leg are positioned in approximately the same orientation as the knee and ankle joint rotation centers of a human in a normal driving posture. However, the dummy's leg assembly is not simply a straight member between these two pivots. It is a zigzag-shaped solid link composed of one long straight section in the middle and short angled sections at either end, which form the pivots. The upper and lower tibia load cells are mounted on the straight middle section, making the upper tibia load cell location anterior to the line between the ankle and knee pivots and the lower tibia load cell location slightly posterior to the line between the pivots. Hence, an approximately vertical force on the foot can act along the line behind the upper tibia load cell and in front of the lower tibia load cell, creating bending moments.
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