HYGE Side Impact System (M-SIS)

M-SIS System with dummy in place. The system provides cost effective development of side impact restraint systems without need for full scale crash tests.

The MIRA Side Impact System (M-SIS) has been developed and proven at MIRA and is supplied by HYGETM 

M-SIS provides a technique for developing and optimising vehicle side impact restraint systems, such as door/B-post trim and side impact airbags.

M-SIS simulates the inner door panel to occupant intrusion during a side impact sequence in an accurate and repeatable way.

M-SIS does this by reproducing the velocity profile of the door and side structure as it impacts and accelerates the occupant.

The characteristic peaks and troughs encountered in the velocity profile require the sled to be rapidly accelerated and decelerated. This is achieved by placing braking sleds at suitable increments along the track and by using a special metering pin

The original M-SIS equipment has been developed, used and proven at MIRA since 1995, using a standard 12” HYGETM system which has been in operation at MIRA since 1980.

This equipment represents the latest development of the system.

System Components

M-SIS Main Testing Sled

The system uses the standard 12” HYGETM gun and comprises five main components:

  • Test sled – The test sled supports the door and B-post complete with inner trim and restraint systems including the seat and seat belt mounts. The door and B-post are mounted to the test sled via a rigid structure, it is this sled and structure that is given the required velocity profile during the test.
  • Seat plinth – The seat is mounted to the sled via a sliding plinth which controls the movement of the seat during the test.
  • First brake sled – The braking sleds have the function of holding weight blocks at suitable increments along the track.
  • Second brake sled – The sleds are fitted with mechanical brakes and crush tubes, which control the force between the sleds and hence control the deceleration.
  • Metering pin – A special modular metering pin is used.
  • No additional control systems are required.

The videos below show the M-SIS in Action

System Performance

  • Test sled acceleration from actuator – maximum 100g (depending on total test mass)
  • Braking sled deceleration effect – maximum velocity drop 5 m/s (depending on mass).

Training and Installation

Training at MIRA, installation and commissioning of the equipment are available.

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