By Kathy Willis,2014-05-27 15:36
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     RIS - Compact Impact Simulator Code 1AG-A

     Since 1968

     Figure 1: Compact Impact Simulator

     Servo-hydraulic accelerator system for tests up to 50 km/h, 250 kg payload and 20 G Precise control of acceleration, speed and displacement One-man operation, computer-controlled, full-automatic test run Extremely compact

     Classic accelerator sled systems for automotive applications generate force and speed of up to 3 MN and 90 km/h, because they are designed to handle high loads and reproduce car pulses. However, many applications - such as WHIPLASH-tests, child seat and roof rack tests and similar - require much lower speed and the test objects are more lightweight and quite compact and the pulse is given by an international standard. As made for significantly higher energies, classic systems perform like a sledgehammer cracking a nut and are hard to be controlled accurately at low-speed applications. MESSRINGs RIS compact impact simulator is an accelerator system specifically designed to handle the load level of low-speed and -weight applications but shows all features, capabilities and precision of a MESSRING sled or crash test facility.

     MESSRING Systembau MSG GmbH Robert-Stirling-Ring 1 82152 Krailling Germany

     MESSRING Systembau MSG GmbH created: GA, 09.11.07 Printing errors and omissions reserved revised: KO, 06.08.09

     For more information, please contact us: Phone: +49-89-898139-0, Fax: -924 Email: info@messring.de www.messring.de

     printed: 02.03.10; 1AG_A_VD_E.doc released: RW, 06.08.09

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     Introduction MESSRINGs successful SIS-test rig, the standard for simulating side impacts, was consequently streamlined to open the outstanding performance and the unparalleled operating comfort of a MESSRING test facility to a wide group of users. Especially whiplash-sled tests e.g. require a lot of preparation time and occupy the capacities of a crash or acceleration facility above average. With its very compact design the RIS can be located in nearly every industrial building without requiring any special foundation - even in aisle-type locations that initially have not been designed for test rigs - and replaces or completes even more complex and much more expensive existing accelerator or decelerator systems. Key features: Servo-hydraulic accelerator Non-destructive simulation of complex crash pulses High reproducibility High repeatability and test rates Allows rapid

    parameter variations between two tests Outstanding user software provides one-man operation Database-supported test preparation and evaluation Very low wear, high reliability Requires very little floor space Cost-efficient operation

     Figure 2: Compact Impact Simulator

     Working Principle

     Control PC




     Oil Pump Control Valve Oil

     Oil Accelerator Sled Damper

     Figure 3: Functional Diagram

     Printed: 02.03.2010


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     General The hydraulic sled consists of a sled platform, which is accelerated by means of a servovalve-controlled hydraulic piston. The sled is moving on a rail-track that is mounted on top of an appropriate industrial floor and stopped by a standard damper at the end of the track. The RIS can be used for simulating low speed vehicle tests, such as whiplash, baggage rack tests, bumper tests etc. and a whole range of different customer-specific low speed impact simulations. Scope Sled platform with M12 hole pattern 50mm x 100mm for attachment of test objects Track rails with linear guides High-dynamic, servo-hydraulic propulsion system energy chain for accelerometers, DAS-supply cabinet with control components control PC with WindowsXP and CrashSoft3 for test preparation, test execution and analysis The hydraulic gun accelerates the sled platform with on a maximum effective stroke of 800 mm. Up to 20 G can be achieved based on the total payload. The acceleration curve is freely programmable. The sled detaches from the piston and is braked with a industrial damper at the end of the test track.

     Figure 4: Side Impact Simulator (SIS) Test Rig

     Two models are available: A: optimized for WHIPLASH-tests and a maximum of 27 km/h B: optimized for child seat tests and a maximum speed of 50 km/h

     Printed: 02.03.2010 1AG_A_VD_E.doc

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     Examples Achieved with the RIS Compact Impact Simulator The below example shows a typical WHIPLASH-test performed on the RIS. We are pleased to give you a demonstration, just call or write us to schedule a visit.

     Acceleration/time diagram

     Speed/time diagram

     Position/time diagram

     Figure 5: Whiplash test with 16,09 km/h and a total payload of 168kg The red lines show the desired crash pulse. The blue or green lines show the crash pulse achieved by the Real Impact Simulator in the sled test.

     Figure 6: Whiplash test

     Technical Specifications

     Maximum speed Overall acceleration Maximum payload Maximum stroke Frequency Max jerk Sled platform Speed Acceleration Software Time between two tests Required floor space up to 50 km/h up to 20 G up to 250 kg 800 mm >140 Hz > 15 G/ms 1.8 mx 1.2 m (L x W ) 0.5 km/h 1 G RMS (CFC60 Hz 0-30 G) CrashSoft3 ?C RIS Workshop < 10 min 12 m x 2 m x 1 m (L x W x H)

     Printed: 02.03.2010



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