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Japan's Comment on GRSP/2005/6 ECE-R.44 GRSP/2005/5 ECE-R.16

1/16. Informal Document No. GRSP-37-10 37 th GRSP 23th- 27th May Agenda Item B1.7. Japan's Comment on GRSP/2005/6 ECE-R.44 GRSP/2005/5 ECE-R.16. 2/16. Types of Acceleration Sled Test Devices. Pneumatic type (HYGE). Test device. Hydraulic type. Complex waveform conditions. Easy.

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Japan's Comment on GRSP/2005/6 ECE-R.44 GRSP/2005/5 ECE-R.16

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  1. 1/16 Informal Document No. GRSP-37-10 37th GRSP 23th- 27th May Agenda Item B1.7. Japan's Comment on GRSP/2005/6 ECE-R.44 GRSP/2005/5 ECE-R.16

  2. 2/16 Types of Acceleration Sled Test Devices Pneumatic type (HYGE) Test device Hydraulic type Complex waveform conditions Easy Difficult Yes No Waveform vibration in GT curve Good Allowable Reproducibility Some labs in Europe Most labs in Japan Remarks

  3. 3/16 TEST SAMPLE SLED COMPRESSED AIR N2 GAS WATER BLOW F.M. WATER ￥ METERING PIN WATER L.P. RAIL H.P. PVC H.P. N N N N N N 2 2 2 2 2 2 Acceleration Sleds Used in Japan  Pneumatic sled test devices (HYGE)are mostly used

  4. 4/16 WATER BLOW F.M. L.P. H.P. PVC H.P. N N N N N N 2 2 2 2 2 2 Acceleration Sleds Used in Japan  Pneumatic sled test devices (HYGE) are mostly used

  5. 5/16 Requirements for Acceleration Sleds [R.44 GRSP/2005/6] A: Acceleration curve within the corridor B: V = 50 +2/0 (km/h) C: Initial slope of acceleration 10ms-5G & 20ms-9G D: Acceleration distance 49 +1/0km/h = 65050 (mm)

  6. 6/16 R.44 Test Results ACCG Time ms

  7. 7/16 R.44 Test Results No test devices in Japan meet all requirements

  8. 8/16 Requirements for Acceleration Sleds [R.16 GRSP/2005/5] A: Acceleration curve within the corridor B: V = 51 +2/0 (km/h) C: Initial slope of acceleration 5ms-10G & 10ms-20G D: Acceleration distance 50 +1/0km/h = 405 (cm)

  9. 9/16 R.16 Test Results

  10. 10/16 R.16 Test Results No test devices in Japan meet all requirements

  11. 11/16 Is the Acceleration Distance Necessary? For deceleration sleds, the stopping distance is specified to ensure the consistency of test conditions. For acceleration sleds, however, the same level of consistency can be achieved by specifying requirements on initial slope of acceleration

  12. 12/16 V Vel D How to Obtain the Acceleration Distance Deceleration device Acceleration device V’ 49 D2 Vel D1 D= Vdt D1= V’dt

  13. 13/16 Japan’s View (R.44) • the acceleration distance provision for acceleration sleds should be deleted. • Regarding the initial slope requirement, European labs’ measurement results by deceleration sleds should be studied before finalizing the requirement

  14. 14/16 Japan’s View (R.16) • The acceleration distance provision for acceleration sleds should be deleted. • It is very difficult to meet all the requirements of GRSP/2005/5 simultaneously with acceleration devices in Japan. Especially, the proposed values [5ms-10G,10ms-20G] for the sled acceleration initial slope requirement are not feasible with acceleration devices in Japan. If the values are replaced by more feasible ones on the basis of European lab’s measurement results by deceleration sleds and as a result, new values are feasible with acceleration sleds (ex. 7.5ms-10G and 12.5 ms-0G), Japan would accept them

  15. 15/16 Japan’s View (R.16)

  16. 16/16 Conclusion • the acceleration distance provision for acceleration sleds should be deleted • the initial slope requirement should be finalized in consideration of European labs’ measurement results. Especially for R16 special attention should be given from the viewpoint of feasibility to the values.

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