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Japan Test Programme Backset Measurement with R-point versus H-point method

Informal document No. GRSP-41-03 (41 st GRSP,7-11 May 2007,agenda item 3.1.1). Japan Test Programme Backset Measurement with R-point versus H-point method. April ‘ 07 JAPAN MLIT. Contents. 1. Purpose 2. Evaluation Conditions and Test Seat Specifications

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Japan Test Programme Backset Measurement with R-point versus H-point method

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  1. Informal document No.GRSP-41-03 (41st GRSP,7-11 May 2007,agenda item 3.1.1) Japan Test Programme Backset Measurement with R-point versus H-point method April‘07 JAPAN MLIT

  2. Contents 1. Purpose 2. Evaluation Conditions and Test Seat Specifications 3. Comparative Results of Backset Measurements 4. Conclusions

  3. HRMD Pivot point of HRMD : At (torso angle – 3 ) - ° At 505,5mm from SRP - Without Back Pan Design Seat Back Angle SRP 1. Purpose • To summarize the advantages and disadvantages of the following two proposed backset measurement methods, and determine suitable evaluation standards. • H-point Method: Backset is measured using a 3D manikin and a head restraint • measuring device (HRMD), with the seat back set at the • manufacturer’s design angle. • R-point Method: Backset is measured with an HRMD or equivalent device • initially aligned to the seating reference point (SRP), with the • seat back set at the manufacturer’s design angle. • (Note: The R-point is within±25 mm of the H-point.) H-point Method R-point Method HRMD Design Seat Back Angle H-Point

  4. 2. Evaluation Conditions ＊：Cited from 7th GTR Meeting，HR-7-10

  5. 2. Test Seat Specifications Cited from presentation material for7th GTR Meeting HR-7-10 Type Mi（b） Type Mi（a）

  6. 2. Test Seat Specifications Type N Type Ma Type Mi（c） Reactive head restraints Type S Type D

  7. 2. H-point Variability of Test Seats The H-points of the test seats were distributed in the forward and upward directions, within the specified tolerance (25 mm).

  8. 2. Torso Angle Variability of Test Seats Torso angle measurements were also within the specified tolerance (3°).

  9. 3. Comparative Results of Backset Measurements While values obtained with the R-point method were somewhat higher or lower for various seats, the R-point measurements were on average 6.7 mm lower. Max. Ave. Min. -6.7 Average

  10. X=Mean value of each seat S d C.V = 100 (%) =Standard deviation of each seat S d X X 3. Comparative Summary of Variability and Repeatability The R-point method yielded better coefficients of variation (CV) for variability and repeatability of measurements.

  11. 3.Patterns of Backset Values Three of the six non-active seats were compatible with the US-proposed H-point backset limit of 55 mm, with allowance for 3 variability. *1: Estimated from Mi(a) variability, due to insufficient number of measurements. *2： Determined as <80 for a reactive seat.

  12. 4. Conclusions • Measurement Method • The R-point method has higher repeatability. • 2.Difference between H-point and R-point measurements • While theoretically there should be no difference between the • average measurements, actual R-point measurements were • about 7 mm lower because of seat variability patterns. • 3.Feasibility of Desired Backset Value • The feasibility of the US-proposed“H-point backset limit of • 55 mm” is verified, based on the design seat back angle, • with allowances for production and measurement variations. • Equivalent R-point backset will be about 48 mm or less.

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