Measuring and testing – Simulated environment
Patent
1997-01-21
1999-03-02
Dombroske, George M.
Measuring and testing
Simulated environment
73862043, 73767, 73768, 364558, G01D 700, G01N 1700, G01B 716
Patent
active
058774360
ABSTRACT:
A method is provided for quantitative determination of the pressure comfort of a seat cushion. For this purpose, the sitting surface of the seat cushion to be tested is loaded mechanically in a manner that corresponds to a normal individual sitting in it, and the seat distribution is then determined with an interposed measuring mat. The signals from the individual pressure sensors of the measuring mat are summarized in accordance with anthropomorphically determined loading ranges with different pressure sensitivity thresholds groupwise and evaluated separately for the individual areas. For this purpose, the pressure measurement signals are multiplied by a factor or a pressure-dependent progressively increasing evaluation function and the product function is integrated. The pressure sensitivity threshold is assigned a value of 1. Depending on the difference between the respective pressure measurement value and the pressure sensitivity threshold (p.sub.0) the quality factor increases approximately parabolically or in geometric stages with increasing difference. The sum of the integral values obtained for the product functions is output as a rating number for the pressure comfort of the cushion. The comfort investigation can be performed with subjects of different sizes or seat testing punches of different sizes (5%, 50%, and 95% percentile), with an average or total value for all the results being used as a rating number for pressure comfort.
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Faust Eberhard
Pfahler Karl
Schmidt Helge
Dombroske George M.
Mercedes-Benz AG
Noori Max H.
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