Therefore 52 kgm 3 foam is chosen to be shared for

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Therefore, 52 kg/m 3 foam is chosen to be shared for product A and B to reach the design objective. 200 220 240 260 280 0 0.2 0.4 0.6 0.8 1 1.2 M (kg) G (g) B C A Utopia Point Fig. 3 Optimum design results of product A and B with same foam density The design components of product A and B with sharing foam density and their demand change are shown in Table 3. From the slope change in Fig. 3 and the demand change in Table 3 we can see that for product A, the mass M decrease rate is faster than head impact acceleration change rate G. From the demand function, the reduce of mass will increase the demand value. 34