Figure 4-1 Inertial loading - Sample calculation Given: Door system subjected to a 30g deceleration Average Push-Button Spring Output Force = 0.459kgf Pawl Spring Output Torque = 0.0459kgf m a = 30g (m/s2) F = ma = m*30g = m*294.2 M1 = 0.0163kg d1 = 31.50mm M2 = 0.0227kg d2 = 10.67mm M3 = 0.0122kg d3 = 4.83mm M4 = 0.0422kg d4 = 31.50mm d5 = 37.59mm d6 = 1.90mm denotes the cg of component F1 = M1 x a - Average load on knob spring = (0.0163kg x 30g) - 0.459kgf = 0.03kgf F2 = M2 x a = 0.0227kg x 30g = 0.681kgf F3 = M3/2 x a = 0.0122kg/2 x 30g = 0.183kgf Mo = F1 x d1 + F2 x d2 - F3 x d3 Σ = 0.03 x 31.5 + 0.681 x 10.67 - 0.183 x 4.83 = 7.33kgf mm F5 = Mo/d4 = 7.33/31.5 = 0.2328kgf F6 = M4 x a = 0.0422kg x 30g = 1.266kgf Mo = Pawl spring output torque- (F5 d5 + F6 d6)/1000 Σ = 0.0459 - (0.2328 x 37.59 + 1.266 x 1.9)/1000 = 0.0347kgf m Table 4-1 Acceleration pulse corridor Upper Bound Lower Bound Acceleration Acceleration Time (ms) Point Time (ms) (g) (g) A 0 6 E 5 0 B 20 36 F 25 30 C 60 36 G 55 30 D 100 0 H 70 0 Figure 4-2 Acceleration pulse Figure 4-3 Vehicle coordinate reference system for inertial testing
Figure 4-1 Inertial loading - Sample calculation Given: Door system subjected to a 30g deceleration Average Push-Button Spring Output Force = 0.459kgf Pawl Spring Output Torque = 0.0459kgf m a = 30g (m/s2) F = ma = m*30g = m*294.2 M1 = 0.0163kg M2 = 0.0227kg M3 = 0.0122kg M4 = 0.0422kg d1 = 31.50mm d2 = 10.67mm d3 = 4.83mm d4 = 31.50mm d5 = 37.59mm d6 = 1.90mm denotes the cg of component F1 = M1 x a - Average load on knob spring = (0.0163kg x 30g) - 0.459kgf = 0.03kgf F2 = M2 x a = 0.0227kg x 30g = 0.681kgf F3 = M3/2 x a = 0.0122kg/2 x 30g = 0.183kgf Σ Mo = F1 x d1 + F2 x d2 - F3 x d3 = 0.03 x 31.5 + 0.681 x 10.67 - 0.183 x 4.83 = 7.33kgf mm F5 = Mo/d4 = 7.33/31.5 = 0.2328kgf F6 = M4 x a = 0.0422kg x 30g = 1.266kgf Σ Mo = Pawl spring output torque- (F5 d5 + F6 d6)/1000 = 0.0459 - (0.2328 x 37.59 + 1.266 x 1.9)/1000 = 0.0347kgf m Table 4-1 Acceleration pulse corridor Upper Bound Lower Bound Time (ms) Acceleration (g) Point Time (ms) Acceleration (g) A 0 6 E 5 0 B 20 36 F 25 30 C 60 36 G 55 30 D 100 0 H 70 0 Figure 4-2 Acceleration pulse Figure 4-3 Vehicle coordinate reference system for inertial testing
R011r3e.docx