17. Under static or constant velocity conditions, the wheelchair will tip back- wards if the vertical projection of the combined center of gravity (CG) of the wheelchair and occupant falls behind the point of contact between the rear wheels and the ramp surfaces. As shown in Figure 5.12, the rearward tipover angle (0,) is determined by the horizontal distance (d₁) and the vertical distance (d₂) between CG and the wheelchair's rear axles. a) Using static analysis, derive the equation relating 0,, d₁, and d2. b) Using the platform approach depicted in Figure 5.7, suggest a method for determining d₁. c) Assuming that d₁ and d2 averaged 13 cm and 24 cm, respectively, for able-bodied individuals, what would 0, be? d) How would d₁ and d₂ change if the wheelchair occupant leaned forward instead of sitting back against the chair? How would 0, be affected by this postural shift? CG 0₁ kost 30.5cm

17. Under static or constant velocity conditions, the wheelchair will tip back- wards if the vertical projection of the combined center of gravity (CG) of the wheelchair and occupant falls behind the point of contact between the rear wheels and the ramp surfaces. As shown in Figure 5.12, the rearward tipover angle (0,) is determined by the horizontal distance (d₁) and the vertical distance (d₂) between CG and the wheelchair's rear axles. a) Using static analysis, derive the equation relating 0,, d₁, and d2. b) Using the platform approach depicted in Figure 5.7, suggest a method for determining d₁. c) Assuming that d₁ and d2 averaged 13 cm and 24 cm, respectively, for able-bodied individuals, what would 0, be? d) How would d₁ and d₂ change if the wheelchair occupant leaned forward instead of sitting back against the chair? How would 0, be affected by this postural shift? CG 0₁ kost 30.5cm

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter4: Coplanar Equilibrium Analysis

Section: Chapter Questions

Problem 4.41P: The center of gravity of the 3000-lb car is at G. The car is parked on an incline with the parking...

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