A passenger car has a weight of 4,520 lb and wheelbase of 9 feet and 2...
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A passenger car has a weight of 4,520 lb and wheelbase of 9 feet and 2 inches. The weight distribution on the front axle is 53.5%, and that on the rear axle is 46.5% under static condition. The cornering stiffness of each of the front tires is 8,750 lb/rad, and that of the rear tire is 8,600 lb /rad. If the car has an equal arm (parallel) independent front suspension and a conventional solid rear axle with leaf spring suspension. The front suspension has a roll stiffness, Kof, of 1,750 in-lb/deg. The rear leaf springs have a rate of 135 lb/in and a lateral separation of 45 inches. The sprung mass (suspensions) is 3,000 lb at a CG height 10 inches above the roll axis, (a) Determine whether the car is understeer or oversteer without taking into account the camber angle effect. (b) If a camber stiffness that is 12% of the cornering stiffness, estimate the understeer gradient due to camber effect. (c) If the car is cornering in a speed of 60 mph and a radius of 200 feet into a highway inlet, determine the steering angle required for the cornering and related roll angle of the car suspension. A passenger car has a weight of 4,520 lb and wheelbase of 9 feet and 2 inches. The weight distribution on the front axle is 53.5%, and that on the rear axle is 46.5% under static condition. The cornering stiffness of each of the front tires is 8,750 lb/rad, and that of the rear tire is 8,600 lb /rad. If the car has an equal arm (parallel) independent front suspension and a conventional solid rear axle with leaf spring suspension. The front suspension has a roll stiffness, Kof, of 1,750 in-lb/deg. The rear leaf springs have a rate of 135 lb/in and a lateral separation of 45 inches. The sprung mass (suspensions) is 3,000 lb at a CG height 10 inches above the roll axis, (a) Determine whether the car is understeer or oversteer without taking into account the camber angle effect. (b) If a camber stiffness that is 12% of the cornering stiffness, estimate the understeer gradient due to camber effect. (c) If the car is cornering in a speed of 60 mph and a radius of 200 feet into a highway inlet, determine the steering angle required for the cornering and related roll angle of the car suspension.
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