The sprung parts of a vehicle weigh 9.79 KN, its center of gravity is 106.7 cm...
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The sprung parts of a vehicle weigh 9.79 KN, its center of gravity is 106.7 cm behind the front axle, and the wheelbase is 228.6 cm. The combined stiffness of the springs of the front suspension is 24.52 kN/m and that of the rear suspension is 26.27 kN/m. The radius of gyration of the sprung parts about a horizontal transverse axis through the center of gravity is 102.6 cm (40.4 in.). 1. Calculate the natural frequencies of the pitch and bounce motions of the vehicle body. 2. Determine the locations of the oscillation centers. 3. Determine the parameters of the front and rear quarter car models. 4. Calculate body bounce and wheel hop frequencies for the quarter car models. 5. What should be the front and rear damping constants so as to have a damping ratio of 0.3 for the quarter car models? 6. Determine the parameters of the roll and bounce half car model. 7. Calculate body bounce and roll frequencies based on the roll and bounce half car model 8. Estimate static suspension deflections (at the front and at the rear) if four people are to be seated in the vehicle. 9. Derive a 1/8 vehicle model and obtain the transfer function from road vertical speed to sprung acceleration. The sprung parts of a vehicle weigh 9.79 KN, its center of gravity is 106.7 cm behind the front axle, and the wheelbase is 228.6 cm. The combined stiffness of the springs of the front suspension is 24.52 kN/m and that of the rear suspension is 26.27 kN/m. The radius of gyration of the sprung parts about a horizontal transverse axis through the center of gravity is 102.6 cm (40.4 in.). 1. Calculate the natural frequencies of the pitch and bounce motions of the vehicle body. 2. Determine the locations of the oscillation centers. 3. Determine the parameters of the front and rear quarter car models. 4. Calculate body bounce and wheel hop frequencies for the quarter car models. 5. What should be the front and rear damping constants so as to have a damping ratio of 0.3 for the quarter car models? 6. Determine the parameters of the roll and bounce half car model. 7. Calculate body bounce and roll frequencies based on the roll and bounce half car model 8. Estimate static suspension deflections (at the front and at the rear) if four people are to be seated in the vehicle. 9. Derive a 1/8 vehicle model and obtain the transfer function from road vertical speed to sprung acceleration.
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Lets calculate the values using the given data Weight of sprung parts 979 kN 9790 N Center of gravity 1067 cm 1067 m Wheelbase 2286 cm 2286 m Combined ... View the full answer
Related Book For
Physics
ISBN: 9781119539636
11th Edition
Authors: John D. Cutnell, Kenneth W. Johnson, David Young, Shane Stadler
Posted Date:
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